In haemorrhagic shock, a relatively low heart rate (~80 beats/min) is associated with reversible hypovolaemia, whereas tachycardia (~120 beats/min) indicates profound bleeding and potentially a transition to an irreversible stage.
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Tachycardia may mark profound haemorrhage in shock; hypothesis-generating for HR thresholds predicting irreversibility.
Jacobsen et al. (1992) studied this question.
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