Do heat and moisture exchangers in the anaesthesia breathing circuit preserve body temperature in dogs undergoing anaesthesia for magnetic resonance imaging?

Khenissi, Latifa; Covey‐Crump, Gwen; Knowles, Toby G; Murrell, Joanna C

doi:10.1016/j.vaa.2016.05.016

Cited by 14 publications

(12 citation statements)

References 24 publications

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“…Since it is not possible to use a heating device that is effective during surgery, it was necessary to design a heat insulating material that does not react to magnetism. For a dog that underwent an MRI exam in 2017, an attempt was made to warm the air in the circuit by attaching a heat and moisture exchanger between the circuit hose and the tracheal tube, but the effectiveness of it was not demonstrated [ 20 ]. An MRI exam has a relatively short anesthesia time compared to surgery.…”

Section: Introductionmentioning

confidence: 99%

Effect of an Insulation Device in Preventing Hypothermia during Magnetic Resonance Imaging Examinations for Dogs and Cats under General Anesthesia

Onozawa

Azakami

Seki

et al. 2021

Animals

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Dogs and cats under general anesthesia may develop hypothermia. When performing a magnetic resonance imaging (MRI) examination, it is not possible to place a magnetic material in the MRI room, and MRI equipment requires a low room temperature. This study investigated the effectiveness of a heat insulating device that prevented hypothermia during MRI examinations in dogs and cats. The animals that underwent MRI examinations under general anesthesia were divided into control groups (no covering) and heat insulating groups (wearing bubble wrap and down cloth blankets), and their body temperatures were measured before and after the MRI examinations. The changes in body temperatures were as follows: control dogs (n = 17), median of −1.0 (from −2.5 to 0.3) °C; heat insulated dogs (n = 7), −0.3 (from −0.8 to 0.2) °C; control cats (n = 14), −1.85 (from −2.7 to −0.6) °C; and heat insulated cats (n = 12), −0.8 (from −1.5 to −0.1) °C. These results revealed that the bubble wrap and down cloth blanket significantly prevented hypothermia and heat loss from the body surface during MRI examinations of dogs and cats.

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Section: Introductionmentioning

confidence: 99%

Effect of an Insulation Device in Preventing Hypothermia during Magnetic Resonance Imaging Examinations for Dogs and Cats under General Anesthesia

Onozawa

Azakami

Seki

et al. 2021

Animals

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“…One study reported that weight, coat length, body condition score and breed size were significantly associated with the difference between the rectal and axillary temperature [11], however this was not assessed routinely in the literature, nor in this study. The use of heat and moisture exchangers to reduce the effects of cold carrier gases has previously been examined however they did not have significant effects on heat loss [25,26], and all cases in this study experienced a decrease of their body temperature. Active warming with either forced air blankets or heated mats has been shown to aid maintenance of body temperature [27] and may have been a source of error if the thermometer was placed too close to these devices, however neither of these interventions were used in this study.…”

Section: Discussionmentioning

confidence: 81%

“…Other factors may also influence heat loss and vasomotor control. Alpha-2 agonists result in peripheral vasoconstriction which reduces heat loss [25], which may result in a lower measured peripheral temperature, but may also have caused the increase in core body temperature noted in one dog. One study reported that weight, coat length, body condition score and breed size were significantly associated with the difference between the rectal and axillary temperature [11], however this was not assessed routinely in the literature, nor in this study.…”

Section: Discussionmentioning

confidence: 99%

Body temperature measurement in anesthetized dogs – comparison of nasal, axillary, rectal and esophageal temperature

Ward,

McMillan,

Gittel

2023

Tierarztl Prax Ausg K Kleintiere Heimtiere

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Objective To evaluate different methods of monitoring body temperature in anesthetized dogs with comparison to core temperature obtained via esophageal probe. Methods Client-owned dogs undergoing general anesthesia for various procedures were included in this observational study. The temperature was taken sequentially every 10 minutes from the rectum, axilla, and nasal cavity with a digital thermistor thermometer, and compared to esophageal core temperature via paired t-tests. Differences from the gold standard esophageal temperature were assessed via Bland-Altman plots and further evaluated for factors like time under anesthesia and presence of Hypo-/Normo- or Hyperthermia. In addition, it was analyzed whether a correction factor for peripheral measurement sites (nasal cavity and axilla) would be applicable in a reliable representation of the body temperature. The level of significance in all tests was set at p<0.05. Results In this study, 95 simultaneous temperature measurements at the 4 different sites were obtained from 30 dogs. Mean difference and limits of agreement from esophageal temperature for the different measurement methods were 0.0±0.72°C for rectal temperature, −1.2±1.42°C for axillary and −1.0±2.02°C for nasal temperature. Axillary and nasal temperatures were not significantly different (p=0.5721 and p=0.9287, respectively) from esophageal temperature with a +1.2°C and +1°C correction factor, respectively. Conclusion and Clinical relevance During perioperative temperature measurement in anesthetized patients, rectal and esophageal measurements can be used interchangeable. However, if these are not available, the use of axillary or nasal sites is only reliable after applying a correction factor.

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“…Hot water blankets or simple blankets can be used, but it might be necessary to remove them depending on the region scanned (Julie A.S., 2015). Even the use of a heat and moisture exchanger (HME) cannot help in preventing heat loss and preserving body temperature during MRI (Khenissi L. et al, 2017). HME is a device placed between the patient and the breathing system and has the aim to conserve exhaled water and return it to the patient in the inspired gas (Dorsch & Dorsch 2014).…”

Section: Monitoring and Complications During General Anesthesia For Imentioning

confidence: 99%

“…HME is a device placed between the patient and the breathing system and has the aim to conserve exhaled water and return it to the patient in the inspired gas (Dorsch & Dorsch 2014). For a study involving dogs, patients weighing less than 10 kg (Khenissi L. et al, 2017) were premedicated with an opioid (butorphanol) and dexmedetomidine, induced with propofol and maintained with isoflurane in 100% oxygen during the entire MRI scan. Whilst the use of an HME had no benefit in preserving body temperature, the patients premedicated with dexmedetomidine maintained better rectal temperature compared to dogs that were administered other drugs.…”

Section: Monitoring and Complications During General Anesthesia For Imentioning

confidence: 99%

Anesthesia protocols and techniques for imaging diagnosis procedures in small animals

Degan¹,

Şonea²

2019

Rom Biotechnol Lett.

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Nowadays, imaging diagnosis play an important role in veterinary medicine, magnetic resonance imaging (MRI) being considered the top tool in diagnosing pathologies of different tissues and organs. Same as in pediatric medicine, this procedure has an impediment, represented by general anesthesia, whose effects upon the organism can increase risks. The importance of anesthesia during imaging diagnosis stands in the fact that the patients have to be motionless in order to achieve good quality images. General anesthesia for small animals during these procedures can be done with either the use of a total intravenous anesthesia or by using inhalation anesthesia. Both techniques described in studies have provided good results and are intended in helping practitioners all over the world. The purpose of this article is to highlight the most common anesthetic protocols and risks associated with them, as well as the aspects most seen by an anesthetist and imagist during an MRI scan.

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Do heat and moisture exchangers in the anaesthesia breathing circuit preserve body temperature in dogs undergoing anaesthesia for magnetic resonance imaging?

Abstract: Using an HME did not alter body temperature in dogs weighing <10 kg undergoing an MRI, but including dexmedetomidine in the premedication regimen seemed to preserve the body temperature during anaesthesia.

Cited by 14 publications

References 24 publications

Effect of an Insulation Device in Preventing Hypothermia during Magnetic Resonance Imaging Examinations for Dogs and Cats under General Anesthesia

Effect of an Insulation Device in Preventing Hypothermia during Magnetic Resonance Imaging Examinations for Dogs and Cats under General Anesthesia

Body temperature measurement in anesthetized dogs – comparison of nasal, axillary, rectal and esophageal temperature

Anesthesia protocols and techniques for imaging diagnosis procedures in small animals

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