What does a 'weak/thread pulse' indicate?

A weak or thread pulse indicates possible shock because it reflects inadequate blood circulation, which can occur for various reasons, including significant blood loss, dehydration, or severe infection. This type of pulse signifies that the heart is not pumping effectively or that the blood volume is low, leading to a reduced perfusion to the extremities. In cases of shock, the body prioritizes blood flow to vital organs, which may further weaken peripheral pulses.

In contrast, a strong pulse typically indicates good circulation and healthy cardiac function, while a healthy heart function would be characterized by a regular and strong pulse. High blood pressure is often associated with a strong pulse as well, depending on other clinical factors. Therefore, a weak or thread pulse primarily alerts responders to a serious and potentially life-threatening condition requiring immediate medical attention.