What is the heart rate of a casualty that has lost 2500cc blood?

In cases of significant blood loss, such as 2500cc (or 2.5 liters), the body responds to maintain adequate tissue perfusion and oxygenation. This often results in an increased heart rate, known as tachycardia.

When a person loses around 30-40% of their blood volume, which 2500cc represents for an average adult, their cardiovascular system typically compensates with a higher heart rate. While the exact response can vary based on individual factors and underlying health conditions, a heart rate of 140 beats per minute or higher is indicative of severe compensation mechanisms in response to this level of blood loss.

This compensatory tachycardia is crucial in signaling a potential state of shock. It often reflects the body's attempt to maintain circulation despite the decreased blood volume. Thus, a heart rate of 140+ bpm is the expected physiological response for someone who has experienced such a significant loss of blood.