Clinical meaning
Heart sounds are produced by the closure of cardiac valves and turbulent blood flow. S1 (lub) occurs with mitral and tricuspid valve closure at the onset of systole, while S2 (dub) occurs with aortic and pulmonic valve closure at the onset of diastole. S3 is a low-pitched sound heard in early diastole, often associated with heart failure in adults due to rapid ventricular filling against a non-compliant ventricle. S4 occurs in late diastole and is associated with a stiff, hypertrophied ventricle, commonly heard in hypertension and aortic stenosis.
Cardiovascular complications can rapidly progress to hemodynamic instability and organ failure. The RPN/LVN must monitor vital signs frequently, recognize early signs of decompensation such as changes in heart rate, blood pressure, and peripheral perfusion, and escalate concerns promptly. Electrocardiographic changes may provide early warning of cardiac compromise before clinical symptoms become apparent.
Within the RPN/LVN scope of practice, nursing care for heart sounds includes systematic assessment, implementation of established care protocols, accurate documentation, and timely communication with the interprofessional team. The practical nurse contributes to patient safety through ongoing monitoring, patient education reinforcement, and adherence to evidence-based practice standards. Understanding the underlying pathophysiology enables the practical nurse to anticipate potential complications and respond appropriately within their scope.