Define "agonal breathing."

Agonal breathing refers to the specific respiratory pattern characterized by gasping or labored breaths, which commonly occurs in patients who are experiencing severe physiological distress, particularly during cardiac arrest. This form of breathing is not effective for ventilation and is often an indication that the patient is on the verge of respiratory failure or has already lost effective respiratory function.

In the context of cardiac arrest, the presence of agonal breaths can signify a critical and life-threatening situation, requiring immediate intervention, such as chest compressions and rescue breathing. It is a reflexive response rather than a conscious effort to breathe and is typically seen when there is an inadequate supply of oxygen to the brain or when the body's ability to maintain effective respiration is compromised. Understanding this can aid in the prompt recognition of life-threatening emergencies and the initiation of appropriate care measures.