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%],...
Sinus bradycardia can be defined as a sinus rhythm with a resting heart rate of 60 beats per minute or less. However, few patients actually become symptomatic until their heart rate drops to less than 50 beats per minute. The action potential responsible for this rhythm arises from the sinus...
In normal sinus rhythm, what does the P-wave, the PR interval, QRS complex, and QT interval reflect?Question:In normal sinus rhythm, what does the P-wave, the PR interval, QRS complex, and QT interval reflect?ECG:An ECG, or electrocardiogram, is an ele...
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...
Prolonged and decremental antegrade conduction properties in right anterior accessory connections: Wide QRS antidromic tachycardia of left bundle branch bl... et al.Prolonged and decremental antegrade conduction properties in right anterioraccessory connections: wide QRS antidromic tachycardia of left bundle ...
(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...
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....
Accelerated Idioventricular Rhythm Wide Complex Tachycardia Ventricular Tachycardia Management in the Adult Ventricular Tachycardia Management in the Child Cardiac Electrical Storm See Also Page Contents Tachycardia Tachycardia due to Medications Inappropriate Sinus Tachycardia ...
It occurs in patients with or without heart disease, most of them with no prior evidence of AV or intraventricular conduction abnormalities. AV block is localized within the AVN, is associated with a narrow QRS escape rhythm, and is generally benign. The prevalence of vagally mediated AV block...