Figure 6From: Novel insights on effect of atrioventricular programming of biventricular pacemaker in heart failure – a case seriesCW Doppler across tricuspid inflow is shown during hyperpneac phase (A and B) and during hypopnea (C and D). Green graph in each panel is the respirogram. Note tricuspid regurgitation velocity increase during expiration and decrease during inspiration in A and B that is decreased at the onset of hypopnea in C and abolished during hypopnea in D.Back to article page