Clinical trial NCT03726580: Evaluation of Neurotoxic Effect of Sevoflurane-Based AnaesthesiaGuided by Short-Term Olfactory Identification
Official title: Evaluation of Neurotoxic Effect of Sevoflurane-Based Anaesthesia Guided by Significant Short-Term Olfactory Identification Impairment in Old Age
Study type: OBSERVATIONAL
Overall status: COMPLETED
Conditions: Neurotoxic Effect of Sevoflurane-Based Anaesthesia
Keywords: General anesthesia.
neurotoxicity,
olfaction,
olfactory identification.
sevoflurane.
Lead sponsor: Tanta University
Sponsor class: OTHER
Collaborators: name: Amer Galal Younis,MD
First posted: 2018-10-31
Enrollment: 600
Sex: ALL
Minimum age (years): 60
Maximum age (years): 75
Standard ages: ADULT
OLDER_ADULT
Accepts healthy volunteers: yes
Observational model: CASE_CONTROL
Time perspective: PROSPECTIVE
Sampling method: PROBABILITY_SAMPLE
Study population: Six hundred patients of both sex with inclusion following criteria: American Society of Anaesthesiologists I and II physical status aged from 60 to 75years scheduled for elective surgery with the anticipated duration of 100-120 min (surgical procedures included hernia repair, varicose vein surgery, incisional hernia repair, minor gynecological procedures, lower limb orthopedic procedures, and minor urological procedures)

Brief summary: Nowadays there is increasing doubts about the safety of anesthesia . Anesthesiologists have to console the worried patients, who are anxious about the potential risks of anesthetic-induced brain damage, by suggesting that any detrimental effects would be "mild".Anesthetics are responsible for postoperative taste and odor defects and cognitive dysfunction.

Detailed description: Aims: The aim of this study is to assess the effect of isoflurane, sevoflurane, propofol and regional anesthesia on the olfactory threshold, olfactory identification and endocrine regulation of associative memory in the postoperative period in old age group.

Methods: 600 patients (\> 60years ) fulfilling the criteria of the American society of anesthesiologists and II status were selected for this prospective single-blinded randomized controlled study. Patients were randomized into one of four groups to receive regional anesthesia (control group), general anesthesia with sevoflurane, general anesthesia with isoflurane and total intravenous anesthesia with propofol.

Mini-Mental State Examination (MMSE), olfactory threshold, and olfactory identification were tested at 12 hours preoperatively (T0), at 3 hours postoperatively (T1) and at the time of discharge or postoperative 3 days (T2). In addition, serum melatonin levels were estimated at T0 and T1.

N-butyl alcohol was used to test the olfactory threshold and the Pocket Smell Test TM series (PSTs) was used to test olfactory identification. Data were analyzed using the one-way analysis of variance, Kruskal-Wallis or Mann-Whitney tests.

Eligibility criteria: Inclusion Criteria:

* American Society of Anaesthesiologists I and II physical status
* aged from 60 to 75years
* scheduled for elective surgery with the anticipated duration of 100-120 min.
* surgical procedures included hernia repair,
* varicose vein surgery,
* incisional hernia repair,
* minor gynecological procedures,
* lower limb orthopedic procedures,
* minor urological procedures

Exclusion Criteria:

* Patients with recent airway infection,
* allergic rhinitis,
* nasal polyps,
* history of alcoholism,
* smoking,
* mental retardation,
* psychiatric illness,
* neurosurgical or oto-rhino-laryngeal surgery
* patients with a history of olfactory deficits and cognitive impairment

Primary outcomes:
measure: The changes in Mini-Mental State Examination (MMSE)
timeFrame: basically at 12 hours preoperatively (T0), then 3 hours postoperatively (T1) and at the time of discharge or postoperative 3 days (T2)
measure: The changes in olfactory threshold
timeFrame: basically at 12 hours preoperatively (T0), then 3 hours postoperatively (T1) and at the time of discharge or postoperative 3 days (T2)
measure: The changes in olfactory identification
timeFrame: basically at 12 hours preoperatively (T0), then 3 hours postoperatively (T1) and at the time of discharge or postoperative3 days (T2)
Secondary outcomes:
measure: The changes in olfactory melatonin levels
timeFrame: serum melatonin levels were estimated basically at 12 hours preoperatively (T0), then 3 hours postoperatively (T1) and at the time of discharge or postoperative3 days (T2)
Other outcomes:
Locations:
city: Tanta
country: Egypt
facility: Ahmed Said Elgebaly
Study officials:
affiliation: Tanta University
name: ahmed S Elgebaly, MD
role: STUDY_DIRECTOR
References:
citation: Friedrich H, Caversaccio M, Landis BN. Olfactory disorders after general anesthesia. J Clin Anesth. 2013 Feb;25(1):73. doi: 10.1016/j.jclinane.2012.07.002. Epub 2012 Dec 12. No abstract available.
citation: Shen X, Liu Y, Xu S, Zhao Q, Guo X, Shen R, Wang F. Early life exposure to sevoflurane impairs adulthood spatial memory in the rat. Neurotoxicology. 2013 Dec;39:45-56. doi: 10.1016/j.neuro.2013.08.007. Epub 2013 Aug 27.
citation: Saravanan B, Kundra P, Mishra SK, Surianarayanan G, Parida PK. Effect of anaesthetic agents on olfactory threshold and identification - A single blinded randomised controlled study. Indian J Anaesth. 2018 Aug;62(8):592-598. doi: 10.4103/ija.IJA_245_18.
citation: Obayashi K, Saeki K, Iwamoto J, Tone N, Tanaka K, Kataoka H, Morikawa M, Kurumatani N. Physiological Levels of Melatonin Relate to Cognitive Function and Depressive Symptoms: The HEIJO-KYO Cohort. J Clin Endocrinol Metab. 2015 Aug;100(8):3090-6. doi: 10.1210/jc.2015-1859. Epub 2015 Jun 8.
citation: Kalsbeek A, Cutrera RA, Van Heerikhuize JJ, Van Der Vliet J, Buijs RM. GABA release from suprachiasmatic nucleus terminals is necessary for the light-induced inhibition of nocturnal melatonin release in the rat. Neuroscience. 1999;91(2):453-61. doi: 10.1016/s0306-4522(98)00635-6.
citation: Lehrner JP, Gluck J, Laska M. Odor identification, consistency of label use, olfactory threshold and their relationships to odor memory over the human lifespan. Chem Senses. 1999 Jun;24(3):337-46. doi: 10.1093/chemse/24.3.337.
citation: Rawal S, Hoffman HJ, Honda M, Huedo-Medin TB, Duffy VB. The Taste and Smell Protocol in the 2011-2014 US National Health and Nutrition Examination Survey (NHANES): Test-Retest Reliability and Validity Testing. Chemosens Percept. 2015 Sep;8(3):138-148. doi: 10.1007/s12078-015-9194-7. Epub 2015 Aug 7.
citation: Jackman AH, Doty RL. Utility of a three-item smell identification test in detecting olfactory dysfunction. Laryngoscope. 2005 Dec;115(12):2209-12. doi: 10.1097/01.mlg.0000183194.17484.bb.
citation: Kostopanagiotou G, Kalimeris K, Kesidis K, Matsota P, Dima C, Economou M, Papageorgiou C. Sevoflurane impairs post-operative olfactory memory but preserves olfactory function. Eur J Anaesthesiol. 2011 Jan;28(1):63-8. doi: 10.1097/EJA.0b013e328340702b.
citation: Lotsch J, Reichmann H, Hummel T. Different odor tests contribute differently to the evaluation of olfactory loss. Chem Senses. 2008 Jan;33(1):17-21. doi: 10.1093/chemse/bjm058. Epub 2007 Aug 30.
citation: Lecker I, Yin Y, Wang DS, Orser BA. Potentiation of GABAA receptor activity by volatile anaesthetics is reduced by alpha5GABAA receptor-preferring inverse agonists. Br J Anaesth. 2013 Jun;110 Suppl 1(Suppl 1):i73-81. doi: 10.1093/bja/aet038. Epub 2013 Mar 27.
citation: Ren Y, Zhang FJ, Xue QS, Zhao X, Yu BW. Bilateral inhibition of gamma-aminobutyric acid type A receptor function within the basolateral amygdala blocked propofol-induced amnesia and activity-regulated cytoskeletal protein expression inhibition in the hippocampus. Anesthesiology. 2008 Nov;109(5):775-81. doi: 10.1097/ALN.0b013e31818a37c4.
citation: Salmi E, Kaisti KK, Metsahonkala L, Oikonen V, Aalto S, Nagren K, Hinkka S, Hietala J, Korpi ER, Scheinin H. Sevoflurane and propofol increase 11C-flumazenil binding to gamma-aminobutyric acidA receptors in humans. Anesth Analg. 2004 Nov;99(5):1420-1426. doi: 10.1213/01.ANE.0000135409.81842.31.
citation: Alkire MT, Gorski LA. Relative amnesic potency of five inhalational anesthetics follows the Meyer-Overton rule. Anesthesiology. 2004 Aug;101(2):417-29. doi: 10.1097/00000542-200408000-00023.
citation: Shen FY, Song YC, Guo F, Xu ZD, Li Q, Zhang B, Ma YQ, Zhang YQ, Lin R, Li Y, Liu ZQ. Cognitive Impairment and Endoplasmic Reticulum Stress Induced by Repeated Short-Term Sevoflurane Exposure in Early Life of Rats. Front Psychiatry. 2018 Aug 2;9:332. doi: 10.3389/fpsyt.2018.00332. eCollection 2018.