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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.

You may or may not notice atrial fibrillation. It often occurs with no signs or symptoms. If you do have symptoms, you may notice something that occurs only occasionally. Or, your symptoms may be frequent or serious.

Arrhythmia is caused by changes to heart tissue. It can also occur suddenly as a result of exertion or stress, imbalances in the blood, medicines, or problems with electrical signals in the heart. Typically, an arrhythmia is set off by a trigger, and the irregular heartbeat can continue if there is a problem in the heart. Sometimes the cause of an arrhythmia is unknown.

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.

If you have known risk factors for developing an aortic aneurysm, your doctor may recommend screening. To screen for an aortic aneurysm, your doctor may recommend an imaging study to look at and measure the aorta. An aneurysm can develop and grow without any symptoms until it ruptures or dissects—events that are both life-threatening. If the aneurysm is found early, treatment or surgery may slow its growth and prevent rupture or dissection.

Angina happens when your heart muscle does not get enough oxygen-rich blood. Medical conditions, particularly ischemic heart disease, or lifestyle habits can cause angina. To understand the causes of angina, it helps to understand how the heart works.

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

Sickle Cell Disease – Screening and Prevention People who do not know whether they carry an abnormal hemoglobin gene can ask their doctor to have their blood tested. Sickle Cell Anemia, Hemoglobin S or SS disease, Sickling disorder due to hemoglobin S

Causes of cardiogenic shock include heart attack and other heart problems, problems outside of the heart, and medicines or procedures. A heart attack is the most common cause because it can damage the heart’s structure in different ways. Less often, a problem elsewhere in the body blocks blood flow coming into or out of the heart and leads to cardiogenic shock.

Your doctor may use diagnostic tests or procedures before CABG to determine how serious your ischemic heart disease is and where the coronary arteries are narrowed. If you need CABG, talk to your doctor about how to prepare for the procedure.

Treatment for bleeding disorders will vary depending on the disorder and may include medicines and factor replacement therapy. Your treatment may be every day to prevent bleeding episodes, or as needed when you plan for surgery or have an accident. You may not need treatment if your bleeding disorder is mild.

Signs, symptoms, and complications may differ depending on the type of bleeding disorder, its cause, and whether the disorder is mild or more serious. Signs and symptoms may be obvious soon after a child is born or not until adulthood. People who have a mild bleeding disorder may not have any signs or symptoms until they are injured or have a medical procedure.

Your doctor will check your medical history, perform a physical exam, and do tests and procedures to diagnose cardiogenic shock. Tests are usually done after you have been admitted to a hospital for a possible heart attack or symptoms of shock. If the reason for the shock is that the heart is not pumping strongly enough, then the diagnosis is cardiogenic shock.

The exact cause of asthma is unknown, and the causes may vary from person to person. However, asthma is often the result of a strong response of the immune system to an allergen in the environment.

RDS is a type of neonatal respiratory disease that is caused most often by a lack of surfactant in the lungs. A fetus's lungs start making surfactant during the third trimester of pregnancy, or weeks 26 through labor and delivery. Surfactant coats the insides of the air sacs, or alveoli, in the lungs. This helps keep the lungs open so breathing can occur after birth.