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2012年11月9日 · According to Spencer, an SPF 15 product blocks about 94% of UVB rays; an SPF 30 product blocks 97% of UVB rays; and an SPF 45 product blocks about 98% of rays. "After that, it just gets silly," he...
2023年12月25日 · 6 min read. What Are Premature Ventricular Contractions (PVCs)? If your heart feels out of rhythm or “flutters,” especially when you're anxious or stressed, it could be caused by premature...
2023年4月7日 · 3 min read. Blood pressure is the way that you measure how fast your blood pumps against your inner arteries. It is vital for people of all ages, especially older adults, to monitor their blood...
2024年3月3日 · Your heart rate is a measure of the number of times your heart beats in a minute. With each beat, your heart squeezes. That creates enough pressure to push blood out of your heart to the rest of...
- 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.
2017年5月15日 · What Is Isolated Systolic Hypertension? Medically Reviewed by James Beckerman, MD, FACC on May 15, 2023. Written by Matt Smith. What Problems Can It Cause? Who Gets Isolated Systolic...
2022年7月11日 · Atrial fibrillation, also called AFib, is a complex condition with many causes. Blood pressure problems are just one of the risk factors. But atrial fibrillation itself can lead to changes in blood...
