Tuberculous pericarditis and the cardiac conduction system

Area of Science:

• Cardiology
• Infectious Diseases
• Pathology

Background:

• Tuberculous pericarditis is an inflammation of the pericardium caused by tuberculosis.
• The involvement of cardiac structures, particularly the sinoatrial (S-A) node, in tuberculous pericarditis is not well-documented.
• Understanding this involvement is crucial for managing potential cardiac complications.

Purpose of the Study:

• To investigate the extent of epicardial structure involvement in tuberculous pericarditis.
• Specifically examining the S-A node, A-V node, and coronary arteries in both acute and chronic cases.

Main Methods:

• Histopathological examination of epicardial structures from 17 patients with tuberculous pericarditis (9 acute, 8 chronic).
• Assessment for caseation, granuloma formation, fibrosis, and inflammatory cell infiltration in the S-A node, A-V node, and coronary arteries.

Main Results:

• Extensive caseation and loss of nodal tissue in the S-A node region occurred in 3 cases (2 chronic, 1 acute).
• Granuloma with fibrosis was observed in one chronic case; minor mononuclear infiltration in two cases.
• The S-A node was otherwise normal, but inflammation was adjacent in 4 acute and all chronic cases.
• The A-V node, bundle of His, and coronary arteries showed no abnormalities.

Conclusions:

• Tuberculous pericarditis can lead to significant S-A node pathology, including destruction of nodal tissue.
• While other investigated structures were spared, S-A node involvement may contribute to arrhythmias in tuberculous pericarditis.
• Further research is needed to correlate these findings with clinical electrophysiological outcomes.