![]() ![]() For 2001, the annual consumption was estimated at 170-400 pieces corresponding to a mercury consumption of 12-28 kg Hg/year (Skårup et al. Each sphygmomanometer contained about 70 g mercury corresponding to an annual consumption of 20-35 kg Hg/year. The annual consumption of sphygmomanometers in Denmark was estimated at 300-500 pieces in 1994 (Maag et al. The method is used for diagnosing certain kind of arteriosclerosis, a chronic disease in which thickening, hardening, and loss of elasticity of the arterial walls result in impaired blood circulation. The strain gauge technique registers changes in electric conductivity of the mercury in the tube, as the strain gauge is expanded by an increase of the circumference of the body part. The mercury strain gauge consists of a fine rubber tube filled with mercury which is placed around the body part in which the blood pressure or blood flow is measured. Mercury strain gauges are used for blood flow and blood pressure measurements in body parts using a technique called strain gauge plethysmography (from the Greek "plethysmos" for increase: measuring how limbs change in size at different pressures). Mercury sphygmomanometers have been used for more than 100 years and are still considered the "gold standard" of blood pressure measurements. At certain points in the sound pattern, the clinician reads the pressure using the mercury column of the manometer. The method relies on the auscultatory technique, in which a clinician determines systolic and diastolic blood pressures (SBP and DBP) by listening (auscultate) for sounds that characterize different stages of blood flow during cuff deflation (so-called Korotkoff sounds). Two types of mercury-containing devices are used for measuring of blood pressure: mercury sphygmomanometers and mercury stain gauges.Ī mercury sphygmomanometer (from Greek "sphygmos" for pulsation) includes a mercury manometer, an upper arm cuff, a hand inflation bulb with a pressure control valve and requires the use of a stethoscope to listen to the Korotkoff sounds. 5.2 Alternatives for main application areasĥ.1 Application of mercury-containing blood pressure measuring devices.5.1 Application of mercury-containing blood pressure measuring devices.| Front page | | Contents | | Previous | | Next |Īlternatives to mercury-containing measuring devices 5 Blood pressure measuring devices ![]() Environmental Project, 1102 – Alternatives to mercury-containing measuring devices – 5 Blood pressure measuring devices ![]()
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