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Congestive Heart Failure

Description

An in-depth report on the causes, diagnosis, treatment, and prevention of CHF.

Alternative Names

Cardiomyopathy; Heart Failure

Risk Factors

Nearly five million Americans currently suffer from heart failure, and about 550,000 new cases of heart failure are now diagnosed each year. In 1970 there were only 250,000 new cases, so the annual numbers have risen dramatically. Nevertheless, such numbers represent an increasingly older population. According to a 2002 study, the actual risks for men are stable and for women they may even be declining. In addition, the risk for death after heart failure is diagnosed has declined by 12% every decade. The study was limited, however. Subjects were nearly all Caucasian and they had access to good preventive health care. In general, because diabetes and obesity are at epidemic levels, experts have expected heart failure rates to increase.

Advancing Age

Heart failure is the most common reason for hospitalization in the elderly, and as the population ages, the incidence of congestive heart failure is rising dramatically. According to one report, it occurs at a rate of about 10 per 1,000 people after age 65. The positive implication of that report, however, is that people are living longer with heart failure.

Male Gender

Men are at higher risk for heart failure than women, although the difference narrows with age. Women also have a better survival rate than men do when heart failure is caused by valvular heart disease, high blood pressure, or alcohol abuse. (Some studies indicate that this is because men may be more susceptible to the process of heart muscle-cell remodeling, a damaging effect of hypertension.)

The survival rates of women and men are more similar, however, when heart failure evolves from coronary artery disease or heart attack. In fact, women are much more likely to develop heart failure after a heart attack than men. In such cases, some evidence suggests that the reasons for this may include less aggressive approach to treatment for the initial heart conditions.

African-American Ethnicity

African-Americans are at higher risk for heart failure than are Caucasians, and studies have reported that they tend to do much worse. In a 2003 study, however, in which Caucasians and African-Americans had comparable treatment, African-Americans actually had lower one-year mortality rates (with slightly higher rates of rehospitalizations). Still, more studies are needed to determine if there are actual biologic differences in specific patients. Some evidence, for example, suggests that African-Americans are more often likely than Caucasians to develop diastolic heart failure (a failure of the heart muscle to relax normally), which is often a precursor to systolic heart failure (impaired ability to pump blood). Caucasians tend to develop systolic heart failure first. In one study comparing Caucasian and African-Americans who only had diastolic heart failure, African-Americans had a 30% higher mortality rate.

Family History and Genetics

A family history of early congestive heart failure caused by cardiomyopathies (diseases that damage the heart muscle) may predispose people to the disease. Researchers are also looking for changes in specific genes that might regulate systems involved in heart failure and so increase susceptibility in certain populations.

Chronic Alcohol Abuse

Chronic alcohol abuse can damage the heart muscles, can cause hypertension, and may prove to be one cause of idiopathic dilated cardiomyopathy. Moderate alcohol consumption, on the other hand (generally defined as two drinks a day for men and one for women), may protect against heart failure. Teetotalers, though, are not advised to begin drinking.

Medical Conditions that Increase the Risk for Heart Failure

  • Coronary artery disease. More than 60% of the cases of congestive heart failure in the United States may be due to coronary artery disease and any of its risk factors (smoking, sedentary living, obesity).
  • Heart attack. The injured heart after at an attack is at high risk for failure. Therefore, the improved survival rates from heart attack over the past decades have actually been responsible for the dramatic increase in heart failure rates.
  • High blood pressure. Hypertension is a significant risk factor and is present in 75% of heart failure patients. (One study suggested that people with hypertension who suffer from depression are at particular risk for heart failure, possibly because depression affects the nervous system involved in regulating the heart.)
  • Diabetes. People with diabetes are at high risk for heart failure, particularly if they also have coronary artery disease. Indeed, even blood sugar abnormalities that presage diabetes increase the risk.
  • Obesity. Obesity is associated with both hypertension and type 2 diabetes--conditions that place people at risk for heart failure. New evidence strongly suggests that obesity itself is a major risk factor for heart failure, particularly in women. In a major 2002 study, about 14% of heart failure cases in women and 11% in men could be attributed to obesity. Both overweight and obese women had a significantly higher than normal risk for heart failure. Only obesity conferred a significant risk in men.
  • Valvular heart disease. Specific valvular conditions that are common in heart failure patients include aortic stenosis and mitral regurgitation.
  • Severe emphysema. This chronic lung disease is a major risk factor for right-side heart failure.
Emphysema
Emphysema is a lung disease involving damage to the air sacs (alveoli).There is progressive destruction of alveoli and the surrounding tissue that supports the alveoli. With more advanced disease, large air cysts develop where normal lung tissue used to be. Air is trapped in the lungs due to lack of supportive tissue which decreases oxygenation.
  • Cardiomyopathies due to various causes, including birth defects, HIV infection, and other infections.
  • In rare cases, heart failure can occur in women around the time of childbirth, a condition called peripartum cardiomyopathy.
Click the icon to see an image of peripartum cardiomyopathy.
  • An overactive thyroid (hyperthyroidism) can have severe effects on the heart and increase the risk for heart failure.
  • Amyloidosis. With this disease, a starchy protein (amyloid) builds up in tissues and organs, can lead to congestive heart failure.
  • Surviving childhood cancers. Survivors now face a risk for developing congestive heart failure in later years, particularly those treated with certain chemotherapies, such as doxorubicin. Newer cancer advances may reduce this risk.
  • Acute myocarditis. This rare viral infection involves the heart muscle and can produce temporary but potentially life-threatening heart failure.

Medications and Other Factors Associated with Heart Failure

Thiamin (a vitamin B) deficiency can lead to reversible cardiomyopathy. Long-term use of anabolic steroids (male hormones used to build muscle mass) increases the risk for heart failure. The drug itraconazole (Sporanox), taken orally for skin, nail, or other fungal infections, has been linked to heart failure in a small number of cases.

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