Name three Hs in the ACLS Hs and Ts mnemonic.

Name three Hs in the ACLS Hs and Ts mnemonic.

• A. Hypovolemia, Hypoxia, Hydrogen ion (acidosis)
• B. Hypovolemia, Hypoxia, Hypothermia
• C. Hydrogen ion, Hypothermia, Hyperkalemia
• D. Hypovolemia, Hypoxia, Hyperkalemia

Answer: (A)

In ACLS, focusing on reversible causes during resuscitation helps guide what to fix to improve outcomes. Among the Hs, three classic ones are hypovolemia, hypoxia, and hydrogen ion (acidosis). Hypovolemia means there isn’t enough circulating volume from bleeding or fluid loss, so restoring fluids or blood and stopping the source of loss can improve preload and circulation. Hypoxia indicates insufficient oxygen delivery, so securing the airway and providing adequate oxygen (with airway support as needed) is essential to restore oxygenation and help ROSC. Hydrogen ion refers to acidosis, which impairs heart function and the heart’s response to medications; correcting ventilation to remove CO2 and addressing the underlying cause helps improve the heart’s ability to respond during resuscitation. Other Hs can be recognized in various guidelines, such as hypothermia or electrolyte disturbances, but the trio of hypovolemia, hypoxia, and acidosis is a core, high-yield set often highlighted in questions like this.

In ACLS, focusing on reversible causes during resuscitation helps guide what to fix to improve outcomes. Among the Hs, three classic ones are hypovolemia, hypoxia, and hydrogen ion (acidosis). Hypovolemia means there isn’t enough circulating volume from bleeding or fluid loss, so restoring fluids or blood and stopping the source of loss can improve preload and circulation. Hypoxia indicates insufficient oxygen delivery, so securing the airway and providing adequate oxygen (with airway support as needed) is essential to restore oxygenation and help ROSC. Hydrogen ion refers to acidosis, which impairs heart function and the heart’s response to medications; correcting ventilation to remove CO2 and addressing the underlying cause helps improve the heart’s ability to respond during resuscitation.

Other Hs can be recognized in various guidelines, such as hypothermia or electrolyte disturbances, but the trio of hypovolemia, hypoxia, and acidosis is a core, high-yield set often highlighted in questions like this.