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

Figure 2 The distal pressure/aortic pressure ratio at baseline in lesions with no coronary spasm in response to spasm provocation test (group N), lesions in which coronary spasm was induced by a low dose of acetylcholine (group L), and lesions in which coronary spasm was induced by a moderate or high-dose acetylcholine (group MH). This value was lower in group L than in groups MH and N. ACh: Acetylcholine; Pa: Aortic pressure; Pd: Distal pressure; SPT: Spasm provocation test.