Final answer:
Medical therapy's impact on survival in valvular heart disease cases can be significant, especially when conditions like stenosis and carditis lead to severe complications requiring surgical intervention or medication alongside lifestyle changes.
Step-by-step explanation:
The effect of medical therapy for valvular heart disease on survival largely depends on the type and severity of the condition. Conditions such as stenosis and subacute bacterial endocarditis may lead to the heart working harder and, as a result, weaken over time. Aortic stenosis is a common condition that affects an increased percentage of the elderly population, and if left untreated, may require surgical intervention for survival.
Carditis, often triggered by rheumatic fever, can lead to valvular disorders that may necessitate medication or surgery. In cases like myocardial infarction, surgical procedures like coronary bypass surgery may be necessary, although they do not increase longevity. Instead, medical therapy aimed at lifestyle changes and medication to control blood pressure, cholesterol, and reduce clotting can be equally effective.