Evidence map›Paper›PMID 31428836›Full record

SynthesisWorld journal of surgery2019

A Systematic Review of Opt-out Versus Opt-in Consent on Deceased Organ Donation and Transplantation (2006-2016).

M Usman Ahmad, Afif Hanna, Ahmed-Zayn Mohamed, Alex Schlindwein, Caitlin Pley, Ingrid Bahner, Rahul Mhaskar, Gavin J Pettigrew, Tambi Jarmi

Abstract readComparative StudySystematic Review
PubMed Publisher
In one paragraph

Synthesis in World journal of surgery, 2019. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 39 papers, 1 of them a synthesis that pooled it.

0numbers the graph read from it
0cells of the map it votes in
39citing papers in PubMed, 1 pooled it
–field-weighted citation impact
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

39 citing papers in PubMed, 1 synthesis or guideline pooled it.

  1. Pooled it
  2. Review
  3. Skin cancer detection and organ donation.Journal of the European Academy of Dermatology and Venereology : JEADV · 2026
    Article
  4. Does opt-out legislation crowd out living organ donations? A cross-country study.The European journal of health economics : HEPAC : health economics in prevention and care · 2026
    Article
  5. Article
  6. Article
  7. Article
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  10. Early experiences of deemed consent legislation for organ donation in Nova Scotia: a qualitative study.Canadian journal of anaesthesia = Journal canadien d'anesthesie · 2024
    Article
  11. Review
  12. Article
  13. Article
  14. Article
  15. Article
  16. Article
  17. Review
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4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

9 authors.

M Usman AhmadMedical Edu., USF Morsani College of Medicine (MCOM), 12901 Bruce B Downs Blvd, Tampa, FL, USA. musman.ahmad@cuanschutz.edu.
Afif HannaMedical Edu., USF Morsani College of Medicine (MCOM), 12901 Bruce B Downs Blvd, Tampa, FL, USA.
Ahmed-Zayn MohamedMedical Edu., USF Morsani College of Medicine (MCOM), 12901 Bruce B Downs Blvd, Tampa, FL, USA.
Alex SchlindweinMedical Edu., University of Cambridge School of Medicine, Cambridge, UK.
Caitlin PleyMedical Edu., University of Cambridge School of Medicine, Cambridge, UK.
Ingrid BahnerDepartment of Molecular Med, USF MCOM, 12901 Bruce B Downs Blvd MDC 7, Tampa, FL, USA.
Rahul MhaskarOffice of Research, USF MCOM, 12901 Bruce B Downs Blvd MDC 27, Tampa, FL, USA.
Gavin J PettigrewDepartment of Surgery, Addenbrooke's Hospital, University of Cambridge, Cambridge, UK.
Tambi JarmiDepartment of Internal Medicine, USF MCOM, 12901 Bruce B Downs Blvd, Tampa, FL, USA.

Funding

Morsani College of Medicine SELECT MD Summer Immersion Grant
6 · The paper itself

Abstract

backgroundSignificant numbers of patients in the USA and UK die while waiting for solid organ transplant. Only 1-2% of deaths are eligible as donors with a fraction of the deceased donating organs. The form of consent to donation may affect the organs available. Forms of consent include: opt-in, mandated choice, opt-out, and organ conscription. Opt-in and opt-out are commonly practiced. A systematic review was conducted to determine the effect of opt-in versus opt-out consent on the deceased donation rate (DDR) and deceased transplantation rate (DTR).

methodsLiterature searches of PubMed and EMBASE between 2006 and 2016 were performed. Research studies were selected based on certain inclusion criteria which include USA, UK, and Spain; compare opt-in versus opt-out; primary data analysis; and reported DDR or DTR. Modeled effect on US transplant activity was conducted using public data from Organ Procurement and Transplantation Network and Centers for Disease Control WONDER from 2006 to 2015.

resultsA total of 2400 studies were screened and six studies were included. Four studies reported opt-out consent increases DDR by 21-76% over 5-14 years. These studies compared 13-25 opt-out countries versus 9-23 opt-in countries. Three studies reported opt-out consent increases DTR by 38-83% over 11-13 years. These studies compared 22-25 opt-out versus 22-28 opt-in countries. Modeled opt-out activity on the USA resulted in 4753-17,201 additional transplants annually.

conclusionOpt-out consent increases DDR and DTR and may be useful in decreasing deaths on the waiting list in the USA and other countries. REGISTRATION NUMBER: PROSPERO CRD42019098759.

Indexed as

Informed ConsentOrgan TransplantationTissue and Organ ProcurementHumansWaiting Lists

Identifiers

What OpenQuestion holds

Textmetadata
Read underepoch 390

Registered trials

None linked

Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.