Desynchronised defibrillation is used in –
**Core Concept**
Desynchronised defibrillation refers to the delivery of an electrical shock to the heart without synchronising it with the cardiac cycle, typically in the absence of a pulse. This approach is used when there is no palpable pulse or when the patient's rhythm is so disorganised that synchronisation is not feasible.
**Why the Correct Answer is Right**
Desynchronised defibrillation is used when the patient's heart rhythm is not amenable to cardioversion or when the patient is in cardiac arrest. The goal is to restore a perfusing rhythm, and the shock is delivered in a biphasic or monophasic waveform, depending on the device. This approach is often used in emergency situations, such as cardiac arrest, where every minute counts.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because synchronised cardioversion is used when the patient's heart rhythm is organised, allowing for precise timing of the shock.
**Option B:** This option is incorrect because transcutaneous pacing is used to temporarily regulate the heart rate in patients with bradycardia, not for defibrillation.
**Option C:** This option is incorrect because intravenous medications are used to treat various arrhythmias, not for defibrillation.
**Clinical Pearl / High-Yield Fact**
In cardiac arrest situations, the American Heart Association (AHA) guidelines recommend that defibrillation should be performed as soon as possible, ideally within 2 minutes of arrival.
**Correct Answer: C.**