Intracardiac hemodynamic tracings showing acute cardiac tamponade

The radial arterial tracing shows tachycardia and extreme pulsus paradoxus. The right atrial and pericardial pressures are equally elevated, but the amount of effusion was very small. Note deeper y descent in the pericardial pressure compared with the right atrial pressure. ECG shows low voltage. Heavy time markings = 1 second.