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Heart rate during haemorrhagic shock.
1Department of Anaesthesia, Rigshospitalet, University of Copenhagen, Denmark.
Clinical Physiology (Oxford, England)
|November 1, 1992
Summary
Reversible hypovolemic shock shows a low heart rate (around 80 bpm). Tachycardia (around 120 bpm) indicates severe blood loss and may signal irreversible shock.
Area of Science:
- Emergency Medicine
- Critical Care
- Physiology
Background:
- Hemorrhagic shock is a life-threatening condition characterized by significant blood loss.
- Monitoring vital signs like heart rate and mean arterial pressure is crucial for assessing shock severity.
- Understanding the relationship between blood loss and physiological responses aids in timely intervention.
Purpose of the Study:
- To investigate the correlation between estimated blood loss and vital signs during hemorrhagic shock resuscitation.
- To differentiate between reversible and potentially irreversible stages of hypovolemic shock based on heart rate and mean arterial pressure.
Main Methods:
- Prospective study involving 34 patients undergoing resuscitation from hemorrhagic shock.
- Measurement of heart rate and mean arterial pressure in relation to estimated blood loss.
- Categorization of patients based on blood loss volume ( 3L).
Main Results:
- Patients with < 3L blood loss (34% of blood volume) had a median heart rate of 83 bpm and MAP of 62 mmHg.
- Patients with > 3L blood loss (89% of blood volume) exhibited a significantly higher median heart rate of 120 bpm (P < 0.05) and lower MAP of 52 mmHg (P < 0.05).
- Non-survivors (n=6) had a median heart rate of 129 bpm and MAP of 40 mmHg.
Conclusions:
- Reversible hypovolemic shock is associated with a heart rate of approximately 80 bpm.
- Tachycardia (around 120 bpm) signifies profound bleeding and may indicate a transition to irreversible shock.
- Heart rate and mean arterial pressure are key indicators for assessing shock severity and prognosis.