orthostatic vital signs in blood donors

8 Apr

orthostatic vital signs in 100 blood donors sustaining an acute 450-mL blood loss.

same parameters were measured in the same arm beginning 30 seconds after standing.

orthostatic vital signs was repeated immediately after blood donation.


Mean orthostatic vital sign changes were as follows:

  • pulse rate, 2 ± 7 beats per minute;
  • systolic blood pressure, −3 ± 9 mm Hg;
  • diastolic blood pressure, 1 ± 7 mm Hg.
Not a dramatic change.  Wouln’t really meet most “orthostatic hypotension” vital sign criteria.

Also, for those known to be orthostatic, a pulse rise of >20 beats per minute +/- diastolic blood pressure fall >10mm Hg had high specificity but poor sensitivity.

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