Rheumatic Heart Disease and Reading the Murmurs

From a sore throat to a scarred valve

Rheumatic heart disease is the long shadow cast by a common childhood infection. After an untreated strep throat, some children develop rheumatic fever, in which the immune system, confused by a resemblance between the bacterium and the body's own tissues, attacks several organs — including the heart, where it causes rheumatic carditis. The acute illness usually settles, but it can leave the valves — above all the mitral valve — permanently inflamed and scarred.

The scarring plays out over decades. Inflamed leaflets thicken and their edges fuse, so the valve opening narrows into the classic mitral stenosis we met in the last guide; often there is some leakage as well, a mixed lesion. This is why rheumatic heart disease remains the leading cause of valve disease in much of the world even though it has become rare where strep throat is reliably treated with antibiotics. The lesson is hopeful: treating the childhood infection prevents the adult valve disease entirely.

A unified way to read any murmur

A murmur is simply the sound of turbulent blood — flow that has become rough rather than smooth, either squeezing through a narrow valve or leaking back through a closed one. The skill of auscultation is not magic; it is asking three plain questions in order, and each answer narrows the field.

1. Timing first. Is it during systole (between “lub” and “dub”) or diastole? This single answer halves the possibilities.
2. Location next. Where on the chest is it loudest — upper right (aortic), upper left (pulmonary), lower left sternum (tricuspid), or the apex (mitral)?
3. Radiation and character. Does it carry to the neck (aortic stenosis) or the armpit (mitral regurgitation)? Is it harsh or blowing?
4. Combine. Systolic + upper right + radiates to neck = aortic stenosis; systolic + apex + radiates to armpit = mitral regurgitation; diastolic + apex rumble = mitral stenosis.

DECODING A MURMUR — a worked walk-through

Heard:   harsh sound BETWEEN lub and dub  → SYSTOLIC
Loudest: upper-right sternal border        → AORTIC area
Carries: up into both sides of the neck    → radiates to carotids
Pulse:   slow-rising, weak                 → fits a tight outlet
----------------------------------------------------------
Read:    systolic + aortic area + neck radiation
         + slow-rising pulse
Answer:  AORTIC STENOSIS

Confirm, never diagnose by ear alone:
  next step = echocardiography to measure the valve area.