title: Arterial dysfunction in syndrome X: results of arterial reactivity and pulse wave propagation tests.
abstract: OBJECTIVE
  To assess arterial distensibility using pulse wave velocity (PWV) measurements and its relation with endothelium dependent vasodilatation (EDV) in patients with cardiological syndrome X.
  
  
  METHODS
  The study group consisted of 92 patients: 52 with syndrome X (34 women, 18 men, mean (SD) age 45 (3) years) and 40 healthy volunteer controls (27 women, 13 men, mean (SD) age 41 (2) years) without risk factors of atherosclerosis and with negative ECG exercise test and normal proximal coronaries on transoesophageal echocardiography. Patients with arterial hypertension, diabetes mellitus, valvar disease, or cardiomyopathy were excluded. PWV measured by a Complior Colson device was calculated for each patient. EDV was assessed from two dimensional Doppler measurement using an Acuson Sequoia with 8 MHz linear transducer at rest, during postischaemic reactive hyperaemia, and after an oral dose of 400 micro g of glyceryl trinitrate.
  
  
  RESULTS
  PWV was significantly higher in patients with syndrome X than in healthy subjects (9.3 (0.7) m/s v 8.2 (0.9) m/s, respectively, p < 0.001). Baseline brachial artery diameter was similar in the syndrome X and control groups (4.0 (0.6) mm v 4.08 (0.64) mm, NS). EDV was impaired in patients with syndrome X compared with controls (6.6 (3.0)% v 11.1 (3.9)%, p < 0.001). Endothelium independent vasodilatation was similar in both groups. In patients with syndrome X there was a positive correlation between PWV and the degree of EDV (r = 0.864, p < 0.001). The cut off value for PWV was 8.5 m/s, with a sensitivity of 62% and a specificity of 91%.
  
  
  CONCLUSIONS
  EDV but not glyceryl trinitrate induced vasodilatation is decreased in patients with syndrome X. There is a strong correlation between PWV and the degree of endothelial dysfunction of peripheral arteries in patients with syndrome X. PWV assessment may be useful to identify abnormal vascular physiology in these patients.
authors.affiliation: Department of Cardiology, Medical University of Lodz, Bieganski Hospital, Lodz, Poland. mkidawa@ptkardio.pl
authors.forename: M
authors.initials: M
authors.lastname: Kidawa
authors.forename: M
authors.initials: M
authors.lastname: Krzeminska-Pakula
authors.forename: J Z
authors.initials: JZ
authors.lastname: Peruga
authors.forename: J D
authors.initials: JD
authors.lastname: Kasprzak
mesh_terms: D000328:Adult; D001783:Blood Flow Velocity / Q000502:physiology; D001916:Brachial Artery / Q000503:physiopathology*; D016022:Case-Control Studies; D017023:Coronary Angiography; D004452:Echocardiography; D004730:Endothelium, Vascular / Q000502:physiology; D005260:Female; D006801:Humans; D008297:Male; D017566:Microvascular Angina / Q000503:physiopathology*; D008875:Middle Aged; D011674:Pulse; D014664:Vasodilation / Q000502:physiology