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Prognosis of dilated cardiomyopathy: from a retrospective to a prospective study employing multivariate analysis
S Ogasawara1, M Sekiguchi, M Hiroe
1Heart Institute of Japan, Tokyo Women's Medical College.
Insights
This study identified key prognostic factors for dilated cardiomyopathy (DCM) using multivariate analysis. The developed prognostic score effectively predicted outcomes, particularly for patients with refractory heart failure.
Area of Science:
- Cardiology
- Internal Medicine
- Medical Research
Background:
- Dilated cardiomyopathy (DCM) is a significant cause of heart failure.
- Identifying prognostic factors is crucial for patient management and treatment strategies.
Purpose of the Study:
- To determine the prognostic factors associated with dilated cardiomyopathy (DCM).
- To develop and validate a prognostic score for DCM patients.
Main Methods:
- Retrospective analysis of 111 DCM patients diagnosed between 1967 and 1983.
- Multivariate analysis incorporating New York Heart Association classification, cardiothoracic ratio, electrocardiographic findings, and cardiac function.
- Principal component analysis to visualize patient subgroups and outcomes.
Main Results:
- A prognostic score was constructed using key clinical and functional parameters.
- The score effectively differentiated between sudden death, death from heart failure, and refractory heart failure.
- 82% of patients in the high-risk refractory heart failure group died within one year, validating the score's efficacy.
Conclusions:
- Multivariate analysis provides an effective method for determining prognosis in dilated cardiomyopathy.
- The developed prognostic score accurately predicts patient outcomes, aiding in clinical decision-making.
- Early identification of high-risk patients allows for timely intervention and improved management of DCM.
Abstract:
To determine the prognostic factors of dilated cardiomyopathy (DCM), a retrospective long-term investigation of 111 patients seen between 1967 and 1983 was carried out. Fifty-four deaths were divided into 3 subgroups: (1): sudden death (n = 6); (2): sudden death on the basis of heart failure (n = 17); (3): refractory heart failure death (n = 31). Multivariate analysis was employed to ascertain the prognostic score, which was constructed from the grading of the New York Heart Association functional classification, the cardiothoracic ratio, electrocardiographic findings and cardiac function. Individual variables were indicated on the first (I) and second (II) principal component axes. The mean center points for the death modes were as follows: (1): I = -0.4, II = +0.8, (2): I = +0.7, II = +1.1, (3): I = +1.4, II = -0.8. Surviving cases (n = 57) showed I = -0.6, II = +0.1. Forty-one cases examined during 1984-1985 were analyzed to evaluate the prognostic efficacy of this score. Fourteen of 17 cases (82%) located in the refractory heart failure death group died within one year after determination of the prognosis, showing thereby that the prognostic determination by multivariate analysis is effective.