Next Chambers of the Heart The heart is a muscular organ about the size of a fist, located just behind and slightly left of the breastbone. The heart pumps blood through the network of arteries and veins called the cardiovascular system.
The heart has four chambers: The right atrium receives blood from the veins and pumps it to the right ventricle. The right ventricle receives blood from the right atrium and pumps it to the lungs, where it is loaded with oxygen.
The left atrium receives oxygenated blood from the lungs and pumps it to the left ventricle. The left ventricle the strongest chamber pumps oxygen-rich blood to the rest of the body.
The coronary arteries run along the surface of the heart and provide oxygen-rich blood to the heart muscle. A web of nerve tissue also runs through the heart, conducting the complex signals that govern contraction and relaxation.
Surrounding the heart is a sac called the pericardium. Heart Conditions Coronary artery disease: Over the years, cholesterol plaques can narrow the arteries supplying blood to the heart. Narrowed coronary arteries cause predictable chest pain or discomfort with exertion. The blockages prevent the heart from receiving the extra oxygen needed for strenuous activity.
Symptoms typically get better with rest. Chest pain or discomfort that is new, worsening, or occurs at rest. This is an emergency situation as it can precede a heart attack, serious abnormal heart rhythm, or cardiac arrest.
Myocardial infarction heart attack: A coronary artery is suddenly blocked. Starved of oxygen, part of the heart muscle dies. An abnormal heart rhythm due to changes in the conduction of electrical impulses through the heart. Some arrhythmias are benign, but others are life-threatening. The heart is either too weak or too stiff to effectively pump blood through the body. Shortness of breath and leg swelling are common symptoms.
As a result, the heart's ability to pump blood is weakened. Inflammation of the heart muscle, most often due to a viral infection. Inflammation of the lining of the heart pericardium. Viral infections, kidney failure, and autoimmune conditions are common causes. Fluid between the lining of the heart pericardium and the heart itself. Often, this is due to pericarditis. Abnormal electrical impulses in the atria cause an irregular heartbeat. Atrial fibrillation is one of the most common arrhythmias.
There are four heart valves, and each can develop problems. If severe, valve disease can cause congestive heart failure. An abnormal sound heard when listening to the heart with a stethoscope. Some heart murmurs are benign; others suggest heart disease. Inflammation of the inner lining or heart valves of the heart. Usually, endocarditis is due to a serious infection of the heart valves.
The mitral valve is forced backward slightly after blood has passed through the valve. Death caused by a sudden loss of heart function cardiac arrest. Sudden loss of heart function. Electrocardiograms can help diagnose many heart conditions. An ultrasound of the heart. By using a treadmill or medicines, the heart is stimulated to pump to near-maximum capacity. This may identify people with coronary artery disease.
A catheter is inserted into the femoral artery in the groin and threaded into the coronary arteries. A doctor can then view X-ray images of the coronary arteries or any blockages and perform stenting or other procedures. If a doctor suspects an arrhythmia, a portable heart monitor can be worn.
Called a Holter monitor, it records the heart's rhythm continuously for a 24 hour period. If a doctor suspects an infrequent arrhythmia, a portable heart monitor called an event monitor can be worn. When you develop symptoms, you can push a button to record the heart's electrical rhythm. Continued Heart Treatments Exercise: Regular exercise is important for heart health and most heart conditions. Talk to your doctor before starting an exercise program if you have heart problems. During cardiac catheterization, a doctor inflates a balloon inside a narrowed or blocked coronary artery to widen the artery.
A stent is often then placed to keep the artery open. Percutaneous coronary intervention PCI: During cardiac catheterization, a doctor expands a wire metal stent inside a narrowed or blocked coronary artery to open up the area. This lets blood flow better and can abort a heart attack or relieve angina chest pain.
Thrombolysis is generally only done if stenting is not possible. Statins and other cholesterol lipid lowering drugs reduce the risk for heart attack in high-risk people.
Commonly called water pills, diuretics increase urination and fluid loss. This reduces blood volume, improving symptoms of heart failure. These medicines reduce strain on the heart and lower heart rate. Beta-blockers are prescribed for many heart conditions, including heart failure and arrhythmias. Angiotensin-converting enzyme inhibitors ACE inhibitors: These blood pressure medicines also help the heart after some heart attacks or in congestive heart failure.
This powerful medicine helps prevent blood clots the cause of heart attacks. Most people who have had heart attacks should take aspirin. A clot-preventing medicine that prevents platelets from sticking together to form clots. Clopidogrel is especially important for many people who have had stents placed. These help prevent or control arrhythmias. AED automated external defibrillator: If someone has sudden cardiac arrest, an AED can be used to assess the heart rhythm and send an electrical shock to the heart if necessary.
ICD Implantable cardioverter defibrillator: If a doctor suspects you are at risk for a life-threatening arrhythmia, an implantable cardioverter defibrillator may be surgically implanted to monitor your heart rhythm and send an electrical shock to the heart if necessary. To maintain a stable heart rate, a pacemaker can be implanted.
A pacemaker sends electrical signals to the heart when necessary to help it beat properly.