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Duh M, Skok K, Perc M, Markota A, Gosak M. Computational modeling of targeted temperature management in post-cardiac arrest patients. Biomech Model Mechanobiol 2022; 21:1407-1424. [PMID: 35763192 DOI: 10.1007/s10237-022-01598-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2022] [Accepted: 05/23/2022] [Indexed: 11/28/2022]
Abstract
Our core body temperature is held around [Formula: see text]C by an effective internal thermoregulatory system. However, various clinical scenarios have a more favorable outcome under external temperature regulation. Therapeutic hypothermia, for example, was found beneficial for the outcome of resuscitated cardiac arrest patients due to its protection against cerebral ischemia. Nonetheless, practice shows that outcomes of targeted temperature management vary considerably in dependence on individual tissue damage levels and differences in therapeutic strategies and protocols. Here, we address these differences in detail by means of computational modeling. We develop a multi-segment and multi-node thermoregulatory model that takes into account details related to specific post-cardiac arrest-related conditions, such as thermal imbalances due to sedation and anesthesia, increased metabolic rates induced by inflammatory processes, and various external cooling techniques. In our simulations, we track the evolution of the body temperature in patients subjected to post-resuscitation care, with particular emphasis on temperature regulation via an esophageal heat transfer device, on the examination of the alternative gastric cooling with ice slurry, and on how anesthesia and the level of inflammatory response influence thermal behavior. Our research provides a better understanding of the heat transfer processes and therapies used in post-cardiac arrest patients.
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Affiliation(s)
- Maja Duh
- Faculty of Natural Sciences and Mathematics, University of Maribor, Koroška cesta 160, 2000, Maribor, Slovenia
| | - Kristijan Skok
- Faculty of Medicine, University of Maribor, Taborska ulica 8, 2000, Maribor, Slovenia.,Department of Pathology, General Hospital Graz II, Location West, Göstinger Straße 22, 8020, Graz, Austria
| | - Matjaž Perc
- Faculty of Natural Sciences and Mathematics, University of Maribor, Koroška cesta 160, 2000, Maribor, Slovenia.,Department of Medical Research, China Medical University Hospital, China Medical University, Taichung, 404332, Taiwan.,Alma Mater Europaea, Slovenska ulica 17, 2000, Maribor, Slovenia.,Complexity Science Hub Vienna, Josefstädterstraße 39, 1080, Vienna, Austria
| | - Andrej Markota
- Faculty of Medicine, University of Maribor, Taborska ulica 8, 2000, Maribor, Slovenia.,Medical Intensive Care Unit, University Medical Centre Maribor, Ljubljanska 5, 2000, Maribor, Slovenia
| | - Marko Gosak
- Faculty of Natural Sciences and Mathematics, University of Maribor, Koroška cesta 160, 2000, Maribor, Slovenia. .,Faculty of Medicine, University of Maribor, Taborska ulica 8, 2000, Maribor, Slovenia.
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Skok K, Duh M, Stožer A, Markota A, Gosak M. Thermoregulation: A journey from physiology to computational models and the intensive care unit. WILEY INTERDISCIPLINARY REVIEWS. SYSTEMS BIOLOGY AND MEDICINE 2020; 13:e1513. [PMID: 33251759 DOI: 10.1002/wsbm.1513] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/21/2020] [Revised: 10/24/2020] [Accepted: 11/02/2020] [Indexed: 12/19/2022]
Abstract
Thermoregulation plays a vital role in homeostasis. Many species of animals as well as humans have evolved various physiological mechanisms for body temperature control, which are characteristically flexible and enable a fine-tuned spatial and temporal regulation of body temperature in different environmental conditions and circumstances. Human beings normally maintain a core body temperature at around 37°C, and maintenance of this relatively high temperature is critical for survival. Therefore, principles of thermoregulatory control have also important clinical implications. Infections can cause the body temperature to rise internally and several diseases can cause a dysfunction of thermoregulatory mechanisms. Moreover, the utilization of thermotherapies in treating various diseases has been known for thousands of years with a recent resurgence of interest. An increasing amount of research suggests that targeted temperature management is of paramount importance to patient outcomes in certain clinical scenarios. We provide a concise summary of the basic concepts of thermoregulation. Emphasis is given to the principles of thermoregulation in humans in basic pathological states and to targeted temperature management strategies in the clinical environment, with special attention on therapeutic hypothermia in postcardiac arrest patients. Finally, the discussion is focused on the potential offered by computational thermophysiological models for predicting thermal responses of patients in various clinical circumstances, for proposing new perspectives in the design of novel thermal therapies, and to optimize targeted temperature management strategies. This article is categorized under: Cardiovascular Diseases > Cardiovascular Diseases>Computational Models Cardiovascular Diseases > Cardiovascular Diseases>Environmental Factors Cardiovascular Diseases > Cardiovascular Diseases>Biomedical Engineering.
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Affiliation(s)
- Kristijan Skok
- Department of Pathology, General Hospital Graz II, Location West, Graz, Austria
- Faculty of Medicine, University of Maribor, Maribor, Slovenia
| | - Maja Duh
- Faculty of Natural Sciences and Mathematics, University of Maribor, Koros̆ka cesta, Maribor, Slovenia
| | - Andraž Stožer
- Faculty of Medicine, University of Maribor, Maribor, Slovenia
| | - Andrej Markota
- Faculty of Medicine, University of Maribor, Maribor, Slovenia
- Medical Intensive Care Unit, University Medical Centre Maribor, Maribor, Slovenia
| | - Marko Gosak
- Faculty of Medicine, University of Maribor, Maribor, Slovenia
- Faculty of Natural Sciences and Mathematics, University of Maribor, Koros̆ka cesta, Maribor, Slovenia
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3
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Schroeder DC, Maul AC, Guschlbauer M, Finke SR, de la Puente Bethencourt D, Becker I, Padosch SA, Hohn A, Annecke T, Böttiger BW, Sterner-Kock A, Herff H. Intravascular Cooling Device Versus Esophageal Heat Exchanger for Mild Therapeutic Hypothermia in an Experimental Setting. Anesth Analg 2020; 129:1224-1231. [PMID: 30418241 DOI: 10.1213/ane.0000000000003922] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
BACKGROUND Targeted temperature management is a standard therapy for unconscious survivors of cardiac arrest. To date, multiple cooling methods are available including invasive intravascular cooling devices (IVDs), which are widely used in the clinical setting. Recently, esophageal heat exchangers (EHEs) have been developed providing cooling via the esophagus that is located close to the aorta and inferior vena cava. The objective was to compare mean cooling rates, as well as differences, to target temperature during maintenance and the rewarming period of IVD and EHE. METHODS The study was conducted in 16 female domestic pigs. After randomization to either IVD or EHE (n = 8/group), core body temperature was reduced to 33°C. After 24 hours of maintenance (33°C), animals were rewarmed using a target rate of 0.25°C/h for 10 hours. All cooling phases were steered by a closed-loop feedback system between the internal jugular vein and the chiller. After euthanasia, laryngeal and esophageal tissue was harvested for histopathological examination. RESULTS Mean cooling rates (4.0°C/h ± 0.4°C/h for IVD and 2.4°C/h ± 0.3°C/h for EHE; P < .0008) and time to target temperature (85.1 ± 9.2 minutes for IVD and 142.0 ± 21.2 minutes for EHE; P = .0008) were different. Mean difference to target temperature during maintenance (0.07°C ± 0.05°C for IVD and 0.08°C ± 0.10°C for EHE; P = .496) and mean rewarming rates (0.2°C/h ± 0.1°C/h for IVD and 0.3°C/h ± 0.2°C/h for EHE; P = .226) were similar. Relevant laryngeal or esophageal tissue damage could not be detected. There were no significant differences in undesired side effects (eg, bradycardia or tachycardia, hypokalemia or hyperkalemia, hypoglycemia or hyperglycemia, hypotension, overcooling, or shivering). CONCLUSIONS After insertion, target temperatures could be reached faster by IVD compared to EHE. Cooling performance of IVD and EHE did not significantly differ in maintaining target temperature during a targeted temperature management process and in active rewarming protocols according to intensive care unit guidelines in this experimental setting.
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Affiliation(s)
- Daniel C Schroeder
- From the Department of Anesthesiology and Intensive Care Medicine, University Hospital of Cologne, Cologne, Germany
| | - Alexandra C Maul
- Center for Experimental Medicine, University Hospital of Cologne, Cologne, Germany
| | - Maria Guschlbauer
- Center for Experimental Medicine, University Hospital of Cologne, Cologne, Germany.,Decentral Animal Facility, University Hospital of Cologne, Cologne, Germany
| | - Simon-Richard Finke
- From the Department of Anesthesiology and Intensive Care Medicine, University Hospital of Cologne, Cologne, Germany
| | | | - Ingrid Becker
- Institute of Medical Statistics and Computational Biology, University Hospital of Cologne, Cologne, Germany
| | - Stephan A Padosch
- From the Department of Anesthesiology and Intensive Care Medicine, University Hospital of Cologne, Cologne, Germany
| | - Andreas Hohn
- From the Department of Anesthesiology and Intensive Care Medicine, University Hospital of Cologne, Cologne, Germany
| | - Thorsten Annecke
- From the Department of Anesthesiology and Intensive Care Medicine, University Hospital of Cologne, Cologne, Germany
| | - Bernd W Böttiger
- From the Department of Anesthesiology and Intensive Care Medicine, University Hospital of Cologne, Cologne, Germany
| | - Anja Sterner-Kock
- Center for Experimental Medicine, University Hospital of Cologne, Cologne, Germany
| | - Holger Herff
- From the Department of Anesthesiology and Intensive Care Medicine, University Hospital of Cologne, Cologne, Germany
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4
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Xu J, Jin X, Chen Q, Wu C, Li Z, Zhou G, Xu Y, Qian A, Li Y, Zhang M. Faster Hypothermia Induced by Esophageal Cooling Improves Early Markers of Cardiac and Neurological Injury After Cardiac Arrest in Swine. J Am Heart Assoc 2019; 7:e010283. [PMID: 30608213 PMCID: PMC6404192 DOI: 10.1161/jaha.118.010283] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Background After cardiopulmonary resuscitation, the protective effects of therapeutic hypothermia induced by conventional cooling are limited. Recently, esophageal cooling (EC) has been shown to be an effective, easily performed approach to induce therapeutic hypothermia. In this study we investigated the efficacy of EC and its effects on early markers of postresuscitation cardiac and neurological injury in a porcine model of cardiac arrest. Methods and Results Thirty‐two male domestic swine were randomized into 4 groups: sham control, normothermia, surface cooling, and EC. Sham animals underwent the surgical preparation only. Ventricular fibrillation was induced and untreated for 8 minutes while defibrillation was attempted after 5 minutes of cardiopulmonary resuscitation. At 5 minutes after resuscitation, therapeutic hypothermia was induced by either EC or surface cooling to reach a target temperature of 33°C until 24 hours postresuscitation, followed by a rewarming rate of 1°C/h for 5 hours. The temperature was normally maintained in the control and normothermia groups. After resuscitation, a significantly faster decrease in blood temperature was observed in the EC group than in the surface cooling group (2.8±0.7°C/h versus 1.5±0.4°C/h; P<0.05). During the maintenance and rewarming phases the temperature was maintained at an even level between the 2 groups. Postresuscitation cardiac and neurological damage was significantly improved in the 2 hypothermic groups compared with the normothermia group; however, the protective effects were significantly greater in the EC group. Conclusions In a porcine model of cardiac arrest, faster hypothermia successfully induced by EC was significantly better than conventional cooling in improving early markers of postresuscitation cardiac and neurological injury.
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Affiliation(s)
- Jiefeng Xu
- 1 Department of Emergency Medicine Second Affiliated Hospital Zhejiang University School of Medicine Hangzhou China.,2 Institute of Emergency Medicine Zhejiang University Hangzhou China.,3 Department of Emergency Medicine Yuyao People's Hospital Medical School of Ningbo University Ningbo China
| | - Xiaohong Jin
- 1 Department of Emergency Medicine Second Affiliated Hospital Zhejiang University School of Medicine Hangzhou China.,2 Institute of Emergency Medicine Zhejiang University Hangzhou China.,4 Department of Emergency Medicine The First People's Hospital of Wenling Taizhou China
| | - Qijiang Chen
- 1 Department of Emergency Medicine Second Affiliated Hospital Zhejiang University School of Medicine Hangzhou China.,2 Institute of Emergency Medicine Zhejiang University Hangzhou China.,5 Department of Intensive Care Medicine The First Hospital of Ninghai Ningbo China
| | - Chunshuang Wu
- 1 Department of Emergency Medicine Second Affiliated Hospital Zhejiang University School of Medicine Hangzhou China.,2 Institute of Emergency Medicine Zhejiang University Hangzhou China
| | - Zilong Li
- 3 Department of Emergency Medicine Yuyao People's Hospital Medical School of Ningbo University Ningbo China
| | - Guangju Zhou
- 1 Department of Emergency Medicine Second Affiliated Hospital Zhejiang University School of Medicine Hangzhou China.,2 Institute of Emergency Medicine Zhejiang University Hangzhou China
| | - Yongan Xu
- 1 Department of Emergency Medicine Second Affiliated Hospital Zhejiang University School of Medicine Hangzhou China.,2 Institute of Emergency Medicine Zhejiang University Hangzhou China
| | - Anyu Qian
- 1 Department of Emergency Medicine Second Affiliated Hospital Zhejiang University School of Medicine Hangzhou China.,2 Institute of Emergency Medicine Zhejiang University Hangzhou China
| | - Yulin Li
- 1 Department of Emergency Medicine Second Affiliated Hospital Zhejiang University School of Medicine Hangzhou China.,2 Institute of Emergency Medicine Zhejiang University Hangzhou China
| | - Mao Zhang
- 1 Department of Emergency Medicine Second Affiliated Hospital Zhejiang University School of Medicine Hangzhou China.,2 Institute of Emergency Medicine Zhejiang University Hangzhou China
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5
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Goury A, Poirson F, Chaput U, Voicu S, Garçon P, Beeken T, Malissin I, Kerdjana L, Chelly J, Vodovar D, Oueslati H, Ekherian JM, Marteau P, Vicaut E, Megarbane B, Deye N. Targeted temperature management using the "Esophageal Cooling Device" after cardiac arrest (the COOL study): A feasibility and safety study. Resuscitation 2017; 121:54-61. [PMID: 28951293 DOI: 10.1016/j.resuscitation.2017.09.021] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2017] [Revised: 09/18/2017] [Accepted: 09/22/2017] [Indexed: 11/28/2022]
Abstract
BACKGROUND Targeted temperature management (TTM) between 32 and 36°C is recommended after out-of-hospital cardiac arrest (OHCA). We aimed to assess the feasibility and safety of the "Esophageal Cooling Device" (ECD) in performing TTM. PATIENTS AND METHODS This single-centre, prospective, interventional study included 17 comatose OHCA patients. Main exclusion criteria were: delay between OHCA and return of spontaneous circulation (ROSC)>60min, delay between sustained ROSC and inclusion >360min, known oesophageal disease. A TTM between 32 and 34°C was performed using the ECD (Advanced Cooling Therapy, USA) connected to a heat exchanger console (Meditherm III®, Gaymar, France), without cold fluids' use. Primary endpoint was feasibility of inducing, maintaining TTM, and rewarming using the ECD alone. Secondary endpoints were adverse events, focusing on potential digestive damages. Results were expressed as median (interquartiles 25-75). RESULTS Cooling rate to reach the Target Temperature (33°C-TT) was 0.26°C/h [0.19-0.36]. All patients reached the 32-34°C range with a time spent within the range of 26h [21-28] (3 patients did not reach 33°C). Temperature deviation outside the TT during TTM-maintenance was 0.10°C [0.03-0.20]. Time with deviation >1°C was 0h. Rewarming rate was 0.20°C/h [0.18-0.22]. Among the 16 gastrointestinal endoscopy procedures performed, 10 (62.5%) were normal. Minor oeso-gastric injuries (37.5% and 19%, respectively) were similar to usual orogastric tube injuries. One patient experienced severe oesophagitis mimicking peptic lesions, not cooling-related. No patient among the 9 alive at 3-month follow-up had gastrointestinal complains. CONCLUSION ECD seems an interesting, safe, accurate, semi-invasive cooling method in OHCA patients treated with 33°C-TTM, particularly during the maintenance phase.
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Affiliation(s)
- Antoine Goury
- Réanimation Médicale & Toxicologique, Hôpital Lariboisière, AP-HP, Paris Cedex 10, France
| | - Florent Poirson
- Réanimation Médicale & Toxicologique, Hôpital Lariboisière, AP-HP, Paris Cedex 10, France
| | - Ulriikka Chaput
- Hépato-gastro-entérologie, Hôpital Saint-Antoine, AP-HP, Paris, France
| | - Sebastian Voicu
- Réanimation Médicale & Toxicologique, Hôpital Lariboisière, AP-HP, Paris Cedex 10, France
| | - Pierre Garçon
- Réanimation Médicale & Toxicologique, Hôpital Lariboisière, AP-HP, Paris Cedex 10, France
| | - Thomas Beeken
- Réanimation Médicale & Toxicologique, Hôpital Lariboisière, AP-HP, Paris Cedex 10, France
| | - Isabelle Malissin
- Réanimation Médicale & Toxicologique, Hôpital Lariboisière, AP-HP, Paris Cedex 10, France
| | - Lamia Kerdjana
- Réanimation Médicale & Toxicologique, Hôpital Lariboisière, AP-HP, Paris Cedex 10, France
| | - Jonathan Chelly
- Réanimation Médicale & Toxicologique, Hôpital Lariboisière, AP-HP, Paris Cedex 10, France; Clinical Research Unit-Groupe Hospitalier Sud Île de France, 77000 Melun, France
| | - Dominique Vodovar
- Réanimation Médicale & Toxicologique, Hôpital Lariboisière, AP-HP, Paris Cedex 10, France
| | - Haikel Oueslati
- Réanimation Médicale & Toxicologique, Hôpital Lariboisière, AP-HP, Paris Cedex 10, France
| | - Jean Michel Ekherian
- Réanimation Médicale & Toxicologique, Hôpital Lariboisière, AP-HP, Paris Cedex 10, France
| | - Philippe Marteau
- Hépato-gastro-entérologie, Hôpital Saint-Antoine, AP-HP, Paris, France
| | - Eric Vicaut
- Unité de Recherche Clinique, Hôpital Fernand Widal, AP-HP, Paris Cedex 10, France
| | - Bruno Megarbane
- Réanimation Médicale & Toxicologique, Hôpital Lariboisière, AP-HP, Paris Cedex 10, France; INSERM UMRS-1144, Paris, France
| | - Nicolas Deye
- Réanimation Médicale & Toxicologique, Hôpital Lariboisière, AP-HP, Paris Cedex 10, France; INSERM U942, Hôpital Lariboisière, Paris, France.
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Hegazy AF, Lapierre DM, Butler R, Martin J, Althenayan E. The esophageal cooling device: A new temperature control tool in the intensivist's arsenal. Heart Lung 2017; 46:143-148. [PMID: 28410771 DOI: 10.1016/j.hrtlng.2017.03.001] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2016] [Revised: 03/04/2017] [Accepted: 03/06/2017] [Indexed: 11/16/2022]
Abstract
BACKGROUND Therapeutic hypothermia has been demonstrated to improve neurological outcome in comatose survivors of cardiac arrest. Current temperature control modalities however, have several limitations. Exploring innovative methods of temperature management has become a necessity. METHODS We describe the first use of a novel esophageal cooling device as a sole modality for hypothermia induction, maintenance and rewarming in a series of four postcardiac arrest patients. The device was inserted in a manner similar to standard orogastric tubes and connected to an external heat exchange unit. RESULTS A mean cooling rate of 0.42 °C/hr (SD ± 0.26) was observed. An average of 4 hr 24 min (SD ± 2 hr 6 min) was required to reach target temperature, and this was maintained 90.25% (SD ± 16.20%) of the hypothermia protocol duration. No adverse events related to device use were encountered. Questionnaires administered to ICU nursing staff regarding ease-of-use of the device and its performance were rated as favorable. CONCLUSIONS When used as a sole modality, objective performance parameters of the esophageal-cooling device were found to be comparable to standard temperature control methods. More research is required to further quantify efficacy, safety, assess utility in other patient populations, and examine patient outcomes with device use in comparison to standard temperature control modalities.
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Affiliation(s)
- Ahmed F Hegazy
- Department of Anesthesia and Perioperative Medicine, University of Western Ontario, LHSC-UC, 339 Windermere Road, London, Ontario N6A 5A5, Canada.
| | - Danielle M Lapierre
- Department of Anesthesia and Perioperative Medicine, University of Western Ontario, LHSC-UC, 339 Windermere Road, London, Ontario N6A 5A5, Canada
| | - Ron Butler
- Department of Anesthesia and Perioperative Medicine, University of Western Ontario, LHSC-UC, 339 Windermere Road, London, Ontario N6A 5A5, Canada
| | - Janet Martin
- Department of Epidemiology and Biostatistics, University of Western Ontario, LHSC-UC, 339 Windermere Road, London, Ontario N6A 5A5, Canada
| | - Eyad Althenayan
- Critical Care & Neuro-Critical Care Medicine, Program in Critical Care, Department of Medicine, London Health Sciences Centre, University of Western Ontario, LHSC-UC, 339 Windermere Road, London, Ontario N6A 5A5, Canada
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Naiman M, Shanley P, Garrett F, Kulstad E. Evaluation of advanced cooling therapy’s esophageal cooling device for core temperature control. Expert Rev Med Devices 2016; 13:423-33. [DOI: 10.1080/17434440.2016.1174573] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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Vaity C, Al-Subaie N, Cecconi M. Cooling techniques for targeted temperature management post-cardiac arrest. CRITICAL CARE : THE OFFICIAL JOURNAL OF THE CRITICAL CARE FORUM 2015; 19:103. [PMID: 25886948 PMCID: PMC4361155 DOI: 10.1186/s13054-015-0804-1] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
This article is one of ten reviews selected from the Annual Update in Intensive Care and Emergency Medicine 2015 and co-published as a series in Critical Care. Other articles in the series can be found online at http://ccforum.com/series/annualupdate2015. Further information about the Annual Update in Intensive Care and Emergency Medicine is available from http://www.springer.com/series/8901.
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9
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Kulstad EB, Naiman M, Shanley P, Garrett F, Haryu T, Waller D, Azarafrooz F, Courtney DM. Temperature modulation with an esophageal heat transfer device - a pediatric swine model study. BMC Anesthesiol 2015; 15:16. [PMID: 25685058 PMCID: PMC4327961 DOI: 10.1186/1471-2253-15-16] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2014] [Accepted: 01/15/2015] [Indexed: 12/18/2022] Open
Abstract
Background An increasing number of conditions appear to benefit from control and modulation of temperature, but available techniques to control temperature often have limitations, particularly in smaller patients with high surface to mass ratios. We aimed to evaluate a new method of temperature modulation with an esophageal heat transfer device in a pediatric swine model, hypothesizing that clinically significant modulation in temperature (both increases and decreases of more than 1°C) would be possible. Methods Three female Yorkshire swine averaging 23 kg were anesthetized with inhalational isoflurane prior to placement of the esophageal device, which was powered by a commercially available heat exchanger. Swine temperature was measured rectally and cooling and warming were performed by selecting the appropriate external heat exchanger mode. Temperature was recorded over time in order to calculate rates of temperature change. Histopathology of esophageal tissue was performed after study completion. Results Average swine baseline temperature was 38.3°C. Swine #1 exhibited a cooling rate of 3.5°C/hr; however, passive cooling may have contributed to this rate. External warming blankets maintained thermal equilibrium in swine #2 and #3, demonstrating maximum temperature decrease of 1.7°C/hr. Warming rates averaged 0.29°C/hr. Histopathologic analysis of esophageal tissue showed no adverse effects. Conclusions An esophageal heat transfer device successfully modulated the temperature in a pediatric swine model. This approach to temperature modulation may offer a useful new modality to control temperature in conditions warranting temperature management (such as maintenance of normothermia, induction of hypothermia, fever control, or malignant hyperthermia).
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Affiliation(s)
- Erik B Kulstad
- Department of Emergency Medicine, Advocate Christ Medical Center, Oak Lawn, IL 60453 USA ; Department of Emergency Medicine, University of Illinois at Chicago, Chicago, IL 60612 USA
| | - Melissa Naiman
- Center for Advanced Design, Research, and Exploration (CADRE), University of Illinois at Chicago, 1737 W. Polk Street, Suite B14, Chicago, IL 60612 USA
| | - Patrick Shanley
- Advanced Cooling Therapy, 3440 S. Dearborn Street, #215-S, Chicago, IL 60616 USA
| | - Frank Garrett
- Garrett Technologies, 1955 Techny Road, Suite #1, Northbrook, IL 60062 USA
| | - Todd Haryu
- PreLabs, LLC, 33 Chicago Avenue, Oak Park, IL 60302 USA
| | - Donald Waller
- PreLabs, LLC, 33 Chicago Avenue, Oak Park, IL 60302 USA
| | - Farshid Azarafrooz
- Department of Comparative Medicine, Loyola University Medical Center, Maywood, IL 60153 USA
| | - Daniel Mark Courtney
- Department of Emergency Medicine, Feinberg School of Medicine, Northwestern University, 211 E. Ontario suite 200, Chicago, IL 60611 USA
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10
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Kulstad EB, Courtney DM, Waller D. Induction of therapeutic hypothermia via the esophagus: a proof of concept study. World J Emerg Med 2014; 3:118-22. [PMID: 25215049 DOI: 10.5847/wjem.j.issn.1920-8642.2012.02.007] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2012] [Accepted: 04/12/2012] [Indexed: 11/19/2022] Open
Abstract
BACKGROUND Induction of hypothermia (a 4 °C decrease from baseline) improves outcomes in adult cardiac arrest and neonatal hypoxic ischemic encephalopathy, and may benefit other conditions as well. Methods used to implement or prevent hypothermia typically require skin contact with blankets or pads or intravascular access with catheter devices. The study was to evaluate the potential to induce mild therapeutic hypothermia via an esophageal route in a porcine model. METHODS Single-animal proof-of-concept study of a prototype esophageal device in a 70 kg Yorkshire swine. We measured the rate of temperature change after placement of a prototype device to induce hypothermia via the esophagus, and compared this rate to known temperature changes that occur under similar laboratory conditions without a hypothermic device. RESULTS Swine temperature decreased from a starting temperature of 37.8 °C to 33.8 °C (achieving the goal of a 4 °C decrease) in 175 minutes, resulting in a cooling rate of 1.37 °C/h. Histopathology of the esophagus showed normal tissue without evidence of injury. CONCLUSION A prototype of an esophageal cooling device induced hypothermia effectively in a large single-swine model.
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Affiliation(s)
- Erik B Kulstad
- Department of Emergency Medicine, Advocate Christ Medical Center, Oak Lawn, IL, USA
| | - D Mark Courtney
- Department of Emergency Medicine, Feinberg School of Medicine, Northwestern University, Chicago, IL, USA
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11
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Kulstad E, Metzger AK, Courtney DM, Rees J, Shanley P, Matsuura T, McKnite S, Lurie K. Induction, maintenance, and reversal of therapeutic hypothermia with an esophageal heat transfer device. Resuscitation 2013; 84:1619-24. [DOI: 10.1016/j.resuscitation.2013.06.019] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2013] [Revised: 05/22/2013] [Accepted: 06/20/2013] [Indexed: 10/26/2022]
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