STUDY DESIGN: It is well known that changes of the body temperature as well as trauma influence the blood flow in the brain and spinal cord. However, there is still a lack of knowledge concerning the levels of blood flow changes, especially during hypothermia. OBJECTIVES: This investigation was carried out to examine the effects of systemic hypothermia and trauma on spinal cord blood flow (SCBF). METHODS: Twenty-four rats were randomized either to thoracic laminectomy only (Th VII-IX) or to 35 g spinal cord compression trauma. The animals were further randomized to either constant normothermia (38 degrees C) or to a systemic cooling procedure, ie reduction of the esophageal temperature from 38 to 30 degrees C. SCBF was recorded 5 mm caudal to the injury zone using Laser-Doppler flowmetry which allows a non-invasive continuous recording of local changes in the blood flow. The autoregulation ability was tested at the end of the experiments by inducing a 30-50 mmHg blood-pressure fall, using blood-withdrawal from the carotid artery. RESULTS: The mean SCBF decreased 2.8% and 3.5% per centigrade reduction of esophageal temperature in the animals sustained to hypothermia with and without trauma, respectively. This could be compared to a decrease of 0.2%/min when only trauma was applied. No significant differences were seen between the groups concerning auto regulatory ability. CONCLUSIONS: Our results indicate that the core temperature has a high impact on the SCBF independent of previous trauma recorded by Laser-Doppler flowmetry. This influence exceeds the response mediated by moderate compression trauma alone.
STUDY DESIGN: It is well known that changes of the body temperature as well as trauma influence the blood flow in the brain and spinal cord. However, there is still a lack of knowledge concerning the levels of blood flow changes, especially during hypothermia. OBJECTIVES: This investigation was carried out to examine the effects of systemic hypothermia and trauma on spinal cord blood flow (SCBF). METHODS: Twenty-four rats were randomized either to thoracic laminectomy only (Th VII-IX) or to 35 g spinal cord compression trauma. The animals were further randomized to either constant normothermia (38 degrees C) or to a systemic cooling procedure, ie reduction of the esophageal temperature from 38 to 30 degrees C. SCBF was recorded 5 mm caudal to the injury zone using Laser-Doppler flowmetry which allows a non-invasive continuous recording of local changes in the blood flow. The autoregulation ability was tested at the end of the experiments by inducing a 30-50 mmHg blood-pressure fall, using blood-withdrawal from the carotid artery. RESULTS: The mean SCBF decreased 2.8% and 3.5% per centigrade reduction of esophageal temperature in the animals sustained to hypothermia with and without trauma, respectively. This could be compared to a decrease of 0.2%/min when only trauma was applied. No significant differences were seen between the groups concerning auto regulatory ability. CONCLUSIONS: Our results indicate that the core temperature has a high impact on the SCBF independent of previous trauma recorded by Laser-Doppler flowmetry. This influence exceeds the response mediated by moderate compression trauma alone.
Authors: Zin Z Khaing; Lindsay N Cates; Jeffrey E Hyde; Ryan Hammond; Matthew Bruce; Christoph P Hofstetter Journal: Spinal Cord Date: 2020-01-21 Impact factor: 2.772
Authors: Brian K Kwon; Elena Okon; Jessica Hillyer; Cody Mann; Darryl Baptiste; Lynne C Weaver; Michael G Fehlings; Wolfram Tetzlaff Journal: J Neurotrauma Date: 2010-04-14 Impact factor: 5.269
Authors: Chirag B Patel; David M Cohen; Pallavi Ahobila-Vajjula; Laura M Sundberg; Tessy Chacko; Ponnada A Narayana Journal: J Neurotrauma Date: 2009-07 Impact factor: 5.269
Authors: Marc Soubeyrand; Elisabeth Laemmel; Charles Court; Arnaud Dubory; Eric Vicaut; Jacques Duranteau Journal: Eur Spine J Date: 2013-03-19 Impact factor: 3.134