National Dental Examining Board of Canada (NDEB) Practice Exam

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Master your National Dental Examining Board of Canada (NDEB) exams with our comprehensive practice guide. Achieve excellence in your dental certification with expertly crafted questions and detailed explanations.

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Cardiovascular collapse caused by a high circulating dose of a LA is due to what?

Myocardial Depression
Ventricular Fibrillation
Arterial Blockage
Respiratory Arrest

The correct answer is: Myocardial Depression

Cardiovascular collapse can occur when individuals inadvertently receive a large dose of local anesthetic. This can cause severe systemic toxicity, resulting in a decrease in heart rate, blood pressure, and cardiac output. This is known as myocardial depression, which can lead to cardiovascular collapse. Option B, ventricular fibrillation, is incorrect as it refers to a specific type of arrhythmia that can occur in response to local anesthetic toxicity, rather than being the cause of cardiovascular collapse. Option C, arterial blockage, is incorrect as it does not specifically address the mechanism of cardiovascular collapse in response to high doses of local anesthetic. Option D, respiratory arrest, is also incorrect as it is not a direct cause of cardiovascular collapse, although it can contribute to it in certain cases.