What do the 4H's from the acronym for reversible causes stand for?

The correct answer highlights the reversible causes of cardiac arrest, condensed into the acronym known as the 4H's. This grouping is essential in the context of advanced life support and resuscitation efforts, as it allows responders to quickly identify and treat potentially reversible conditions that could be contributing to the patient's critical state.

The specific components of the answer, which are hypoxia, hypovolaemia, hypo/hyperkalaemia, and hypo/hyperthermia, represent significant physiological issues that can lead to cardiovascular instability and affect the heart's function.

• Hypoxia indicates a lack of oxygen, which is vital for cellular metabolism and proper function of the heart and brain.

• Hypovolaemia refers to a decrease in blood volume, which can lead to inadequate perfusion of organs and tissues.

• Hypo/hyperkalaemia encompasses both low and high serum potassium levels, both of which can cause serious arrhythmias or cardiac arrest. Potassium plays a crucial role in maintaining electrical activity in the heart.

• Hypo/hyperthermia addresses critically low or high body temperatures, which can also affect heart function and the body's overall ability to manage stress.

By identifying these reversible causes promptly, healthcare