Do changes in intracoronary pressure aid coronary spasm diagnosis using the spasm provocation test?

Figure 3 The distal pressure/aortic pressure ratio at low doses of acetylcholine and Pd/Pa between baseline and low doses of acetylcholine in the three coronary spasm groups. A: Shows distal pressure/aortic pressure (Pd/Pa) at low doses of acetylcholine (ACh). The value was lowest in group L and highest in group N; B: Shows the Pd/Pa between baseline and low doses of ACh. This value was also lowest in group L and highest in group N. ACh: Acetylcholine; Pa: Aortic pressure; Pd: Distal pressure.