Cerebrovascular and Cardiovascular Changes According to Postural Change in Spinal Cord Injured Patients: Preliminary report.
- Author:
Kyoung Hyo CHOI
1
;
In Young SUNG
;
Sang Bae HA
;
Sun Uck KWON
;
Jae Hong LEE
;
Kee Joon CHOI
;
You Ho KIM
Author Information
1. Department of Physical Medicine & Rehabilitation, Asan Medical Center, University of Ulsan College of Medicine.
- Publication Type:Original Article
- Keywords:
Transcranial doppler sonography;
Spinal cord injury;
Autoregulation;
Cerebral blood flow
- MeSH:
Blood Flow Velocity;
Blood Pressure;
Healthy Volunteers;
Heart Rate;
Hemodynamics;
Homeostasis;
Humans;
Hypotension, Orthostatic;
Middle Cerebral Artery;
Photoplethysmography;
Spinal Cord Injuries;
Spinal Cord*;
Ultrasonography, Doppler, Transcranial
- From:Journal of the Korean Academy of Rehabilitation Medicine
1999;23(4):749-755
- CountryRepublic of Korea
- Language:Korean
-
Abstract:
OBJECTIVE: To investigate the changes of cerebral and cardiovascular hemodynamics in response to postural change in tetraplegics after cervical spinal cord injury. METHOD: We studied 5 healthy volunteers and 14 cervical cord injured patients with orthostatic hypotension. We continuously monitored heart rate (HR), blood pressure (BP) by volume clamp photoplethysmography, and cerebral blood flow velocity (BFV), pulsatility index (PI) of middle cerebral artery (MCA) by transcranial Doppler sonography at rest and during head-up-tilt (HUT). Tilt table set at 30o initially and then increased gradually 10o every 5 minutes up to 80o. RESULTS: In the control group, BP and BFV of MCA remained unchanged during HUT. Although a decrease of BFV observed in all patients during both systolic and diastolic phases, the degree of BFV drop during diastolic phase, especially early diastolic phase was much greater than that during systolic phase. The change of BFV of MCA was significantly correlated with that of systemic hemodynamic parameters, especially systolic BP. After rehabilitative therapy for one month, there was no definite evidence of the change in cerebral autoregulation. CONCLUSION: This study suggests that we can use systemic hemodynamic parameters for predicting changes of cerebral blood flow in response to orthostatic hypotension, but we fail to observe any compensatory mechanism of cerebrovascular system to maintain cerebral blood flow against systemic hemodynamic collapse.
