What are the Reversible Causes of Cardiac Arrest

CPR Education
1 min readMar 13, 2024

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Image: Hs and Ts of ACLS

Cardiac arrest is a life-threatening condition that demands prompt intervention, and understanding its reversible causes is critical for effective treatment. Referred to as the “H’s and T’s,” these factors encompass various medical conditions and circumstances that, when promptly addressed, can potentially reverse the cardiac arrest.

From oxygen deprivation (Hypoxia) and low blood volume (Hypovolemia) to imbalances in electrolytes like potassium (Hypo/Hyperkalemia) and the presence of toxins, recognizing and targeting these specific issues enhances the chances of successful resuscitation and underscores the importance of comprehensive emergency medical care.

One of the reversible causes of cardiac arrest is an underlying medical condition known as the “H’s and T’s.” These include:

  1. Hypoxia: Lack of oxygen.
  2. Hypovolemia: Low blood volume.
  3. Hydrogen Ion (Acidosis): Excess acidity in the blood.
  4. Hypo/Hyperkalemia: Imbalances in potassium levels.
  5. Hypothermia: Low body temperature.
  6. Toxins: Ingestion of poisons or exposure to toxins.
  7. Tamponade (Cardiac): Compression of the heart by fluid.
  8. Tension Pneumothorax: Air buildup in the chest, compressing the heart.
  9. Thrombosis (Pulmonary or Coronary): Blood clot in the lungs or coronary arteries.
  10. Trauma: Physical injury to the chest or heart.

Identifying and addressing these reversible causes can improve the chances of successfully resuscitating a person experiencing cardiac arrest. More here.

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CPR Education
CPR Education

Written by CPR Education

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CPR Education is a comprehensive blog created to educate general public about CPR and BLS by Heart Start CPR (an emergency training school in San Ramon).

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