Table 2. Criteria for defining pericardial tamponade.

Criteria for pericardial tamponade
A	systemic hypotension (systolic blood pressure less than 90 mm/hg)
B	fluid collection in the pericardium, major respiratory change in trans-mitral velocity of doppler, inspiration leads to the collapse of dilated inferior venacava detected on echocardiogram
C	pericardial space is filled with a significant collection of dye detected by angiogram