EKG Week 1

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Main Refractory PeriodsConduction System•Sinoatrial (SA) Node(Internodal Atrial Pathways)•Atrio-Ventricular (AV) Junction•Bundle of His (HB)•Right & Left Bundle Branches (RBB, LBB)•Purkinje Fibers/Network (Ventricles)Sinoatrial (SA) Node• Located at the junction ofthe SVC & RA• Initiates electricalimpulses at a rate of 60to 100 beats/min• Normally the primarypacemaker of the heart
AV Junction• Area of AV node & Bundle ofHis down to branch of R & LBundles• Impulse delayed here toallow atrial contraction(“atrial kick”) & complete filling of ventricles• First escape pacemaker of the heart• Inherent rate of junction is 40 – 60 beats/min.Bundle of His (HB)• Electrical connectionbetween the atria & theventricles• Conducts impulsesbetween AV Junction &R & L BundlesR & L Bundle Branches• RBB: Innervates the RVentricle• LBB: Innervates the LVentricle & the intra-ventricular septum(from L to R)• LBB divides into 3 fasciclesPurkinje Fibers• Web of fibers thatpenetrate into theventricular muscle• Receive impulses fromR & L Bundle Branches& conducts impulse toventricles
Page 1 and 2: Cardiac Anatomy& Physiology• The
Page 3 and 4: Coronary ArteriesAutonomic Nervous
Page 5: CardiacElectrophysiology• Cardiac
Page 9 and 10: BasicElectrocardiography• Lead Sy
Page 11 and 12: Standard Limb Leads• Leads I, II,
Page 13 and 14: ECG Paper• Time markers = 1 secon
Page 15 and 16: PR Interval (PRI)• Begins with th
Page 17 and 18: Abnormal ST SegmentST Segment Varia
Page 19 and 20: QT Interval Measurement• R to R =
Page 21 and 22: Heart RateCalculation,Dysrhythmia A
Page 23 and 24: Dysrhythmia Analysis - “3 Rs”

EKG Week 1

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