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Van Ooij et al. Supplementary Table 1: Search strategy for systematic review

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Stokes, et al. 56 (1) 2026 Appendix I-IV 

Appendix I: Search strategy

Appendix II: Full text exclusion

Appendix III: Critical Appraisal

Appendix IV: Characteristics of Included Studies

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Meijering, et al. 56 (1) - Appendix A-C

Appendix A
The SDM-knowledge questionnaire (SDM-K-Q) is shown on the following pages.

Questionnaire: Shared decision-making

This questionnaire is about ‘shared decision-making’ in healthcare. You may have heard about this before. Patients and healthcare providers think of ‘shared decision-making’ as increasingly important.
With this questionnaire, we aim to understand your knowledge about the topic of ‘shared decision-making.’ The questions are not about your satisfaction with your healthcare provider but rather about what you know about ‘shared decision-making.’
While answering the questions, reflect on the last time you or a loved one discussed a treatment with your doctor in the hospital. Even if you are not currently a patient, we invite you to complete this questionnaire.
Your responses will remain anonymous, ensuring that no one can identify your answers as yours.
Completing the questionnaire will take about 10 minutes.

1.1.    Start questionnaire

Have you ever heard of the term shared decision-making?
You can select more than one answer option
□    No
□    Yes, during a visit to a doctor or other healthcare provider
□    Yes, I have read about it online
□    Yes, I have seen it in a decision aid
□    Yes, I have seen the national campaign about shared decision- making
□    Yes, other:     
□    I don’t know
For all the questions that follow, you may select only one response option.

1.    What does shared decision-making mean according to you?
o    The doctor asks your permission for a treatment
o    The doctor discusses the treatment options with you and collaborates to choose the one that best aligns with your wishes
o    Doctors who specialize in your condition consult with each other and give advice about the treatment
o    I don’t know

2.    Which of the following aspects is the most important in shared decision-making?
o    Patients should be involved in the decisions about their own bodies
o    Doctors provide their opinion about treatments
o    Family members of patients are included in choosing the treatment
o    I don’t know
 
3.    Which of these three questions is the best one to ask to support shared decision-making?
o    "What can I do to recover?"
o    "What does this treatment involve in my situation?"
o    "When can we schedule the next appointment?"
o    I don’t know

4.    What is the best approach if your healthcare provider has a different opinion than you do?
o    The healthcare provider is responsible for your treatment and thus makes the final decision
o    The patient’s preference should always have priority
o    You and the healthcare provider try to agree on a treatment choice by discussing it together
o    I don’t know

5.    What is the most important aspect of shared decision-making when it comes to choosing a treatment?
o    Choosing a treatment that doctors know is effective for many patients
o    Considering the patient’s preferences when selecting the best medi- cal option
o    Choosing the most effective proven medical option
o    I don’t know

Now, several statements will follow.
Please indicate for each statement whether you think it is true or false.

6.    “Shared decision-making is not suitable for people who struggle to understand information about their health.”
o    True
o    False
o    I don’t know

7.    “In shared decision-making, the healthcare provider knows best what is good for me.”
o    True
o    False
o    I don’t know

8.    “In shared decision-making, the patient makes the final decision.”
o    True
o    False
o    I don’t know

9.    “In shared decision-making, ’not treating’ or ’watchful waiting’ can also be an option.”
o    True
o    False
o    I don’t know

10.    “Shared decision-making is limited to specific illnesses.”
o    True
o    False
o    I don’t know
 
11.    “Shared decision-making does not only happen in the doc- tor’s office, but can also take place on the ward.”
o    True
o    False
o    I don’t know

12.    “In shared decision-making, the healthcare provider makes decisions on behalf of the patient.”
o    True
o    False
o    I don’t know

13.    “In shared decision-making, the contribution of the patient and healthcare provider are equally valuable.”
o    True
o    False
o    I don’t know

14.    “Shared decision-making is limited for chronic illnesses.”
o    True
o    False
o    I don’t know

15.    “Shared decision-making can only involve adults and is not meant for children.”
o    True
o    False
o    I don’t know

16.    “If the patient is unable to make decisions, the family can assist in shared decision-making.”
o    True
o    False
o    I don’t know

In the following questions, you can indicate your thoughts on when shared decision-making can occur.
For each example, please indicate whether you think it is true or false.

17.    Shared decision-making can be applied if you are pregnant and want a cesarean section.
o    True
o    False
o    I don’t know

18.    Shared decision-making can take place when you need to check in at the appointment desk in the hospital.
o    True
o    False
o    I don’t know

19.    Shared decision-making can happen when your doctor rec- ommends you a specific vaccination.
o    True
o    False
o    I don’t know
 
20.    Shared decision-making can be applied with the nurse on the ward when deciding what care you will receive at home afterward.
o    True
o    False
o    I don’t know

21.    Shared decision-making can take place if the orthodontist indicates that your child needs braces.
o    True
o    False
o    I don’t know

22.    Shared decision-making can be applied when you visit the physiotherapist for an injury.
o    True
o    False
o    I don’t know

23.    Shared decision-making can happen at the pharmacy when you pick up your medication.
o    True
o    False
o    I don’t know

24.    Shared decision-making can take place if the dentist rec- ommends extracting a tooth.
o    True
o    False
o    I don’t know

End of questionnaire

Appendix B
The 9-item Shared Decision Making Questionnaire (SDM-Q-9)

Appendix C
Decision Regret Scale

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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])