Which of the following mode of electrode placement is most commonly employed in ECT?
**Core Concept:** Electroconvulsive therapy (ECT) is a psychiatric procedure that uses electric stimulation to induce a brief, controlled seizure in the brain to treat severe psychiatric disorders. Electrodes placement plays a crucial role in modulating the depth and extent of seizure.
**Why the Correct Answer is Right:** The most commonly employed mode of electrode placement for ECT is **Option C: Bilateral temporal electrodes**. This method involves placing two electrodes on each side of the head, one above the eyebrow and the other at the temple. The stimulation is delivered between these two electrodes, causing bilateral electroconvulsive seizures. This method ensures widespread cortical stimulation, leading to a more profound generalised seizure and a stronger therapeutic response.
**Why Each Wrong Option is Incorrect:**
A. **Unilateral temporal electrodes (Option A)**: Placing only one electrode on the forehead and the other at the temple causes a unilateral seizure, which may not be sufficient for achieving adequate therapeutic effects.
B. **Central electrodes (Option B)**: Placing electrodes centrally on the forehead results in a more focal seizure, with limited cortical stimulation, reducing the therapeutic response.
D. **Occipital electrodes (Option D)**: Placing electrodes on the occipital region results in a predominantly occipital seizure, which may not be effective in treating psychiatric disorders.
**Clinical Pearl:** ECT's therapeutic efficacy depends on the extent and depth of seizure spread. Bilateral temporal electrodes placement ensures widespread cortical stimulation and a stronger therapeutic response compared to other electrode placements.