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2023年8月18日 · In November 2021, the World Health Organization (WHO) first identified the Omicron mutation of the COVID-19 virus as a variant of concern. It quickly became the most common strain worldwide. Since...
- Pathophysiology
- Significance
- Signs and symptoms
- Overview
- Prognosis
A blood pressure reading appears as two numbers. The first and higher of the two is a measure of systolic pressure, or the pressure in the arteries when the heart beats and fills them with blood. The second number measures diastolic pressure, or the pressure in the arteries when the heart rests between beats.
Optimal blood pressure is less than 120/80 (systolic/diastolic). In healthy people, low blood pressure without any symptoms is not usually a concern and does not need to be treated. But low blood pressure can be a sign of an underlying problem -- especially in the elderly -- where it may cause inadequate blood flow to the heart, brain, and other vi...
Chronic low blood pressure with no symptoms is almost never serious. But health problems can occur when blood pressure drops suddenly and the brain is deprived of an adequate blood supply. This can lead to dizziness or lightheadedness. Sudden drops in blood pressure most commonly occur in someone who's rising from a lying down or sitting position t...
Postural hypotension is considered a failure of the cardiovascular system or nervous system to react appropriately to sudden changes. Normally, when you stand up, some blood pools in your lower extremities. Uncorrected, this would cause your blood pressure to fall. But your body normally compensates by sending messages to your heart to beat faster ...
The risk of both low and high blood pressure normally increases with age due in part to normal changes during aging. In addition, blood flow to the heart muscle and the brain declines with age, often as a result of plaque buildup in blood vessels. An estimated 10% to 20% of people over age 65 have postural hypotension.
2021年11月12日 · If your calcium levels are too high or too low, you may need a parathyroid hormone blood test to learn why. Tiny parathyroid glands in your neck may be making too much or too little hormone to ...
2023年10月22日 · Hypothermia is a possibly dangerous drop in body temperature, usually caused by long exposure to cold temperatures. This is more likely to happen when the winter months arrive. But if you're...
2023年11月8日 · Hyperglycemia, or high blood sugar, is a serious problem if you have diabetes. Know the causes and ways to prevent this condition.
2023年10月12日 · What Do the Test Results Mean? 3 min read. An ApoB test helps your doctor analyze whether or not you are at risk for heart disease . It measures the amount of apolipoprotein B in your blood....
2020年8月17日 · These simply represent the average weight, height, or head circumference of a bunch of normal children. You will see the percentile lines on the chart running parallel to each other. The percentile...
