MEDICINE
CARDIOLOGY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Electrical capture during transcutaneous cardiac pacing is characterized by:
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the presence of a strong pulse, despite a slow rate.
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a pacemaker spike followed by a wide QRS complex.
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narrow QRS complexes that are preceded by a pacemaker spike.
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low-amplitude QRS complexes preceded by a pacemaker spike.
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Explanation:
Detailed explanation-1: -Electrical capture is assessed by inspection of the ECG tracing on the pacing unit monitor. Successful capture is usually characterized by a widened QRS complex, followed by a distinct ST segment and broad T wave (Figure 2).
Detailed explanation-2: -Ventricular pacing spikes precede most of the QRS complexes.
Detailed explanation-3: -The QRS complex is wide due to ventricular depolarization proceeding outside the conduction system.
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