Shortness of breath due to reduced cardiac output. Chest pain or discomfort, which might worsen with deep breaths or lying down. Tachycardia as the heart attempts to compensate for reduced output. Distended neck veins, indicative of increased venous pressure. Hypotension due to impaired cardiac filling. Muffled heart sounds upon auscultation, known as Beck's triad when combined with hypotension and distended neck veins.
