Wide QRS complex tachycardiaA 58-year-old man with hypertension and half a year ago documented left bundle branch block(LBBB)in his past history presented with progressive dyspnea.A pre-admission echocardiography showed severely depressed systolic left ventricular function[ejection fraction(EF)=27%],...
The action potential responsible for this rhythm arises from the sinus node and causes a P wave on the surface ECG that is normal in terms of both amplitude and vector. The presence of sinus bradycardia in itself does not cause a change in the QRS complex and T wave. The frequency of ...
Wide complex tachycardia with atrioventricular dissociation and QRS morphology identical to that of sinus rhythm: a manifestation of bundle branch reentry. To determine the features that distinguish bundle branch reentry (BBR) ventricular tachycardia from a supraventricular tachycardia with aberration on the...
The ventricular rate for PACs is defined as: A)depends on underlying rhythm. B)less than 10 bpm. C)greater than 100 bpm. D)60- 100 bpm. Describe the electrical events occurring in the heart that are responsible for the P wave, QRS complex and T waves...
Wide complex tachycardia with atrioventricular dissociation and QRS morphology identical to that of sinus rhythm: a manifestation of bundle branch reentry All patients had had a previous myocar-dial infarction and had a dilated left ventricle. Conclusion—The presence of (a) wide complex extrasystoles...
(SA) reentrantSVT. CSM can be helpful to diagnose the atrial rhythm during atachycardiaby producingAV block. For example, CSM-induced AV block can allowatrial flutter(AFL) waves to be seen. CSM may also be helpful to cause ventriculoatrial conduction block when there is a wideQRS complex...
Withsinus bradycardia,sinus rhythmis present and the heart rate is less than 60 beats/min (seeFig. 13.3). This arrhythmia commonly occurs in the conditions listed inBox 13.2. Moderatesinus bradycardiausually produces no symptoms. If the heart rate is very slow (especially, less than 30–40 bea...
Each had recurrent sustained wide QRS tachycardia due to antegrade conduction through the accessory connection. Three patients underwent epicardial mapping and successful surgical division of their accessory connection. Two of the three had a second accessory connection that was also divided surgically. ...
As shown in the Supplemental Figure, we found that the optimal interval to detect subtle changes of AF detection during a sinus rhythm was approximately within 240 ms (about 120 sample size) before the QRS complex by the validation accuracy test. The moving average is computed by averaging the...
The heart rate is typically used to describe how many beats per minute the heart generates. The heart rhythm generally is used to describe the pattern in which the heart beats. The normal cardiac rhythm that is typical is a normal sinus rhythm....