Heart Sounds

Heart sounds are brief vibrations produced mainly when cardiac valves close and blood movement changes inside the chambers. S1, the first sound, is associated with closure of the mitral and tricuspid valves at the beginning of ventricular systole. S2, the second sound, follows ventricular ejection and reflects closure of the aortic and pulmonic valves. Normal assessment involves more than hearing “lub-dub.” The nurse considers the rate, rhythm, intensity, splitting, timing, and location of each sound, then compares the finding with the patient’s symptoms and previous assessments. An extra sound may be an important clue without identifying its cause by itself. A new S3 or S4 in an adult therefore deserves clinical interpretation rather than automatic labelling. The experienced nurse listens for the sound, then immediately asks what the heart and circulation are doing: Is the patient short of breath? Is blood pressure falling? Is the rhythm irregular? Are there signs of congestion or poor perfusion? That connection between the acoustic finding and the patient’s condition determines priority.