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[QRST isointegral map in dilated cardiomyopathy]
Y Kawakami1, Y Sakai, K Kawamura
1Department of Internal Medicine, Osaka Medical College.
Insights
The QRST isointegral map aids in diagnosing dilated cardiomyopathy (DCM) by detecting late potentials (LP) and localizing perfusion defects. This diagnostic tool offers prognostic value in DCM patient assessment.
Area of Science:
- Cardiology
- Medical Imaging
- Electrocardiography
Background:
- Dilated cardiomyopathy (DCM) diagnosis and prognosis require advanced tools.
- Late potentials (LP) are significant indicators in cardiac conditions.
- Body surface mapping offers detailed electrophysiological insights.
Purpose of the Study:
- To assess the diagnostic and prognostic utility of QRST isointegral mapping in DCM.
- To correlate QRST isointegral map findings with scintigraphy in DCM patients.
Main Methods:
- 41 DCM patients underwent body surface mapping, signal-averaged ECG, and thallium-201 myocardial scintigraphy.
- QRST isointegral subtraction maps were created and analyzed.
- Correlation between map parameters and scintigraphic findings was examined.
Main Results:
- Late potentials (LP) were identified in 41% of DCM patients.
- A significant correlation was found between DImin and QRS voltage (r = -0.435, p < 0.001).
- Specific QRST isointegral map patterns corresponded to distinct scintigraphic perfusion defect locations.
Conclusions:
- The QRST isointegral map is valuable for detecting LP, indicating prognostic significance in DCM.
- The map effectively localizes scintigraphic perfusion defects, providing diagnostic value in DCM.
Abstract:
To evaluate the diagnostic usefulness and prognostic significance of QRST isointegral map in dilated cardiomyopathy (DCM), we performed body surface mapping, signal averaged electrocardiogram and thallium-201 myocardial scintigraphy in 41 DCM patients. Late potentials (LP) were detected in 17 patients (41%). QRST isointegral subtraction map (QRST I-sub map: departure map, calculated from 40 normal subjects) showed -2 standard deviation area and departure indices at minimal point (DImin) were calculated in each case. Significant coefficients of correlation were observed between the DImin and root mean square voltage in last 40 ms (r = -0.435, p < 0.001). The abnormal scintigraphic patterns were discriminated into 3 groups: anteroseptal, inferoapical and posterolateral defects, which revealed separate distribution of minimal point in QRST I-sub map: F-G 4, G-H 2 and I-J 4, respectively. These results suggest that QRST isointegral map is useful for detecting the presence of LP (prognostic value) and the location of scintigraphic perfusion defect (diagnostic value) in DCM.