Echocardiogram Doppler of pulmonic stenosis pre- and post-balloon dilation

Note the different scales used to measure velocity on the y-axis. In panel (A): m/s on the y-axis on the left; panel (B): cm/s on the y-axis on the right.
(A) Pre-balloon dilation; this demonstrates the velocity across the pulmonary valve of 6.33 m/s, which correlates to a peak gradient of 160 mmHg across the pulmonary valve.
(B) Post-balloon dilation; this demonstrates the velocity across the pulmonary valve of 2.2 m/s, which correlates to a peak gradient of 19 mmHg across the pulmonary valve.