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Heart Sounds Library

Thinklabs One Digital Stethoscope

The Heart Sounds Library is a reference collection curated by the Thinklabs Community, captured on Thinklabs stethoscopes, and recorded on smartphones


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Normal Heart Sound- normal speed

LISTEN WITH HEADPHONES. Recording made with a Thinklabs One Digital Stethoscope. A normal heart sound showing S1 and S2. No audible murmurs.
 
Contributor: Thinklabs Medical 

Normal Heart Sound- slow

LISTEN WITH HEADPHONES. Recording made with a Thinklabs One Digital Stethoscope and slowed down 50% for learning purposes. A normal heart sound showing S1 and S2. No audible murmurs.
 
Contributor: Thinklabs Medical 

Aortic Regurgitation- normal speed

 

LISTEN WITH HEADPHONES. Recording made with a Thinklabs One Digital Stethoscope. Murmur best heard with patient sitting forward, Stethoscope in bell mode positioned over the second intercostal space to the right of right of the sternal border, or over the 3rd - 4th intercostal space just to the left of the sternal border. Murmur is enhanced during expiration.
 
Note that the aortic component of the second heart sound is soft.
The characteristic murmur is an early diastolic murmur. The intensity is loudest at the onset of diastole and becomes softer during diastole - the so-called "decrescendo" murmur.
 
Contributor: Dr. Darryl A Smith FCP (SA) Cardiology

Aortic Regurgitation- slow

LISTEN WITH HEADPHONES. Recording made with a Thinklabs One Digital Stethoscope and slowed down 50% for learning purposes. Murmur best heard with patient sitting forward, Stethoscope in bell mode positioned over the second intercostal space to the right of right of the sternal border, or over the 3rd - 4th intercostal space just to the left of the sternal border. Murmur is enhanced during expiration.
 
Note that the aortic component of the second heart sound is soft.
The characteristic murmur is an early diastolic murmur. The intensity is loudest at the onset of diastole and becomes softer during diastole - the so-called "decrescendo" murmur.
 
Contributor: Dr. Darryl A Smith FCP (SA) Cardiology

Aortic Regurgitation, Ejection Systolic Murmur- normal speed

LISTEN WITH HEADPHONES. Recording made with a Thinklabs One Digital Stethoscope. The stethoscope is positioned towards the left sternoclavicular junction. Note in this recording the ejection systolic murmur early in systole. The aortic regurgitant murmur is less prominent in this position. Patients with aortic valvular disease may have concomitant aortic stenosis and aortic regurgitation, or may have isolated aortic regurgitation.
This patient had isolated aortic regurgitation.
 
The incompetent valve allows blood to re-enter the left ventricle, which results in an increased volume of blood being ejected during the subsequent beat. The increased volume of blood ejected during systole creates an audible ejection systolic murmur.
 
Contributor: Dr. Darryl A Smith FCP (SA) Cardiology

Aortic Regurgitation, Ejection Systolic Murmur- slow

LISTEN WITH HEADPHONES. Recording made with a Thinklabs One Digital Stethoscope and slowed down 50% for learning purposes. The stethoscope is positioned towards the left sternoclavicular junction. Note in this recording the ejection systolic murmur early in systole. The aortic regurgitant murmur is less prominent in this position. Patients with aortic valvular disease may have concomitant aortic stenosis and aortic regurgitation, or may have isolated aortic regurgitation.
This patient had isolated aortic regurgitation.
 
The incompetent valve allows blood to re-enter the left ventricle, which results in an increased volume of blood being ejected during the subsequent beat. The increased volume of blood ejected during systole creates an audible ejection systolic murmur.
 
Contributor: Dr. Darryl A Smith FCP (SA) Cardiology

Aortic Stenosis- normal speed

LISTEN WITH HEADPHONES. Recording made with a Thinklabs One Digital Stethoscope. Systolic Murmur. Harsh blowing sound, crescendo / decrescendo during systole, followed by S2. 


Contributor: Division of Cardiology, Emory University School of Medicine

Aortic Stenosis- slow

LISTEN WITH HEADPHONES. Recording made with a Thinklabs One Digital Stethoscope and slowed down 50% for learning purposes. Systolic Murmur. Harsh blowing sound, crescendo / decrescendo during systole, followed by S2. 
 
Contributor: Division of Cardiology, Emory University School of Medicine

Blood Pressure: Korotkoff Sounds 1

LISTEN WITH HEADPHONES. Recording made with a Thinklabs One Digital Stethoscope. Auscultatory blood pressure measurement showing onset of Korotkoff sounds at systolic pressure, and diminishing sounds as diastolic pressure is reached. Note that last (diastolic) pulse is barely audible but clearly visible.
 
Contributor: Alice Mayfield, Mechanical & Biomedical Engineering,
Carnegie-Mellon University

Blood Pressure: Korotkoff Sounds 2

LISTEN WITH HEADPHONES. Recording made with a Thinklabs One Digital Stethoscope. Blood pressure sounds with slowly deflating cuff. Notice that slower deflation provides for more beats and potentially increased accuracy for onset of systole or detection of diastolic end-point.
 
Contributor: Alice Mayfield, Mechanical & Biomedical Engineering,
Carnegie-Mellon University

Coarctation of the Aorta- normal speed

LISTEN WITH HEADPHONES. Recording made with a Thinklabs One Digital Stethoscope. Usually occurs proximal to the origin of the left subclavian artery. The murmur is best heard with the stethoscope positioned posteriorly in the left suprascapular region using the diaphragm mode. A thrill may be palpable over the left ribs posteriorly due to collateral arteries involving the intercostals arteries.
 
Contributor: Dr. Darryl A Smith FCP (SA) Cardiology

Congestive Heart Failure- normal speed

 

LISTEN WITH HEADPHONES. Recording made with a Thinklabs One Digital Stethoscope. Noticeable third heart sound (S3) during diastole following S2, producing galloping sound. S3 is extremely low frequency and requires good headphones with sealed eartips to hear clearly. Due to low frequency content, set stethoscope to Bell mode. 
 
Contributor: Division of Cardiology, Emory University School of Medicine

Congestive Heart Failure- slow

 

LISTEN WITH HEADPHONES. Recording made with a Thinklabs One Digital Stethoscope and slowed down 50% for learning purposes. Noticeable third heart sound (S3) during diastole following S2, producing galloping sound. S3 is extremely low frequency and requires good headphones with sealed eartips to hear clearly. Due to low frequency content, set stethoscope to Bell mode. 
 
Contributor: Division of Cardiology, Emory University School of Medicine

Hypertrophic Cardiomyopathy- normal speed

LISTEN WITH HEADPHONES. Recording made with a Thinklabs One Digital Stethoscope. The recording was made with the patient supine. The stethoscope is positioned in the 3rd - 4th intercostal space along the left parasternal border i.e just to the left of the sternum using the diaphragm mode. The stethoscope is over the left ventricular outflow tract, below the level of the aortic valve. The obstruction is "dynamic", i.e the obstruction becomes progressively more severe as the ventricle contracts. The murmur therefore increases in intensity during systole as the obstruction increases. The murmur may be confused with that of aortic stenosis. Note however that the aortic component of the second heart sound is easily audible, whereas in aortic stenosis the second heart sound is usually soft. 
 
Contributor: Dr. Darryl A Smith FCP (SA) Cardiology

Hypertrophic Cardiomyopathy- slow

LISTEN WITH HEADPHONES. Recording made with a Thinklabs One Digital Stethoscope and slowed down 50% for learning purposes. The recording was made with the patient supine. The stethoscope is positioned in the 3rd - 4th intercostal space along the left parasternal border i.e just to the left of the sternum using the diaphragm mode. The stethoscope is over the left ventricular outflow tract, below the level of the aortic valve. The obstruction is "dynamic", i.e the obstruction becomes progressively more severe as the ventricle contracts. The murmur therefore increases in intensity during systole as the obstruction increases. The murmur may be confused with that of aortic stenosis. Note however that the aortic component of the second heart sound is easily audible, whereas in aortic stenosis the second heart sound is usually soft. 
 
Contributor: Dr. Darryl A Smith FCP (SA) Cardiology

Infective Endocarditis Mitral Regurgitation- normal speed

LISTEN WITH HEADPHONES. Recording made with a Thinklabs One Digital Stethoscope. 

Infective Endocarditis Mitral Regurgitation- slow

LISTEN WITH HEADPHONES. Recording made with a Thinklabs One Digital Stethoscope and slowed down 50% for learning purposes. 

Minor Cardiomyopathy- normal speed

 

LISTEN WITH HEADPHONES. Recording made with a Thinklabs One Digital Stethoscope. S3 immediately following S2, producing a "gallop." Third heart sound has low frequency energy and is best heard in Bell mode.

Contributor: Division of Cardiology, Emory University School of Medicine

Minor Cardiomyopathy- slow

LISTEN WITH HEADPHONES. Recording made with a Thinklabs One Digital Stethoscope and slowed down 50% for learning purposes. S3 immediately following S2, producing a "gallop." Third heart sound has low frequency energy and is best heard in Bell mode.
 
Contributor: Division of Cardiology, Emory University School of Medicine

Mitral Regurgitation- normal speed

LISTEN WITH HEADPHONES. Recording made with a Thinklabs One Digital Stethoscope. Holosystolic murmur, recorded at the Apex.
High frequency murmur is clearly visible on the phonocardiogram.
S2 is somewhat diminished at the Apex.
 
Contributor: Division of Cardiology, Emory University School of Medicine

Mitral Regurgitation- slow

LISTEN WITH HEADPHONES. Recording made with a Thinklabs One Digital Stethoscope and slowed down 50% for learning purposes. Holosystolic murmur, recorded at the Apex. High frequency murmur is clearly visible on the phonocardiogram. S2 is somewhat diminished at the Apex.
 
Contributor: Division of Cardiology, Emory University School of Medicine

Mitral Regurgitation Tricuspid Regurgitation- normal speed

LISTEN WITH HEADPHONES. Recording made with a Thinklabs One Digital Stethoscope. Systolic murmur (holosystolic)
 
Contributor: Division of Cardiology, Emory University School of Medicine

Mitral Regurgitation Tricuspid Regurgitation- slow

LISTEN WITH HEADPHONES. Recording made with a Thinklabs One Digital Stethoscope and slowed down 50% for learning purposes. Systolic murmur (holosystolic)
 
Contributor: Division of Cardiology, Emory University School of Medicine

Mitral Stenosis- normal speed

LISTEN WITH HEADPHONES. Recording made with a Thinklabs One Digital Stethoscope. The typical auscultatory features of mitral stenosis are a loud S1, early opening snap (OS) of the mitral valve soon after S2, a low-pitched mid-diastolic murmur (MDM) or "rumble" and pre-systolic accentuation (PSA). The murmur is best heard with the patient lying in the left lateral position, using the stethoscope in the Bell mode.
 
Contributor: Dr. Darryl A Smith FCP (SA) Cardiology

Mitral Stenosis- slow

LISTEN WITH HEADPHONES. Recording made with a Thinklabs One Digital Stethoscope and slowed down 50% for learning purposes. The typical auscultatory features of mitral stenosis are a loud S1, early opening snap (OS) of the mitral valve soon after S2, a low-pitched mid-diastolic murmur (MDM) or "rumble" and pre-systolic accentuation (PSA). The murmur is best heard with the patient lying in the left lateral position, using the stethoscope in the Bell mode.
 
Contributor: Dr. Darryl A Smith FCP (SA) Cardiology

Pericarditis- normal speed

LISTEN WITH HEADPHONES. Recording made with a Thinklabs One Digital Stethoscope. A pericardial friction rub is a rough scraping sound described as "leather rubbing against leather" that may be heard in systole and/or diastole. It is more pronounced if the patient is supine, and diminishes as the patient sits forward.
 
Contributor: Terry Bauch MD, FACC, FACP

Pericarditis- slow

LISTEN WITH HEADPHONES. Recording made with a Thinklabs One Digital Stethoscope and slowed down 50% for learning purposes. A pericardial friction rub is a rough scraping sound described as "leather rubbing against leather" that may be heard in systole and/or diastole. It is more pronounced if the patient is supine, and diminishes as the patient sits forward.
 
Contributor: Terry Bauch MD, FACC, FACP

Prosthetic Mitral Valve Closing Click- normal speed

LISTEN WITH HEADPHONES. Recording made with a Thinklabs One Digital Stethoscope.

Prosthetic Mitral Valve Closing Click- slow

LISTEN WITH HEADPHONES. Recording made with a Thinklabs One Digital Stethoscope and slowed down 50% for learning purposes.

Prosthetic Mitral Valve Systolic Murmur Mid-Diastolic Murmur- normal speed

LISTEN WITH HEADPHONES. Recording made with a Thinklabs One Digital Stethoscope.

Prosthetic Valve Aortic Valve Mitral Regurgitation- normal speed

LISTEN WITH HEADPHONES. Recording made with a Thinklabs One Digital Stethoscope.

Prosthetic Valve Aortic Valve Mitral Regurgitation- slow

LISTEN WITH HEADPHONES. Recording made with a Thinklabs One Digital Stethoscope and slowed down 50% for learning purposes.

Prosthetic Valve Systolic Murmur- normal speed

LISTEN WITH HEADPHONES. Recording made with a Thinklabs One Digital Stethoscope.

Prosthetic Valve Systolic Murmur- slow

LISTEN WITH HEADPHONES. Recording made with a Thinklabs One Digital Stethoscope and slowed down 50% for learning purposes.

S2 Split- normal speed

LISTEN WITH HEADPHONES. Recording made with a Thinklabs One Digital Stethoscope. 
 
Contributor: Thinklabs Medical

S2 Split- slow

LISTEN WITH HEADPHONES. Recording made with a Thinklabs One Digital Stethoscope and slowed down 50% for learning purposes. 


Contributor: Thinklabs Medical

S4 Gallop- normal speed

LISTEN WITH HEADPHONES. Recording made with a Thinklabs One Digital Stethoscope. S4 occurs just prior to S1, clearly audible as 2 sounds - S4 quickly followed by S1. Fourth heart sound may be present in patients with hypertension or following an anterior myocardial infarct.
 
Contributor: Division of Cardiology, Emory University School of Medicine

S4 Gallop- slow

LISTEN WITH HEADPHONES. Recording made with a Thinklabs One Digital Stethoscope and slowed down 50% for learning purposes. S4 occurs just prior to S1, clearly audible as 2 sounds - S4 quickly followed by S1. Fourth heart sound may be present in patients with hypertension or following an anterior myocardial infarct.
 
Contributor: Division of Cardiology, Emory University School of Medicine

Ventricular Septal Defect- normal speed

 

LISTEN WITH HEADPHONES. Recording made with a Thinklabs One Digital Stethoscope. Congenital Muscular Ventricular Septal Defect in an adult. Low frequency systolic murmur. The murmur is characteristically loudest in the 4th intercostal space along the left parasternal border.
 
Contributor: Terry Bauch MD, FACC, FACP

Ventricular Septal Defect- slow

LISTEN WITH HEADPHONES. Recording made with a Thinklabs One Digital Stethoscope and slowed down 50% for learning purposes. Congenital Muscular Ventricular Septal Defect in an adult. Low frequency systolic murmur. The murmur is characteristically loudest in the 4th intercostal space along the left parasternal border.
 
Contributor: Terry Bauch MD, FACC, FACP

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