Ventricular Quadrigeminy as a Manifestation of Concealed
نویسندگان
چکیده
Long rhythm strips were analyzed from five patients with frequent ventricular extrasystoles. The predominant pattern was quadrigeminal; i.e., three sinus beats between extrasystoles. However, about 20% of the interectopic intervals contained numbers of sinus beats (S) greater than three. Analysis of the distribution of such values of S > 3 revealed that there were many more odd than even values (P < 0.001). Also, carotid sinus pressure yielded only odd values of S > 3. This predominance of odd values strongly suggested the existence of concealed extrasystoles. Therefore, all odd values of S > 3 were analyzed to determine whether they satisfied the criterion for concealed bigeminy (S = 2n 1) or for concealed quadrigeminy (S = 4n 1). The distribution was found to satisfy the criterion for concealed bigeminy, suggesting that the quadrigeminal pattern was a manifestation of a 2:1 rather than a 4:1 block in a re-entry loop. Stable quadrigeminy occurs often in concealed bigeminy, because the re-entrant impulse finds the myocardium excitable after a normal R-R interval but refractory after a compensatory pause.
منابع مشابه
Ventricular quadrigeminy as a manifestation of concealed bigeminy.
Long rhythm strips were analyzed from five patients with frequent ventricular extrasystoles. The predominant pattern was quadrigeminal; i.e., three sinus beats between extrasystoles. However, about 20% of the interectopic intervals contained numbers of sinus beats (S) greater than three. Analysis of the distribution of such values of S greater than 3 revealed that there were many more odd than ...
متن کاملEcho Assessment ofPVR
coupling interval, and the "rule of multiples." Saishin-Igaku 15: 1865, 1960 2. Schamroth L, Marriott JHL: Intermittent ventricular parasystole with observations on its relationship to extrasystolic bigeminy. Am J Cardiol 7: 799, 1961 3. Schamroth L, Marriott HJL: Concealed ventricular extrasystoles. Circulation 27: 1043, 1963 4. Schamroth L: The physiological basis of ectopic ventricular rhyth...
متن کاملRe-entrant ventricular arrhythmias in the late myocardial infarction period. 3. Manifest and concealed extrasystolic grouping.
Re-entrant beats with regular extrasystolic grouping were seen in 44- of dogs 3--7 days following ligation of the anterior descending coronary artery. Utilizing direct recording of the re-entrant pathway (RP) from the epicardial surface of the infarction zone, we found extrasystolic grouping to be based on the infarction tachycardia-dependent conduction disorders in a potentially RP. Trigeminy ...
متن کاملNew manifestations of electrophysiological remodeling of heart during experimental model of atrial fibrillation in cirrhotic rat isolated heart
Introduction: The present study is aimed to evaluate electrophysiological remodeling of atrioventricular (AV) node and ventricular conduction during experimental atrial fibrillation (AF) model in isolated heart of cirrhotic rats. Methods: Cirrhosis-induced electrophysiological remodeling was evaluated in 24 isolated retrogradely perfused rat hearts in 2 groups (control and cirrhotic). Cirrho...
متن کاملElectrical alternans of the T-U wave without change in the QRS complex.
A patient with myelocytic leukemia who showed electrical alternans of the T-U wave with no change in the QRS complex following chemotherapy is described. Electrocardiogram taken 4 days later showed ventricular quadrigeminy in which the T-U wave of the first sinus beat after the ventricular premature contraction was markedly less prominent compared to the successive two sinus beats which showed ...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 2005