A bundle-branch block indistinguishable from VT during a Symptom-Limited Test requires?

A bundle-branch block indistinguishable from VT during a Symptom-Limited Test requires?

• A. It requires careful monitoring or early termination.
• B. It requires immediate defibrillation.
• C. It indicates normal variant; continue testing.
• D. It indicates dehydration.

Answer: (A)

When a bundle-branch block looks indistinguishable from ventricular tachycardia during a symptom-limited exercise test, the priority is safety. You can’t reliably tell VT from a BBB pattern in this setting, so the test should be stopped or the monitoring intensified, with readiness to terminate early if the rhythm or the patient’s condition worsens. This approach protects the patient from the danger of an undetected VT progressing to instability. Immediate defibrillation is reserved for actual instability or a true VT with poor perfusion; if the rhythm remains stable, stopping and reassessing later is appropriate. Treating it as a normal variant and continuing or focusing on dehydration aren’t appropriate responses to a potentially dangerous rhythm on the monitor.

When a bundle-branch block looks indistinguishable from ventricular tachycardia during a symptom-limited exercise test, the priority is safety. You can’t reliably tell VT from a BBB pattern in this setting, so the test should be stopped or the monitoring intensified, with readiness to terminate early if the rhythm or the patient’s condition worsens. This approach protects the patient from the danger of an undetected VT progressing to instability. Immediate defibrillation is reserved for actual instability or a true VT with poor perfusion; if the rhythm remains stable, stopping and reassessing later is appropriate. Treating it as a normal variant and continuing or focusing on dehydration aren’t appropriate responses to a potentially dangerous rhythm on the monitor.