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Oral Medicine NEET MDS Practice Test
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Oral Medicine - 3 Questions

1
Oral Medicine

In a patient with suspected acute coronary syndrome, which of the following ECG changes is most indicative of an ST-elevation myocardial infarction (STEMI)?
1) ST depression in leads II, III, and aVF
2) ST elevation in leads I and aVL
3) ST elevation in leads V1-V4 with reciprocal depression in leads II, III, and aVF
4) ST elevation in leads II, III, and aVF

📝 Explanation:

In a patient with a suspected STEMI, the characteristic ECG findings include ST elevation in the anterolateral leads (I, aVL, V1-V6) and reciprocal ST depression in the inferior leads (II, III, aVF). The pattern of ST elevation in the anterolateral leads with reciprocal depression in the inferior leads is most indicative of a STEMI affecting the anterolateral wall of the heart.

2
Oral Medicine

Which of the following is a characteristic of pulmonary embolism?
1) Absent breath sounds
2) Hyperinflated lungs
3) Pleural friction rub
4) Wheezing

📝 Explanation:

Pulmonary embolism is often associated with the sudden onset of absent or diminished breath sounds on the affected side of the chest due to the obstruction of a pulmonary artery by a blood clot.

3
Oral Medicine

A patient with severe nausea and vomiting is prescribed metoclopramide. What is the primary mechanism of action of metoclopramide?
(1) Antihistaminic action
(2) Dopamine antagonism in the CNS
(3) Muscarinic receptor antagonism
(4) 5-HT3 receptor antagonism

📝 Explanation:

Metoclopramide acts primarily as a dopamine D2 receptor antagonist in the chemoreceptive trigger zone in the brain and in the gastrointestinal tract, which helps to reduce nausea and vomiting by decreasing gastric emptying and increasing gastric tone.

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