A pаtient is pоstоperаtive dаy оne following an emergent pericardial window for a hemorrhagic pericardial effusion. The nurse enters the room to find the patient increasingly restless and short of breath. Blood pressure has dropped from 118/76 an hour ago to 82/60 now, with a narrowed pulse pressure. Heart rate has climbed to 128, and heart sounds are notably muffled and distant on auscultation compared to the prior assessment. The nurse notes the neck veins are visibly distended, and while manually checking blood pressure, observes the systolic reading drops by nearly 14 mmHg during inspiration. The mediastinal chest tube, which had been draining briskly, has put out only 5 mL over the last two hours. The nurse recognizes that this patient is exhibiting the classic findings of Beck's triad, which are: [BLANK-1]