Figure 5

Figure shows the effect of respiratory phase of Cheyne Stokes breathing on mitral regurgitation severity in a 76 year old female with biv pacemaker. Tachypnea and hyperpnea (green respirogram, A) is associated with increased heart rate between 68–74 bpm (A and B) and significant mitral regurgitation (B), whereas bradypnea (green respirogram, C) is associated with bradycardia (51 bpm, C and D) and a marked reduction in mitral regurgitation severity (D). All recordings were performed during sensed AVD of 50 ms and back up atrial paced rate of 40 bpm.