This is an early diastolic still-frame of a two-dimensional echocardiogram in the parasternal long axis view that clearly shows a pericardiocentesis needle located anteriorly within a large pericardial effusion. The right ventricular wall is literally collapsed against the ventricular septum. The remaining right ventricular cavity is quite small.
The left ventricle, left atrium and the aortic and mitral valves are identified.
In the real-time study that follows, note the exaggerated motion of the right ventricle as it collapses in mid diastole. The needle is seen to move slightly within the pericardial fluid. The motions of the normal aortic and mitral valves identify the phases of the cardiac cycle.