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 Indian J Med Microbiol  
 

Figure 3 (A-D): (A) Color Doppler USG shows an aliasing artifact. Spectral Doppler USG taken on (B) inspiration and (C) expiration. Significantly elevated peak systolic velocity is seen on expiration. Spectral Doppler measurements in erect position (D) show normal peak systolic and end-diastolic velocities

Figure 3 (A-D): (A) Color Doppler USG shows an aliasing artifact. Spectral Doppler USG taken on (B) inspiration and (C) expiration. Significantly elevated peak systolic velocity is seen on expiration. Spectral Doppler measurements in erect position (D) show normal peak systolic and end-diastolic velocities