Final answer:
For an asymptomatic 63-year-old man with primary mitral regurgitation and a normal ejection fraction, regular monitoring and conservative management are typically recommended. Stroke volume and heart rate measurements are critical in managing and evaluating heart function.
Step-by-step explanation:
The treatment plan for an asymptomatic and active 63-year-old man with primary mitral regurgitation, left ventricular systolic dimension of 45 mmHg, and an ejection fraction of 55% would generally be conservative in nature. Given that the patient is asymptomatic and has an ejection fraction within the normal range (55-70%), routine monitoring with echocardiography is recommended to assess the progression of mitral regurgitation and left ventricular function over time. Treatment may involve medications to manage blood pressure and prevent heart failure.
Stroke volume (SV), which is the amount of blood pumped by the left ventricle in one contraction, can be measured non-invasively with an echocardiogram. This measurement helps in calculating the ejection fraction (EF), which is the percentage of blood that is ejected from the heart with each contraction. An average resting heart rate (HR) contributes to the overall cardiac output along with SV.
In this case, since the patient has a good ejection fraction and is asymptomatic, the main focus would be on regular follow-ups and possibly lifestyle modifications to manage overall cardiovascular health.