The irreversibility diagnostic procedure is the collective class of those clinical and instrument-based examinations employed within brain-death diagnostics to establish irreversible loss of brain function (ILBF). It yields a medically diagnosed irreversibility, not the ontological irreversibility of the separation of body and spiritual substance.
The procedures at a glance
The German guideline of the Federal Medical Association (Fifth Amendment 2022) and comparable international standards (UDDA guidelines, USA 2010/2023; World Brain Death Project 2020) provide for clinical and instrument-based examinations:
Clinical procedures:
- apnea test — testing the respiratory drive under standardized CO₂ elevation
- testing of the brainstem reflexes (pupillary, corneal, oculocephalic, oculovestibular, pharyngeal, tracheal reflex)
- observation intervals between the examinations (in Germany, depending on the type of injury, 12–72 h)
Instrument-based procedures:
- EEG flatline (at least 30 min)
- transcranial Doppler sonography
- cerebral angiography (CT angiography, DSA, MR angiography)
- perfusion scintigraphy (SPECT)
Epistemological limit
The irreversibility diagnostic procedures operationalize the concept of irreversibility in two ways:
- Observation period: over a fixed interval, function is tested for recurrence.
- Causal model: the demonstrated injury is connected with a model of brain function that excludes recurrence.
Both yield an inductive inference, not a deductive proof. A universal statement “the function never recurs” is, according to Popper (Popper falsification argument), not verifiable as a universal proposition but only falsifiable. Every single unexpected resuscitation or NRP finding (example: residual hypothalamic function in up to 50 percent of diagnosed cases, cf. the UDDA revision attempt 2021–2023) falsifies a prior claim of irreversibility — it cannot verify it.
Diagnostic practice thereby does not attain the ontological weight of the concept of irreversibility as it has been unfolded by Hartmann (Möglichkeit und Wirklichkeit), Jankélévitch (La mort), and Prigogine (La fin des certitudes).
Consequence for the Dead Donor Rule debate
From the difference between medically diagnosed and ontological irreversibility it follows: organ donation after brain death rests on a normative stipulation that identifies the operationalized with the ontological. The personal ontology represented here denies this identification and falls back on the precautionary principle of Benedict XVI.
Ontological classification
Superordinate concept: state of affairs (clinical-diagnostic procedure)
Subclasses:
- apnea test
- (further: brainstem-reflex testing, EEG flatline, Doppler sonography, cerebral angiography, perfusion scintigraphy)
Related to:
- medically diagnosed irreversibility
- ontological irreversibility
- Popper falsification argument
- precautionary principle
Chapter assignment: Chapter 4: What Is Human Personhood? (German), Chapter 5: Oblivion of Personhood (German)
Sources
- Federal Medical Association (Bundesärztekammer) (2022): Richtlinie zur Feststellung des irreversiblen Hirnfunktionsausfalls (Fifth Amendment).
- Greer, David M. et al. (2020): Determination of Brain Death/Death by Neurologic Criteria — The World Brain Death Project. JAMA 324(11): 1078–1097.
- Popper, Karl R. (1934): Logik der Forschung. Vienna: Springer. (English: The Logic of Scientific Discovery. London: Hutchinson, 1959.)
- Hartmann, Nicolai (1938): Möglichkeit und Wirklichkeit. Berlin: de Gruyter.
See also
- Apnea Test
- Medically Diagnosed Irreversibility
- Ontological Irreversibility
- Popper Falsification Argument
- Irreversible Loss of Brain Function
- Brain-Based Criterion of Death
- Certain Death
Generated by querying the Personhood ontology.