In Class 4 hypovolemic shock, the pulse is greater than?

In Class 4 hypovolemic shock, the pulse is greater than?

• A. Greater than 100 bpm
• B. Greater than 140 bpm
• C. Greater than 120 bpm
• D. Greater than 160 bpm

Answer: (B)

In severe blood loss (Class IV hypovolemic shock), the body’s strongest compensatory response kicks in to preserve perfusion: the heart rate climbs rapidly to maintain cardiac output despite a very low preload. This leads to a pulse that is typically greater than 140 beats per minute. Remember that a normal resting heart rate is about 60–100 bpm, and tachycardia progresses with increasing blood loss: mild loss may yield modest increases, while extreme loss pushes the rate above 140 bpm. So the key threshold clinicians use for Class IV is a pulse exceeding 140 bpm, signaling life-threatening hypovolemia.

In severe blood loss (Class IV hypovolemic shock), the body’s strongest compensatory response kicks in to preserve perfusion: the heart rate climbs rapidly to maintain cardiac output despite a very low preload. This leads to a pulse that is typically greater than 140 beats per minute. Remember that a normal resting heart rate is about 60–100 bpm, and tachycardia progresses with increasing blood loss: mild loss may yield modest increases, while extreme loss pushes the rate above 140 bpm. So the key threshold clinicians use for Class IV is a pulse exceeding 140 bpm, signaling life-threatening hypovolemia.