If a patient with history of MI is given a MAOI antidepressant then what will be the possible complication th… - NORCET 3 - 2022 (Shift-1)

NORCET 3 - 2022 (Shift-1)

Pharmacology

Medium

Appeared in: NORCET 3 - 2022 (Shift-1)

Explanation

Monoamine Oxidase Inhibitors (MAOIs) prevent the breakdown of tyramine, an amino acid found in certain foods.
Ingesting tyramine-rich foods while on an MAOI leads to a massive release of norepinephrine, a potent vasoconstrictor.
This surge in norepinephrine causes a rapid and severe increase in blood pressure, known as a hypertensive crisis.
In a patient with a history of myocardial infarction (MI), the extreme cardiac workload from a hypertensive crisis can precipitate a new cardiac event, such as re-infarction or heart failure.

Option B: Glaucoma is not a characteristic complication of MAOIs. It is more commonly associated with drugs that have strong anticholinergic properties, such as some Tricyclic Antidepressants (TCAs), which can cause pupillary dilation and increase intraocular pressure in individuals with narrow-angle glaucoma.
Option C: While a severe hypertensive crisis can potentially trigger an arrhythmia, dysrhythmias are more classically associated with Tricyclic Antidepressants (TCAs). TCAs can delay cardiac conduction and are known to be cardiotoxic in overdose, leading to ventricular arrhythmias.
Option D: Tachycardia (a rapid heart rate) is a symptom of a hypertensive crisis, not the primary complication itself. The root cause and most dangerous element of the crisis is the extreme elevation in blood pressure.

Visual 1: Flowchart - Illustrating the pathway from MAOI administration to hypertensive crisis. (MAOI inhibits MAO enzyme -> Patient ingests tyramine -> Tyramine is not broken down -> Norepinephrine levels surge -> Vasoconstriction -> Hypertensive Crisis).
Visual 2: Infographic - A chart listing common high-tyramine foods (aged cheeses, cured meats, fermented products) and low-tyramine alternatives, titled 'MAOI Diet Guide'.

Clinical Relevance

Nursing practice connection: Use the key finding related to Complications of MAOI Antidepressants to guide bedside assessment, documentation, and the next nursing action.
Patient education is a critical nursing responsibility. Nurses must ensure any patient starting an MAOI understands the strict dietary and medication restrictions to prevent a hypertensive crisis.
Nurses should monitor blood pressure regularly, especially during the initial phase of treatment and after any dose adjustments.
Recognizing the signs of a hypertensive crisis (severe headache, stiff neck, palpitations, sweating) is vital for prompt intervention, which includes stopping the drug and administering antihypertensives like phentolamine.

How to Approach the Question

First, identify the drug class mentioned in the question: Monoamine Oxidase Inhibitor (MAOI).
Next, recall the most significant and life-threatening adverse effect associated with MAOIs. This is the hypertensive crisis caused by interaction with tyramine.
Consider the patient's specific history: a history of Myocardial Infarction (MI). This makes any event that severely stresses the heart, like a hypertensive crisis, extremely dangerous.
Evaluate the options based on this knowledge. Hypertensive crisis is the direct, hallmark complication of MAOI-tyramine interaction.
Rule out the other options. Glaucoma and dysrhythmias are more characteristic of other antidepressant classes (like TCAs). Tachycardia is a symptom of the crisis, not the primary complication itself.

Concept Tested & Keywords

Concept Tested: Complications of MAOI Antidepressants
Stem keywords: patient, history of MI, MAOI antidepressant, complication
Lead-in keywords: what will be the possible complication
Clinical cues: History of MI: Indicates a compromised cardiovascular system, making blood pressure spikes particularly dangerous.

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