Abstract
The purpose of this study was to determine the relationship between Pulse Wave Velocity (PWV) and hemodynamic change induced by postural change on dental chair in bed-ridden elderly.
20 patients with cardiovascular diseases, scheduled to receive bloodless dental treatment were selected as the subjects of the study. Subjects were divided into two groups: 10 cases of group N (mean value for each age ≥±1×Standard Deviation) and 10 cases of group H (mean value for each age≥±1×Standard Deviation) based on resting brachial-ankle PWV (baPWV).
ABI-formTM was used for measurement of PWV. Posture was changed from horizontal position to sitting position before the start of dental treatment. Blood pressure and pulse rate were measured continuously.
As the result, both groups did not show significant differences in terms of age, sex, blood pressure and pulse rate except for baPWV. Both groups showed significant decrease of systolic blood pressure and diastolic blood pressure when the posture was changed from horizontal position to sitting position. Furthermore, systolic blood pressure was significantly different between group N (123.4±17.5 mmHg) and group H (107.7 ± 18.1 mmHg) during sitting position.
There was significant difference in recovery time between group N (94.0±24.5 seconds) and group H (169.0±40.1 seconds).
Both groups did not show significant differences in pulse rate during the postural change. Difference of pulse rate between these groups was not significant also.
This study indicated the fact that physiological increase of pulse rate along with decrease in blood pressure was not likely to occur for bedridden people unlike the cases for normal subjects. This fact indicates the necessity of close attention to the decrease in blood pressure not only during dental treatment, but also during postural change.
This study suggested that in the case of bedridden people, baPWV is related to the hemodynamic change induced by postural change, thus it can be an effective index for prediction of hemodynamic change.
