Orris

Define death from FMT

Reading File
Finding Sources
Searching PubMed

"fecal microbiota transplantation" AND "death" AND "adverse events"

Searching the Web

FMT fecal microbiota transplantation "FMT-related death" definition FDA criteria

Finding Sources
Searching PubMed

"fecal microbiota transplantation" AND "FMT-related death" AND safety

Reading Web Page

https://www.cidrap.umn.edu/fecal-transplant/fda-issues-alert…

Searching the Web

"FMT-related death" definition "probably related" OR "possibly related" OR "attributable" clinical trial safety endpoint

Searching PubMed

"fecal microbiota transplantation" AND "causally related" AND mortality safety

Reading Web Page

https://openbiome.org/wp-content/uploads/2025/05/Tracking-Pa…

Searching the Web

OpenBiome OR "American Gastroenterological Association" "FMT-related death" definition causally attributable

Here is a thorough definition and breakdown of "FMT-related death" drawn from regulatory frameworks, stool bank protocols, and the published safety literature.

Definition of FMT-Related Death

An FMT-related death is a fatal outcome in which death is causally attributed - at any level of certainty - to the administration of fecal microbiota transplant material, rather than to the patient's underlying disease or other unrelated causes. It is a specific category of fatal serious adverse event (SAE) tied to the FMT procedure or product itself.

Causality Framework

Because attributing cause in sick patients is difficult, FMT-related deaths are classified along a causality spectrum, based on the WHO system for standardized case causality assessment (also adopted by OpenBiome and FMT clinical registries):
Causality GradeMeaning
DefiniteDeath and FMT are related in time, AND a direct association can be demonstrated (e.g., pathogen isolated from FMT material also found in blood cultures)
ProbableDeath and FMT are reasonably related in time, AND death is more likely explained by FMT than by other causes
PossibleDeath and FMT are reasonably related in time, AND death can be explained equally by FMT or by other causes
UnlikelyA temporal link cannot be excluded, but death is most likely explained by other causes
Not relatedTemporal relationship is absent, OR other causative factors fully explain the death
In practice, a death rated "Definite," "Probable," or "Possible" is considered an FMT-related death and triggers mandatory expedited reporting to the FDA as a Suspected Unexpected Serious Adverse Reaction (SUSAR).

Distinction from Other Deaths Post-FMT

Not all deaths after FMT are FMT-related. The FMT National Registry protocol distinguishes:
  • FMT-related death: death attributable (definite/probable/possible) to the FMT product or procedure
  • Death due to underlying disease: e.g., a CDI patient dying from progressive sepsis with no FMT-specific contribution
  • Procedurally related death: e.g., aspiration pneumonia during sedation for colonoscopic FMT delivery - this may be classified as procedure-related rather than product-related

Known Mechanisms of FMT-Related Death in the Literature

The PMC meta-analysis of FMT adverse events identified three documented cases where death was potentially attributable to FMT:
  1. Transmission of pathogens in donor stool - The most high-profile mechanism. An immunocompromised patient develops bacteremia/sepsis from organisms (e.g., ESBL-producing E. coli, EPEC, STEC, or multi-drug resistant organisms/MDROs) transmitted via inadequately screened FMT material. This was the basis for multiple FDA safety alerts.
  2. Procedure-related complications - Aspiration during sedation for colonoscopic delivery leading to fatal aspiration pneumonia.
  3. Post-FMT toxic megacolon/sepsis - Abrupt antibiotic discontinuation at time of FMT (standard practice) can unmask fulminant CDI; one reported death occurred from septic shock with toxic megacolon 3 days post-FMT.

Regulatory and Reporting Context

  • The FDA classifies a fatal outcome as a Grade 5 (Death due to event) on its adverse event severity scale.
  • Any FMT-related death that is also unexpected (not listed as a known risk in the IND/consent) must be reported to the FDA within 7 days as a SUSAR.
  • The FDA's 2019 and 2020 safety alerts specifically flagged immunocompromised patients as being at highest risk for FMT-related death from MDRO transmission.
  • Stool banks like OpenBiome now require mandatory MDRO testing of every donor batch before release, precisely to prevent FMT-related deaths.
In summary: An FMT-related death is a fatal adverse event in which causality between FMT material/procedure and the patient's death is classified as definite, probable, or possible, typically via pathogen transmission or procedural complication, and is distinct from deaths attributable solely to the patient's pre-existing disease.
This is a shared conversation. Sign in to Orris to start your own chat.