The first heart sound (S1) is heard as a firm but dull “lubb” sound. It consists of four components: a low-frequency, indistinct vibration caused by ventricular contraction; a louder sound of higher frequency caused by closure of the mitral and tricuspid valves; a vibration caused by opening of the semilunar valves and early ejection of blood from the ventricles; and a low-pitched vibration produced by rapid ejection.
The second heart sound (S2) is shorter and higher pitched than the first, is heard as a “dupp” and is produced by closure of the aortic and pulmonary valves.
The third heart sound (S3) is very faint and is caused by blood rushing into the ventricles. It can be heard in most normal persons between the ages of 10 and 20 years.
The fourth heart sound (S4) is rarely audible in a normal heart but can be demonstrated on graphic records. It is short and of low frequency and intensity, and is caused by atrial contraction. The vibrations arise from atrial muscle and from blood flow into, and distention of, the ventricles.
Heart Murmurs are sounds other than the normal heart sounds emanating from the heart region. They are often heard as blowing or hissing sounds as blood leaks back through diseased and malfunctioning valves or as blood is pushed through narrowed or stenotic valve orifices.
Patient discussion about S 3
Q. hi everyone, I am in my 3 trimester….. hi everyone, I am in my 3 trimester….. it is going good ……and I am wondering about my regular period after giving birth...would it come at a normal cycle, or would It still be a little messed up on its schedule??...thanks!
if you do breastfeed- depends on the time you breastfeed.
Q. I heard that omega 3 is good for autoimmune diseases- is that true? I have Rheumatoid Arthritis, and I take all sort of anti inflammatory drugs. And I heard I can take omega 3 and I’ll be able to cut down the medication.
Q. My Sister has Diarrhea for 3 days is it Salmonella? My Sister and I went out to a Chinese restaurant last week to celebrate my Birthday. A couple of days later my Sister became ill and has stomach aches and diarrhea. Is it Salmonella?
Salmonella are usually transmitted to humans by eating foods contaminated with animal feces. Contaminated foods usually look and smell normal. Contaminated foods are often of animal origin, such as beef, poultry, milk, or eggs, but all foods, including vegetables may become contaminated. Many raw foods of animal origin are frequently contaminated, but fortunately, thorough cooking kills Salmonella. Food may also become contaminated by the unwashed hands of an infected food handler, who forgot to wash his or her hands with soap after using the bathroom.