Which are comorbidities of systolic dysfunction?

• A. MI, genetic mutation, myocarditis, valvular disease
• B. HTN, T2DM/obesity, sleep apnea, pulmonary disease
• C. Aortic stenosis, COPD, asthma, tuberculosis
• D. Renal failure, hepatic cirrhosis, osteoporosis, anemia

Answer: (A)

Systolic dysfunction arises from impaired contractility of the heart, leading to a reduced ejection fraction. Conditions that directly damage the myocardium or alter its ability to contract are the most relevant comorbidities. A history of myocardial infarction leaves scar tissue that can’t contract, lowering LV systolic performance. Genetic mutations, especially in familial dilated cardiomyopathy, directly cause weakened systolic function. Myocarditis inflames and weakens the heart muscle, reducing pumping ability. Valvular disease, when significant, creates abnormal loading or volume overload that the ventricle cannot handle, eventually causing systolic dysfunction. These factors are tightly linked to the development or coexistence of reduced left ventricular systolic function.

While hypertension, type 2 diabetes with obesity, sleep apnea, and pulmonary disease can accompany heart failure and worsen symptoms, they are more commonly risk factors or contributors rather than direct causes of systolic dysfunction. Similarly, renal failure, hepatic cirrhosis, osteoporosis, and anemia may complicate the clinical picture but are not the classic direct causes of reduced systolic contractility.