Clinical meaning
Cardiac tamponade occurs when fluid (blood, effusion, or pus) accumulates in the pericardial sac surrounding the heart, compressing the cardiac chambers and preventing adequate filling during diastole. As intrapericardial pressure rises, stroke volume and cardiac output fall rapidly. The classic presentation is Beck's triad: hypotension, muffled heart sounds, and jugular venous distension. The nurse must recognize these signs, monitor vital signs as directed, and report changes immediately to the nurse or provider.
Exam relevance
Risk factors: - Penetrating chest trauma or cardiac surgery - Pericarditis (viral, bacterial, uremic) - Malignancy with pericardial metastasis - Aortic dissection extending into pericardium - Post-myocardial infarction (Dressler syndrome) - Anticoagulant therapy - Central line placement complications - Autoimmune diseases (lupus, rheumatoid arthritis)
Diagnostics: - Monitor vital signs frequently and report hypotension or tachycardia - Report muffled or distant heart sounds on auscultation - Observe for jugular venous distension - Monitor oxygen saturation and report desaturation - Report patient complaints of chest pressure or dyspnea - Monitor urine output and report if decreased