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Sleep is a period of rest that alternates with wakefulness. You have internal body clocks that control when you are awake and when your body is ready for sleep. These clocks have cycles of approximately 24 hours. The clocks are regulated by multiple factors, including light, darkness, and sleep schedules. Once asleep, you cycle through the stages of sleep throughout the night in a predictable pattern.

Many factors play a role in preparing your body to fall asleep and wake up. Your body has several internal clocks, called circadian clocks. These typically follow a 24-hour repeating rhythm, called the circadian rhythm. This rhythm affects every cell, tissue, and organ in your body and how they work.

Your doctor may recommend cardiac catheterization to find out what is causing signs or symptoms of a heart problem or to treat or repair a heart problem.

You will meet with your cardiologist, a doctor who specializes in the heart. Your doctor will ask you about your medical history, do a physical exam, give you instructions on how to prepare for the procedure, and may give you some tests or procedures.

After sudden cardiac arrest, surgery to implant an implantable cardioverter defibrillator (ICD), or a fitting for a wearable cardioverter defibrillator (WCD), you will need regular visits with your doctor to check your condition, the device, or any medicines you are taking. You can get an ID card with information about your device to keep with you. It can be helpful in an emergency, to show airport security, or for medical personnel who need to know more about your device. If you have an ICD, be aware of the signs of complications with your device.

Sometimes VTE does not cause symptoms until serious complications occur. In other cases, deep vein thrombosis causes swelling or discomfort near the blood clot. Pulmonary embolism can cause chest pain and difficulty breathing. Pulmonary embolism can be a life-threatening condition.

The TAH replaces the lower chambers of the heart, called ventricles. Tubes connect the TAH to a power source that is outside the body. The TAH then pumps blood through the heart’s major artery to the lungs and the rest of the body.

After being diagnosed with iron-deficiency anemia, it is important to follow your treatment plan, such as taking prescribed iron supplements. You should monitor your condition for new or worsening symptoms. Your doctor may want to repeat blood tests to check that your anemia is improving.

You may have an increased risk for sarcoidosis because of your age, your family history and genetics, or your race. Some risk factors, such as occupation, can be changed. Most risk factors, such as age, family history and genetics, race and ethnicity, and sex, cannot be changed.

There are two types of aortic aneurysms: thoracic aortic aneurysms and abdominal aortic aneurysms.