**Question:** ECT in depressive phase of MDP is useful because it-

A. Improves cognitive function
B. Reduces anxiety symptoms
C. Alleviates psychotic symptoms
D. Reverses organic brain dysfunction

**Core Concept:** Electroconvulsive Therapy (ECT) is a psychiatric procedure that involves passing electrical currents through the brain to induce a controlled seizure. It is primarily used to treat severe and treatment-resistant psychiatric disorders such as major depressive disorder (MDP).

**Why the Correct Answer is Right:** ECT is particularly useful in the depressive phase of MDP because it can induce rapid remission of depressive symptoms and improve overall functioning. The therapeutic mechanism involves the release of neurotransmitters, such as serotonin, dopamine, and norepinephrine, which are known to play a crucial role in mood regulation. ECT can also modulate the activity of the hypothalamic-pituitary-adrenal (HPA) axis and the sympathetic nervous system.

**Why Each Wrong Option is Incorrect:**

A. Improving cognitive function is not the primary goal of ECT in the depressive phase of MDP. The main reason is to alleviate severe depressive symptoms and enhance overall functioning.

B. Anxiety symptoms are not the primary target of ECT in this context. ECT is more focused on treating the depressive phase of MDP, not anxiety symptoms.

C. ECT does not primarily target psychotic symptoms in the depressive phase of MDP. Its main purpose is to alleviate severe depressive symptoms and improve functioning.

D. Reversing organic brain dysfunction is not the primary focus of ECT in the depressive phase of MDP. ECT aims to treat the depressive symptoms and enhance overall functioning, rather than correcting organic brain dysfunction.

**Clinical Pearl:** ECT is a highly effective treatment option for patients with severe, treatment-resistant major depressive disorder, particularly in the depressive phase. It helps to alleviate profound depressive symptoms and improve daily functioning, rather than focusing on specific psychiatric symptoms or correcting organic brain dysfunction. It is often considered as a last resort treatment when other therapeutic approaches have failed to provide significant improvement.