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Symptoms and Signs – Differential Diagnosis of Murmurs
Auscultatory murmurs are noises detected within the heart chambers or main arteries. They are categorized according on their timing and length within the cardiac cycle, auscultatory site, intensity, configuration, pitch, and quality.
Timing may be classified as systolic (between S1 and S2), holosystolic (persistent throughout systole), diastolic (between S2 and S1), or continuous across both systole and diastole; systolic and diastolic murmurs can additionally be categorized as early, mid, or late.
Location denotes the region of peak audibility, including the apex, the lower left sternal boundary, or an intercostal space. Loudness is assessed on a scale from 1 to 6. A grade 1 murmur is exceedingly subtle, discernible just by meticulous auscultation. A grade 2 murmur is a faint yet discernible murmur. Murmurs classified as grade 3 are of moderate loudness. A grade 4 murmur is a pronounced murmur accompanied with a potential intermittent thrill. Grade 5 murmurs are pronounced and accompanied by a detectable precordial thrill. Grade 6 murmurs are pronounced and, similar to grade 5 murmurs, are accompanied by a palpable excitement. A grade 6 murmur is discernible even after the stethoscope is removed from the thoracic wall.
Configuration, or shape, pertains to the characteristics of loudness — crescendo (increases in volume), decrescendo (decreases in volume), crescendo-decrescendo (first rises, then falls), decrescendo-crescendo (initially falls, then rises), plateau (constant intensity), or varied (inconsistent intensity). The pitch of the murmur may be elevated or diminished. The quality might be characterized as harsh, rumbling, blowing, scratching, buzzing, melodic, or squeaking.
Murmurs may indicate increased blood flow through either normal or pathological conditions. Valves facilitate forward blood flow through a constricted or irregular valve or into a dilated channel; let blood backflow through an incompetent valve, septal defect, or patent ductus arteriosus; or result in decreased blood viscosity. Murmurs, typically indicative of organic heart illness, may occasionally denote an emergency; for instance, a pronounced holosystolic murmur following an acute myocardial infarction (MI) may indicate papillary muscle rupture or a ventricular septal defect. Murmurs may also arise with the surgical implantation of a replacement valve.
Certain murmurs are benign or functioning. An innocent systolic murmur is often quiet, medium-pitched, and most pronounced along the left sternal border at the second or third intercostal space. It is intensified by physical exertion, agitation, fever, pregnancy, anemia, or thyrotoxicosis. Examples include Still's murmur in children and mammary souffle, typically auscultated across either breast during late pregnancy and early postpartum periods.
Medical History and Physical Assessment
Upon detecting a murmur, endeavor to ascertain its classification by meticulous auscultation.. Utilize the bell of your stethoscope for low-frequency murmurs and the diaphragm for high-frequency murmurs.
URGENT INTERVENTIONS
When Murmurs Indicate an Emergency Murmurs, particularly newly acquired ones, may indicate a significant complication in individuals with bacterial endocarditis or a recent acute myocardial infarction (MI), while not typically being an emergency sign.
When managing a patient with confirmed or suspected bacterial endocarditis, meticulously auscultate for the presence of new murmurs. Their advancement, accompanied by crackles, jugular vein distention, orthopnea, and dyspnea, these symptoms may indicate heart failure.
Consistent auscultation is crucial for a patient who has suffered an acute myocardial infarction. A pronounced decrescendo holosystolic murmur at the apex, radiating to the axilla and left sternal border or throughout the chest, is noteworthy, especially when accompanied by a widely divided S2 and an atrial gallop (S4). The presence of this murmur, alongside indications of severe pulmonary edema, typically signifies the onset of acute mitral regurgitation resulting from the rupture of the chordae tendineae – a medical emergency.
Subsequently, acquire the patient's medical history. Inquire whether the murmur is a recent finding or if it has been recognized since birth or infancy. Determine whether the patient has encountered concomitant symptoms, specifically palpitations, dizziness, syncope, chest discomfort, dyspnea, and weariness. Examine the patient's medical history, with specific attention to any occurrences of rheumatic fever, heart disease, or heart surgery, especially prosthetic valve replacement.
Conduct a methodical physical assessment. Particularly observe the occurrence of cardiac arrhythmias, jugular vein distention, and pulmonary manifestations like dyspnea, orthopnea, and crackles. Is the patient's liver painful or palpable? Does he exhibit peripheral edema?
Etiological Factors
Aortic regurgitation.
Acute aortic insufficiency generally generates a quiet, brief diastolic murmur along the left sternal boundary, most audible when the patient is seated and leans forward, as well as at the conclusion of a forced expiration. S2 may be diminished or missing. A quiet, brief midsystolic murmur may occasionally be auscultated above the second right intercostal region. Accompanying findings consist of tachycardia, dyspnea, jugular vein distention, crackles, heightened tiredness, and pale, chilly extremities.
Chronic aortic insufficiency produces a high-pitched, blown, decrescendo diastolic murmur, optimally auscultated over the second or third right intercostal space or the left sternal border, with the patient in a seated position, leaning forward, and holding their breath following deep expiration. An Austin Flint murmur — a low-frequency, mid-to-late diastolic murmur most prominently detected near the apex — may also manifest. Complications may not manifest until the patient reaches ages 40 to 50; subsequent observations typically include palpitations, tachycardia, angina, heightened tiredness, dyspnea, orthopnea, and crackles.
Aortic stenosis
The murmur associated with aortic stenosis is systolic, commencing after S1 and concluding at or prior to the closing of the aortic valve. It is abrasive and jarring, of medium pitch, exhibiting a crescendo and decrescendo. The murmur is most pronounced over the second right intercostal space when the patient is seated and leaning forward; it may also be audible at the apex, the suprasternal notch (Erb’s point), and the carotid arteries.
In cases of advanced disease, S2 may be perceived as a singular sound, with aortic closure being inaudible. An early systolic ejection click at the apex is characteristic but is missing in cases of extensive valve calcification. Associated signs and symptoms often manifest by age 30 in congenital aortic stenosis, between ages 30 and 65 in rheumatic disease-related stenosis, and post age 65 in calcific aortic stenosis. Symptoms may encompass dizziness, syncope, exertional dyspnea, paroxysmal nocturnal dyspnea, weariness, and angina.
Hypertrophic cardiomyopathy
Hypertrophic cardiomyopathy produces a pronounced late systolic murmur that concludes at S2. The murmur is best detected around the left sternal border and at the apex, often accompanied by an audible S3 or S4. The murmur diminishes with squatting and intensifies with sitting. Primary related symptoms include dyspnea and chest discomfort; palpitations, disorientation, and syncope may additionally manifest.
Mitral regurgitation
Acute mitral insufficiency is marked by a medium-pitched, blown, early systolic or holosystolic decrescendo murmur near the apex, accompanied by a widely split S2 and frequently an S4. This murmur does not intensify during inspiration, unlike tricuspid insufficiency. Commonly observed findings often encompass tachycardia and indications of acute pulmonary edema.
Chronic mitral insufficiency results in a high-pitched, blowing, holosystolic plateau murmur that is most pronounced at the apex and typically radiates to the axilla or back. Fatigue, dyspnea, and palpitations may additionally manifest.
Mitral valve prolapse
Mitral prolapse produces a midsystolic to late-systolic click accompanied by a high-pitched late-systolic crescendo murmur, most prominently audible at the apex. Intermittently, many clicks may be audible, with or without a systolic murmur. Related symptoms encompass cardiac awareness, migraine headaches, dizziness, weakness, syncope, palpitations, chest discomfort, dyspnea, significant episodic fatigue, mood fluctuations, and anxiety.
Mitral stenosis
In mitral stenosis, the murmur is characterized as mild, low-pitched, rumbling, crescendo-decrescendo, and diastolic, often accompanied by a pronounced S1 or an opening snap, which is a key indicator. The optimal auscultation occurs at the apex with the patient positioned laterally to the left. Moderate exertion facilitates the audibility of this murmur.
In cases of severe stenosis, a murmur indicative of mitral regurgitation may be audible. Additional observations encompass hemoptysis, exertional dyspnea, tiredness, and indications of acute pulmonary edema.
Myxomas
A left atrial myxoma, the most prevalent type, typically generates a middiastolic murmur and a holosystolic murmur that is most pronounced at the apex, accompanied by an S4, an early diastolic thudding sound (tumor plop), and a loud, widely divided S1. Associated symptoms including dyspnea, orthopnea, thoracic discomfort, exhaustion, weight reduction, and syncope.
A right atrial myxoma produces a late diastolic rumbling murmur, a holosystolic crescendo murmur, and a tumor plop, most prominently audible near the lower left sternal boundary. Additional findings including tiredness, peripheral edema, ascites, and hepatomegaly.
A left ventricular myxoma, which is rare, generates a systolic murmur most prominently detected at the lower left sternal border, along with arrhythmias, dyspnea, and syncope.
A right ventricular myxoma typically produces a systolic ejection murmur accompanied by a delayed S2 and a tumor plop, most prominently audible near the left sternal boundary. It is associated with peripheral edema, hepatomegaly, ascites, dyspnea, and syncope.
Rupture of the papillary muscle
A loud holosystolic murmur can be auscultated near the apex in cases of papillary muscle rupture, a life-threatening consequence of acute myocardial infarction. Associated findings encompass significant dyspnea, thoracic discomfort, syncope, hemoptysis, tachycardia, and hypotension.
Rheumatic fever accompanied by pericarditis
A pericardial friction rub, accompanied by murmurs and gallops, is optimally auscultated when the patient is positioned on hands and knees during forced expiration. The predominant murmurs detected include the systolic murmur of mitral regurgitation, a midsystolic murmur resulting from mitral valve leaflet edema, and the diastolic murmur of aortic regurgitation. Additional signs and symptoms encompass fever, joint and sternal discomfort, edema, and tachypnea.
Tricuspid regurgitation
Tricuspid insufficiency is a valve disorder characterized by a mild, high-pitched, holosystolic blowing murmur that intensifies with inspiration (Carvallo’s sign), diminishes with exhale and Valsalva maneuver, and is optimally auscultated over the lower left sternal border and the xiphoid region. After an extended asymptomatic phase, symptoms such as exertional dyspnea and orthopnea may manifest, accompanied by jugular vein distention, ascites, peripheral cyanosis and edema, muscle wasting, lethargy, weakness, and syncope.
Tricuspid stenosis
Tricuspid stenosis is a valve condition that generates a diastolic murmur like to that of mitral stenosis, although more pronounced during inspiration and diminished during exhale and the Valsalva maneuver. S1 may also exhibit increased loudness. Accompanying signs and symptoms encompass fatigue, syncope, peripheral edema, jugular vein distention, ascites, hepatomegaly, and dyspnea.
Alternative Causes
Therapies. Prosthetic valve replacement can produce diverse murmurs, influenced by the location, valve material, and operational technique.
Particular Considerations
Prepare the patient for diagnostic procedures, including electrocardiography, echocardiography, and angiography. Administer an antibiotic and an anticoagulant as indicated. Due to the distressing nature of a heart problem, offer emotional support.
Patient Consultation
Detail the indications and symptoms the patient must communicate and the applicability of prophylactic antibiotics, if relevant.
Pediatric Guidelines
Innocuous murmurs, such as Still's murmur, are frequently seen in young children and generally resolve after puberty. Pathognomonic heart murmurs in newborns and young children typically arise from congenital heart disease, including atrial and ventricular septal abnormalities. Additional murmurs may be acquired, as seen in rheumatic heart disease.
Auscultatory murmurs are noises detected within the heart chambers or main arteries. They are categorized according on their timing and length within the cardiac cycle, auscultatory site, intensity, configuration, pitch, and quality.
Timing may be classified as systolic (between S1 and S2), holosystolic (persistent throughout systole), diastolic (between S2 and S1), or continuous across both systole and diastole; systolic and diastolic murmurs can additionally be categorized as early, mid, or late.
Location denotes the region of peak audibility, including the apex, the lower left sternal boundary, or an intercostal space. Loudness is assessed on a scale from 1 to 6. A grade 1 murmur is exceedingly subtle, discernible just by meticulous auscultation. A grade 2 murmur is a faint yet discernible murmur. Murmurs classified as grade 3 are of moderate loudness. A grade 4 murmur is a pronounced murmur accompanied with a potential intermittent thrill. Grade 5 murmurs are pronounced and accompanied by a detectable precordial thrill. Grade 6 murmurs are pronounced and, similar to grade 5 murmurs, are accompanied by a palpable excitement. A grade 6 murmur is discernible even after the stethoscope is removed from the thoracic wall.
Configuration, or shape, pertains to the characteristics of loudness — crescendo (increases in volume), decrescendo (decreases in volume), crescendo-decrescendo (first rises, then falls), decrescendo-crescendo (initially falls, then rises), plateau (constant intensity), or varied (inconsistent intensity). The pitch of the murmur may be elevated or diminished. The quality might be characterized as harsh, rumbling, blowing, scratching, buzzing, melodic, or squeaking.
Murmurs may indicate increased blood flow through either normal or pathological conditions. Valves facilitate forward blood flow through a constricted or irregular valve or into a dilated channel; let blood backflow through an incompetent valve, septal defect, or patent ductus arteriosus; or result in decreased blood viscosity. Murmurs, typically indicative of organic heart illness, may occasionally denote an emergency; for instance, a pronounced holosystolic murmur following an acute myocardial infarction (MI) may indicate papillary muscle rupture or a ventricular septal defect. Murmurs may also arise with the surgical implantation of a replacement valve.
Certain murmurs are benign or functioning. An innocent systolic murmur is often quiet, medium-pitched, and most pronounced along the left sternal border at the second or third intercostal space. It is intensified by physical exertion, agitation, fever, pregnancy, anemia, or thyrotoxicosis. Examples include Still's murmur in children and mammary souffle, typically auscultated across either breast during late pregnancy and early postpartum periods.
Medical History and Physical Assessment
Upon detecting a murmur, endeavor to ascertain its classification by meticulous auscultation.. Utilize the bell of your stethoscope for low-frequency murmurs and the diaphragm for high-frequency murmurs.
URGENT INTERVENTIONS
When Murmurs Indicate an Emergency Murmurs, particularly newly acquired ones, may indicate a significant complication in individuals with bacterial endocarditis or a recent acute myocardial infarction (MI), while not typically being an emergency sign.
When managing a patient with confirmed or suspected bacterial endocarditis, meticulously auscultate for the presence of new murmurs. Their advancement, accompanied by crackles, jugular vein distention, orthopnea, and dyspnea, these symptoms may indicate heart failure.
Consistent auscultation is crucial for a patient who has suffered an acute myocardial infarction. A pronounced decrescendo holosystolic murmur at the apex, radiating to the axilla and left sternal border or throughout the chest, is noteworthy, especially when accompanied by a widely divided S2 and an atrial gallop (S4). The presence of this murmur, alongside indications of severe pulmonary edema, typically signifies the onset of acute mitral regurgitation resulting from the rupture of the chordae tendineae – a medical emergency.
Subsequently, acquire the patient's medical history. Inquire whether the murmur is a recent finding or if it has been recognized since birth or infancy. Determine whether the patient has encountered concomitant symptoms, specifically palpitations, dizziness, syncope, chest discomfort, dyspnea, and weariness. Examine the patient's medical history, with specific attention to any occurrences of rheumatic fever, heart disease, or heart surgery, especially prosthetic valve replacement.
Conduct a methodical physical assessment. Particularly observe the occurrence of cardiac arrhythmias, jugular vein distention, and pulmonary manifestations like dyspnea, orthopnea, and crackles. Is the patient's liver painful or palpable? Does he exhibit peripheral edema?
Etiological Factors
Aortic regurgitation.
Acute aortic insufficiency generally generates a quiet, brief diastolic murmur along the left sternal boundary, most audible when the patient is seated and leans forward, as well as at the conclusion of a forced expiration. S2 may be diminished or missing. A quiet, brief midsystolic murmur may occasionally be auscultated above the second right intercostal region. Accompanying findings consist of tachycardia, dyspnea, jugular vein distention, crackles, heightened tiredness, and pale, chilly extremities.
Chronic aortic insufficiency produces a high-pitched, blown, decrescendo diastolic murmur, optimally auscultated over the second or third right intercostal space or the left sternal border, with the patient in a seated position, leaning forward, and holding their breath following deep expiration. An Austin Flint murmur — a low-frequency, mid-to-late diastolic murmur most prominently detected near the apex — may also manifest. Complications may not manifest until the patient reaches ages 40 to 50; subsequent observations typically include palpitations, tachycardia, angina, heightened tiredness, dyspnea, orthopnea, and crackles.
Aortic stenosis
The murmur associated with aortic stenosis is systolic, commencing after S1 and concluding at or prior to the closing of the aortic valve. It is abrasive and jarring, of medium pitch, exhibiting a crescendo and decrescendo. The murmur is most pronounced over the second right intercostal space when the patient is seated and leaning forward; it may also be audible at the apex, the suprasternal notch (Erb’s point), and the carotid arteries.
In cases of advanced disease, S2 may be perceived as a singular sound, with aortic closure being inaudible. An early systolic ejection click at the apex is characteristic but is missing in cases of extensive valve calcification. Associated signs and symptoms often manifest by age 30 in congenital aortic stenosis, between ages 30 and 65 in rheumatic disease-related stenosis, and post age 65 in calcific aortic stenosis. Symptoms may encompass dizziness, syncope, exertional dyspnea, paroxysmal nocturnal dyspnea, weariness, and angina.
Hypertrophic cardiomyopathy
Hypertrophic cardiomyopathy produces a pronounced late systolic murmur that concludes at S2. The murmur is best detected around the left sternal border and at the apex, often accompanied by an audible S3 or S4. The murmur diminishes with squatting and intensifies with sitting. Primary related symptoms include dyspnea and chest discomfort; palpitations, disorientation, and syncope may additionally manifest.
Mitral regurgitation
Acute mitral insufficiency is marked by a medium-pitched, blown, early systolic or holosystolic decrescendo murmur near the apex, accompanied by a widely split S2 and frequently an S4. This murmur does not intensify during inspiration, unlike tricuspid insufficiency. Commonly observed findings often encompass tachycardia and indications of acute pulmonary edema.
Chronic mitral insufficiency results in a high-pitched, blowing, holosystolic plateau murmur that is most pronounced at the apex and typically radiates to the axilla or back. Fatigue, dyspnea, and palpitations may additionally manifest.
Mitral valve prolapse
Mitral prolapse produces a midsystolic to late-systolic click accompanied by a high-pitched late-systolic crescendo murmur, most prominently audible at the apex. Intermittently, many clicks may be audible, with or without a systolic murmur. Related symptoms encompass cardiac awareness, migraine headaches, dizziness, weakness, syncope, palpitations, chest discomfort, dyspnea, significant episodic fatigue, mood fluctuations, and anxiety.
Mitral stenosis
In mitral stenosis, the murmur is characterized as mild, low-pitched, rumbling, crescendo-decrescendo, and diastolic, often accompanied by a pronounced S1 or an opening snap, which is a key indicator. The optimal auscultation occurs at the apex with the patient positioned laterally to the left. Moderate exertion facilitates the audibility of this murmur.
In cases of severe stenosis, a murmur indicative of mitral regurgitation may be audible. Additional observations encompass hemoptysis, exertional dyspnea, tiredness, and indications of acute pulmonary edema.
Myxomas
A left atrial myxoma, the most prevalent type, typically generates a middiastolic murmur and a holosystolic murmur that is most pronounced at the apex, accompanied by an S4, an early diastolic thudding sound (tumor plop), and a loud, widely divided S1. Associated symptoms including dyspnea, orthopnea, thoracic discomfort, exhaustion, weight reduction, and syncope.
A right atrial myxoma produces a late diastolic rumbling murmur, a holosystolic crescendo murmur, and a tumor plop, most prominently audible near the lower left sternal boundary. Additional findings including tiredness, peripheral edema, ascites, and hepatomegaly.
A left ventricular myxoma, which is rare, generates a systolic murmur most prominently detected at the lower left sternal border, along with arrhythmias, dyspnea, and syncope.
A right ventricular myxoma typically produces a systolic ejection murmur accompanied by a delayed S2 and a tumor plop, most prominently audible near the left sternal boundary. It is associated with peripheral edema, hepatomegaly, ascites, dyspnea, and syncope.
Rupture of the papillary muscle
A loud holosystolic murmur can be auscultated near the apex in cases of papillary muscle rupture, a life-threatening consequence of acute myocardial infarction. Associated findings encompass significant dyspnea, thoracic discomfort, syncope, hemoptysis, tachycardia, and hypotension.
Rheumatic fever accompanied by pericarditis
A pericardial friction rub, accompanied by murmurs and gallops, is optimally auscultated when the patient is positioned on hands and knees during forced expiration. The predominant murmurs detected include the systolic murmur of mitral regurgitation, a midsystolic murmur resulting from mitral valve leaflet edema, and the diastolic murmur of aortic regurgitation. Additional signs and symptoms encompass fever, joint and sternal discomfort, edema, and tachypnea.
Tricuspid regurgitation
Tricuspid insufficiency is a valve disorder characterized by a mild, high-pitched, holosystolic blowing murmur that intensifies with inspiration (Carvallo’s sign), diminishes with exhale and Valsalva maneuver, and is optimally auscultated over the lower left sternal border and the xiphoid region. After an extended asymptomatic phase, symptoms such as exertional dyspnea and orthopnea may manifest, accompanied by jugular vein distention, ascites, peripheral cyanosis and edema, muscle wasting, lethargy, weakness, and syncope.
Tricuspid stenosis
Tricuspid stenosis is a valve condition that generates a diastolic murmur like to that of mitral stenosis, although more pronounced during inspiration and diminished during exhale and the Valsalva maneuver. S1 may also exhibit increased loudness. Accompanying signs and symptoms encompass fatigue, syncope, peripheral edema, jugular vein distention, ascites, hepatomegaly, and dyspnea.
Alternative Causes
Therapies. Prosthetic valve replacement can produce diverse murmurs, influenced by the location, valve material, and operational technique.
Particular Considerations
Prepare the patient for diagnostic procedures, including electrocardiography, echocardiography, and angiography. Administer an antibiotic and an anticoagulant as indicated. Due to the distressing nature of a heart problem, offer emotional support.
Patient Consultation
Detail the indications and symptoms the patient must communicate and the applicability of prophylactic antibiotics, if relevant.
Pediatric Guidelines
Innocuous murmurs, such as Still's murmur, are frequently seen in young children and generally resolve after puberty. Pathognomonic heart murmurs in newborns and young children typically arise from congenital heart disease, including atrial and ventricular septal abnormalities. Additional murmurs may be acquired, as seen in rheumatic heart disease.
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