Click on image to view larger version.

Figure 1 Top: Representative pulsed Doppler myocardial recordings of the basal inferior wall in a control subject at rest (left) and during peak dobutamine stress (right) with stress induced increase of both systolic and diastolic peak velocities. Heart rate increased from 91 to 149 beats/min. Middle: Same setting of pulsed Doppler myocardial recordings of the basal anterior septum in a patient with 50% stenosis of the left anterior descending coronary artery with a stress induced decrease of early diastolic peak velocity from –9 to –5 cm/s. Bottom: Same setting of pulsed Doppler myocardial recordings of the basal inferior wall in a patient with 75% stenosis of the right coronary artery with a stress induced decrease of peak velocity during early diastolic filling from –9 to –6 cm/s.