Heart Murmur
Definition
A heart murmur is a sound made by turbulent blood flow in the
heart. Some heart murmurs may be harmless. Others may be a sign of a heart problem.
Causes
Harmless murmurs are caused by the normal flow of blood. The murmur may come and go over time. Increased blood flow can increase the murmur sound. The murmur may be louder with:
Abnormal heart murmurs can be due to:
- Structural problems with the heart valves. These are the most common issues. They
may have been present from birth or happened later in life. Examples include:
-
Septal defects, or a hole in the heart's
inside wall
-
Patent ductus-arteriosus, an abnormal
connection between major blood vessels near the heart
- Other issues present from birth such as:
- Changes to the heart because of heart attack,
heart failure, or long-standing
high blood pressure
-
Endocarditis, an infection of the inner
lining of heart valves and chambers
-
Rheumatic
fever,which can cause inflammation and heart valve damage. This can
happen if strep throat is not treated properly.
- Cardiac myxoma, a benign soft tumor within the heart. This is rare.
Risk Factors
Normal heart murmurs are more common in children 3 to 7 years old. Pregnant women are also at increased risk.
The risk for abnormal heart murmurs increases with any of the conditions listed above.
Symptoms
Harmless heart murmurs usually do not cause symptoms. A person
with an abnormal heart murmur may have:
- Rapid breathing or trouble breathing
- Blue lips
- Lightheadedness and/or fainting
- Chest pain
- Rapid or irregular heartbeat
- Exercise intolerance
- Problems gaining weight (in kids)
- Belly swelling
- Enlarged neck veins
Diagnosis
Most heart murmurs are found during a routine exam. The murmur
can be heard with a stethoscope. More tests will be done for murmurs that are causing
problems. Blood tests may be done to rule out other problems. Images may be taken of the
heart. This can be done with:
The heart's electrical activity may also be tested. This can be done with an
ECG.
Treatment
Harmless heart murmurs do not need treatment.
Treatment for abnormal heart murmurs will be based on the cause.
Treating the cause may decrease or stop the murmur. The doctor may advise:
Changing some habits like quitting smoking, exercising more, or drinking less
alcohol.Medicine to treat the murmur's cause.
Surgery may be needed if what is causing the murmur is a severe problem. This could
include repairing or replacing a heart valve.
Prevention
A healthy heart may reduce the risk of some abnormal heart murmurs. Steps may include:
Resources
American Heart Association
http://www.heart.org
National Heart, Lung, and Blood Institute
https://www.nhlbi.nih.gov
Canadian Resources
Canadian Cardiovascular Society
http://www.ccs.ca
The College of Family Physicians of Canada
http://www.cfpc.ca
References
Heart murmurs. American Heart Association website. Available
at: http://www.heart.org/en/health-topics/heart-murmurs. Accessed May 16, 2022.
Heart murmurs. American Academy of Family Physician's Family
Doctor website. Available at: https://familydoctor.org/condition/heart-murmurs. Accessed
May 16, 2022.
Heart murmur in children. EBSCO DynaMed website. Available
at: https://www.dynamed.com/condition/heart-murmur-in-children. Accessed May 16, 2022.
Heart murmurs and your child. Kids Health—Nemours Foundation
website. Available at: http://kidshealth.org/en/parents/murmurs.html. Accessed May 13,
2022.
Treatment options. Temple Health website. Available at:
https://www.templehealth.org/services/conditions/heart-murmurs/treatment-options.
Accessed May 16, 2022.