Fig. 6.

Coronary flow assessment and non-invasive wave-intensity analysis at increasing heart rates. Rest is displayed on the left, mid-exertion centrally and maximum exertion on the right. With exercise and a resultant increasing heart rate a progressive increase is seen in the in size of the cumulative and peak backward decompression wave. This reflects a greater ‘suction’ effect from the myocardium resulting in higher coronary flow rates per cardiac cycle. HR heart rate. Reproduced from Broyd et al. [5]