title: Increased P wave dispersion: a new finding in patients with syndrome X.
abstract: The present clinical study was undertaken in patients with syndrome X, namely angina with normal coronary arteries, to investigate the presence of increased P wave dispersion by comparing patients with coronary artery disease (CAD) and healthy control subjects. Three groups were studied - group A, 21 patients (48 6 years) with syndrome X; group B, 16 patients (56 9 years) with CAD; and group C, 16 healthy subjects (49 8 years). Patients with CAD were older than those in groups A and C (P=0.005 and P=0.035, respectively). All groups demonstrated similar PQ, QRS and RR intervals. Group B had a lower minimum P wave duration than group C (P=0.05). P wave dispersion in group A was found to be higher than that in groups B and C (P=0.018 and P=0.0001, respectively). Patients with syndrome X demonstrated increased P wave dispersion compared to patients with CAD and healthy subjects. High sympathetic tone or autonomic imbalance observed in patients with syndrome X may affect intra-atrial and interatrial conduction times, and leave them prone to develop atrial arrhythmias.
authors.affiliation: Trakya University, Edirne, Turkey. altun@medscape.com
authors.forename: Armagan
authors.initials: A
authors.lastname: Altun
authors.forename: Okan
authors.initials: O
authors.lastname: Erdogan
authors.forename: Ersan
authors.initials: E
authors.lastname: Tatli
authors.forename: Betul
authors.initials: B
authors.lastname: Ugur-Altun
authors.forename: Gulay
authors.initials: G
authors.lastname: Durmus-Altun
authors.forename: Gultac
authors.initials: G
authors.lastname: Ozbay
mesh_terms: D016022:Case-Control Studies; D003327:Coronary Disease / Q000503:physiopathology*; D004562:Electrocardiography; D005260:Female; D006801:Humans; D008297:Male; D017566:Microvascular Angina / Q000503:physiopathology*; D008875:Middle Aged; D013564:Sympathetic Nervous System / Q000503:physiopathology