CVPR 04-04-14 08-09am Pericardial Disease slides - Horwitz Flashcards
Pericardium defn./structure
A fibroelastic sac w/visceral & parietal layers….. The visceral layer dirtectly abuts the epicardium (outer portion of the myocardium) and is contiguous w/the pleura around the lungs…..A very small quantity of fluid is normally present between the two layers (in the pericardial space); However, in certain diseases, large quantities of fluid may accumulate there.
Four types of pericardial disease:
- Acute Pericarditis …. 2. Pericardial Effusion w/out hemodynamic compromise …. 3. Cardiac tamponade (excessive pericardial fluid compresses heart & reduces CO = acute emergency)…. 4. Constrictive Pericarditis (chronic process where pericardium thickens until it compresses the heart & limits CO)
Acute Pericarditis – Causes
Viral illness, CT/autoimmune disease, Uremia, Metastatic tumors
Acute Pericarditis – Presentation
Chest pain of sudden onset, often severe & sharp, varying w/position & breathing
Acute Pericarditis – Dx
Chest pain varies w/position & breathing…. Pericardial rub on cardiac exam (crackling/rubbing that sounds like it’s right up in your ears) that appear & disappear… EKG: Diffuse ST elevation…. ECHO: Pericardial fluid…. Response to anti-inflammatory agents
Acute Pericarditis on EKG
ST segment is elevated (= injury) involving most of the heart (diffuse)
Acute Pericarditis – Treatment
NSAID of choices: Ibuprofen….. other NSAIDs…. Aspirin….. Colchicine
Pericardial effusion – Causes
Viral or acute idiopathic pericarditis, Metastatic malignancy, Uremia, Autoimmune disease, HypOthyroidism
Pericardial effusion – mechanism of pericardial tamponade
While small pericardial effusions may be asymptomatic, moderate to large effusions cause high intrapericardial pressure —> compression & impaired filling of the right heart —> decreased right ventricular output [lungs are NOT congested] —> Inspiration decreases pressure, allowing increased RV filling, but since it can’t expand in the free wall, it impinges on the LV —> decreased stoke volume, paradoxical pulse, fall in systolic pressure during inspiration, ACUTE EMERGENCY
Pericardial effusion – Symptoms
Asymptomatic w/small effusion & minimal intrapericardial pressure…. Cardiac tamponade w/ large effusion & high intrapericardial pressure = decrease SV, paradoxical pulse w/fall in systolic pressure >10mmHg during inspiration (EMERGENCY)….. NO wet lung symptoms
Pericardial effusion – Dx
Best diagnosed by X-ray or esp. Echocardiogram; Also ECG findings…. X-ray = Enlarged heart W/OUT congested lung field…. ECHO: Collapse of Rt. Atrium and Rt. Ventricle in end-diastole + Dilation of inferior vena cava w/out the normal >50% reduction during inspiration (intrapericardial & venous pressures are very high)….. ECG: Nonspecific = Low voltage w/sinus tachycardia + Electrical alternans reflecting movement of heart back & forth w/in sea of fluid w/each beat (seen as decreased QRS every other beat)
Pericardial effusion/tamponade vs. Dilated cardiomyopathy
Pericardial effusion/tamponade presents with enlarged heart and UN-CONGESTED lungs (b/c of decreased RV output as a result of pressure)….. Dilated cardiomyopathy presents with a dilated heart associated w/pulmonary venous congestion, edema, etc.
Constrictive Pericarditits – Mechanism/Pathophysiology
Cardiac surgery, Radiation, Infection —> SCARRING & LOSS of ELASTICITY of the pericardium (usually takes time to develop, even years) —> Impaired diastolic filling w/normal systolic function
Constrictive Pericarditits –Presentation
MARKEDLY elevated JVP (some of the highest you’ll see)….. ALWAYS Tachycardia….. often Hepatomegaly, Edema, Ascites (from hig venous pressure; often misdiagnosed as liver disease)….. Lungs NOT congested b/c constriction selectively impairs filling of RV (low output)
Constrictive Pericarditits –Dx
Echocardiogram or X-ray ….. Normally-size cardiac silhouette encased by thickened (or calcified) pericardium; Lungs NOT congested (selective RV filling impairment)….. MRI/CT also see pericardial thickening