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

Figure 4 The results of a receiver-operating characteristics analysis of the data from this study. A: Shows the cutoff value of the distal pressure/aortic pressure (Pd/Pa) ratio at baseline for the prediction of coronary spasms induced by low doses of acetylcholine (ACh); B: Shows the cutoff value of the Pd/Pa between baseline and low-doses ACh. ACh: Acetylcholine; Pa: Aortic pressure; Pd: Distal pressure; ROC: Receiver-operating characteristics; AUC: Area under the curve.