Emergency Medicine Exam 1 Practice

Which of the following is an H or T cause of cardiac arrest?

Hypoxia Myocardial infarction Hyperthermia Hyperglycemia

Correct Answer:

Hypoxia

Explanation:

In cardiac arrest, reversible causes are grouped as H and T to guide rapid assessment and treatment during resuscitation. Hypoxia is the best answer because inadequate oxygen delivery to the heart and brain cripples electrical activity and pump function. Without sufficient oxygen, the myocardium cannot sustain contractions, so securing airway and ventilation to restore oxygenation is a foundation of resuscitation and can directly reverse the arrest. While myocardial infarction can trigger an arrest, it is not one of the H or T reversals themselves, and hyperthermia is not part of the standard H/T list (hypothermia is). Hyperglycemia isn’t a defined H/T reversible cause in this context either.

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