IVMS ICM-Heart Murmurs

Heart Murmurs
Website: http://ivmsicm.blogspot.com/
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Heart Murmurs
Marc Imhotep Cray, M.D.
Companion Online Folder:
IVMS-Physical Diagnosis Notes and Reference Resources
12 p.
IVMS Basic Medical Science of Valvular Heart Disease Also see: Cardiac Auscultation 101: A Basic Science Approach to Diagnosing Heart Murmurs, Christopher Hanifin, PA-C
Outline
I. Basic Pathophysiology II. Describing murmurs III. Systolic murmurs IV. Diastolic murmurs V. Continuous murmurs VI. Summary
Abbreviations and Acronyms

Abbreviations and Acronyms AO = aorta, aortic HCM = hypertrophic cardiomyopathy LV = left ventricular; left ventricle LVH = left ventricular hypertrophy LVOT = left ventricular outflow tract PVC = premature ventricular contraction Q = volumetric flow (cc/sec) SAM = systolic anterior motion of the mitral valve
Basic Pathophysiology
Ventricular Pressure-Volume Loop Changes in Valve Disease Cardiac valve disease significantly alters ventricular pressure and volume relationships during the cardiac cycle. A convenient way to analyze cardiac pressure and volume changes is by using ventricular pressure-volume loops.The links below will illustrate the pressurevolume changes that occur with the following valve defects: Mitral stenosis Aortic stenosis Mitral regurgitation Aortic regurgitation
Systolic
Diastolic
Ventricular Pressure-Volume Loop Changes in Valve Disease

Aortic regurgitation Mitral regurgitation
Aortic stenosis
Mitral stenosis
Auscultation areas of the heart
Describing a heart murmur

1. Timing murmurs are longer than heart sounds HS can distinguished by simultaneous palpation of the carotid arterial pulse systolic, diastolic, continuous 2. Shape crescendo (grows louder), decrescendo, crescendodecrescendo, plateau 3. Location of maximum intensity is determined by the site where the murmur originates e.g. A, P, T, M listening areas
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Describing a heart murmur cont:

4. Radiation reflects the intensity of the murmur and the direction of blood flow 5. Intensity graded on a 6 point scale Grade 1 = very faint Grade 2 = quiet but heard immediately Grade 3 = moderately loud Grade 4 = loud Grade 5 = heard with stethoscope partly off the chest Grade 6 = no stethoscope needed *Note: Thrills are assoc. with murmurs of grades 4 - 6
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Describing a heart murmur cont:

6. Pitch
high, medium, low

7. Quality
blowing, harsh, rumbling, and musical

8. Others:
i. Variation with respiration

Right sided murmurs change more than left sided
ii. Variation with position of the patient iii. Variation with special maneuvers
Valsalva/Standing => Murmurs decrease in length and intensity EXCEPT: Hypertrophic cardiomyopathy and Mitral valve prolapse
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Systolic Murmurs
Derived from increased turbulence associated with:
1. Increased flow across normal SL valve or into a dilated great vessel 2. Flow across an abnormal SL valve or narrowed ventricular outflow tract - e.g. aortic stenosis
3. Flow across an incompetent AV valve - e.g. mitral regurg. 4. Flow across the interventricular septum
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Early Systolic murmurs

1. Acute severe mitral regurgitation
decrescendo murmur best heard at apical impulse Caused by: i. Papillary muscle rupture ii. Infective endocarditis iii. Rupture of the chordae tendineae iv. Blunt chest wall trauma
2. Congenital, small muscular septal defect 3. Tricuspid regurg. with normal PA pressures
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Midsystolic (ejection) murmurs

Are the most common kind of heart murmur Are usually crescendo-decrescendo They may be:
1. Innocent
common in children and young adults
2. Physiologic
can be detected in hyperdynamic states e.g. anemia, pregnancy, fever, and hyperthyroidism
3. Pathologic
are secondary to structural CV abnormalities e.g. Aortic stenosis, Hypertrophic cardiomyopathy, Pulmonic stenosis
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Aortic stenosis
Loudest in aortic area; radiates along the carotid arteries Intensity varies directly with CO A2 decreases as the stenosis worsens Other conditions which may mimic the murmur of aortic stenosis w/o obstructing flow:
1. 2. 3. 4.
Aortic sclerosis Bicuspid aortic valve Dilated aorta Increased flow across the valve during systole
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Hypertrophic cardiomyopathy
Loudest b/t left sternal edge and apex; Grade 2-3/6 Does NOT radiate into neck; carotid upstrokes are brisk and may be bifid Intensity increases w/ maneuvers that decrease LV volume
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Pansystolic (Holosystolic) Murmurs

Are pathologic Murmur begins immediately with S1 and continues up to S2 1. Mitral valve regurgitation
Loudest at the left ventricular apex Radiation reflects the direction of the regurgitant jet i. To the base of the heart = anterosuperior jet (flail posterior leaflet) ii. To the axilla and back = posterior jet (flail anterior leaflet Also usually associated with a systolic thrill, a soft S3, and a short diastolic rumbling (best heard in left lateral decubitus
2. Tricuspid valve regurgitation 3. Ventricular septal defect
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Diastolic Murmurs
Almost always indicate heart disease Two basic types: 1. Early decrescendo diastolic murmurs
signify regurgitant flow through an imcompetent semilunar valve

e.g. aortic regurgitation 2. Rumbling diastolic murmurs in mid- or late diastole
suggest stenosis of an AV valve

e.g. mitral stenosis
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Aortic Regurgitation
Best heard in the 2nd ICS at the left sternal edge High pitched, decrescendo Blowing quality => may be mistaken for breath sounds Radiation: i. Left sternal border = assoc. with primary valvular pathology; ii. Right sternal edge = assoc. w/ primary aortic root pathology Other associated murmurs: i. Midsystolic murmur ii. Austin Flint murmur
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Mitral Stenosis
Two components: 1. Middiastolic - during rapid ventricular filling 2. Presystolic - during atrial contraction; therefore, it disappears if atrial fibrillation develops Is low-pitched and best heard over the apex (w/ the bell) Little or no radiation Murmur begins after an Opening Snap; S1 is accentuated
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Continuous Murmurs
Begin in systole, peak near s2, and continue into all or part of diastole. 1. Cervical venous hum
Audible in kids; can be abolished by compression over the IJV

2. Mammary souffle
Represents augmented arterial flow through engorged breasts Becomes audible during late 3rd trimester and lactation
3. Patent Ductus Arteriosus
Has a harsh, machinery-like quality

4. Pericardial friction rub
Has scratchy, scraping quality

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Back to the Basics

1. When does it occur - systole or diastole 2. Where is it loudest - A, P, T, M I. Systolic Murmurs: 1. Aortic stenosis - ejection type 2. Mitral regurgitation - holosystolic 3. Mitral valve prolapse - late systole
II. Diastolic Murmurs: 1. Aortic regurgitation - early diastole 2. Mitral stenosis - mid to late diastole
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Summary
A. Presystolic murmur Mitral/Tricuspid stenosis B. C.
D. E.
Mitral/Tricuspid regurg. Aortic ejection murmur

Pulmonic stenosis (spilting of S2 E. Aortic/Pulm. diastolic murmur
F. G.
Mitral stenosis w/ Opening snap Mid-diastolic inflow murmur
H. Continuous murmur of PDA
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Heart Murmurs

Abbreviations and Acronyms

Ventricular Pressure-Volume Loop Changes in Valve Disease

Auscultation areas of the heart

Describing a heart murmur

Describing a heart murmur cont:

Describing a heart murmur cont:

high, medium, low

blowing, harsh, rumbling, and musical

i. Variation with respiration

Early Systolic murmurs

Midsystolic (ejection) murmurs

Pansystolic (Holosystolic) Murmurs

signify regurgitant flow through an imcompetent semilunar valve

suggest stenosis of an AV valve

Audible in kids; can be abolished by compression over the IJV

Has a harsh, machinery-like quality

Has scratchy, scraping quality

Back to the Basics

Mitral/Tricuspid regurg. Aortic ejection murmur

Mitral stenosis w/ Opening snap Mid-diastolic inflow murmur

H. Continuous murmur of PDA

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