Desynchronised defibrillation is used to –
**Core Concept**
Desynchronised defibrillation refers to the delivery of a high-energy electrical discharge to the heart without synchronisation with the cardiac cycle, aiming to restore a viable cardiac rhythm in cases of life-threatening arrhythmias.
**Why the Correct Answer is Right**
Desynchronised defibrillation is used when the cardiac rhythm is so abnormal that it is not possible to capture a coherent electrocardiogram (ECG) or when the patient's condition does not allow for synchronisation. The high-energy shock disrupts the abnormal electrical activity, allowing the heart to return to a normal rhythm. This technique is often employed in emergency situations, such as cardiac arrest, where every minute counts.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is not relevant to desynchronised defibrillation, as it is not a recognised indication for this procedure.
**Option B:** This option is incorrect because synchronised cardioversion is used to restore a normal cardiac rhythm in patients with atrial fibrillation or flutter, not desynchronised defibrillation.
**Option C:** This option is not correct because transcutaneous pacing is used to treat bradycardia or symptomatic heart block, not desynchronised defibrillation.
**Clinical Pearl / High-Yield Fact**
In emergency situations, desynchronised defibrillation should be performed as soon as possible, with minimal delay, to maximise the chances of successful resuscitation.
**Correct Answer: D.**