Mercury Sphygmomanometer
Mercury Sphygmomanometer - Related Videos
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Physiology of the Circulatory System - Student Protocol
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2019
Measuring Circulatory System Function in Humans ExpandBefore starting the experiment go to the front of the room and collect an alcohol swab, a sphygmomanometer, and a stethoscope. Clean the earpieces with the alcohol swab and then insert them into your ears. To check if the stethoscope is in the on position, gently tap the flat metal disc called the diaphragm. If you hear a sound it's on. If not, turn the metal disc and tap again and keep turning and tapping the disc until you hear a sound.
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Physiology of the Circulatory System - Concepts
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Homeostasis Conditions in the external environment of an organism can change rapidly and drastically. To survive, organisms must maintain a fairly constant internal environment, which involves continuous regulation of temperature, pH, and other factors. This balanced state is known as homeostasis, which describes the processes by which organisms maintain their optimal internal conditions. To maintain homeostasis, organisms have developed structures with distinct functions. Physiology is the...
FAQs
The first Korotkoff sounds heard during controlled cuff deflation indicate systolic pressure, while the disappearance of these sounds indicates diastolic pressure. The clinician correlates each acoustic event with the height of the mercury column at that moment. This links the physical changes in brachial artery blood flow to numerical pressure readings.
Inflating the cuff around the upper arm applies external pressure that temporarily occludes the brachial artery. As pressure is released, blood flow changes produce Korotkoff sounds that can be detected with a stethoscope. The cuff therefore creates the controlled pressure conditions needed to identify the systolic and diastolic points during measurement.
Cuff placement, patient positioning, and accurate technique strongly influence the reliability of a reading. The cuff must be positioned around the upper arm, and deflation must remain controlled while the clinician listens for Korotkoff sounds. Attention to these conditions helps ensure that the mercury column corresponds appropriately to the patient’s arterial pressure.
The clinician positions the patient and places the inflatable cuff around the upper arm over the brachial artery region. The cuff is inflated to occlude the artery, then deflated in a controlled manner while a stethoscope detects Korotkoff sounds. The mercury column is read when the relevant sounds first appear and later disappear.
Reliable measurement begins with appropriate patient positioning and correct placement of the cuff on the upper arm. These conditions support consistent occlusion of the brachial artery and accurate listening for Korotkoff sounds. Poor positioning or misplaced equipment can reduce measurement reliability, making careful preparation an essential part of the clinical procedure.
Despite concerns about mercury hazards, the instrument remains important because it has traditionally served as a reference standard for blood-pressure assessment. Clinicians use it for teaching measurement technique, validating automated monitors, and supporting clinical measurement standards. Its role is therefore especially relevant when comparing alternative devices or establishing dependable measurement practices.