ESTIMATION OF ARTERIAL BLOOD PRESSURE BY VISUAL OBSERVATION OF SPHYGOMOMANOMETER NEEDLE OSCILLATION.
Final rept. Jan-Apr 69,
SCHOOL OF AEROSPACE MEDICINE BROOKS AFB TEX
Pagination or Media Count:
A study of the needle oscillation method of blood pressure measurement was made using 6 normotensive adult females as subjects and observers. The mean systolic values for this method were found to be higher and the mean diastolic values lower than with the conventional Korotkoff method and, therefore, apparently closer to true direct method values. By correcting the average of 2 needle oscillation readings by the difference of the means, it was predicted with 90 confidence that one could expect 75 of the needle oscillation determinations to be within 7.5 mm. Hg systolic and 10.0 mm. Hg diastolic or that 90 would be within 10.7 mm. Hg systolic and 14.7 mm. Hg diastolic of the conventional value. These values are less than, or do not greatly exceed, the acceptable limit of 8 mm. Hg difference established by the American Heart Association for two separate conventional readings. It would appear, therefore, that the oscillation method may have considerable potential value for use in environments with high noise levels where the conventional method cannot be used. A difference was found in the ability of different observers to use this method. The two most accurate observers each made 10 errors in 40 determinations, while the least accurate observer made 17 errors in 40 determinations. Author
- Anatomy and Physiology