Mar 19, 2024 · Overview Dural arteriovenous fistulas (dAVFs) are irregular connections between arteries and veins. They occur in the tough covering over the brain or spinal cord, known as the dura mater. …

Jun 4, 2025 · Overview A pacemaker is a small, battery-powered device that prevents the heart from beating too slowly. You need surgery to get a pacemaker. The device is placed under the skin near …

Symptoms Body mass index, also known as BMI, is often used to diagnose obesity. To calculate BMI, multiply weight in pounds by 703, divide by height in inches and then divide again by height in …

Overview A hematocrit (he-MAT-uh-krit) test measures the proportion of red blood cells in the blood. Red blood cells carry oxygen throughout the body. Having too few or too many of them can be a sign …

Sep 27, 2005 · A healthy level of oxygen in the arteries is about 75 to 100 millimeters of mercury (mm Hg). Hypoxemia is any value under 60 mm Hg. Levels of oxygen and the waste gas carbon dioxide …

Apr 20, 2023 · Overview Plague is a serious illness caused by a germ called Yersinia pestis. The germs mostly live in small rodents and their fleas. The most common way for humans to get plague is a flea …

Apr 19, 2023 · Chickenpox is an illness caused by the varicella-zoster virus. It brings on an itchy rash with small, fluid-filled blisters. Chickenpox spreads very easily to people who haven't had the disease …

May 22, 2025 · Overview Autism spectrum disorder is a condition related to brain development that affects how people see others and socialize with them. This causes problems in communication and …

Oct 14, 2022 · Depression is a mood disorder that causes a persistent feeling of sadness and loss of interest. Also called major depressive disorder or clinical depression, it affects how you feel, think …

Mar 8, 2024 · Cellulitis isn't usually spread from person to person. Cellulitis is an infection of the deeper layers of the skin most commonly caused by bacteria that normally live on the skin's surface. You …