Clinical meaning
The cardiovascular system consists of the heart, blood vessels, and blood, functioning as a closed-loop transport system. The heart is a four-chambered muscular pump divided into right and left sides. The right side receives deoxygenated blood from systemic circulation and pumps it to the lungs via the pulmonary artery. The left side receives oxygenated blood from the lungs and pumps it to systemic circulation via the aorta. Cardiac output (CO = HR × SV) is determined by heart rate, preload, afterload, and contractility. The coronary arteries supply the myocardium with oxygenated blood, with the left anterior descending artery being the most commonly occluded vessel in myocardial infarction.
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 cardiovascular system basics 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.