Key points. S. Perez-Protto 1, D. I. Sessler 2 *, L. F. Reynolds 3, M. H. Bakri 4, E. Mascha 2, J. Cywinski 1, B. Parker 1 and M.
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1 British Journal of Anaesthesia 105 (4): (2010) Advance Access publication 3 August doi: /bja/aeq170 Circulating-water garment or the combination of a circulating-water mattress and forced-air cover to maintain core temperature during major upper-abdominal surgery S. Perez-Protto 1, D. I. Sessler 2 *, L. F. Reynolds 3, M. H. Bakri 4, E. Mascha 2, J. Cywinski 1, B. Parker 1 and M. Argalious 1 1 Anaesthesiology Institute and 2 Department of Outcomes Research, The Cleveland Clinic, 9500 Euclid Avenue, P-77, Cleveland, OH 44195, USA 3 Dalhousie University, Nova Scotia, Canada 4 Assiut University Hospital, Egypt * Corresponding author. ds@or.org. World Wide Web: Key points Maintenance of temperature during major surgery can be a challenge. Circulating-water garments (CWGs) have been suggested to be effective. This study compared CWG with forced-air combined with a circulating-water mattress during upperabdominal surgery. Both methods were comparably effective in maintaining core temperatures. Background. A recent heat-balance study in volunteers suggested that greater efficacy of circulating-water garments (CWGs) results largely from increased heat transfer across the posterior skin surface since heat transfer across the anterior skin surface was similar with circulating-water and forced-air. We thus tested the hypothesis that the combination of a circulating-water mattress (CWM) and forced-air warming prevents core temperature reduction during major abdominal surgery no worse than a CWG does. Methods. Fifty adult patients aged between 18 and 85 yr old, undergoing major abdominal surgery, were randomly assigned to intraoperative warming with a combination of forcedair and a CWM or with a CWG (Allon ThermoWrap). Core temperature was measured in the distal oesophagus. Non-inferiority of the CWM to the CWG on change from baseline to median intraoperative temperature was assessed using a one-tailed Student s t-test with an equivalency buffer of 20.58C. Results. Data analysis was restricted to 16 CWG and 20 CWM patients who completed the protocol. Core temperature increased in both groups during the initial hours of surgery. We had sufficient evidence (P¼0.001), to conclude that the combination of a CWM and forcedair warming was non-inferior to a CWG in preventing temperature reduction, with mean (95% CI) difference in the temperature change between the CWM and the CWG groups (CWM2CWG) of 0.468C (20.098C, 1.008C). Conclusions. The combination of a CWM and forced-air warming is significantly non-inferior in maintaining intraoperative core temperature than a CWG. Trial registry: This trial has been registered at clinical trials.gov, identifier: NCT Keywords: anaesthesia; circulating-water; forced-air; heat; temperature; thermoregulation Accepted for publication: 25 May 2010 Intraoperative hypothermia (i.e. core temperature,368c) is common and results from inhibition of thermoregulatory control by general anaesthesia, 1 2 reduced metabolic heat production, 3 cold exposure, 4 evaporative heat loss from exposed viscera, 5 and redistribution of heat from the core to peripheral tissues. 6 Even mild perioperative hypothermia can cause a variety of adverse effects, including morbid myocardial events, 7 increased risk of surgical wound infections, 8 9 coagulopathy, 10 and prolonged post-anaesthetic recovery. 11 Full-body forced-air warming reduces cutaneous heat loss to nearly zero, 12 but even warming restricted to the upper or lower body reduces heat loss to roughly the metabolic rate 13 and thus maintains normothermia during most operations. However, the intraoperative use of forced-air may be insufficient to maintain perioperative normothermia during large intra-abdominal surgeries 14 such as orthotopic liver transplants. 15 Circulating-water systems that provide both anterior and posterior warming 16 are more effective in maintaining intraoperative normothermia during liver transplantation than forced-air warming In addition, a recent heatbalance study in volunteers suggested that the greater efficacy of circulating-water garments (CWGs) results largely from increased heat transfer across the posterior skin surface, since heat transfer across the anterior skin surface was similar with a CWG and forced-air cover. 17 We thus tested the hypothesis that the combination of a circulatingwater mattress (CWM) and upper body forced-air warming & The Author [2010]. Published by Oxford University Press on behalf of the British Journal of Anaesthesia. All rights reserved. For Permissions, please journals.permissions@oxfordjournal.org
2 Warming systems during major surgery BJA is not worse than a CWG in preventing temperature reduction during major upper abdominal surgery. Methods With approval from the Institutional Review board at the Cleveland Clinic and written informed consent, 50 adult patients aged between 18 and 85 yr old, undergoing major abdominal surgery were enrolled between November 2005 and June 2008; most were orthotopic liver transplants, liver resections, or Whipple procedures. Exclusion criteria included core temperature.388c; combined procedures (e.g. simultaneous liver and kidney transplantation); contraindication to forced-air or circulating-water warming (e.g. skin conditions such as rash, abscess, cuts, sores, etc.); anticipated veno-venous bypass for liver transplant; and current encephalopathy or pregnancy. Patients were randomly assigned to CWG (Allon Thermo- Wrap, MTRE Advanced Technologies, Or-Akiva Industrial Park, Israel) which was set to servo-control to a distal oesophageal temperature of 378C (n ¼ 25) or CWM (Gaymar Meditherm III, Orchard Park, NY, USA) set to 418C combined with upper body (model 522) and lower body (model 525) Bair- Hugger covers (Arizant Medical, Eden Prairie, MN, USA) connected to two Bair-Hugger warmers model 750 set on high ( 438C) (n ¼ 25). Randomization was based on computer-generated codes that were maintained in sequentially numbered opaque envelopes. Randomization envelopes were opened just before patients were transported to the operating theatre. Posterior skin surface warming began once the patients were transferred to the operating theatre table via the CWG or CWM depending on the group assignment. After induction of general anaesthesia, tracheal intubation and line insertion, anterior surface warming was started by covering the large parts of the lower extremities, the upper and lateral chest (above the nipple line) using either CWG or upper and lower body forced-air warmers. The warming with either method was discontinued when distal oesophageal (core) temperature was.37.58c, and was reinstituted when temperature was 37.08C or less. Anaesthesia was maintained with isoflurane in an air/ oxygen mixture with intermittent doses of fentanyl and pancuronium. The ambient temperature in the operating theatre was maintained constant at 218C. All i.v. administered fluids were warmed using the Belmont Instrument Fluid Management System (FMS 2000, Billerica, MA, USA). A distal oesophageal probe (Acoustascope, oesophageal stethoscope 18 Fr with temperature sensor-thermistor, Level 1, Rockland, MA, USA) was inserted after induction of general anaesthesia. Distal oesophageal temperature, mean arterial pressure (MAP) from a radial catheter, and heart rate (HR) were recorded at 15 min intervals throughout surgery, and were also available electronically at 1 min intervals from our anaesthesia record-keeping system (ARKS). Demographic and morphometric characteristics were recorded. Additionally, we recorded the total dose of fentanyl and propofol. Isoflurane expired concentration was recorded at 15 min intervals. Past medical history and length of surgery were collected. Total volume and type of infused fluids (crystalloids and colloids) and also estimated blood loss and urine output were collected. Statistical methods Twenty-five patients per group were planned in order to have 90% power at the overall significance level to reject the null hypothesis that the CWM temperature change is worse (lower) than CWG by at least 0.58C in a test of noninferiority. 18 Our null and alternative hypotheses were thus: Null (H0): mean CWM change2mean CWG change less than 20.58C, Alternative (H1): mean CWM change2mean CWG change greater than or equal to 20.58C. The primary outcome of temperature change was calculated as the median of intraoperative minute-by-minute temperatures minus the incision temperature (when oesophageal temperature monitoring started). Non-inferiority of the CWM to the CWG on temperature change was tested univariably at the level by onetailed Student s t-test using a non-inferiority delta of 20.58C and multivariably using analysis of covariance to adjust for imbalance on baseline variables. In addition, if non-inferiority was concluded, we planned to test for superiority at the level using one-tailed t-tests (given that direction would be known from the non-inferiority test). Comparisons between the CWM and the CWG groups in the MAP and HR were performed by two-tailed Student s t-tests. The significance level was for the primary outcome one-tailed tests, standard for non-inferiority designs, and 0.05 for non-primary outcome tests for superiority. SAS 9.2 software (SAS Institute, Cary, NC, USA) was used for all analyses. Results Data analysis was restricted to 36 patients (CWG: 16 and CWM: 20) who completed the protocol. Six of the enrolled patients in the CWG group and three enrolled patients in the CWM group did not have surgery because of problems related to the donor liver (Table 1). In three and two patients who were assigned to the CWG and the CWM, respectively, we were unable to complete the study because of technical difficulties identified in Table 1. Warming in three of the 20 patients in the CWM group was discontinued according to the study protocol when their distal oesophageal temperature exceeded 37.58C, one patient at 30 min after incision and the other two at about 3 h after incision. Their temperatures were nonetheless included in our analysis. The randomized CWM and CWG groups were fairly well balanced on baseline and intraoperative variables (Table 2). Mean core temperatures over time did not differ markedly between the treatment groups (Fig. 1). The mean difference (95% CI) in temperature change from incision to median 467
3 BJA Perez-Protto et al. Table 1 Missing data. CWG, circulating-water garment; CWM, combination of a circulating-water mattress and forced-air warming Patient no. intraoperative temperature between the CWM and the CWG groups [CWM mean (SD) increase of 1.1 (0.9) minus CWG increase of 0.63 (0.7)] was 0.468C (20.098C, 1.008C), where the lower limit of the 95% CI was greater than 20.58C, Table 1, leading to a conclusion of non-inferiority. We were not able to conclude superiority of CWM to CWG at the planned level because the confidence interval overlaps zero change, that is, the CMW mean change was not significantly higher than the CWG mean change (P¼0.0499). Multivariable assessment of non-inferiority and superiority adjusting for ASA status, EBL, and fentanyl, and variables on which the randomized groups appeared somewhat imbalanced had very similar results and reached the same conclusions. No significant difference was found in the median intraoperative MAP [mean (SD) of 78.2 (7.4) vs 79.0 (9.9), P¼0.76] or HR [85.9 (7.3) vs 86.3 (16.8), P¼0.94] between the CWM and CWG groups, respectively. Discussion Missing reason Randomized group: CWG 5 No oesophageal temperature was recorded 10 Did not have the transplant surgery due to recipientor donor-related medical complications 14 Did not have the transplant surgery due to donor cause (liver not acceptable) 16 Patient was enrolled, but case not done. CWG leak 20 Changed to venous venous bypass after randomization 24 Patient was enrolled, but case not done. Machine problem (excessive noise) 26 Changed to laparoscopic surgery 36 Surgery cancelled 39 CWG malfunction during surgical preparation Randomized group: CWM 3 Did not have the transplant surgery due to donor cause (liver not acceptable) 8 Did not have the transplant surgery due to difficulties with harvested liver 13 Changed to venous venous bypass 21 Surgery cancelled and mattress leak 43 Surgery cancelled and failure of the mattress controller This study was based on a previous volunteer study which showed that the CWG transfers more heat than forced-air alone, but that the difference is largely explained by the fact that the CWG included posterior heating. 17 This observation suggested that the combination of forced-air and a CWM would provide comparable benefit. Our results support this theory: there was no clinically important Table 2 Baseline characteristics and anaesthetic management. Data are mean (SD), median (IQR), or numbers (%). CWG, circulating-water garment; CWM, combination of a circulating-water mattress and forced-air warming Variables CWG (n516) CWM (n520) Statistics Statistics Baseline Age (yr) 60 (15) 58 (8) Body mass index 28 (6) 29 (5) (kg m 22 ) Female 4 (25%) 7 (35%) Race Caucasian 14 (88%) 16 (80%) African-American 2 (12%) 3 (15%) Hispanic/Latino 0 1 (5%) ASA status II 4 (25%) 3 (15%) III 6 (38%) 11 (55%) IV 6 (38%) 6 (30%) Surgery type Liver transplant 5 (31%) 8 (40%) Liver resection 7 (44%) 7 (35%) Whipple 3 (19) 1 (5) Others 1 (6%) 4 (20%) Intraoperative Blood loss (ml) 600 (288, 2625) 1500 (525, 3500) Urine (ml) 338 (276, 688) 512 (288, 911) Crystalloid (ml) 4950 (3300, 6000) 4250 (3650, 5725) Colloid (ml) 2000 (1000, 2000) 2000 (1000, 2375) Fentanyl (mg) 375 (250, 675) 508 (250, 888) Propofol (mg) 165 (44) 171 (59) End-tidal (isoflurane) 0.8 (0.7, 0.9) 0.8 (0.7, 0.9) Duration of surgery (h) 7 (3) 7 (3) difference between the systems we tested, and the observed mean increase in core temperature was found to be significantly non-inferior with the combination of forced-air and a CWM than with the CWG. We thus conclude that the combination of forced-air and a CWM maintains core temperature during major abdominal surgery and the CWG. Core temperatures increased throughout most of surgery even though we enrolled only patients having major upper abdominal surgeries. In fact, we needed to discontinue combination warming in three of 20 CWM patients (15%) because their distal oesophageal temperatures exceeded 37.58C. It thus seems likely that forced-air alone would have been sufficient in most patients. An important point, though, is that we used two forced-air covers, one for the lower body and another for the upper body. This is not the way the systems are normally used, but has the advantage of doubling heat transfer. 13 We only tested one forced-air system (from Arizant Medical). However, the efficacy of various forced-air systems is comparable. 19 It is thus likely that our results apply to other forced-air systems. In contrast, newer 468
4 Warming systems during major surgery BJA 38 Conflict of interest None declared. Core temp. (ºC) CWM Funding Supported by internal funds. The forced-air covers and circulating-water garments used in this study were purchased from the respective companies CWG n= n= circulating-water systems differ considerably in their efficacy. For example, energy transfer pads from Kimberly Clark (Roswell, GA, USA) are about 25% more effective than CWG system we tested (Allon ThermoWrap, MTRE Advanced Technologies, Or-Akiva Industrial Park). 16 And other commercially available systems have yet to be formally tested. At any given water temperature, the primary factors influencing the efficacy of circulating-water systems are the thickness of the plastic separating the water from the skin, how well the water garment contacts the skin, and how well perfused the warmed skin is. Design thus plays a larger role with circulating-water systems than with forced-air convective systems where the air has relatively free access to most skin under the covers. A limitation of our study is the five CWM and nine CWG patients (28% of 50) who were randomized but whose data were not available for analysis, either due to technical problems with the warming device or due to major changes in the patient surgical plans (Table 1). The resulting smaller-than-planned sample size could have reduced the power of our study, but this proved not to be the case since the primary outcome was statistically significant. In summary, average core temperature change was not worse with the combination of a CWM and forced-air warming compared with a CWG during major abdominal surgery. Acknowledgement End Time (h) Fig 1 Core temperatures from incision to the end of surgery in patients assigned to the combination of a CWM and forced-air warming or to a CWG. The number of patients included at each time point (n) is also shown; the number of patients decreased over time because some operations lasted longer than others (one temperature was missing at 30 min for technical reasons). Mean core temperatures with the CWM were significantly noninferior to mean core temperatures with the CWG (multivariable P,0.001). We appreciate the statistical assistance of Jing You, MS. References 1 Annadata RS, Sessler DI, Tayefeh F, Kurz A, Dechert M. Desflurane slightly increases the sweating threshold, but produces marked, non-linear decreases in the vasoconstriction and shivering thresholds. Anesthesiology 1995; 83: Matsukawa T, Kurz A, Sessler DI, Bjorksten AR, Merrifield B, Cheng C. Propofol linearly reduces the vasoconstriction and shivering thresholds. Anesthesiology 1995; 82: Sessler DI, McGuire J, Moayeri A, Hynson J. Isoflurane-induced vasodilation minimally increases cutaneous heat loss. Anesthesiology 1991; 74: Frank SM, Shir Y, Raja SN, Fleisher LA, Beattie C. Core hypothermia and skin-surface temperature gradients: epidural vs. general anaesthesia and the effects of age. Anesthesiology 1994; 80: Roe CF. Effect of bowel exposure on body temperature during surgical operations. Am J Surg 1971; 122: Matsukawa T, Sessler DI, Sessler AM, et al. Heat flow and distribution during induction of general anaesthesia. Anesthesiology 1995; 82: Frank SM, Fleisher LA, Breslow MJ, et al. Perioperative maintenance of normothermia reduces the incidence of morbid cardiac events: a randomized clinical trial. J Am Med Assoc 1997; 277: Kurz A, Sessler DI, Lenhardt RA, Study of Wound Infections, Temperature Group. Perioperative normothermia to reduce the incidence of surgical-wound infection and shorten hospitalization. N Engl J Med 1996; 334: Melling AC, Ali B, Scott EM, Leaper DJ. Effects of preoperative warming on the incidence of wound infection after clean surgery: a randomised controlled trial. Lancet 2001; 358: Rajagopalan S, Mascha E, Na J, Sessler DI. The effects of mild perioperative hypothermia on blood loss and transfusion requirement: a meta-analysis. Anesthesiology 2008; 108: Lenhardt R, Marker E, Goll V, et al. Mild intraoperative hypothermia prolongs postanesthetic recovery. Anesthesiology 1997; 87: Sessler DI, Moayeri A. Skin-surface warming: heat flux and central temperature. Anesthesiology 1990; 73: Giesbrecht GG, Ducharme MB, McGuire JP. Comparison of forced-air patient warming systems for perioperative use. Anesthesiology 1994; 80: Janicki PK, Higgins MS, Janssen J, Johnson RF, Beattie C. Comparison of two different temperature maintenance strategies during open abdominal surgery: upper body forced-air warming versus whole body water garment. Anesthesiology 2001; 95: Janicki PK, Stoica C, Chapman WC, et al. Water warming garment versus forced air warming system in prevention of intraoperative hypothermia during liver transplantation: a randomized controlled trial. BMC Anesthesiol 2002; 2: 7 469
5 BJA Perez-Protto et al. 16 Wadhwa A, Komatsu R, Orhan-Sungur M, et al. New circulatingwater devices warm more quickly than forced-air in volunteers. Anesth Analg 2007; 105: Taguchi A, Ratnaraj J, Kabon B, et al. Effects of a circulating-water garment and forced-air warming on body heat content and core temperature. Anesthesiology 2004; 100: Tunes da Silva G, Logan BR, Klein JP. Methods for equivalence and noninferiority testing. Biol Blood Marrow Transplant 2009; 15: Perl T, Brauer A, Timmermann A, Mielck F, Weyland W, Braun U. Differences among forced-air warming systems with upper body blankets are small. A randomized trial for heat transfer in volunteers. Acta Anaesthesiol Scand 2003; 47:
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