Appendix
Based on the literature review of hyperbaric cardiopulmonary resuscitation by Schmitz et al.,12 to which SN and TS also contributed, we modified the search string used to focus on defibrillation during HBOT.
We therefore added the search terms “HBOT”, “defibrillation”, “cardioversion”, and “CPR” to the search string, while removing “chest compression” and “heart massage” from the original search string.
Search string used in databases:
(HBOT OR hyperbaric OR pressure chamber OR decompression) AND (defibrillation OR cardioversion OR ventricular fibrillation OR CPR OR cardiopulmonary resuscitation OR resuscitation OR cardiac arrest OR heart arrestOR ALS OR advanced life support OR life support)
For CINAHL, the literature search was conducted using the “Advanced search” within the search mode “Proximity”. We also used the expanders “Apply related words”, “Also search within the full text of the articles” and “Apply equivalent subjects”. In the Cochrane Library the search was carried out in the “Title Abstract Keyword” category. Word variations were also included. For EMBASE, the search was performed using the “Broad search”, while in PubMed we used the “All Fields” category.
A language filter was applied in order to ensure that only articles in German and English were included. The aforementioned databases independently adapted the search string according to their internal algorithms (see below).
Search string adapted by CINAHL:
The adapted search strategy was not specified.
Search string adapted by the Cochrane Library:
((HBOT OR hyperbaric OR pressure chamber OR decompression) AND (defibrillation OR cardioversion OR ventricular fibrillation OR CPR OR cardiopulmonary resuscitation OR resuscitation OR cardiac arrest OR heart arrestOR ALS OR advanced life support OR life support)):ti,ab,kw (Word variations have been searched)
Search string adapted by EMBASE:
(hbot OR hyperbaric OR 'pressure chamber'/exp OR 'pressure chamber' OR (('pressure'/exp OR pressure) AND ('chamber'/exp OR chamber)) OR 'decompression'/exp OR decompression) AND ('defibrillation'/exp OR defibrillation OR 'cardioversion'/exp OR cardioversion OR 'ventricular fibrillation'/exp OR 'ventricular fibrillation' OR (ventricular AND ('fibrillation'/exp OR fibrillation)) OR cpr OR 'cardiopulmonary resuscitation'/exp OR 'cardiopulmonary resuscitation' OR (cardiopulmonary AND ('resuscitation'/exp OR resuscitation)) OR 'resuscitation'/exp OR resuscitation OR 'cardiac arrest'/exp OR 'cardiac arrest' OR (('cardiac'/exp OR cardiac) AND ('arrest'/exp OR arrest)) OR 'heart arrest'/exp OR 'heart arrest' OR (('heart'/exp OR heart) AND ('arrest'/exp OR arrest)) OR als OR 'advanced life support'/exp OR 'advanced life support' OR (advanced AND ('life'/exp OR life) AND ('support'/exp OR support)) OR 'life support' OR (('life'/exp OR life) AND ('support'/exp OR support))) AND ([english]/lim OR [german]/lim)
Search string adapted by PubMed:
(("HBOT"[All Fields] OR ("hyperbaric"[All Fields] OR "hyperbarics"[All Fields]) OR (("pressure"[MeSH Terms] OR "pressure"[All Fields] OR "pressures"[All Fields] OR "pressure s"[All Fields] OR "pressurisation"[All Fields] OR "pressurised"[All Fields] OR "pressuriser"[All Fields] OR "pressurization"[All Fields] OR "pressurizations"[All Fields] OR "pressurize"[All Fields] OR "pressurized"[All Fields] OR "pressurizer"[All Fields] OR "pressurizes"[All Fields] OR "pressurizing"[All Fields]) AND ("chamber"[All Fields] OR "chamber s"[All Fields] OR "chambered"[All Fields] OR "chambers"[All Fields])) OR ("decompress"[All Fields] OR "decompressed"[All Fields] OR "decompresses"[All Fields] OR "decompressing"[All Fields] OR "decompression"[MeSH Terms] OR "decompression"[All Fields] OR "decompressions"[All Fields] OR "decompressive"[All Fields])) AND ("defibrilator"[All Fields] OR "defibrillate"[All Fields] OR "defibrillated"[All Fields] OR "defibrillates"[All Fields] OR "defibrillating"[All Fields] OR "defibrillations"[All Fields] OR "defibrillator s"[All Fields] OR "defibrillators"[MeSH Terms] OR "defibrillators"[All Fields] OR "defibrillator"[All Fields] OR "electric countershock"[MeSH Terms] OR ("electric"[All Fields] AND "countershock"[All Fields]) OR "electric countershock"[All Fields] OR "defibrillation"[All Fields] OR ("electric countershock"[MeSH Terms] OR ("electric"[All Fields] AND "countershock"[All Fields]) OR "electric countershock"[All Fields] OR "cardioversion"[All Fields] OR "cardioversions"[All Fields]) OR ("ventricular fibrillation"[MeSH Terms] OR ("ventricular"[All Fields] AND "fibrillation"[All Fields]) OR "ventricular fibrillation"[All Fields]) OR ("cardiopulmonary resuscitation"[MeSH Terms] OR ("cardiopulmonary"[All Fields] AND "resuscitation"[All Fields]) OR "cardiopulmonary resuscitation"[All Fields] OR "cpr"[All Fields]) OR ("cardiopulmonary resuscitation"[MeSH Terms] OR ("cardiopulmonary"[All Fields] AND "resuscitation"[All Fields]) OR "cardiopulmonary resuscitation"[All Fields]) OR ("resuscitability"[All Fields] OR "resuscitate"[All Fields] OR "resuscitated"[All Fields] OR "resuscitates"[All Fields] OR "resuscitating"[All Fields] OR "resuscitation"[MeSH Terms] OR "resuscitation"[All Fields] OR "resuscitations"[All Fields] OR "resuscitative"[All Fields] OR "resuscitator"[All Fields] OR "resuscitators"[All Fields]) OR ("heart arrest"[MeSH Terms] OR ("heart"[All Fields] AND "arrest"[All Fields]) OR "heart arrest"[All Fields] OR ("cardiac"[All Fields] AND "arrest"[All Fields]) OR "cardiac arrest"[All Fields]) OR ("heart arrest"[MeSH Terms] OR ("heart"[All Fields] AND "arrest"[All Fields]) OR "heart arrest"[All Fields]) OR ("adv life sci"[Journal] OR "als"[All Fields]) OR (("advance"[All Fields] OR "advanced"[All Fields] OR "advancement"[All Fields] OR "advancements"[All Fields] OR "advances"[All Fields] OR "advancing"[All Fields]) AND ("life"[MeSH Terms] OR "life"[All Fields]) AND ("support"[All Fields] OR "support s"[All Fields] OR "supported"[All Fields] OR "supporter"[All Fields] OR "supporter s"[All Fields] OR "supporters"[All Fields] OR "supporting"[All Fields] OR "supportive"[All Fields] OR "supportiveness"[All Fields] OR "supports"[All Fields])) OR (("life"[MeSH Terms] OR "life"[All Fields]) AND ("support"[All Fields] OR "support s"[All Fields] OR "supported"[All Fields] OR "supporter"[All Fields] OR "supporter s"[All Fields] OR "supporters"[All Fields] OR "supporting"[All Fields] OR "supportive"[All Fields] OR "supportiveness"[All Fields] OR "supports"[All Fields])))) AND (english[Filter] OR german[Filter])