In an attempt to obliterate observer bias associated with mercury sphygmomanometer^ the Hawksley random-zero sphygmomanometer was introduced. However, evidence suggests that it underestimates blood pressure (O'Brien et al., 1990) and therefore is not a suitable replacement for the mercury sphygmomanometer.
Aneroid devices were also suggested as a mercury-free alternative and are popular for use in the community, as it is easily portable. They are reported to become less accurate over time (Coleman et al., 2005; Waugh et al., 2002) and with extended use. Modern aneroids may use better materials but there are few data assessing them longitudinally. It therefore remains a recommendation to do regular calibration checks to reduce possible error in measurement.
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Your heart pumps blood throughout your body using a network of tubing called arteries and capillaries which return the blood back to your heart via your veins. Blood pressure is the force of the blood pushing against the walls of your arteries as your heart beats.Learn more...