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Pulse Oximeters

Blood pumped into an already full aorta during ventricular contraction creates a fluid wave that travels from the heart to the peripheral arteries. This recurring wave --- called a pulse -- can be palpated at locations on the body where an artery crosses over bone or film tissue. The pulse is an indicator of how well the blood is circulating. An abnormally slow, rapid, or irregular pulse alters the amount of blood the heart pumps and can affect the ability to meet the tissues' demand for nutrients.
Taking a patient's pulse involves determining the number of beats per minute (the pulse rate), the pattern or regularity of the beats (the rhythm), and the volume of blood pumped (strength) with each beat.

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