Mercury sphygmomanometer contains a long column of mercury each line on gauge represents 2 mm of mercury place on a flat level surface or mounted on the wall level of mercury should be at 0
Aneroid sphygmomanometer Round gauge Each line on gauge represents 2 mm of mercury pressure
Factors to follow for accurate readings American Heart Association recommendations –Patient should sit quietly for at least 5 minutes before the B/P is taken –Two separate readings should be taken and averaged –Minimum wait of 30 seconds between readings
PROPER SIZE B/P CUFFS SHOULD BE THE SAME DIAMETER AS OF THE PATIENTS ARM
PROPER SIZE SMALL CUFFS RESULTS IN FALSELY HIGH READINGS LARGE CUFF MAY CAUSE FALSELY LOW READINGS
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