Biventricular pulsus alternans: An echocardiographic finding in patient with pulmonary embolism

Figure 2 M-mode tracing. A: Beat to beat marked variation of continuous wave Doppler blood flow velocities of tricuspid regurgitation indicative of right ventricular pulsus alternans; B: Beat to beat marked variations of continuous wave Doppler blood flow velocities of left ventricular outflow tract indicative of left ventricular pulsus alternans; C: M-mode tracing showing beat to beat marked variation of aortic valve opening indicative of left ventricular pulsus alternans; D: M-mode tracing showing beat to beat marked variation of mitral valve opening indicative of left ventricular pulsus alternans.