Figure 2.

Vessel diameter of all 16 patients at baseline, during i. c. infusion of acetylcholine (ACh) with 7.2 μg/min (ACh D1), and with 36 μg/min (ACh D2), during NaCl (0.9% 2 ml/min i. c.), and after 0.2 mg nitrotriglycerin (NTG) i. c. Patients without an elevated IgG serum titer against Chlamydia pneumoniae (CP negative) are presented by dotted lines.