Diagnostic methods relating to a cardiac ventricular dysfunction are provided. In some embodiments, the diagnostic method is a method of diagnosing diastolic dysfunction in the absence of systolic dysfunction in a subject. The method comprises assaying a sample obtained from the subject for evidence of activation of renin-angiontensin system (RAS), evidence of oxidative stress, a level of adiponectin, or a combination thereof, wherein, when there is a lack of evidence of RAS activation, a lack of evidence of oxidative stress, a reduction in the level of adiponectin, or a combination thereof, as compared to a control subject, the subject is diagnosed with diastolic dysfunction in the absence of systolic dysfunction. A method of diagnosing a type of cardiac ventricular dysfunction, a method of determining a therapeutic regimen for a subject suffering from a cardiac ventricular dysfunction and methods of treating diastolic dysfunction in the absence of systolic dysfunction are also provided.
