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Cardiac sarcoidosis: diagnostic, prognostic, and therapeutic considerations
M Sekiguchi1, Y Yazaki, M Isobe
11st Department of Internal Medicine, Shinshu University School of Medicine, Matsumoto City, Japan.
Insights
Cardiac sarcoidosis is often overlooked but can lead to fatal heart issues. Early detection via ECG and Holter monitoring, along with corticosteroid treatment, can improve outcomes for patients with this condition.
Area of Science:
- Cardiology
- Pulmonology
- Pathology
Background:
- Cardiac sarcoidosis is a significant, often overlooked, cause of mortality in sarcoidosis patients.
- Subclinical progression and low sensitivity of endomyocardial biopsy contribute to diagnostic challenges.
- Potential racial differences in cardiac sarcoidosis incidence, particularly higher mortality in Japanese patients, warrant further investigation.
Purpose of the Study:
- To review literature and case analyses on cardiac sarcoidosis, focusing on diagnosis, clinical presentation, and management.
- To reevaluate the role of cor pulmonale in sarcoidosis-related heart disease.
- To highlight effective early detection methods and prognostic factors.
Main Methods:
- Literature review and analysis of author's case studies.
- Evaluation of endomyocardial biopsy sensitivity (20-30%) for detecting sarcoid granuloma.
- Analysis of electrocardiographic (ECG) abnormalities in 963 sarcoidosis patients compared to controls.
Main Results:
- Cardiac sarcoidosis results from myocardial or pericardial involvement, causing arrhythmias and heart failure.
- ECG abnormalities were more frequent in sarcoidosis patients (22.1%) than in controls (17.9%).
- Congestive heart failure has become the primary cause of death, replacing sudden death, due to advances in treatment.
Conclusions:
- Early detection of cardiac sarcoidosis is crucial, with ECG and Holter monitoring being effective tools.
- Corticosteroid therapy, followed by maintenance doses, can prevent disease progression.
- Advances in antiarrhythmic drugs and pacemakers have shifted the primary cause of mortality from sudden death to heart failure.
Abstract:
Cardiac involvement in patients with sarcoidosis is an important consideration for those who are concerned with this strange disease. Sarcoidosis is not an acute malignant disease but may be noticed at the time of sudden, expected death as fatal myocardial sarcoidosis at autopsy. Even with modern advances in our ability to diagnose heart disease, cardiac sarcoidosis is still often overlooked because of its subclinical disease progression. In view of this, an extensive review of previously published literature and of our own case analyses has been carried out because of the authors' long-term experience with performing Konno's endomyocardial biopsy, which was originally developed in 1962 at the author's institution. However, the sensitivity of endomyocardial biopsy in detecting sarcoid granuloma is low (20-30%), and, instead, various kinds of nongranulomatous pathologies are often seen. During the course of our research it was found that there might exist a racial difference in cardiac sarcoidosis. Cardiac death was much more frequent in Japanese patients. The possibility that heart disease in sarcoidosis is caused by cor pulmonale due to advanced pulmonary fibrosis should be reevaluated because only a limited amount of background data is available. The author's review clarified the fact that cardiac sarcoidosis is caused by myocardial or pericardial involvement, resulting in various kinds of bradyarrhythmias or tachyarrhythmias and/or congestive heart failure. Electrocardiographic (ECG) and Holter monitor readings provide a simple and effective method for early detection of this disease. The incidence of ECG abnormalities in a total of 963 sarcoidosis patients was 22.1%, which was more frequent than that of the sex- and age-matched healthy control subjects (17.9%; p < 0.025). Echocardiography and radionuclide studies also provide useful clinical information. Careful follow-up and early corticosteroid administration followed by small maintenance doses may prevent the progression of the disease and improve prognosis. Owing to the progress in antiarrhythmic drugs and pacemaker implantation, the primary cause of death in cardiac sarcoidosis has changed from sudden death (1976 report) to congestive heart failure (1985 report).