Which type of bleeding typically requires immediate application of a tourniquet due to its severity?

Arterial bleeding is characterized by bright red blood that spurts from the wound, typically in time with the heartbeat. This type of bleeding is particularly severe because it indicates that a major artery has been damaged, which can lead to rapid blood loss and significant risk to life if not controlled immediately. The pressure of blood flow from arteries is much higher than that in veins or capillaries, making it imperative to address arterial bleeding without delay.

A tourniquet is often applied to occlude blood flow and help prevent potentially fatal blood loss. The urgency in treating arterial bleeding is such that immediate action is required to stabilize the patient and reduce the risk of shock or death. In contrast, other types of bleeding, such as venous or minor bleeding, typically do not pose the same level of immediate danger and can often be managed with direct pressure or other less invasive measures.