A patient on antidepressant therapy developed sudden hypeension on consuming cheese. The antidepressant is possibly:
**Core Concept**
The patient's reaction to cheese is likely due to an interaction between the antidepressant and a naturally occurring compound in cheese, resulting in increased blood pressure. This interaction involves the inhibition of an enzyme responsible for metabolizing a key substance in cheese.
**Why the Correct Answer is Right**
The antidepressant in question is likely a monoamine oxidase inhibitor (MAOI). MAOIs work by inhibiting the enzyme monoamine oxidase (MAO), which breaks down monoamines such as serotonin, norepinephrine, and dopamine. Cheese contains tyramine, a monoamine that is normally broken down by MAO. Without sufficient MAO activity, tyramine can accumulate and cause blood vessels to constrict, leading to a sudden increase in blood pressure. This reaction is known as a hypertensive crisis.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because selective serotonin reuptake inhibitors (SSRIs) do not inhibit MAO and therefore do not cause a hypertensive crisis with tyramine-rich foods like cheese.
**Option B:** This option is incorrect because tricyclic antidepressants (TCAs) can have various interactions but are not typically associated with a hypertensive crisis from cheese consumption.
**Option C:** This option is incorrect because serotonin-norepinephrine reuptake inhibitors (SNRIs) also do not inhibit MAO and are not known to cause a hypertensive crisis with tyramine-rich foods.
**Clinical Pearl / High-Yield Fact**
MAOIs can cause a hypertensive crisis with tyramine-rich foods, and patients taking these medications should avoid consuming foods like aged cheese, red wine, and certain types of meat. This interaction is a classic example of a pharmacological adverse effect that can be life-threatening if not recognized and managed promptly.
**Correct Answer:** D. MAOI