Heart sound ?What we hear We have all heard the heart make the usual sounds. LUB----------DUB
Lub is the first sound or S1 Dub is the second heart sound or S2 First heart sound S1 The lub in the lub dub. This sound is primarily because of the closing of the mitral and tricuspid valves.
Anatomically they are located between the atria and the ventricles They close because the ventricles contract S1 Louder than usual - Mitral Stenosis
Diminished Mitral or Aortic Regurg. Second heart sound S2 S2 is the dub in the lub- dub The sounds are because of the closing of the Pulmonic and Aortic valves. This is the end of systole S2
Wide split sounds or fixed Atrial Septal Defect RBBB Pulmonic Stenosis Systole The time between the S1 and S2 sounds is: Lub------------Dub
The ventricles contracting Blood flowing from the heart to the lungs and body Blood flowing across the Pulmonic and Aortic valves Diastole The time between S2 and S1 is : Dub----------Lub The blood is flowing from the atria to the ventricles.
The blood flowing across the bicuspid and tricuspid valves. The atrial contraction also occurs now Area Of Auscultation Area Of Auscultation
Pulmonary valve second intercostal space, left upper sternal border Aortic valve second intercostal space ,right upper sternal border Mitral valve fifth intercostal space , left midclavicular line Tricuspid valve fourth intercostal space, lower
left sternal border S3 Third heart sound
also called a protodiastolic gallop, ventricular gallop caused by Rapid ventricular filling. It occurs at the beginning of diastole after S2. The third heart sound is benign in youth, some trained athletes, and sometimes in pregnancy The commonest causes are left ventricular failure and mitral regurgitation It is best heard with the bell-side of the
stethoscope at the apex of the heart . S4 fourth heart sound called a presystolic gallop or atrial gallop.
This gallop is produced by the sound of blood being forced into a stiff/hypertrophic ventricle. It is a sign of a pathologic state, (left ventriclular hypertrophy, hypertension, aortic stenosis) It is best heard with the bell-side of the stethoscope at the apex of the heart . LUB-- DUB-------------LUBDUB S1 S2
S3 S4 S1 S2 Here is where you expect to hear the various sounds Added sound Clicks
Rubs Heart murmurs
Heart murmurs are generated by turbulent flow of blood, which may occur inside or outside the heart. Murmurs may be physiological (benign) or pathological (abnormal). Abnormal murmurs can be caused by stenosis restricting the opening of a heart valve, resulting in turbulence as blood flows through it.
Abnormal murmurs may also occur with valvular insufficiency (or regurgitation), which allows backflow of blood when the incompetent valve closes with only partial effectiveness. Different murmurs are audible in different parts of the cardiac cycle, depending on the cause of the murmur Heart murmurs are most frequently organized by timing, into systolic heart murmurs and
diastolic heart murmurs. However, continuous murmurs cannot be directly placed into either category Thank you
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