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| Pulse |
| 09.05.07 (9:33 pm) [edit] |
| Pulse In medicine, a people pulse is the painful of their arteries as an consequence of the heart beat. It be able to be felt at the neck (carotid artery), at the wrist (radial artery), behind the knee (Popliteal artery), on the inside of the elbow ( Brachial artery), near the ankle joint (Posterior Tibias artery), and a few other places. Pressure waves move through the blood vessels, which are pliable; these waves are not caused by the forward movement of the blood. When the heart contracts, blood are expelled into the aorta and the aorta stretches. At this point the signal of distention (pulse wave) is pronounced but comparatively slow-moving (3 to 6 m/s). As it travels towards the peripheral blood vessels, it gradually diminishes and becomes faster. In the large arterial twigs, its velocity is 7 to 10 m/s; in the small arteries, it is 15 to 35 m/s. The stress pulse is transmitted 15 or more times more rapidly than the blood flow. The term pulse is also used, although inaccurately, to denote the frequency of the heart beat, typically measured in beats per minute. In most people, the pulse is an accurate measure of heart rate. Under certain circumstances, including arrhythmias, some of the heart beats are ineffective and the aorta is not stretched enough to create a palpable pressure wave. The pulse is irregular and the spirit rate can be (much) higher than the pulse rate. In this container, the heart rate should be determined by auscultation of the heart apex, in which case it is not the pulse. The pulse deficit (difference between heart beats and pulsations at the periphery) should be determined by simultaneous palpation at the radial artery and auscultation at the heart apex. A normal pulse rate for a healthy adult, while resting, can range from 60 to 100 beats per minute (BPM). During sleep, this can drop to as low as 40 BPM; during strenuous exercise, it can rise as high as 200–220 BPM. Generally, pulse rates are higher in younger persons. A resting heart rate for an infant is as high as or higher than an adult's pulse rate during strenuous exercise. |