OBJECTIVE To evaluate a management protocol of fetal supraventricular tachycardia (SVT) based on prior identification of the underlying mechanism. DESIGN AND SETTING Prospective study in a mother-child tertiary university centre. PATIENTS During a consecutive 36 month period, 18 fetuses with sustained SVT underwent a superior vena cava/ascending aorta (SVC/AA) Doppler investigation in an at...

OBJECTIVE To review the diagnosis and management of cardiac arrhythmias in a two-part presentation. DATA SOURCES Articles and published peer-review abstracts on tachycardias and bradycardias. SUMMARY OF REVIEW Normal cardiac rhythm originates from impulses generated within the sinus node. These impulses are conducted to the atrioventricular node where they are delayed before they are distri...

conclusions echocardiography and 2d speckle tracking strain imaging shows improvements in left ventricular deformation indices in atrioventricular reentrant tachycardia (avrt) and atrioventricular nodal reentrant tachycardia (avnrt) patients for the mean systolic strain and strain rate at 24 hours and the three-month follow-up. in spite of the normal lvef, even during sinus rhythm, deformation ...

The aim of this study was to review published data on gender differences in cardiac electrophysiology and in the presentation and clinical treatment of arrhythmias. The evidence from studies published to date show that women have a higher mean resting heart rate, a longer QT interval, a shorter QRS duration, and a lower QRS voltage than men. Women have a higher prevalence of sick sinus syndrome...

A 45-year-old woman underwent an electrophysiology procedure because of a 20-year history of recunent episodes of paroxysmal tachycardia. The baseline sinus cycle length, atrial-His. and His-ventricular intervals were 700, 60, and 45 msec, respectively, and the QRS duration was 80 msec. Ventricular pacing at a cycle length of 300 msec induced a tachycardia that had a cycle length of 320 msec an...

A 30year old patient presented to us with recurrent episodes of palpitation and documented tachycardia. In all his presentations a wide QRS tachycardia was recorded. The baseline ECG showed pre excitation. The 12 lead ECG of the tachycardia and the baseline ECG is shown in Fig. 1A. During EP study the patient had baseline pre excitation and the HV interval was 16 ms. A duo-decapolar halo (HL) c...

Case presentation A 32-year-old woman presented with a history of palpitations over the prior 7 days. Twelve-lead ECG indicated an irregular, wide QRS complex tachycardia with a left bundle branch block (LBBB) morphology and a late precordial R/S transition (Panel A). Echocardiography and cardiac magnetic resonance imaging demonstrated no evidence of structural heart disease. This arrhythmia di...

Electrode catheter recordings of the bundle of His (H), the right bundle branch (RB) and the left bundle branch (LB) were obtained in 15 dogs without thoracotomy during sinus rhythm and digitalis-induced ventricular tachycardia. During sinus rhythm an H-RB-LB sequence was recorded. This sequence was unchanged during atrial stimulation at rapid rates or during cardiac slowing by vagal stimulatio...

The objective of this article is to review supraventricular arrhythmias emphasized the importance of atrial fibrillation (AF) and its novel therapeutic approach in dogs. Supraventricular arrhythmias include disturbances of impulse formation at sinus node, atria and junctional area or alterations of impulse conduction within the chamber above ventricles. Among those supraventricular arrhythmias,...