Diagnosis and Management of Hiccups in the Patient - Oncology ...
Diagnosis and Management of Hiccups in the Patient - Oncology ...
Diagnosis and Management of Hiccups in the Patient - Oncology ...
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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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