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[Systemic mastocytosis with myo-pericardial localization and atrioventricular block]
Insights
This report details a rare case of systemic mastocytosis affecting the heart, leading to atrioventricular block and pericardial effusion. The findings highlight the critical need to consider cardiac complications in mastocytosis patients.
Area of Science:
- Cardiology
- Hematology
- Pathology
Background:
- Systemic mastocytosis (SM) is a rare disorder characterized by abnormal mast cell proliferation.
- Cardiac involvement in SM is uncommon but can lead to severe complications.
Observation:
- A 46-year-old male with SM presented with skin, bone, and medullary lesions.
- He also exhibited atrioventricular block and pericardial effusion, confirmed histologically via open biopsy.
Findings:
- Histological examination revealed myocardial and pericardial mast cell infiltration.
- The atrioventricular conduction defect is hypothesized to be due to histamine's negative dromotropic effect and mast cell-mediated fibrosis.
Implications:
- This case underscores the importance of evaluating cardiac function in patients with systemic mastocytosis.
- Further research is needed to elucidate the precise mechanisms of histamine's effects on the myocardium in pathological conditions.
Abstract:
The case of a 46 year old man with systemic mastocytosis with myocardial and pericardial involvement confirmed histologically after open biopsy is reported. The patient presented with skin, bone and medullary lesions and, in addition, with atrioventricular block and pericardial effusion. The possible mechanisms of the atrioventricular conduction defect are examined in the light of the physiological role of the mastocyte and research into the action of histamine on the myocardium. In particular, the negative dromotropic effect of histamine and fibrosis formation related to the mastocyte's function of connective tissue regeneration are discussed. This case, though rare, should alert the clinician to the possibility of myocardial and pericardial involvement in patients with mastocytosis. Further study into the effects of histamine on myocardium under physiological and pathological conditions is required.