Summary
Highlights
This lesson introduces heart valve disorders, covering their pathophysiology, etiology, subjective and objective data, nursing interventions, and rationales. Heart valve disorders compromise blood flow direction through the valves, leading to compromised cardiac output. Common types include mitral regurgitation, mitral stenosis, aortic regurgitation, and aortic stenosis. The most common causes are rheumatic fever or endocarditis, leading to damage, vegetations, or thickening of the heart valves. Acute emergencies can be caused by mitral valve prolapse or papillary muscle rupture. The goal is to preserve cardiac output, proceed with valve repair or replacement, and prevent complications.
Mitral regurgitation occurs when the mitral valve cannot close completely, causing blood to flow back into the left atrium. Mitral stenosis is when the mitral valve cannot open fully, preventing blood from entering the left ventricle. Aortic regurgitation happens when the aortic valve cannot close completely, leading to blood flowing back into the left ventricle. Aortic stenosis is when the aortic valve cannot open fully, impeding blood flow out of the left ventricle.
Subjective data includes symptoms reported by the patient. Patients with heart valve issues may be asymptomatic except for a heart murmur. If cardiac output is compromised, they may experience chest pain, shortness of breath, weakness, and fatigue. Objective data observable during examination includes a systolic murmur (aortic stenosis or mitral regurgitation) or a diastolic murmur (aortic regurgitation or mitral stenosis). Compromised cardiac output can lead to decreased blood pressure, increased heart rate, weak pulses, slow capillary refill, and cool, diaphoretic, or dusky skin.
Assessing heart sounds is crucial to identify valve disorders, with murmurs indicating turbulent blood flow. Differentiating between S1 and S2 murmurs helps identify the affected valve. Nurses must monitor cardiovascular status (blood pressure, heart rate, pulses, capillary refill, skin color, temperature, and arrhythmias) to detect decreased tissue perfusion. Assessing respiratory status is vital, as blood backup can cause pulmonary congestion, crackles, and pink frothy sputum. Any new or sudden murmur accompanied by poor perfusion or pulmonary edema should be reported immediately, as it could indicate an emergency like papillary muscle rupture or mitral valve prolapse, requiring immediate surgical intervention.
Patients undergoing valve replacement surgery require essential post-operative education. They will need lifelong anticoagulant therapy, requiring education on precautions like using an electric razor and soft-bristled toothbrushes, and regular monitoring. Patients with artificial heart valves are at high risk for endocarditis, necessitating education on prevention, including prophylactic antibiotics for procedures and maintaining good oral hygiene. It's important to stress the connection between oral bacteria and valve infections. Patients should avoid dental procedures for up to six months after valve surgery.
A quick review of heart valve disorders highlights that compromised blood flow through valves leads to compromised cardiac output. Disorders include mitral regurgitation, mitral stenosis, aortic regurgitation, and aortic stenosis. Patients can be asymptomatic or have a murmur. Subjective data for compromised cardiac output includes chest pain, shortness of breath, weakness, and fatigue. Objective data includes decreased blood pressure, increased heart rate, weak pulses, slow capillary refill, and pale, cool, clammy skin. Key nursing interventions involve assessing heart sounds for murmurs, respiratory status for pulmonary edema, and cardiovascular status for decreased perfusion. New onset murmurs must be reported immediately, as they can indicate papillary muscle rupture requiring surgical intervention. Educate valve replacement patients on lifelong anticoagulant therapy and endocarditis prevention.