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Mitral vs. Aortic Murmurs

ACLS Certification Association videos have been peer-reviewed for medical accuracy by the ACA medical review board.

Article at a Glance

  • Valvular stenosis and valvular regurgitation are the two types of heart valve problems.
  • When patients have heart valve problems, usually the aortic or mitral valve is involved.
  • Clinicians will learn the difference between murmurs from mitral valvular disease versus aortic valvular disease.

Overview of Heart Valve Problems

Two valve problems are stenosis and regurgitation.

  • Valvular Stenosis is a stiffening of heart valves that narrow the valve opening size. The valve is closed when it is supposed to be open, so blood can’t flow through. 
  • Valvular Regurgitation is a backflow of blood when the valve is supposed to be closed. The valve is open when it is supposed to be closed. 

The mitral valve and aortic valves are on the left side of the heart. When patients have valve issues, it is usually the aortic valve, mitral valve, or both.

Mitral valve and aortic valve - heart diagram.

The mitral and aortic valve are located on the left side of the heart.


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Mitral Valve Murmurs

The mitral valve is between the left atrium and left ventricle. It allows blood to flow passively down from the left atrium into the left ventricle during diastole. The following describes common mitral valve murmurs.


Related Video – Heart Murmurs Overview (Heart Murmur Series)


Mitral Valve Stenosis

Mitral valve stenosis occurs when a mitral valve is closed while it should be open during diastole. If a patient has mitral valve stenosis, the murmur is diastolic.

Mitral Valve Regurgitation

A mitral valve regurgitation occurs when a mitral valve is open, allowing backflow of blood while it should be closed, such as during systole. Therefore, a mitral valve regurgitation murmur is a systolic murmur.

Stenosis and regurgitation involving the mitral valve - diagram of the heart.

An example of stenosis and regurgitation involving the mitral valve.

Aortic Valve Murmurs

The aortic valve is situated between the left ventricle and the aorta. It should open during systole, allowing blood to flow out to the body.

Diagram showing diastole and systole action of the human heart.

Diastole is the filling of the heart. Systole is the pumping of the heart.

Aortic Valve Stenosis

Aortic valve stenosis occurs when an aortic valve is closed when it should be open. An aortic valve stenosis murmur is a systolic murmur.


Related Video – Aortic Stenosis – Part 1 (Heart Murmur Series)


Aortic Valve Regurgitation

Aortic valve regurgitation occurs when an aortic valve is open when it should be closed during diastole. The aortic valve regurgitation murmur is diastolic.

Summary

The two main types of heart valve problems are valvular stenosis and valvular regurgitation. They typically happen in either the aortic or mitral valve. Depending on the valve and problem type, heart murmurs present in different areas of the patient.

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