A nurse is assessing a client who is postoperative following a coronary artery bypass graft surgery. The nurse should identify that which of the following findings is an early indication of cardiac tamponade?

A. Muffled heart sounds: Muffled or distant heart sounds occur due to accumulation of fluid in the pericardial sac, which dampens the transmission of heart sounds. This is an early and classic manifestation of cardiac tamponade, reflecting impaired ventricular filling and reduced stroke volume. Prompt recognition is critical to prevent hemodynamic compromise. B. Decreased jugular vein distention: Cardiac tamponade typically causes increased jugular vein distention due to impaired right atrial filling and elevated central venous pressure. A decrease in jugular venous distention would be inconsistent with this condition. C. Widening pulse pressure: Cardiac tamponade usually produces a narrowing pulse pressure due to reduced stroke volume and systolic pressure, rather than widening. A widened pulse pressure is more characteristic of conditions like aortic regurgitation. D. Coarse lung sounds: Coarse lung sounds are associated with pulmonary edema or fluid in the alveoli, not with pericardial tamponade. Lung sounds are often normal in early tamponade unless concurrent pulmonary complications are present.