title: Lack of association between QT dispersion and blood pressure response during dental surgery.
abstract: 1. It is well known that dental surgery induces increases in blood pressure. However, the factors influencing this increase are not yet fully understood. We have determined the relationship between QTc (= QT/RR(1/2), with RR being the R-R interval in seconds) dispersion, measured with a 12-lead surface electrocardiogram, and changes in blood pressure during tooth extraction. 2. Both QTc dispersion and the power spectrum of R-R variability were determined before the dental surgery was undertaken. The low-frequency (LF; 0.041-0.140 Hz), high- frequency (HF; 0.140-0.500 Hz) and total spectral powers (TF; 0.000-4.000 Hz) were calculated and the ratio of LF to HF and the percentage of HF relative to TF (%HF; HF/TF x 100) were used as indices of sympathovagal balance and parasympathetic activities, respectively. 3. In the present study, QTc dispersion failed to correlate with LF/HF and %HF. Systolic blood pressure and pulse rate increased significantly during tooth extraction; however, changes in these variables failed to correlate with QTc dispersion. 4. These results suggest that QTc dispersion is not associated with the power spectrum of R-R variability and that it does not affect the blood pressure response during tooth extraction.
authors.affiliation: Department of Internal Medicine, Kyushu Dental College, Kitakyushu, Japan. matsumk@intmed2.med.kyushu-u.ac.jp
authors.forename: K
authors.initials: K
authors.lastname: Matsumura
authors.forename: K
authors.initials: K
authors.lastname: Miura
authors.forename: H
authors.initials: H
authors.lastname: Kurokawa
authors.forename: I
authors.initials: I
authors.lastname: Abe
authors.forename: Y
authors.initials: Y
authors.lastname: Takata
mesh_terms: D000328:Adult; D000368:Aged; D001794:Blood Pressure / Q000502:physiology*; D003971:Diastole / Q000502:physiology; D004562:Electrocardiography; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D013599:Systole / Q000502:physiology; D014081:Tooth Extraction