Differentiation between primary dilated cardiomyopathy and ischemic cardiomyopathy based on right ventricular performance
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A S Iskandrian1, H Helfeld, J Lemlek
1Philadelphia Heart Institute, Presbyterian Medical Center of Philadelphia, PA 19104.
Insights
Differentiating primary dilated cardiomyopathy from ischemic cardiomyopathy can be challenging. This study found that preserved right ventricular function is a strong indicator of ischemic cardiomyopathy in patients with severe left ventricular dysfunction.
Area of Science:
- Cardiology
- Cardiovascular Imaging
- Heart Failure Research
Background:
- Distinguishing primary dilated cardiomyopathy from ischemic cardiomyopathy is clinically significant but challenging.
- Both conditions often present with severe left ventricular dysfunction and wall motion abnormalities.
- Current diagnostic methods may include invasive procedures like coronary angiography or metabolic imaging.
Purpose of the Study:
- To investigate differences in right ventricular (RV) performance between patients with ischemic cardiomyopathy (ICM) and primary dilated cardiomyopathy (DCM).
- To determine if RV function can serve as a non-invasive marker to differentiate these two conditions.
Main Methods:
- Retrospective analysis of 90 patients with left ventricular ejection fraction < 30%.
- All patients underwent coronary angiography and multigated radionuclide angiography (MUGA).
- Measurements included left ventricular ejection fraction (LVEF), right ventricular ejection fraction (RVEF), and RV/LV end-diastolic volume ratios.
Main Results:
- LVEF was similar between ICM (22±6%) and DCM (21±6%) groups.
- RVEF was significantly higher in the ICM group (38±16%) compared to the DCM group (29±12%, p<0.01).
- A higher RV end-diastolic volume/left ventricular end-diastolic volume ratio was observed in DCM (1.07) versus ICM (0.57, p<0.05).
Conclusions:
- Assessment of right ventricular function can aid in differentiating primary dilated cardiomyopathy from ischemic cardiomyopathy.
- Preserved right ventricular performance, indicated by a higher RVEF, is highly suggestive of ischemic cardiomyopathy.
- RV function evaluation offers a potential complementary diagnostic tool alongside traditional methods.
Abstract:
The differentiation of primary dilated cardiomyopathy from ischemic cardiomyopathy, though important, is difficult clinically and may require coronary angiography or metabolic imaging. Both patient groups have severe left ventricular dysfunction and severe wall motion abnormality. This study examined the differences in right ventricular performance between the two groups. There were 90 patients with a left ventricular ejection fraction less than 30% who had coronary angiography and multigated radionuclide angiography (MUGA). Of these, 69 had ischemic cardiomyopathy and 21 had primary cardiomyopathy. The left ventricular ejection fraction was similar; 22 +/- 6% in ischemic cardiomyopathy and 21 +/- 6% in primary cardiomyopathy. However, the right ventricular ejection fraction was higher in ischemic cardiomyopathy (38 +/- 16% versus 29 +/- 12%, p less than 0.01). There were 59 patients with right ventricular ejection fraction greater than or equal to 30%, of whom 50 patients (85%) had ischemic cardiomyopathy. The left ventricular and right ventricular volumes were determined by a count-based method. The right ventricular end-diastolic volume/left ventricular end-diastolic volume ratio was 0.57 in ischemic cardiomyopathy and 1.07 in primary cardiomyopathy (p less than 0.05). Thus assessment of right ventricular function may help differentiate primary from ischemic cardiomyopathy; a preserved right ventricular performance is highly suggestive of ischemic cardiomyopathy.