Fig. 18.1 Percentage of patients with each indication for device implantation. All are new implants since 2000. Cong Block = nonsurgically related heart block; Surg Block = surgically related heart block; Surg SND = surgically related…
Electrocardiographic manifestations of sick sinus syndrome Sinus bradycardia Extreme sinus arrhythmia Tachycardia–bradycardia syndrome Sinoatrial exit block Sinus pause/sinus arrest Sinoatrial reentrant tachycardia Electrocardiographic findings associated with sick sinus syndrome Intra-atrial…
Fig. 4.1 Cartoon of the heart demonstrating the atrioventricular conduction system with a left accessory connection. The P-wave and QRS complex are show short the indicating the impulse PR interval…
Fig. 15.1 Sinus rhythm with a junctional premature beat (J), which results in AV node refractoriness and block of the next sinus beat. *Subsequent non-conducted atrial impulse may be due…
Fig. 20.1 M-mode echocardiogram from fetus in sinus rhythm. Upper image demonstrates beam position through the atrium and ventricle. Small arrows mark atrial contractions, and arrowheads mark ventricular contraction. Note…
In this equation, R = the universal gas constant, T = absolute temperature, F = the Faraday constant, and X is the ion in question. As an example, the usual intracellular and extracellular concentration of potassium…
Fig. 8.1 The inner geometry of the right atrium showing the reentrant loop of a typical flutter circuit. Notice that the typical flutter circuit passes between the IVC and the…
Fig. 19.1 Panels (a) and (b): Demonstrating long QTc 0.54 s in an 18-month-old boy with sensorineural deafness. Panel (c): Marked T-wave alternans. Panel (d): Spontaneous ventricular fibrillation, which self-terminated….
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…
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…
