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Manuscript submitted July 14, 2008; accepted May 26, 2009.<br />

Correspondence to: Mark A. Mar<strong>in</strong>ella, MD, FACP, Dayton<br />

Physicians, LLC, 1382 east Stroop road, Dayton, OH<br />

45429; telephone: 937-293-4383; fax: 937-293-4365; e-mail:<br />

Mmar<strong>in</strong>ella@pol.net<br />

J Support Oncol 2009;7:122–127, 130 © 2009 Elsevier Inc. All rights reserved.<br />

review<br />

<strong>Diagnosis</strong> <strong>and</strong> <strong>Management</strong> <strong>of</strong> <strong>Hiccups</strong><br />

<strong>in</strong> <strong>the</strong> <strong>Patient</strong> with Advanced Cancer<br />

Mark A. Mar<strong>in</strong>ella, MD, FACP<br />

C<br />

ancer patients experience a variety <strong>of</strong><br />

disease- <strong>and</strong> treatment-related respiratory<br />

complications that can significantly<br />

impair quality <strong>of</strong> life. Some <strong>of</strong><br />

<strong>the</strong> most common <strong>of</strong> <strong>the</strong>se complications encountered<br />

<strong>in</strong> cl<strong>in</strong>ical practice <strong>in</strong>clude cough,<br />

hemoptysis, dyspnea, airway obstruction, aspiration<br />

syndromes, thromboembolic disease, <strong>in</strong>fection,<br />

<strong>and</strong> hiccups. 1<br />

Severe hiccups are responsible for approximately<br />

4,000 annual hospitalizations <strong>in</strong> <strong>the</strong> United<br />

States. 2 However, <strong>the</strong> <strong>in</strong>cidence <strong>of</strong> prolonged<br />

hiccups <strong>in</strong> <strong>the</strong> oncology population is unclear,<br />

<strong>and</strong> may be underreported due to <strong>the</strong> presence<br />

<strong>of</strong> o<strong>the</strong>r press<strong>in</strong>g comorbid complications that<br />

commonly occur <strong>in</strong> <strong>the</strong> palliative <strong>and</strong> hospice<br />

sett<strong>in</strong>gs. The typical cancer patient has many<br />

<strong>and</strong> <strong>of</strong>ten simultaneous risk factors for develop<strong>in</strong>g<br />

hiccups, so cl<strong>in</strong>icians provid<strong>in</strong>g adjuvant<br />

or palliative care should be familiar with <strong>the</strong><br />

pathophysiology, etiologies, <strong>and</strong> management <strong>of</strong><br />

this potentially debilitat<strong>in</strong>g complication.<br />

Def<strong>in</strong>ition<br />

<strong>Hiccups</strong> occur when an abrupt, <strong>in</strong>voluntary<br />

spasm <strong>of</strong> <strong>the</strong> diaphragm <strong>and</strong> <strong>in</strong>tercostal muscles<br />

is followed by sudden closure <strong>of</strong> <strong>the</strong> glottis, generat<strong>in</strong>g<br />

<strong>the</strong> characteristic onomatopoeic “hic”<br />

sound. 3–6 The medical term for hiccups, s<strong>in</strong>gultus,<br />

is <strong>of</strong> Lat<strong>in</strong> orig<strong>in</strong> <strong>and</strong> means to gasp or sigh. 7<br />

<strong>Hiccups</strong> were first attributed to phrenic nerve<br />

irritation by Shortt <strong>in</strong> 1833. 8 Cl<strong>in</strong>ically, most<br />

hiccup episodes are benign, <strong>of</strong> acute onset, <strong>and</strong><br />

self-limited, typically ceas<strong>in</strong>g with<strong>in</strong> m<strong>in</strong>utes. 6<br />

However, persistent <strong>and</strong> <strong>in</strong>tractable hiccups are<br />

def<strong>in</strong>ed as last<strong>in</strong>g for more than 48 hours or 1<br />

month, respectively. 6,9<br />

Abstract Benign, self-limited hiccups are more <strong>of</strong> a nuisance, but persistent<br />

<strong>and</strong> <strong>in</strong>tractable hiccups last<strong>in</strong>g more than 48 hours <strong>and</strong> 1 month,<br />

respectively, are a source <strong>of</strong> significant morbidity <strong>in</strong> <strong>the</strong> patient with advanced<br />

malignancy. The hiccup reflex is complex, but stimulation <strong>of</strong> vagal<br />

afferents followed by activation <strong>of</strong> efferent phrenic <strong>and</strong> <strong>in</strong>tercostal nerve<br />

pathways results <strong>in</strong> contraction <strong>of</strong> <strong>the</strong> diaphragm <strong>and</strong> <strong>in</strong>tercostal muscles,<br />

respectively. The etiology <strong>of</strong> hiccups <strong>in</strong> <strong>the</strong> cancer <strong>and</strong> palliative care population<br />

may <strong>in</strong>clude chemo<strong>the</strong>rapy, electrolyte derangements, esophagitis,<br />

<strong>and</strong> neoplastic <strong>in</strong>volvement <strong>of</strong> <strong>the</strong> central nervous system (CNS), thorax,<br />

<strong>and</strong> abdom<strong>in</strong>al cavity. Prolonged hiccups can result <strong>in</strong> depression, fatigue,<br />

impaired sleep, dehydration, weight loss, malnutrition, <strong>and</strong> aspiration syndromes.<br />

Evaluation should be symptom-directed, focus<strong>in</strong>g ma<strong>in</strong>ly upon<br />

<strong>the</strong> CNS <strong>and</strong> thoracoabdom<strong>in</strong>al cavities as well as assessment <strong>of</strong> medications<br />

<strong>and</strong> serum chemistries. Most patients with ongo<strong>in</strong>g hiccups require<br />

pharmaco<strong>the</strong>rapy, with chlorpromaz<strong>in</strong>e be<strong>in</strong>g <strong>the</strong> only US Food <strong>and</strong> Drug<br />

Adm<strong>in</strong>istration-approved agent. However, numerous o<strong>the</strong>r medications<br />

have been reported to be efficacious for treat<strong>in</strong>g <strong>in</strong>tractable hiccups.<br />

Gabapent<strong>in</strong> has recently been shown to term<strong>in</strong>ate hiccups effecitvely <strong>in</strong><br />

cancer patients <strong>and</strong> may emerge as a <strong>the</strong>rapy <strong>of</strong> choice <strong>in</strong> <strong>the</strong> palliative<br />

sett<strong>in</strong>g due to favorable tolerability, pa<strong>in</strong>-modulat<strong>in</strong>g effects, m<strong>in</strong>imal adverse<br />

events, <strong>and</strong> lack <strong>of</strong> drug <strong>in</strong>teractions.<br />

Pathophysiology<br />

The pathogenesis <strong>of</strong> hiccups is complex <strong>and</strong> not<br />

fully understood but is generally mediated from a<br />

variety <strong>of</strong> etiologies with similar neurophysiologic<br />

mechanisms result<strong>in</strong>g <strong>in</strong> diaphragmatic contraction<br />

<strong>and</strong> spasm. 1,2 <strong>in</strong>terest<strong>in</strong>gly, hiccup episodes<br />

<strong>in</strong>volve unilateral contraction <strong>of</strong> <strong>the</strong> left hemidiaphragm<br />

<strong>in</strong> approximately 80% <strong>of</strong> cases. 9,10 The<br />

frequency <strong>of</strong> hiccups ranges from 4–60/m<strong>in</strong>ute,<br />

with little <strong>in</strong>tra<strong>in</strong>dividual variability. 10,11 There is<br />

no clear physiologic purpose <strong>of</strong> hiccups, although<br />

this rema<strong>in</strong>s debated.<br />

The hiccup-reflex arc is composed <strong>of</strong> afferent<br />

<strong>and</strong> efferent limbs <strong>and</strong> a central hiccup center. 6,12–14<br />

The afferent pathway consists <strong>of</strong> <strong>the</strong> vagus nerve<br />

(cranial nerve X), <strong>the</strong> phrenic nerve (derived<br />

from cervical segments C2–C4), <strong>and</strong> <strong>the</strong> sympa<strong>the</strong>tic<br />

cha<strong>in</strong> (derived from thoracic segments T6–<br />

T12). 14 The sympa<strong>the</strong>tic nervous system may play<br />

Dr. Mar<strong>in</strong>ella is a<br />

practic<strong>in</strong>g medical<br />

oncologist, Hematology-<br />

<strong>Oncology</strong> <strong>of</strong> Dayton,<br />

<strong>and</strong> Assistant Cl<strong>in</strong>ical<br />

Pr<strong>of</strong>essor, Department<br />

<strong>of</strong> <strong>in</strong>ternal Medic<strong>in</strong>e,<br />

wright State University<br />

School <strong>of</strong> Medic<strong>in</strong>e,<br />

Dayton, Ohio.<br />

122 www.Supportive<strong>Oncology</strong>.net Th e Jo u r n a l o f Su p p o rT i v e on c o l o g y


some role <strong>in</strong> <strong>the</strong> generation <strong>and</strong>/or propogation <strong>of</strong> hiccups, as<br />

<strong>the</strong>y cease after adm<strong>in</strong>istration <strong>of</strong> <strong>the</strong> beta-receptor antagonist<br />

carvedilol. 15 The vagus nerve, <strong>in</strong> particular, can be activated <strong>in</strong><br />

various anatomic areas (thoracic <strong>and</strong> abdom<strong>in</strong>al viscera as well<br />

as with<strong>in</strong> head <strong>and</strong> neck structures). For <strong>in</strong>stance, irritation<br />

<strong>of</strong> <strong>the</strong> auricular branch <strong>of</strong> <strong>the</strong> vagus nerve (Arnold’s nerve),<br />

which <strong>in</strong>nervates <strong>the</strong> auditory canal, by cerumen, foreign bodies,<br />

bugs, <strong>and</strong> even hair, has resulted <strong>in</strong> hiccups. 16<br />

CNS areas such as <strong>the</strong> bra<strong>in</strong>stem respiratory center, <strong>the</strong><br />

reticular activat<strong>in</strong>g system (rAS) <strong>in</strong> <strong>the</strong> medulla oblongata,<br />

<strong>the</strong> hypothalamus, <strong>and</strong> temporal lobes are also <strong>in</strong>volved <strong>in</strong> <strong>the</strong><br />

pathogenesis <strong>of</strong> hiccups, although <strong>the</strong>ir precise contributions<br />

rema<strong>in</strong> to be elucidated. 6,17 release <strong>of</strong> 5-hydroxytryptam<strong>in</strong>e<br />

from gut enterochromaff<strong>in</strong> cells <strong>and</strong> enteric vagal afferents<br />

follow<strong>in</strong>g adm<strong>in</strong>istration <strong>of</strong> various chemo<strong>the</strong>rapeutic agents<br />

(especially cisplat<strong>in</strong>um) may lead to hiccups. 18<br />

An additional mechanism <strong>of</strong> stimulat<strong>in</strong>g <strong>the</strong> hiccup arc is<br />

via stimulation <strong>of</strong> <strong>the</strong> ch<strong>in</strong> <strong>in</strong>tegument. Stimulation <strong>of</strong> <strong>the</strong> ch<strong>in</strong><br />

via shav<strong>in</strong>g produced transient hiccups <strong>in</strong> two patients. 16 The<br />

authors postulated that sensory afferents to <strong>the</strong> sp<strong>in</strong>al tract <strong>of</strong><br />

<strong>the</strong> trigem<strong>in</strong>al nerve project to <strong>the</strong> rAS, which subsequently<br />

recruits activation <strong>of</strong> <strong>the</strong> phrenic nerve nucleus lead<strong>in</strong>g to<br />

stimulation <strong>of</strong> <strong>the</strong> efferent hiccup arc. 16 <strong>in</strong> <strong>the</strong>se patients, <strong>the</strong><br />

hiccups disappeared after anes<strong>the</strong>tiz<strong>in</strong>g <strong>the</strong> mental nerve, suggest<strong>in</strong>g<br />

that <strong>the</strong> trigem<strong>in</strong>al nerve plays a role <strong>in</strong> <strong>the</strong> hiccup<br />

mechanism.<br />

The efferent pathway <strong>of</strong> <strong>the</strong> hiccup arc primarily consists<br />

<strong>of</strong> <strong>the</strong> phrenic nerve, <strong>the</strong> primary motor <strong>in</strong>put to <strong>the</strong><br />

diaphragm. 6,13,14 Additionally, <strong>the</strong> external <strong>in</strong>tercostal (derived<br />

from segments T1–T11) <strong>and</strong> <strong>the</strong> scalenus anticus nerves<br />

stimulate contraction <strong>of</strong> <strong>the</strong> <strong>in</strong>tercostal <strong>and</strong> scalene muscles,<br />

respectively. 1–6 Shortly after activation <strong>of</strong> <strong>the</strong> hiccup arc, <strong>the</strong><br />

recurrent laryngeal nerve stimulates closure <strong>of</strong> <strong>the</strong> glottis, result<strong>in</strong>g<br />

<strong>in</strong> <strong>the</strong> characteristic “hic” sound. 2<br />

Significant acute negative <strong>in</strong>trathoracic pressure may occur,<br />

result<strong>in</strong>g as hypotension, bradycardia, pneumomediast<strong>in</strong>um,<br />

<strong>and</strong> subcutaneous emphysema. 6,19 Ma<strong>the</strong>w 20 studied <strong>the</strong> effects<br />

<strong>of</strong> neonatal hiccups on systemic arterial pressure <strong>and</strong> noted<br />

acute, transient decl<strong>in</strong>es <strong>in</strong> systolic pressures that were attributed<br />

to decreased stroke volume <strong>and</strong> vascular resistance. This<br />

decl<strong>in</strong>e <strong>in</strong> vascular resistance appears to result from <strong>in</strong>creased<br />

dilation <strong>and</strong> volume <strong>of</strong> <strong>the</strong> thoracic aorta <strong>in</strong>duced by decreases<br />

<strong>in</strong> hiccup-associated <strong>in</strong>trathoracic pressure. 20 whe<strong>the</strong>r hiccupassociated<br />

systolic hypotension is deleterious to cardiovascular<br />

function <strong>in</strong> adults is unclear, but it rema<strong>in</strong>s a plausible etiology<br />

<strong>of</strong> pathologic hemodynamic changes <strong>in</strong> those patients with underly<strong>in</strong>g<br />

heart disease.<br />

<strong>Hiccups</strong> <strong>of</strong>ten follow acute gastric distention <strong>in</strong> such situations<br />

as endoscopy, rapid <strong>in</strong>gestion <strong>of</strong> food or carbonated beverages,<br />

gastric outlet obstruction, or small bowel obstruction—<br />

all <strong>of</strong> which are believed to stimulate gastric vagal afferent<br />

activity. 2,3,6 Gluck <strong>and</strong> Pop 21 reproducibly demonstrated <strong>the</strong><br />

<strong>in</strong>duction <strong>of</strong> acid-<strong>in</strong>duced hiccups via esophageal acid perfusion<br />

<strong>in</strong> a patient with chronic hiccups. Additionally, esophageal<br />

distention has been implicated to cause hiccups via stimulation<br />

<strong>of</strong> mechanoreceptors <strong>and</strong> is <strong>the</strong> presumed pathogenic<br />

Table 1<br />

Etiologies <strong>of</strong> <strong>Hiccups</strong> <strong>in</strong> <strong>the</strong> <strong>Patient</strong> with Cancer<br />

Malignancy<br />

Esophagogastric cancer<br />

Colon cancer<br />

Hepatoma<br />

Leukemia<br />

Lung cancer<br />

Lymphoma<br />

Pancreatic cancer<br />

Renal cancer<br />

Liver metastasis<br />

Metabolic Derangements<br />

Hyponatremia, hypokalemia, hypocalcemia<br />

Renal failure<br />

Uremia<br />

Uncontrolled diabetes mellitus<br />

Hypoadrenalism<br />

CNS Pathology<br />

Bra<strong>in</strong> tumors (eg, gliomas, metastatic tumors)<br />

Stroke<br />

Hematoma/cerebral hemorrhage<br />

Encephalitis/men<strong>in</strong>gitis<br />

Bra<strong>in</strong> abscess/toxoplasmosis<br />

Cardiovascular Disorders<br />

Myocardial ischemia/<strong>in</strong>farction<br />

Pericardial effusion/pericarditis<br />

Thoracic/Pulmonary Disorders<br />

Pneumonia<br />

Pleural effusion/pleuritis<br />

Thoracic herpes zoster<br />

Mechanical ventilation<br />

Gastro<strong>in</strong>test<strong>in</strong>al Disorders<br />

Erosive esophagitis<br />

Infectious esophagitis (eg, herpes simplex, C<strong>and</strong>ida species)<br />

Peptic ulcer disease<br />

Gastric distention from food, liquid, air, endoscopy<br />

Gastric outlet or small bowel obstruction<br />

Pancreatitis<br />

Ascites<br />

Cholecystitis<br />

Subdiaphragmatic abscess<br />

Surgical Procedures/General Anes<strong>the</strong>sia<br />

Epidural Injections with Local Anes<strong>the</strong>tics<br />

Psychogenic<br />

vo l u m e 7, nu m b e r 4 ■ Ju ly/au g u S T 2009 www.Supportive<strong>Oncology</strong>.net<br />

Mar<strong>in</strong>ella<br />

cause <strong>of</strong> hiccups associated with achalasia, esophageal tumors,<br />

strictures, <strong>and</strong> food impaction. 2–6,21 <strong>in</strong>deed, Fass et al 22 <strong>in</strong>duced<br />

acute, transient hiccups <strong>in</strong> 40% <strong>of</strong> healthy subjects with <strong>in</strong>flation<br />

<strong>of</strong> proximal esophageal balloons. <strong>in</strong>terest<strong>in</strong>gly, all <strong>of</strong> <strong>the</strong><br />

patients <strong>in</strong> this study who developed hiccups were men. 22 This<br />

f<strong>in</strong>d<strong>in</strong>g is <strong>in</strong> keep<strong>in</strong>g with recent studies reveal<strong>in</strong>g a significant<br />

male predom<strong>in</strong>ance <strong>of</strong> hiccups <strong>in</strong> patients receiv<strong>in</strong>g cytotoxic<br />

chemo<strong>the</strong>rapy. 18,23 The mechanisms for male predom<strong>in</strong>ance <strong>of</strong><br />

hiccups <strong>in</strong> <strong>the</strong>se studies are not expla<strong>in</strong>ed. Because a variety<br />

<strong>of</strong> processes can result <strong>in</strong> hiccups, it rema<strong>in</strong>s most likely that<br />

123


Advanced Cancer: <strong>Diagnosis</strong> <strong>and</strong> <strong>Management</strong> <strong>of</strong> <strong>Hiccups</strong><br />

Table 2<br />

Causes <strong>of</strong> Drug-<strong>in</strong>duced <strong>Hiccups</strong><br />

Utilized <strong>in</strong> Cancer Care<br />

Antibiotics<br />

Benzodiazep<strong>in</strong>es<br />

Corticosteroids (especially dexamethasone)<br />

Anabolic steroids<br />

Perphenaz<strong>in</strong>e<br />

General <strong>in</strong>halational anes<strong>the</strong>sia<br />

Opioids<br />

Chemo<strong>the</strong>rapeutic agents (significant male predom<strong>in</strong>ance)<br />

Cisplat<strong>in</strong>um<br />

Carboplat<strong>in</strong><br />

Cyclophosphamide<br />

Docetaxel<br />

Etoposide<br />

Gemcitab<strong>in</strong>e<br />

Ir<strong>in</strong>otecan<br />

Paclitaxel<br />

V<strong>in</strong>des<strong>in</strong>e<br />

V<strong>in</strong>orelb<strong>in</strong>e<br />

stimulation <strong>of</strong> <strong>the</strong> vagus or phrenic nerves, diaphragm, head<br />

<strong>and</strong> neck structures, or CNS areas by anatomic lesions; metabolic<br />

derangements; or drugs <strong>in</strong>duce hiccups through complex<br />

neural mechanisms that cont<strong>in</strong>ue to be elucidated.<br />

Etiologies <strong>of</strong> <strong>Hiccups</strong> <strong>in</strong> <strong>Patient</strong>s with Cancer<br />

Perhaps more than any patient population <strong>in</strong> medic<strong>in</strong>e,<br />

those with malignancy represent some <strong>of</strong> <strong>the</strong> most medically<br />

complex situations due not only to cancer <strong>and</strong> metastasis but<br />

also to unrelated comorbidities; supportive pharmacologic<br />

treatments; <strong>in</strong>fectious complications; <strong>and</strong> anticancer <strong>the</strong>rapies<br />

such as chemo<strong>the</strong>rapy, radio<strong>the</strong>rapy, <strong>and</strong> surgery. As such,<br />

many potential mechanisms for <strong>in</strong>duction <strong>of</strong> <strong>the</strong> hiccup reflex<br />

exist, with many patients possess<strong>in</strong>g several factors, <strong>of</strong>ten mak<strong>in</strong>g<br />

it difficult to p<strong>in</strong>po<strong>in</strong>t <strong>the</strong> exact etiology.<br />

Tables 1 <strong>and</strong> 2 display some <strong>of</strong> <strong>the</strong> most commonly reported<br />

causes <strong>of</strong> hiccups <strong>in</strong> <strong>the</strong> cancer population. Overall, pathology<br />

<strong>of</strong> <strong>the</strong> gastro<strong>in</strong>test<strong>in</strong>al tract, thoracic viscera, <strong>and</strong> CNS is<br />

among <strong>the</strong> most common etiologies <strong>of</strong> persistent <strong>and</strong> <strong>in</strong>tractable<br />

hiccups. 2,5,6 For <strong>in</strong>stance, erosive or <strong>in</strong>fectious esophagitis<br />

is common <strong>in</strong> <strong>the</strong> cancer <strong>and</strong> palliative care sett<strong>in</strong>g, as is gastric<br />

distention result<strong>in</strong>g from malignant gastric outlet <strong>and</strong> small<br />

bowel obstruction. 24–26 <strong>in</strong> addition, pneumonia, malignant<br />

pleural effusion, empyema, <strong>and</strong> chest wall zoster may <strong>in</strong>voke<br />

<strong>the</strong> afferent hiccup arc <strong>and</strong> lead to s<strong>in</strong>gultus. 1,6,8,27<br />

Stimulation <strong>of</strong> various CNS centers <strong>in</strong>volved with <strong>the</strong><br />

physiology <strong>of</strong> hiccups by primary or metastatic bra<strong>in</strong> tumors,<br />

stroke, cerebral hemorrhage, abscess, men<strong>in</strong>goencephalitis,<br />

or malignant hydrocephalus may also be etiologic. 28–33 various<br />

metabolic derangements, most commonly hyponatremia, may<br />

<strong>in</strong>duce <strong>the</strong> hiccup reflex. 34,35 Hypoadrenalism has been reported<br />

to result <strong>in</strong> hiccups. 36 Myocardial <strong>in</strong>farction is a well-described<br />

precipitant <strong>of</strong> hiccups <strong>and</strong> likely results from ischemic<br />

activation <strong>of</strong> vagal pathways. 37 Thoracic, abdom<strong>in</strong>al, or pelvic<br />

tumors <strong>in</strong>vad<strong>in</strong>g <strong>the</strong> diaphragm or vagus nerve may stimulate<br />

hiccups .2–6,38,39<br />

Drug-<strong>in</strong>duced causes are protean, with benzodiazep<strong>in</strong>es,<br />

corticosteroids, antibiotics, opioids, <strong>and</strong> cytotoxic agents<br />

among <strong>the</strong> most common <strong>in</strong> patients with cancer. A more extensive<br />

list<strong>in</strong>g can be found <strong>in</strong> Table 2. 40–49 A study by Takiguchi<br />

et al 23 showed a significant male predom<strong>in</strong>ance <strong>of</strong> hiccups<br />

follow<strong>in</strong>g cytotoxic chemo<strong>the</strong>rapy.<br />

<strong>Patient</strong> Evaluation<br />

Acute, self-limited hiccups <strong>of</strong> less than 48 hours’ duration<br />

typically do not require exhaustive evaluation. Persistent <strong>and</strong><br />

<strong>in</strong>tractable hiccups without obvious explanation, such as those<br />

precipitated by a drug, usually require a diagnostic evaluation to<br />

exclude potentially treatable or life-threaten<strong>in</strong>g precipitants.<br />

A meticulous physical exam<strong>in</strong>ation with attention to head<br />

<strong>and</strong> neck structures, heart, lungs, chest wall, sk<strong>in</strong>, abdomen,<br />

<strong>and</strong> CNS should be performed. The external auditory canals<br />

should be exam<strong>in</strong>ed to exclude <strong>in</strong>flammation, foreign bodies,<br />

hairs, or impacted cerumen. 16,50 Careful neurologic exam<strong>in</strong>ation<br />

with attention to dysfunction <strong>of</strong> each <strong>of</strong> <strong>the</strong> hiccupproduc<strong>in</strong>g<br />

areas (eg, afferent limb, CNS structures, <strong>and</strong> efferent<br />

limb) should be performed. 2 if cancer is suspected, a search<br />

for lymphadenopathy or mass lesions is essential.<br />

Site-directed imag<strong>in</strong>g studies such as chest radiography,<br />

abdom<strong>in</strong>al radiography, CT, or Mri should be obta<strong>in</strong>ed if any<br />

element <strong>of</strong> <strong>the</strong> history or physical exam<strong>in</strong>ation suggests an etiology<br />

affect<strong>in</strong>g a particular organ system. examples could <strong>in</strong>clude<br />

pneumonia, ileus or bowel obstruction, bra<strong>in</strong> metastasis,<br />

or <strong>in</strong>tra-abdom<strong>in</strong>al malignancy. <strong>in</strong> patients with odynophagia<br />

or dysphagia, upper endoscopy should be performed to detect<br />

erosive or <strong>in</strong>fectious esophagitis, stricture, or malignancy. 26<br />

electrocardiography should be obta<strong>in</strong>ed to exclude myocardial<br />

ischemia. 4,6,37<br />

Basic laboratory studies <strong>in</strong>clud<strong>in</strong>g serum electrolytes <strong>and</strong><br />

creat<strong>in</strong><strong>in</strong>e levels should be rout<strong>in</strong>e, because hyponatremia<br />

is a common etiology <strong>of</strong> hiccups <strong>in</strong> acutely ill patients, although<br />

hypocalcemia, hypokalemia, or renal failure may be<br />

discovered. 6,34,35 O<strong>the</strong>r <strong>in</strong>vasive studies such as lumbar puncture<br />

to exclude CNS <strong>in</strong>fection or bronchoscopy to exclude<br />

<strong>in</strong>fection or a neoplasm should be performed only on a caseby-case<br />

basis.<br />

Complications <strong>of</strong> Persistent <strong>and</strong><br />

Intractable <strong>Hiccups</strong><br />

Table 3 displays some <strong>of</strong> <strong>the</strong> most common complications<br />

<strong>of</strong> ongo<strong>in</strong>g hiccups that may be encountered <strong>in</strong> <strong>the</strong> patient<br />

with cancer. General complications <strong>of</strong> <strong>in</strong>tractable hiccups <strong>in</strong>clude<br />

anxiety <strong>and</strong> exacerbation <strong>of</strong> depressive symptoms, both<br />

<strong>of</strong> which are common <strong>in</strong> patients with advanced or term<strong>in</strong>al<br />

cancer. 1,5,6 Sleep impairment due to nocturnal hiccups m<strong>in</strong>imizes<br />

necessary restorative sleep <strong>and</strong> leads to daytime somnolence<br />

<strong>and</strong> fatigue, which may worsen anxiety, depression,<br />

appetite, <strong>and</strong> cognitive function. 51<br />

Chronic hiccups <strong>in</strong>crease energy expenditure through con-<br />

124 www.Supportive<strong>Oncology</strong>.net Th e Jo u r n a l o f Su p p o rT i v e on c o l o g y


traction <strong>of</strong> skeletal muscles; this result <strong>in</strong>creases caloric requirements,<br />

which are <strong>of</strong>ten difficult to meet <strong>in</strong> patients who<br />

are receiv<strong>in</strong>g chemo<strong>the</strong>rapy or radiation <strong>the</strong>rapy. <strong>Hiccups</strong><br />

may <strong>in</strong>terfere with <strong>the</strong> <strong>in</strong>take <strong>of</strong> fluids <strong>and</strong> food, lead<strong>in</strong>g to<br />

poor caloric <strong>in</strong>take, which can result <strong>in</strong> malnutrition, weight<br />

loss, <strong>and</strong> dehydration. volume depletion <strong>and</strong> dehydration may<br />

result <strong>in</strong> decreased renal blood flow <strong>and</strong> impaired elim<strong>in</strong>ation<br />

<strong>of</strong> neurotoxic opioid metabolites. if a hiccup paroxysm occurs<br />

dur<strong>in</strong>g food <strong>in</strong>gestion, aspiration may lead to life-threaten<strong>in</strong>g<br />

acute airway obstruction or aspiration pneumonitis <strong>and</strong> respiratory<br />

failure.<br />

Negative <strong>in</strong>trathoracic pressures generated dur<strong>in</strong>g severe<br />

hiccup paroxysms may result <strong>in</strong> pneumomediast<strong>in</strong>um. 6,17,20 Hypotension<br />

may result from mechanisms mentioned previously<br />

<strong>and</strong> may be more likely to occur <strong>in</strong> <strong>the</strong> sett<strong>in</strong>g <strong>of</strong> hypotension<br />

or underly<strong>in</strong>g cardiovascular dysfunction. 20 Dehiscence <strong>of</strong> sternal<br />

<strong>and</strong> o<strong>the</strong>r surgical <strong>in</strong>cisions has been described. 6,19 Some<br />

authors have reported death as a complication <strong>of</strong> <strong>in</strong>tractable<br />

hiccups, although multiple comorbidities <strong>in</strong> <strong>the</strong> cancer population<br />

make this dist<strong>in</strong>ction difficult. 3–6<br />

Nonpharmacologic Options<br />

Benign, self-limited hiccups do not require pharmacologic<br />

or <strong>in</strong>vasive maneuvers for term<strong>in</strong>ation. However, some patients<br />

may attempt folk remedies <strong>and</strong> o<strong>the</strong>r nonpharmacologic<br />

approaches, which may be acceptable if cl<strong>in</strong>ically appropriate.<br />

Some folk remedies that anecdotally have been reported<br />

to term<strong>in</strong>ate hiccups <strong>in</strong>clude stimulation <strong>of</strong> <strong>the</strong> palate or<br />

pharynx with a cotton applicator or ca<strong>the</strong>ter; traction on <strong>the</strong><br />

tongue; pressure over <strong>the</strong> eyebrow area; lift<strong>in</strong>g <strong>the</strong> uvula with<br />

a spoon; perform<strong>in</strong>g a valsalva maneuver; gargl<strong>in</strong>g or dr<strong>in</strong>k<strong>in</strong>g<br />

ice water; eat<strong>in</strong>g a spoonful <strong>of</strong> granulated sugar or peanut<br />

butter; dr<strong>in</strong>k<strong>in</strong>g water from <strong>the</strong> opposite side <strong>of</strong> a cup; bit<strong>in</strong>g a<br />

lemon; black pepper–<strong>in</strong>duced sneez<strong>in</strong>g; sudden fright; breathhold<strong>in</strong>g;<br />

<strong>and</strong> breath<strong>in</strong>g <strong>in</strong>to a paper bag. <strong>in</strong>creased pCO2 <strong>and</strong><br />

cerebral vasoconstriction may be <strong>the</strong> physiologic explanation<br />

for hiccup cessation follow<strong>in</strong>g breath-hold<strong>in</strong>g or paper bag<br />

breath<strong>in</strong>g. 6,16,52–54 Digital rectal massage has been reported to<br />

be effective at term<strong>in</strong>at<strong>in</strong>g <strong>in</strong>tractable hiccups <strong>in</strong> small case<br />

series55,56 ; however, this measure is uncomfortable <strong>and</strong> should<br />

not be attempted <strong>in</strong> <strong>the</strong> sett<strong>in</strong>g <strong>of</strong> neutropenia or severe perianal<br />

dermatitis. Of course, not all <strong>the</strong>se approaches are appropriate<br />

for a given patient, but <strong>the</strong>y may be worth try<strong>in</strong>g if <strong>the</strong>y<br />

would not be detrimental for an <strong>in</strong>dividual patient.<br />

Pharmacologic Treatment<br />

<strong>Patient</strong>s with persistent or <strong>in</strong>tractable hiccups usually require<br />

pharmacologic <strong>in</strong>tervention, especially if quality <strong>of</strong> life is<br />

impaired or medical complications are apparent. 52,57 The only<br />

medication approved by <strong>the</strong> US Food <strong>and</strong> Drug Adm<strong>in</strong>istration<br />

(FDA) for hiccups is <strong>the</strong> antipsychotic phenothiaz<strong>in</strong>e<br />

chlorpromaz<strong>in</strong>e, which may not be optimal for all patients due<br />

to adverse effects such as hypotension, ur<strong>in</strong>ary retention, glaucoma,<br />

or delirium (Table 4). 4,6,57<br />

Treatments dat<strong>in</strong>g to <strong>the</strong> 1970s <strong>and</strong> 1980s <strong>in</strong>clude <strong>the</strong> anticonvulsants<br />

phenyto<strong>in</strong>, valproic acid, <strong>and</strong> carbamazep<strong>in</strong>e. 6,52,58<br />

Table 3<br />

Complications <strong>of</strong> <strong>Hiccups</strong><br />

Anxiety<br />

Arrhythmia<br />

Aspiration syndromes<br />

Bradycardia/heart block<br />

Carotid dissection<br />

Dehydration<br />

Depression<br />

Dyspnea/hypoxia<br />

Fatigue<br />

Malnutrition<br />

Pneumomediast<strong>in</strong>um<br />

Sleep deprivation<br />

Speech impairment<br />

Subcutaneous emphysema<br />

Vomit<strong>in</strong>g<br />

Weight loss<br />

Wound dehiscence<br />

vo l u m e 7, nu m b e r 4 ■ Ju ly/au g u S T 2009 www.Supportive<strong>Oncology</strong>.net<br />

Mar<strong>in</strong>ella<br />

These drugs may <strong>in</strong>hibit hiccups at <strong>the</strong> central level through<br />

blockade <strong>of</strong> neural sodium channels but possess a narrow <strong>the</strong>rapeutic<br />

<strong>in</strong>dex <strong>and</strong> <strong>the</strong> tendency for multiple drug <strong>in</strong>teractions,<br />

mak<strong>in</strong>g <strong>the</strong>m less than optimal <strong>in</strong> patients with advanced<br />

cancer who typically receive numerous medications. Amitriptyl<strong>in</strong>e,<br />

an older tricyclic antidepressant, may term<strong>in</strong>ate hiccups<br />

but is associated with significant adverse effects, ma<strong>in</strong>ly <strong>of</strong> an<br />

antichol<strong>in</strong>ergic nature. 6 Metoclopramide has been utililzed for<br />

at least 20 years <strong>and</strong> is <strong>of</strong>ten effective for term<strong>in</strong>ation <strong>of</strong> hiccup,<br />

most likely through central dopam<strong>in</strong>ergic blockade. 57,59<br />

Haloperidol, a dopam<strong>in</strong>e antagonist, may be useful <strong>in</strong> patients<br />

with concurrent agitated delirium, but monitor<strong>in</strong>g for extrapyramidal<br />

symptoms is important. 34,52,57 The antispasmodic<br />

GABA (gamma am<strong>in</strong>obutyric acid) antagonist bacl<strong>of</strong>en has<br />

some efficacy for <strong>the</strong> treatment <strong>of</strong> <strong>in</strong>tractable hiccups but may<br />

not be well tolerated by elderly patients due to <strong>the</strong> frequent<br />

occurrence <strong>of</strong> ataxia, delirium, dizz<strong>in</strong>ess, <strong>and</strong> sedation. 36,57<br />

The calcium channel blocker nifedip<strong>in</strong>e has been reported<br />

to term<strong>in</strong>ate persistent hiccups but has a propensity for <strong>in</strong>duc<strong>in</strong>g<br />

hypotension, which may be especially severe <strong>in</strong> volumecontracted<br />

patients or those receiv<strong>in</strong>g opioids. 60,61 Nimodip<strong>in</strong>e<br />

is a newer calcium channel blocker that has been reported to<br />

be effective <strong>in</strong> a few case reports. 62 The mechanism <strong>of</strong> hiccup<br />

term<strong>in</strong>ation with nifedip<strong>in</strong>e <strong>and</strong> nimodip<strong>in</strong>e is likely secondary<br />

to blockade <strong>of</strong> neuromuscular calcium channels. 60–62<br />

Bolus <strong>in</strong>travenous <strong>in</strong>fusion <strong>of</strong> <strong>the</strong> sodium channel–block<strong>in</strong>g<br />

anes<strong>the</strong>tic lidoca<strong>in</strong>e has term<strong>in</strong>ated hiccups <strong>in</strong> postoperative<br />

patients, but <strong>the</strong> risk for cardiovascular <strong>and</strong> neurologic toxicities<br />

should be considered <strong>in</strong> <strong>the</strong> frail patient with advanced<br />

malignancy. 63 Nebulized lidoca<strong>in</strong>e may be effective via a local<br />

anes<strong>the</strong>tic effect upon irritant sensory afferents <strong>and</strong> has a<br />

much greater safety pr<strong>of</strong>ile than does <strong>the</strong> <strong>in</strong>travenous route. 64<br />

Similarly, nebulized sal<strong>in</strong>e solution has been reported by some<br />

authors to term<strong>in</strong>ate hiccups <strong>in</strong> <strong>the</strong> palliative care settt<strong>in</strong>g. 65<br />

Although benzodiazep<strong>in</strong>es, especially valium, are wellknown<br />

precipitants <strong>of</strong> hiccups, <strong>the</strong> <strong>in</strong>travenous agent mida-<br />

125


Advanced Cancer: <strong>Diagnosis</strong> <strong>and</strong> <strong>Management</strong> <strong>of</strong> <strong>Hiccups</strong><br />

zolam has been successfully utilized <strong>in</strong> patients with term<strong>in</strong>al<br />

hiccups. 66 Midazolam <strong>in</strong>fusion may be especially useful if <strong>in</strong>tractable<br />

hiccups occur <strong>in</strong> <strong>the</strong> sett<strong>in</strong>g <strong>of</strong> refractory term<strong>in</strong>al<br />

delirium or agitation.<br />

The neurostimulant methylphenidate may term<strong>in</strong>ate hiccups<br />

through <strong>in</strong>hibition <strong>of</strong> dopam<strong>in</strong>e <strong>and</strong> norep<strong>in</strong>ephr<strong>in</strong>e uptake.<br />

<strong>Patient</strong>s with concurrent depression or opioid-<strong>in</strong>duced<br />

sedation may be good c<strong>and</strong>idates for methylphenidate treatment<br />

<strong>of</strong> hiccups. 67,68<br />

Nefopam, an <strong>in</strong>travenous nonopioid analgesic structurally<br />

related to antipark<strong>in</strong>sonian <strong>and</strong> antihistam<strong>in</strong>ic medications,<br />

has been reported to abruptly term<strong>in</strong>ate hiccups <strong>in</strong><br />

three patients with refractory hiccups, one <strong>of</strong> whom had acute<br />

leukemia. 69,70<br />

Carvedilol suppressed a 2-year bout <strong>of</strong> hiccups <strong>in</strong> a patient<br />

with tardive dysk<strong>in</strong>esia. 15 Although <strong>the</strong> mechanism is unclear,<br />

antagonism <strong>of</strong> <strong>the</strong> sympa<strong>the</strong>tic component <strong>of</strong> <strong>the</strong> afferent hiccup<br />

arc may be responsible. whe<strong>the</strong>r beta-adrenergic antagonists<br />

as a class are useful for treat<strong>in</strong>g hiccups is unclear, as data<br />

are <strong>in</strong>sufficient.<br />

Dexamethasone, although a recognized cause <strong>of</strong> hiccups, 71,72<br />

has term<strong>in</strong>ated persistent hiccups <strong>in</strong> patients with acquired immunodeficiency<br />

syndrome (AiDS) with progressive multifocal<br />

leukoencephalopathy. 73<br />

Because patients with advanced or term<strong>in</strong>al malignancy<br />

are <strong>of</strong>ten receiv<strong>in</strong>g numerous medications <strong>and</strong> have multiple<br />

comorbidities <strong>and</strong> organ dysfunction, a pharmacologic agent<br />

with m<strong>in</strong>imal adverse effects <strong>and</strong> drug <strong>in</strong>teractions would be<br />

<strong>of</strong> benefit. recently, case series <strong>of</strong> <strong>the</strong> effectiveness <strong>of</strong> gabapent<strong>in</strong><br />

on <strong>the</strong> term<strong>in</strong>ation <strong>of</strong> <strong>in</strong>tractable hiccups have been<br />

reported. 45,75 Gabapent<strong>in</strong>, a newer antiepileptic drug commonly<br />

utilized <strong>in</strong> cancer <strong>and</strong> palliative medic<strong>in</strong>e as an adjuvant<br />

pa<strong>in</strong> medication, produces blockade <strong>of</strong> neural calcium<br />

channels <strong>and</strong> <strong>in</strong>creases release <strong>of</strong> GABA, which may modulate<br />

diaphragmatic excitability. 74,76 Gabapent<strong>in</strong> is not hepatically<br />

metabolized <strong>and</strong> possesses no known significant drug<br />

<strong>in</strong>teractions, mak<strong>in</strong>g it a potentially useful agent <strong>in</strong> <strong>the</strong> advanced<br />

cancer sett<strong>in</strong>g. Low b<strong>in</strong>d<strong>in</strong>g to plasma prote<strong>in</strong>s makes<br />

gabapent<strong>in</strong> attractive <strong>in</strong> cancer patients, who <strong>of</strong>ten manifest<br />

hypoprote<strong>in</strong>emia due to malnutrition or liver dysfunction.<br />

Porzio et al 74 reported effective hiccup cessation with gabapent<strong>in</strong><br />

<strong>in</strong> three patients with advanced malignancy, with no<br />

obvious adverse effect. Gabapent<strong>in</strong> may be especially useful<br />

for hiccup <strong>the</strong>rapy <strong>in</strong> patients requir<strong>in</strong>g adjuvant analgesia<br />

related to neuropathic cancer pa<strong>in</strong>. whe<strong>the</strong>r gabapent<strong>in</strong> will<br />

emerge as front-l<strong>in</strong>e treatment for persistent <strong>and</strong> <strong>in</strong>tractable<br />

hiccups <strong>in</strong> <strong>the</strong> palliative care <strong>and</strong> hospice sett<strong>in</strong>gs rema<strong>in</strong>s to<br />

be seen.<br />

O<strong>the</strong>r Therapeutic Approaches<br />

Acupuncture may provide relief from <strong>in</strong>tractable hiccups.<br />

However, it may be difficult to perform <strong>in</strong> severely ill patients<br />

<strong>and</strong> to f<strong>in</strong>d a practitioner with expertise. 77,78<br />

Phrenic nerve block with a local anes<strong>the</strong>tic has been utilized<br />

to treat <strong>in</strong>tractable hiccups <strong>in</strong> several patients with advanced<br />

malignancies, <strong>in</strong>clud<strong>in</strong>g pancreatic, gastric, <strong>and</strong> lung carci-<br />

Table 4<br />

Reported Therapies for Persistent/Intractable <strong>Hiccups</strong><br />

Pharmacologic <strong>the</strong>rapy<br />

Bacl<strong>of</strong>en<br />

Carvedilol<br />

Chlorpromaz<strong>in</strong>e<br />

Gabapent<strong>in</strong><br />

Haloperidol<br />

Ketam<strong>in</strong>e<br />

Lidoca<strong>in</strong>e <strong>in</strong>fusion<br />

Methylphenidate<br />

Metoclopramide<br />

Nebulized sal<strong>in</strong>e or lidoca<strong>in</strong>e<br />

Nefopam<br />

Nifedip<strong>in</strong>e/nimodip<strong>in</strong>e<br />

Olanzap<strong>in</strong>e<br />

Phenyto<strong>in</strong><br />

Valproic acid<br />

Irritation <strong>of</strong> <strong>the</strong> pharynx with a rubber ca<strong>the</strong>ter<br />

Digital rectal stimulation<br />

Phrenic nerve block with local anes<strong>the</strong>sia<br />

Acupuncture<br />

Folk remedies<br />

nomas. Calvo et al 79 adm<strong>in</strong>istered a 1% lidoca<strong>in</strong>e solution via<br />

ultrasonographic guidance to <strong>the</strong> area <strong>of</strong> <strong>the</strong> phrenic nerve to<br />

five cancer patients with <strong>in</strong>tractable hiccups. <strong>Hiccups</strong> ceased<br />

<strong>in</strong> all five patients with<strong>in</strong> 5 m<strong>in</strong>utes. <strong>Hiccups</strong> did not recur<br />

<strong>in</strong> three patients, <strong>and</strong> <strong>the</strong>re were no adverse effects. 79 Phrenic<br />

nerve <strong>in</strong>jection may be a reasonable option for drug-refractory<br />

hiccups if an experienced practitioner is available.<br />

Conclusion<br />

Prolonged hiccups can lead to many detrimental effects <strong>in</strong><br />

<strong>the</strong> cancer <strong>and</strong> palliative care patient, <strong>in</strong>clud<strong>in</strong>g depression,<br />

poor sleep, exhaustion, malnutrition, weight loss, <strong>and</strong> aspiration<br />

syndromes. Pharmacologic treatment <strong>of</strong> benign, selflimited<br />

hiccups is generally unwarranted, but a variety <strong>of</strong> non<strong>in</strong>vasive<br />

folk remedies may be attempted <strong>in</strong> select patients.<br />

Chlorpromaz<strong>in</strong>e is <strong>the</strong> only FDA-approved drug for hiccup<br />

treatment. However, despite <strong>the</strong> lack <strong>of</strong> adequately powered<br />

<strong>and</strong> r<strong>and</strong>omized trials <strong>in</strong>volv<strong>in</strong>g hiccup treatment, <strong>the</strong> literature<br />

supports <strong>the</strong> utility <strong>of</strong> a variety <strong>of</strong> agents, <strong>in</strong>clud<strong>in</strong>g metoclopramide,<br />

haloperidol, bacl<strong>of</strong>en, midazolam, <strong>and</strong> calcium<br />

channel antagonists. <strong>in</strong> a small case series, gabapent<strong>in</strong> has recently<br />

been demonstrated to be effective for <strong>the</strong> term<strong>in</strong>ation<br />

<strong>of</strong> hiccups <strong>in</strong> patients with advanced malignancy. As gabapent<strong>in</strong><br />

is well tolerated, with few adverse events <strong>and</strong> drug <strong>in</strong>teractions,<br />

it may be an ideal drug for treat<strong>in</strong>g persistent <strong>and</strong><br />

<strong>in</strong>tractable hiccups <strong>in</strong> <strong>the</strong> palliative <strong>and</strong> advanced cancer sett<strong>in</strong>g.<br />

O<strong>the</strong>r benefits <strong>of</strong> gabapent<strong>in</strong> <strong>in</strong>clude pa<strong>in</strong>-modulat<strong>in</strong>g<br />

<strong>and</strong> antiseizure effects. Fur<strong>the</strong>r trials are necessary to def<strong>in</strong>e<br />

<strong>the</strong> role <strong>of</strong> gabapent<strong>in</strong> <strong>in</strong> <strong>the</strong> palliative sett<strong>in</strong>g.<br />

Conflicts <strong>of</strong> <strong>in</strong>terest: None to disclose.<br />

126 www.Supportive<strong>Oncology</strong>.net Th e Jo u r n a l o f Su p p o rT i v e on c o l o g y


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