The Impact of Anaesthesia Protocols on BOLD Fmri Validity in Laboratory Rodents –A Systematic Review
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Zurich Open Repository and Archive University of Zurich Main Library Strickhofstrasse 39 CH-8057 Zurich www.zora.uzh.ch Year: 2019 The impact of anaesthesia protocols on BOLD fMRI validity in laboratory rodents –a systematic review Steiner, Aline Rebecca Posted at the Zurich Open Repository and Archive, University of Zurich ZORA URL: https://doi.org/10.5167/uzh-175731 Dissertation Published Version Originally published at: Steiner, Aline Rebecca. The impact of anaesthesia protocols on BOLD fMRI validity in laboratory rodents –a systematic review. 2019, University of Zurich, Vetsuisse Faculty. Departement für klinische Diagnostik und Services, Abteilung für Anästhesiologie der Vetsuisse-Fakultät Universität Zürich Vorsteherin Departement: Prof. Dr. med. vet. FVH Regina Hofmann-Lehmann Leiterin Abteilung: Prof. Dr. med. vet. PhD, Dipl. ECVAA Regula Bettschart-Wolfensberger The Impact of Anaesthesia Protocols on BOLD fMRI Validity in Laboratory Rodents – a Systematic Review Inaugural-Dissertation zur Erlangung der Doktorwürde der Vetsuisse-Fakultät Universität Zürich vorgelegt von Aline Rebecca Steiner Tierärztin von Frutigen, Bern genehmigt auf Antrag von Prof. Dr. med. vet. PhD, Dipl. ECVAA Regula Bettschart-Wolfensberger, Referentin Dr. med. vet., Dipl. ECVPH Sonja Hartnack, Co-Referentin 2019 Table of Contents Table of Contents ..................................................................................................... 3 Abstract ..................................................................................................................... 7 Zusammenfassung ................................................................................................... 7 1 Introduction ....................................................................................................... 9 1.1 BOLD fMRI for functional neuroimaging ............................................................ 9 1.2 BOLD fMRI and anaesthesia ............................................................................... 9 1.3 Aim of the review ................................................................................................10 2 Materials and Methods .................................................................................... 11 2.1 Systematic literature search ..............................................................................11 2.2 Screening and study selection...........................................................................12 2.3 Data extraction ....................................................................................................13 2.4 Data analysis .......................................................................................................13 2.5 Risk of bias assessment ....................................................................................14 3 Results ............................................................................................................. 15 3.1 Systematic literature search ..............................................................................15 3.2 Data structure......................................................................................................18 3.3 Effects of physiological parameters on BOLD signals.....................................22 3.3.1 Rats ..................................................................................................................22 3.3.1.1 Effects of changes in physiological parameters on the baseline BOLD signal ....... 22 3.3.1.1.1 Hypoxaemia and concomitant hypoxia .............................................................. 22 3.3.1.1.2 Hyperoxaemia and hyperoxia ............................................................................ 23 3.3.1.1.3 Hypercapnia ....................................................................................................... 23 3.3.1.1.4 Hyperoxia/hypercapnia ...................................................................................... 24 3.3.1.1.5 Apnoea ............................................................................................................... 24 3.3.1.1.6 Hypotension or decrease in arterial blood pressure .......................................... 24 3.3.1.1.7 Hypertension or increase in arterial blood pressure .......................................... 25 3.3.1.1.8 Single reports ..................................................................................................... 26 3.3.1.1.9 Summary ............................................................................................................ 26 3.3.1.2 Effects of changes in physiological parameters on BOLD signal responses to peripheral stimulation .............................................................................................. 26 3.3.1.2.1 Electrical stimulation – changes in inspiratory gas compositions ...................... 27 3.3.1.2.2 Electrical stimulation – naturally occurring changes in physiological parameters ........................................................................................................................... 28 3.3.1.2.3 Chemical somatosensory stimulation – naturally occurring changes in arterial blood pressure ................................................................................................... 28 3.3.1.2.4 Mechanical visceral stimulation – naturally occurring changes in arterial blood pressure ............................................................................................................. 29 3.3.1.2.5 Summary ............................................................................................................ 29 3.3.1.3 Effects of changes in physiological parameters on BOLD signal responses to central stimulation ................................................................................................... 29 3.3.1.4 Effects of changes in physiological parameters on resting state BOLD measurements ........................................................................................................ 30 3.3.1.5 Conclusion............................................................................................................... 31 3.3.2 Mice ..................................................................................................................36 3.4 BOLD responses and functional connectivity in awake animals and under different anaesthetic conditions ........................................................................37 3.4.1 Rats ..................................................................................................................37 3.4.1.1 Effects of different states of anaesthesia on BOLD responses to experimental changes in physiological parameters ...................................................................... 37 3 3.4.1.2 Effects of different states of anaesthesia on resting state BOLD measurements .. 38 3.4.1.2.1 Isoflurane versus awake .................................................................................... 39 3.4.1.2.2 Isoflurane concentrations ................................................................................... 40 3.4.1.2.3 Propofol doses ................................................................................................... 42 3.4.1.2.4 Isoflurane versus propofol .................................................................................. 43 3.4.1.2.5 Medetomidine doses .......................................................................................... 43 3.4.1.2.6 Isoflurane versus (dex)medetomidine ................................................................ 44 3.4.1.2.7 (Dex)medetomidine combined with isoflurane ................................................... 45 3.4.1.2.8 Isoflurane versus ketamine/xylazine .................................................................. 46 3.4.1.2.9 Medetomidine and ketamine .............................................................................. 47 3.4.1.2.10 Medetomidine versus α-chloralose .................................................................. 48 3.4.1.2.11 Urethane .......................................................................................................... 48 3.4.1.2.12 Multiple comparisons ....................................................................................... 48 3.4.1.2.13 Summary .......................................................................................................... 49 3.4.1.3 Effects of different states of anaesthesia on BOLD responses to peripheral stimulation ............................................................................................................... 50 3.4.1.3.1 Electrical stimulation – (dex)medetomidine, isoflurane and combined (dex)medetomidine/isoflurane ............................................................................ 50 3.4.1.3.2 Electrical stimulation – α-chloralose versus various .......................................... 52 3.4.1.3.3 Electrical stimulation – awake versus anaesthetised ......................................... 52 3.4.1.3.4 Mechanical stimulation ....................................................................................... 53 3.4.1.3.5 Chemical somatosensory stimulation ................................................................ 53 3.4.1.3.6 Visceral stimulation ............................................................................................ 54 3.4.1.3.7 Summary ...........................................................................................................