Summary
Highlights
The video introduces the main pericardial diseases: acute pericarditis, constrictive pericarditis, pericardial effusion, and the critical cardiac tamponade. It explains the basic anatomy of the pericardium and the role of inflammation in these conditions.
Acute pericarditis is often idiopathic but commonly triggered by infections (viral like Coxsackie B, tuberculosis), post-myocardial infarction (fibrinous pericarditis or Dressler syndrome), uremia, radiation therapy, and post-cardiac surgery (post-pericardiotomy syndrome).
The hallmark feature of acute pericarditis is pleuritic, positional chest pain. This pain worsens when lying supine and improves when leaning forward. Other key findings include a pericardial friction rub and potential progression to pericardial effusion or, with repeated inflammation, constrictive pericarditis.
Acute pericarditis can lead to pericardial effusion due to increased serous fluid production. If the effusion grows slowly, the pericardium can stretch, but if it rapidly accumulates or reaches its stretch limit, it can compress the heart, leading to cardiac tamponade. Rapid effusions (hemopericardium) from free wall rupture, aortic dissection, trauma, or surgery are particularly dangerous.
Cardiac tamponade involves increased pericardial pressure, leading to compression of the right atrium and ventricle, which reduces ventricular filling and cardiac output. Clinically, it presents with Beck's Triad: hypotension, jugular venous distension (JVD), and muffled heart sounds. Pulses paradoxus (a significant drop in systolic blood pressure during inspiration) is also a classic finding.
Repeated pericardial inflammation can lead to a fibrotic, rigid pericardium, which inhibits ventricular filling and right heart function. This results in elevated central venous pressure, JVD (often with Kussmaul's sign—JVD that paradoxically increases during inspiration), hepatomegaly, ascites, and pitting edema. A pericardial knock may also be heard.
Diagnosis of acute pericarditis requires at least two of four criteria: pleuritic chest pain, friction rub, classic EKG changes ( diffuse ST elevation, PR depression), and pericardial effusion on echocardiogram. Constrictive pericarditis is diagnosed with echo (thick pericardium, septal bounce), CT/MRI, and cardiac catheterization to differentiate from restrictive cardiomyopathy. Cardiac tamponade is confirmed by echo showing chamber collapse and clinical signs like Beck's Triad and pulses paradoxus.
Acute pericarditis is treated with NSAIDs and colchicine; aspirin/colchicine for post-MI cases. Uremic pericarditis requires dialysis. Constrictive pericarditis often necessitates a pericardiectomy. Pericardial effusion may be observed, but recurrent effusions, especially neoplastic, might require a pericardial window. Cardiac tamponade is an emergency requiring hemodynamic stabilization (IV fluids, vasopressors) and pericardiocentesis to relieve pressure. Hemopericardium requires surgical repair of the underlying cause.