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In a 12-lead ECG, all leads except the limb leads are assumed to be unipolar (aVR, aVL, aVF, V 1, V 2, V 3, V 4, V 5, and V 6). The measurement of a voltage requires two contacts and so, electrically, the unipolar leads are measured from the common lead (negative) and the unipolar lead (positive).
In medicine, the pulse is the rhythmic throbbing of each artery in response to the cardiac cycle (heartbeat). [1] The pulse may be palpated in any place that allows an artery to be compressed near the surface of the body, such as at the neck (carotid artery), wrist (radial artery or ulnar artery), at the groin (femoral artery), behind the knee (popliteal artery), near the ankle joint ...
This short sharp change in pressure is rapidly attenuated down the arterial tree. The pulse wave form is also reflected from branches in the arterial tree and gives rise to a dicrotic notch in main arteries. The summation of the reflected pulse wave and the systolic wave may increase pulse pressure and help tissue perfusion.
Edwin Smith Papyrus (c. 1500 BCE) - Earliest mention of the brain; the pulse; the role of the heart in circulating blood, but not complete circulation. [1] It is the world's oldest surgical textbook, [2] containing descriptions of the zygomatic bone, dura mater, cerebrospinal fluid, and nasal cavity. [2] Brugsch Papyrus (c. 1200 BCE)
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Palpation is the process of using one's hands to check the body, especially while perceiving/diagnosing a disease or illness. [1] Usually performed by a health care practitioner, it is the process of feeling an object in or on the body to determine its size, shape, firmness, or location (for example, a veterinarian can feel the stomach of a pregnant animal to ensure good health and successful ...
Diet and lifestyle can also play a part. "Very low levels of sodium in the body, extreme sleep deprivation , very low blood sugar or alcohol withdrawal can trigger sporadic seizures," says Shih.
Shock is the state of insufficient blood flow to the tissues of the body as a result of problems with the circulatory system.Initial symptoms of shock may include weakness, tachycardia, hyperventilation, sweating, anxiety, and increased thirst. [1]