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[Predictive value of myocellular hypertrophy in idiopathic dilated cardiomyopathy]
Insights
Endomyocardial biopsy (EMB) in idiopathic dilated cardiomyopathy (IDCM) reveals that marked myocellular hypertrophy correlates with better hemodynamics. Mild hypertrophy, however, is linked to a poorer prognosis in IDCM patients.
Area of Science:
- Cardiology
- Pathology
Context:
- Idiopathic dilated cardiomyopathy (IDCM) diagnosis often involves endomyocardial biopsy (EMB).
- The prognostic value of histological findings in IDCM remains debated.
- Correlation between myocellular hypertrophy, hemodynamic function, and patient outcomes requires further investigation.
Purpose:
- To evaluate the correlation between histological features from left ventricular EMB and hemodynamic data in IDCM patients.
- To assess the predictive role of histological findings, particularly myocellular hypertrophy and interstitial fibrosis, on patient outcomes in IDCM.
Summary:
- This study analyzed 32 IDCM patients undergoing EMB, correlating light microscopy findings with hemodynamic measurements and long-term outcomes.
- Marked myocellular hypertrophy was associated with significantly lower ventricular pressures compared to mild hypertrophy.
- Interstitial fibrosis showed a positive correlation with myocellular hypertrophy but did not independently predict hemodynamic patterns.
- A mild degree of hypertrophy was identified as a significant predictor of poor outcome via univariate analysis.
Impact:
- Findings suggest that myocellular hypertrophy, assessed via EMB, has implications for hemodynamic status in IDCM.
- The degree of myocellular hypertrophy may serve as a prognostic indicator for IDCM patients.
- This research contributes to understanding the prognostic significance of EMB findings in managing IDCM.
Abstract:
The role of endomyocardial biopsy (EMB) in assessing of idiopathic dilated cardiomyopathy (IDCM) is a well-recognised one. On the contrary, the value of correlating histological features, such as myocellular hypertrophy, with functional evaluation and outcome is still controversial. It was the purpose of the present study to appraise the correlation with hemodynamic data and the predictive role of histological features in 32 consecutive patients affected by IDCM who underwent left ventricular EMB between January 1984 and December 1986. Light microscopy findings were graded by means of a semiquantitative score system. In comparison with the 19 patients with mild myocellular hypertrophy, the 13 patients with marked hypertrophy showed significantly lower right ventricular end-diastolic pressure (10.4 +/- 5.8 vs 6.6 +/- 3.6 mmHg, p less than 0.05) and left ventricular end-diastolic pressure (26.9 +/- 9.0 vs 16.5 +/- 8.8 mmHg, p less than 0.01). On the contrary, different degrees of interstitial fibrosis, as well as of the other morphologic findings, could not identify patients with distinct hemodynamic patterns. However, there was a direct correlation between the amount of myocellular hypertrophy and interstitial fibrosis (p less than 0.01). During a mean follow-up period of 32 +/- 11 months (range: 12-48 months), 6 patients died and 3 further patients underwent heart transplantation. Univariate analysis of histological features (log-rank test) showed a mild degree of hypertrophy alone to be significantly related to a poor outcome (p = 0.02).(ABSTRACT TRUNCATED AT 250 WORDS)