Congestive heart failure, also known as CHF, is a condition in which a weakened heart cannot pump enough blood to body organs. Since the pumping action of the heart is reduced, blood backs up into certain body tissues.
CHF can be caused by any of a number of complex problems that cause the pumping chambers of the heart to fail.
The heart is divided into a left heart and right heart. In a healthy heart, the right heart receives oxygen-poor blood from the body and pumps it to the lungs. The blood receives a fresh supply of oxygen as it passes through the lungs. The oxygen-rich blood is then pumped back into the left heart, which pumps it out to the rest of the body.
If the pumping chambers of the heart do not function well, blood becomes "backed up"in the lungs or in the tissues of the body, making them congested with blood and fluid. This is the basis for the name congestive heart failure. In time, the organs and tissues begin to suffer from not getting enough blood and oxygen.
A person with CHF develops shortness of breath, often when lying flat or exercising. Shortness of breath can cause sleep problems or limit the ability to exercise.
Severe swelling of the legs caused by the buildup of blood and fluid in the legs is one of the most common signs of CHF.
As CHF worsens, the person can develop severe fatigue, chest pain, and even shortness of breath while at rest.
CHF can be caused by many diseases and conditions. Coronary heart disease, abbreviated as CHD, is a major cause of CHF. Multiple or severe heart attacks can lead to CHF as heart muscle is damaged. Other risk factors for CHF include: alcohol abusecertain infectious diseases common in underdeveloped countriescongenital heart disease, which are heart defects present at birthdiabetesheart valve damage, such as the scarring from a heart valve infection known as endocarditishigh blood pressurehigh cholesterol levelsobesityan inactive lifestylesmokingsome genetic disorders that lead to heart muscle weakness or malfunction
Prevention of CHF is not always possible. In some cases, controlling the conditions that lead to heart damage can help prevent its progress. For example, effective treatment of high blood pressure can help reduce the risk of CHF. Other prevention measures include: avoiding excess alcohol intakeeating a diet designed to reduce heart diseasegetting regular physical activityquitting smoking, for people who smokekeeping weight in a healthy range
The diagnosis of CHF begins with a careful medical history and physical exam.
CHF can be confirmed by an echocardiogram, which uses ultrasound waves to create a picture of heart muscle and valve function. Nuclear medicine scans may also be ordered.
Cardiac catheterization, is a more invasive procedure that gives a view of the blood flow through the heart. Doctors may also use blood tests to diagnose and to guide treatment.
Left untreated, CHF can cause poor health and early death. But, new advances in treatment can help delay its progress and decrease symptoms.
CHF is not contagious and poses no risk to others.
Many medicines are used to treat CHF, including: Angiotensin-converting enzyme inhibitors, also known as ACE inhibitors or ACEIs. These medicines help reduce the work-load on the heart. Examples of ACE inhibitors include enalapril (i.e., Vasotec), fosinopril (i.e., Monopril), or lisinopril (i.e., Prinivil, Zestril).Angiotensin-receptor blockers (ARBs), such as valsartan (i.e., Diovan) and candesartan (i.e., Atacand), which have similar actions to the ACE inhibitors, and which can be substituted for the ACE inhibitors in the event of a dry cough.Beta-adrenergic blockers, metoprolol (i.e Lopressor, Toprol XL), carvedilol (i.e., CoReg) or bisoprolol (i.e., Zebeta). These medicines help reverse some of the damage to the heart muscle that occurs in heart failure.Beta-adrenergic blockers, ACE inhibitors and angiotensin-receptor blockers have all been shown to prolong survival and reduce complications of CHF and may be combined with one another depending on patient-specific factors.Digoxin (i.e., Lanoxin). This type of medicine the heart muscles beat more strongly.Diuretics. Also known as water pills, this type of medicine helps relieve the buildup of fluid in the tissues. Examples include furosemide (i.e., Lasix), metolazone (i.e., Zaroxolyn), spironolactone (i.e., Aldactone), or triamterene-HCTZ (i.e., Dyazide).Vasodilators such as hydralazine, prazosin (i.e., Minipress), or isosorbide dinitrate (i.e., Dilatrate, Isordil)..
In severe cases, implantable cardiac resynchronization devices can be used. This device stimulates the ventricles, which are the lower chambers of the heart. The device controls the beating of the ventricles so that they beat at the same time. Blood is pumped more efficiently, helping to reduce the effects of CHF.
A left ventricular assist device, called an LVAD, may also be used in severe cases of CHF. An LVAD is a small pump that helps the left ventricle pump more blood through the body. It is generally used to support a person until a heart transplant can be performed.
For some people, a heart transplant is the only treatment that can cure the CHF.
Side effects vary with the medicines used: Diuretics can cause dehydration, salt imbalance and low potassium.ACE inhibitors can cause a chronic dry cough and rarely, a specific type of allergic reaction called angioedema. Too much digoxin can cause serious side effects. These may include vomiting, visual impairment and heart rhythm disturbances.Beta-blockers can cause some mild confusion, dizziness upon standing and fatigue. These side effects are worse when the medicine is first started and generally resolve with time.
Most people with CHF will benefit if they exercise regularly. Every effort should also be made to reduce his or her coronary risk factors.
These actions may include: quitting smoking keeping other diseases and conditions such as diabetes and high blood pressure under good controleating a heart-healthy diet
The healthcare professional may need to adjust the medications until the person achieves the best response.
Periodic exams, blood tests, and imaging studies such as echocardiography are used to monitor CHF. Any new or worsening symptoms should be reported to the healthcare professional.