Junctional Tachycardia: Congenital, Acquired, Postoperative
Fig. 11.1 Junctional ectopic tachycardia. The AH interval is 240 ms during the junctional ectopic tachycardia, which has a cycle length of 290 ms. The long AH interval and short…
Sudden Cardiac Death in the Young
Sign/symptom Differential diagnosis for SCA Respiratory symptoms Hypertrophic cardiomyopathy (HCM), dilated cardiomyopathy, left ventricular outflow tract obstruction (LVOTO), restrictive or LV noncompaction cardiomyopathy Chest pain HCM, coronary anomalies, LVOTO, aortic…
Atrioventricular Nodal Reentry Tachycardia
Fig. 5.1 12-Lead electrocardiogram of AVNRT. Note that distinct P-waves are not visible Fig. 5.2 ECG leads I, II, and V5 and intracardiac electrograms in a 13-year-old girl with AVNRT…
Persistent Junctional Reciprocating Tachycardia
Fig. 6.1 Drawing of normal atrioventricular conduction tissue and concealed slowly only conducting retrograde accessory pathway supporting PJRT Clinical and Electrocardiographic Findings Persistent junctional reciprocating tachycardia usually presents during childhood…
Atrial Fibrillation
Fig. 9.1 Paroxysmal atrial fibrillation in a 17-year-old boy. Note the low amplitude fast waveforms (atrial fibrillatory waves) between the “irregularly irregular” QRS intervals. There are a few different QRS…
Complete Atrioventricular Block Third-Degree Heart Block
Fig. 16.1 ECG and His bundle electrogram of Complete Heart Block. Leads I, V1, V6 with an atrial (A) electrogram, a His bundle electrogram (H), and ventricular (V) electrogram demonstrating…
Atrial Ectopic Tachycardias
Fig. 10.1 12-Lead ECG from a 9-month-old boy with atrial ectopic tachycardia at 150 bpm. There is variable A-V conduction. The P-wave is large in many leads and has a…
Development and Structure of the Cardiac Conduction System
Fig. 1.1 Schematic representation of the primary heart tube (brown) and the secondary added myocardium derived from the second heart field (yellow), including differential genes and proteins expressed in the…
Pharmacology of Anti-arrhythmic Agents
Fig. 22.1 Ia lengthens the action potential (right shift); Ic does not significantly affect the action potential (no; Ib shortens the action potential (left shift) shift) Class I anti-arrhythmic agents…
