An 83 year old patient was hospitalized after suffering from a myocardial infarction. They report anxiety, depressed mood, decreased appetite, 15 pound weight loss, and poor sleep. Which antidepressant is the best option for this patient assuming no contraindications with other medications he is taking?

A. Mirtazapine (Remeron): Mirtazapine is a noradrenergic and specific serotonergic antidepressant that promotes appetite and weight gain while improving sleep. These properties make it ideal for elderly patients experiencing post-MI depression with weight loss, poor appetite, and insomnia. It also has a relatively low risk of cardiovascular adverse effects compared with other antidepressants. B. Bupropion (Wellbutrin): Bupropion is activating and may exacerbate insomnia or anxiety. It can also increase blood pressure and has limited effect on appetite or weight gain, making it less suitable for elderly patients with post-MI weight loss and sleep disturbances. C. Trazodone (Desyrel): Trazodone primarily improves sleep due to its sedative properties but has minimal effect on appetite or weight gain. Its antidepressant effect may be insufficient alone for post-MI depression, and orthostatic hypotension is a concern in older adults. D. Venlafaxine (Effexor): Venlafaxine is an SNRI effective for depression but can increase blood pressure, which is a risk in post-MI patients. It does not promote appetite or weight gain and may worsen insomnia, making it less optimal for this patient profile.