[…] physicians must maintain vigilance in suspecting pericardial effusion and tamponade in patients with known or suspected malignancy who present with tachycardia, dyspnea, and hypotension
[ncbi.nlm.nih.gov]
Pericardial effusion is initially asymptomatic, but cardiac tamponade has a distinct clinical presentation, including hypotension, tachycardia, jugular venous congestion,
[amboss.com]
Recall Beck's triad of distended neck veins, distant heart sounds, and HYPOtension.
[em.emory.edu]