Advanced Cardiovascular Life Support (ACLS) Practice Exam 2025 - Free ACLS Practice Questions and Study Guide

Question: 1 / 400

Which of the following is NOT one of the 5 H's?

Thrombosis, pulmonary

The 5 H's refer to a set of reversible causes of cardiac arrest that are critical to recognize and address during advanced cardiovascular life support. These conditions are Hypovolemia, Hypoxia, Hydrogen ion (indicating acidosis), Hyperkalemia, and Hypothermia.

Considering this context, thrombosis, particularly pulmonary thrombosis, falls outside of this specific category. While it is indeed a critical condition that can lead to arrest, it is classified under the 5 T's (the other group of reversible causes), which include Tamponade, Tension pneumothorax, Thrombus (pulmonary and coronary), and Toxicities.

The correct answer points to the need for a clear understanding of the distinct classifications of reversible causes of cardiac arrest in ACLS protocols. Recognizing that the 5 H's focus on specific pathophysiological states helps clinicians efficiently diagnose and treat patients experiencing cardiac emergencies.

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Hypovolemia

Hypoxia

Hydrogen ion (acidosis)

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