Cerebral blood flow autoregulation is preserved after hypothermic circulatory arrest

Masahiro Ono, Charles Brown, Jennifer Lee-Summers, Rebecca F Gottesman, Michael A Kraut, James Hamilton Black, Ashish Shah, Duke E. Cameron, William A Baumgartner, Charles W. Hogue

Research output: Contribution to journalArticle

Abstract

Background Patients undergoing aortic operations with hypothermic circulatory arrest (HCA) may require prolonged rewarming, a maneuver associated with impaired cerebral blood flow (CBF) autoregulation. The purpose of this study was to determine the effects of HCA on CBF autoregulation with a validated method based on near-infrared spectroscopy. Methods Regional cerebral oxygen saturation (rSco2) was monitored in 25 patients undergoing aortic reconstructive operations. HCA was used in 13 patients. Autoregulation was measured continuously during the operation by calculating the linear correlation coefficient between low-frequency changes in rSco2 and mean arterial pressure (MAP), generating the variable cerebral oximetry index (COx). When CBF autoregulation is functional, COx is near 0, because CBF and MAP are not correlated, but approaches 1 when autoregulation is impaired (ie, CBF is pressure passive). On the basis of prior studies, impaired autoregulation was defined as COx exceeding 0.3. Results COx did not differ between HCA and non-HCA groups before cardiopulmonary bypass or during the cooling phase of the operation, although the lower limit of autoregulation tended to be lower in patients before HCA (p = 0.053). During patient rewarming, COx was lower in the HCA group (p = 0.045), and abnormal COx was less frequent (31% vs 75%, p = 0.047) compared with the non-HCA group. Conclusions During aortic reconstructive operations, CBF autoregulation is preserved during the cooling phase of the procedure in patients undergoing HCA. Perfusion maneuvers associated with HCA may be protective against impaired autoregulation during rewarming compared with the non-HCA group.

Original languageEnglish (US)
Pages (from-to)2045-2053
Number of pages9
JournalAnnals of Thoracic Surgery
Volume96
Issue number6
DOIs
StatePublished - Dec 2013

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Cerebrovascular Circulation
Homeostasis
Oximetry
Rewarming
Arterial Pressure
Near-Infrared Spectroscopy
Cardiopulmonary Bypass
Perfusion

ASJC Scopus subject areas

  • Cardiology and Cardiovascular Medicine
  • Surgery
  • Pulmonary and Respiratory Medicine
  • Medicine(all)

Cite this

Cerebral blood flow autoregulation is preserved after hypothermic circulatory arrest. / Ono, Masahiro; Brown, Charles; Lee-Summers, Jennifer; Gottesman, Rebecca F; Kraut, Michael A; Black, James Hamilton; Shah, Ashish; Cameron, Duke E.; Baumgartner, William A; Hogue, Charles W.

In: Annals of Thoracic Surgery, Vol. 96, No. 6, 12.2013, p. 2045-2053.

Research output: Contribution to journalArticle

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abstract = "Background Patients undergoing aortic operations with hypothermic circulatory arrest (HCA) may require prolonged rewarming, a maneuver associated with impaired cerebral blood flow (CBF) autoregulation. The purpose of this study was to determine the effects of HCA on CBF autoregulation with a validated method based on near-infrared spectroscopy. Methods Regional cerebral oxygen saturation (rSco2) was monitored in 25 patients undergoing aortic reconstructive operations. HCA was used in 13 patients. Autoregulation was measured continuously during the operation by calculating the linear correlation coefficient between low-frequency changes in rSco2 and mean arterial pressure (MAP), generating the variable cerebral oximetry index (COx). When CBF autoregulation is functional, COx is near 0, because CBF and MAP are not correlated, but approaches 1 when autoregulation is impaired (ie, CBF is pressure passive). On the basis of prior studies, impaired autoregulation was defined as COx exceeding 0.3. Results COx did not differ between HCA and non-HCA groups before cardiopulmonary bypass or during the cooling phase of the operation, although the lower limit of autoregulation tended to be lower in patients before HCA (p = 0.053). During patient rewarming, COx was lower in the HCA group (p = 0.045), and abnormal COx was less frequent (31{\%} vs 75{\%}, p = 0.047) compared with the non-HCA group. Conclusions During aortic reconstructive operations, CBF autoregulation is preserved during the cooling phase of the procedure in patients undergoing HCA. Perfusion maneuvers associated with HCA may be protective against impaired autoregulation during rewarming compared with the non-HCA group.",
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AU - Ono, Masahiro

AU - Brown, Charles

AU - Lee-Summers, Jennifer

AU - Gottesman, Rebecca F

AU - Kraut, Michael A

AU - Black, James Hamilton

AU - Shah, Ashish

AU - Cameron, Duke E.

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AU - Hogue, Charles W.

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N2 - Background Patients undergoing aortic operations with hypothermic circulatory arrest (HCA) may require prolonged rewarming, a maneuver associated with impaired cerebral blood flow (CBF) autoregulation. The purpose of this study was to determine the effects of HCA on CBF autoregulation with a validated method based on near-infrared spectroscopy. Methods Regional cerebral oxygen saturation (rSco2) was monitored in 25 patients undergoing aortic reconstructive operations. HCA was used in 13 patients. Autoregulation was measured continuously during the operation by calculating the linear correlation coefficient between low-frequency changes in rSco2 and mean arterial pressure (MAP), generating the variable cerebral oximetry index (COx). When CBF autoregulation is functional, COx is near 0, because CBF and MAP are not correlated, but approaches 1 when autoregulation is impaired (ie, CBF is pressure passive). On the basis of prior studies, impaired autoregulation was defined as COx exceeding 0.3. Results COx did not differ between HCA and non-HCA groups before cardiopulmonary bypass or during the cooling phase of the operation, although the lower limit of autoregulation tended to be lower in patients before HCA (p = 0.053). During patient rewarming, COx was lower in the HCA group (p = 0.045), and abnormal COx was less frequent (31% vs 75%, p = 0.047) compared with the non-HCA group. Conclusions During aortic reconstructive operations, CBF autoregulation is preserved during the cooling phase of the procedure in patients undergoing HCA. Perfusion maneuvers associated with HCA may be protective against impaired autoregulation during rewarming compared with the non-HCA group.

AB - Background Patients undergoing aortic operations with hypothermic circulatory arrest (HCA) may require prolonged rewarming, a maneuver associated with impaired cerebral blood flow (CBF) autoregulation. The purpose of this study was to determine the effects of HCA on CBF autoregulation with a validated method based on near-infrared spectroscopy. Methods Regional cerebral oxygen saturation (rSco2) was monitored in 25 patients undergoing aortic reconstructive operations. HCA was used in 13 patients. Autoregulation was measured continuously during the operation by calculating the linear correlation coefficient between low-frequency changes in rSco2 and mean arterial pressure (MAP), generating the variable cerebral oximetry index (COx). When CBF autoregulation is functional, COx is near 0, because CBF and MAP are not correlated, but approaches 1 when autoregulation is impaired (ie, CBF is pressure passive). On the basis of prior studies, impaired autoregulation was defined as COx exceeding 0.3. Results COx did not differ between HCA and non-HCA groups before cardiopulmonary bypass or during the cooling phase of the operation, although the lower limit of autoregulation tended to be lower in patients before HCA (p = 0.053). During patient rewarming, COx was lower in the HCA group (p = 0.045), and abnormal COx was less frequent (31% vs 75%, p = 0.047) compared with the non-HCA group. Conclusions During aortic reconstructive operations, CBF autoregulation is preserved during the cooling phase of the procedure in patients undergoing HCA. Perfusion maneuvers associated with HCA may be protective against impaired autoregulation during rewarming compared with the non-HCA group.

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