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Prognostic value of thallium-201 perfusion defects in idiopathic dilated cardiomyopathy
Y L Doi1, T Chikamori, J Tukata
1Department of Medicine and Geriatrics, Kochi Medical School, Japan.
Insights
Thallium-201 perfusion defects in idiopathic dilated cardiomyopathy (IDC) predict disease mortality. Patients with abnormal thallium scans, especially large defects, face significantly higher mortality risks compared to those with normal scans.
Area of Science:
- Cardiology
- Nuclear Cardiology
- Cardiovascular Imaging
Background:
- Idiopathic dilated cardiomyopathy (IDC) is a significant cause of heart failure.
- Prognostic markers are crucial for managing IDC patients.
- Thallium-201 scintigraphy assesses myocardial perfusion and can reveal abnormalities.
Purpose of the Study:
- To evaluate the prognostic value of thallium-201 perfusion defects in patients with IDC.
- To determine if perfusion abnormalities correlate with disease-related mortality and clinical outcomes.
Main Methods:
- 43 IDC patients underwent thallium-201 scintigraphy.
- Patients were also assessed clinically, echocardiographically, angiographically, and hemodynamically.
- Survival data was collected over a mean follow-up of 3.2 years.
Main Results:
- Patients who died showed a higher incidence of ventricular tachycardia, increased cardiothoracic ratio, reduced fractional shortening, and elevated filling pressures.
- Abnormal thallium perfusion defects were significantly more common in non-survivors (13/14) compared to survivors (16/26).
- Kaplan-Meier survival rates were significantly lower for patients with multiple small or large perfusion defects compared to those with normal scans (p < 0.025).
Conclusions:
- Thallium-201 perfusion defects are significant predictors of mortality in idiopathic dilated cardiomyopathy.
- The extent and severity of perfusion abnormalities correlate with poorer prognosis.
- Nuclear cardiology imaging, specifically thallium scintigraphy, provides valuable prognostic information in IDC management.
Abstract:
To assess the prognostic significance of thallium-201 perfusion defects in patients with idiopathic dilated cardiomyopathy (IDC), 43 patients underwent thallium scintigraphy in addition to clinical, echocardiographic, angiographic and hemodynamic evaluation. Eleven patients had no significant thallium perfusion abnormality, 19 had multiple small defects and 13 had a large defect. During 3.2 +/- 2.2 years, 14 patients had disease-related mortality. The patients who died had a higher incidence of ventricular tachycardia (71 vs 31%; p less than 0.02), increased cardiothoracic ratio (60 +/- 6 vs 54 +/- 6; p = 0.005), decreased fractional shortening (11 +/- 6 vs 15 +/- 5; p less than 0.05), increased pulmonary wedge pressure (15 +/- 7 vs 10 +/- 6 mm Hg; p = 0.05), increased left ventricular end-diastolic pressure (21 +/- 8 vs 14 +/- 6 mm Hg; p = 0.02) and abnormal thallium perfusion defects (13 of 14 vs 16 of 26; p less than 0.05) compared with survivors. Age, gender, left ventricular end-systolic and end-diastolic dimensions, cardiac index and ejection fraction were not statistically different in the survivors versus the patients who died. Kaplan-Meier survival estimates at 1, 3 and 5 years were 100% in patients without significant perfusion abnormality; 89, 77 and 64%, respectively, in patients with multiple small defects; and 84, 76 and 30%, respectively, in patients with a large defect (p less than 0.025 by log rank test).(ABSTRACT TRUNCATED AT 250 WORDS)