Diagnostic imaging reveals that the quantity of fluid in a client's pericardial sac is dangerously increased. The nurse should collaborate with the other members of the care team to prevent the development of which complication?

Choice A rationale Pulmonary edema occurs when fluid backs up into the lungs, usually due to left-sided heart failure. While pericardial fluid can affect heart function, pulmonary edema is not the most immediate or direct complication of fluid accumulation within the pericardial sac itself. Instead, the fluid in the sac creates external pressure on the heart. The focus of care for increased pericardial fluid is the restriction of cardiac filling rather than the primary congestion of the pulmonary vasculature. Choice B rationale Cardiac tamponade is a life-threatening condition where the accumulation of fluid in the pericardial sac increases intrapericardial pressure. This pressure prevents the heart chambers from expanding fully during diastole, which severely reduces stroke volume and cardiac output. Common signs include Beck's triad: hypotension, jugular venous distention, and muffled heart sounds. Immediate intervention is required because the heart can eventually stop beating entirely as it becomes unable to fill with blood due to external compression. Choice C rationale Pericarditis is the inflammation of the pericardium, which is often the underlying cause of fluid accumulation, known as pericardial effusion. While the nurse monitors for signs of inflammation, the question asks for a complication resulting from the fluid being dangerously increased. Pericarditis is the state of the tissue rather than the acute hemodynamic consequence of fluid volume. Therefore, preventing the functional collapse of the heart takes precedence over managing the inflammatory process in an emergency. Choice D rationale Pericardiocentesis is a medical procedure used to drain excess fluid from the pericardial sac to relieve pressure on the heart. It is a treatment modality rather than a complication. The nurse collaborates with the team to perform this procedure in order to treat or prevent cardiac tamponade. Since the question asks for a complication to prevent, choosing a treatment is logically incorrect. The goal is to avoid the physiological crisis that necessitates such an invasive intervention.