At what body temperature does cardiac irritability begin?

Cardiac irritability begins to develop at a body temperature of 33°C (91.4°F). At this temperature, there is a notable risk of arrhythmias due to the effects of hypothermia on cardiac function. As the body's temperature drops, the normal electrical conduction pathways of the heart can become disturbed, leading to increased excitability and potentially dangerous heart rhythms.

Understanding the physiological impacts of temperature on the heart is crucial for tactical paramedics who may encounter patients with hypothermia. Recognizing that significant alterations in heart function start at this specific temperature can guide interventions and prioritization of care. Furthermore, it highlights the importance of maintaining normothermia in emergency situations to prevent complications associated with low body temperatures.