In this article, I will provide an overview of the concept of capture beat, a fusion beat that occurs when a supraventricular and a ventricular impulse coincide. I will explain what a capture beat is, how it is detected on an ECG, and what the learning points are for understanding this phenomenon.
What is Capture Beat?
A capture beat is a type of fusion beat that occurs when an occasional, normal sino-atrial node impulse is conducted through to the ventricle. Capture beats can be detected on an ECG as a narrow QRS complex, which is a waveform that indicates electrical activity in the heart. In some cases, ventricular tachycardia (VT) can display regular capture beats. Capture beats can be distinguished from fusion beats by the presence of a “capture” beat, which is a waveform that indicates the electrical activity of the heart.
A fusion beat is a type of beat that occurs when a supraventricular and a ventricular impulse coincide to produce a hybrid complex. This type of beat is typically seen on an ECG as a broad QRS complex, which is a waveform that indicates electrical activity in the heart. In cases where VT is present, fusion beats can be distinguished from capture beats by the presence of a “fusion” beat, which is a waveform that indicates the electrical activity of the heart.
How is Capture Beat Detected?
Capture beats can be detected on a 12 lead ECG with endocardial recordings. This type of ECG produces a waveform that shows electrical activity in the heart, and it is used to detect capture beats. In cases where VT is present, capture beats can be distinguished from fusion beats by the presence of a “capture” beat, which is a waveform that indicates the electrical activity of the heart.
Capture beats can also be detected on a 12 lead ECG with endocardial recordings from patient 2 during simultaneous VT and AF showing narrow QRS beats. Beats #7, 8, and 9 are likely capture beats or fusion beats. The presence of a “capture” beat indicates a normal sino-atrial node impulse is conducted through to the ventricle, while the presence of a “fusion” beat indicates a supraventricular and a ventricular impulse coincide to produce a hybrid complex.
Learning Points
The following are key learning points for understanding the concept of capture beat:
- Ventricular tachycardia (VT) can rarely demonstrate regular capture beats.
- Fascicular VT is amenable to radiofrequency ablation.
- Capture beats occur when an occasional, normal sino-atrial node impulse is conducted through to the ventricle.
- Fusion beats occur when a supraventricular and a ventricular impulse coincide to produce a hybrid complex.
Capture and fusion beats can be detected on an ECG with endocardial recordings, which produces a waveform that shows electrical activity in the heart. Understanding capture and fusion beats is important for diagnosing and treating ventricular tachycardia.
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What are the differences between a capture beat and a fusion beat?
Following the first P wave, a supraventricular impulse can cause a ventricular activation that mixes with the ventricular complex, resulting in a capture beat that looks like a normal QRS complex.
What is the combination of electrical signals on an electrocardiogram?
A fusion beat is when two different heart rhythms, one from the upper chambers (supraventricular) and one from the lower chambers (ventricular), happen at the same time. This creates a combination of the two rhythms and suggests that there are two pacemaker cells firing at the same time – one from the upper chambers and one from the lower chambers.
What distinguishes VTach from VFib?
VT or VTach is a condition wherein the ventricles contract at a rate over 100 times per minute while VF or VFib is a rapid shaking of the ventricular walls that stops them from functioning properly.
How do V Tach and sinus tach differ?
Ventricular tachycardia is a dangerous condition that begins in the ventricles of the heart and causes them to beat very quickly. On the other hand, sinus tachycardia is an elevated heart rate which is regulated by the sinoatrial node, the heart’s natural pacemaker, which is sending electrical signals at a faster rate.
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