asphyxia
Enable an agent to recognise and describe a suspected asphyxial state, distinguish its mechanism from neighbouring conditions, track uncertainty and urgency, and identify the appropriate pathway for assessment.
Research draft, second pass
A second pass drafted this model: the structure a model of this thing needs, and what is known about it in the world. The line under this one says how the second half was obtained - researched against sources, or recalled without web access, in which case nothing here was read anywhere and every claim is a lead to verify. Unreviewed either way.
recalled by Codex without web access - no source was read
Researched by: Codex
Purpose and description
Enable an agent to recognise and describe a suspected asphyxial state, distinguish its mechanism from neighbouring conditions, track uncertainty and urgency, and identify the appropriate pathway for assessment.
Asphyxia is a condition in which impaired breathing or respiratory gas exchange deprives tissues of oxygen, often with carbon dioxide accumulation, and can cause loss of consciousness, organ injury or death.
It can be Assemble a timestamped account of a suspected asphyxial episode from observations, measurements and attributed reports.; Compare an episode with the stated criteria used in its clinical or forensic context.; Identify missing evidence and competing explanations before assigning a mechanism or conclusion.; Flag observations requiring urgent professional assessment through an applicable emergency workflow.; Track changes after documented interventions while retaining uncertainty about causation.; Link the episode to separate models of exposure, underlying disease and resulting injury..
Distinguishing features
A proposed instance must connect impaired oxygenation or gas exchange to an asphyxial mechanism under an explicitly identified definition; the label alone is insufficient.
Airway obstruction describes one possible mechanism, whereas asphyxia describes the resulting physiological condition; either should be representable without automatically asserting the other.
Absent breathing, breathlessness and low oxygen measurements are observations requiring interpretation, rather than interchangeable names for asphyxia.
An exposure such as submersion or neck compression does not, by itself, establish the occurrence, severity or outcome of an asphyxial episode.
Clinical, neonatal and forensic uses of the term must retain their respective criteria rather than being treated as equivalent classifications.
Scope
+ The operational definition used to identify an asphyxial state
+ Mechanisms interfering with breathing, gas exchange or oxygen availability
+ Evidence supporting or weakening a suspected asphyxial episode
+ Onset, persistence, recurrence and resolution of the episode
+ Immediate assessment needs and uncertainty about resulting injury
- Complete models of underlying diseases, injuries or toxic exposures
- Detailed resuscitation procedures and treatment protocols
- Hypoxia and hypercapnia occurring outside the adopted definition of asphyxia
- Long-term neurological injury and rehabilitation
- Legal determinations of intent, responsibility or manner of death
Characteristics
- Definition and assessment context
- Clinical, neonatal, forensic or other explicitly identified usage; definition source Determines which mechanisms and evidence qualify an episode as asphyxia.
- Episode assessment status
- Suspected, supported under stated criteria, indeterminate, or not supported Separates a provisional concern from an attributed conclusion.
- Suspected physiological mechanism
- Airway obstruction, restricted respiratory movement, impaired ventilation, oxygen-deficient environment, mixed mechanism, other or unknown Connects the condition to the process requiring assessment without assuming a cause from symptoms alone.
- Relevant exposure or underlying condition
- Links to observed or suspected events, environments, injuries or diseases, with attribution and confidence Keeps the asphyxial state distinct from its possible causes.
- Respiratory observations
- Observed breathing pattern, respiratory effort and airway findings, each timestamped; unknown permitted Preserves direct observations separately from an interpretation of their mechanism.
- Oxygenation measurements
- SpO2 or SaO2 in percent; PaO2 in mmHg or kPa; method, time and support conditions Provides contextual evidence without treating different measurements as interchangeable or independently diagnostic.
- Carbon dioxide and acid-base measurements
- PaCO2 in mmHg or kPa; pH unitless; specimen type and collection time Allows gas-exchange and acid-base evidence to be assessed against the adopted definition.
- Episode timing
- Onset and cessation timestamps; duration in seconds or minutes; uncertainty bounds Distinguishes witnessed timing from estimates and supports interpretation of later observations.
- Observed physiological consequences
- Links to altered consciousness, circulatory compromise or assessed organ injury, with timing and causal confidence Records consequences without making them automatic or exclusive evidence of asphyxia.
Also called
Where this came from
wikidata · CC0 1.0
Also registered as vr.tr.asphyxia
Drafted structure
Bundle to layer to finding to question, as the second pass will find it: 6 bundles · 11 layers · 19 findings · 29 questions.
Meaning and case boundaries Establishes what the term asphyxia means in this assessment and what qualifies as an instance.
A shared label can conceal different clinical and forensic inclusion criteria.
Adopted definition
Captures the definition and authority governing the assessment.
Context-specific criteria
Record the criteria actually used without presenting one disciplinary usage as universal.
- What definition of asphyxia is being applied, and which physiological features does it require? definition
- Which source or assessor supplied that definition, and for what clinical, neonatal or forensic context? provenance
Neighbouring conditions
Separates asphyxia from related observations, mechanisms and outcomes.
Hypoxia, apnoea and obstruction boundaries
Require an explicit justification for moving from a related finding to an asphyxia assessment.
- What evidence supports calling this asphyxia rather than recording hypoxia, apnoea or airway obstruction alone? boundary
- Does the adopted definition include impaired oxygen transport or utilisation, or place those processes in neighbouring models? boundary
Asphyxial mechanism Describes where and how the process supporting respiration or oxygen availability was disrupted.
The same observed deterioration can arise through different mechanisms that must not be inferred from the label.
Site of interference
Locates the suspected disruption in the respiratory process or surrounding environment.
Mechanism localisation
Distinguish obstruction, restricted respiratory movement, ventilation impairment and environmental oxygen deficiency.
- Which part of breathing, gas exchange or oxygen availability was reportedly impaired? definition
- Which observations support this mechanism, and were they directly witnessed or reconstructed? provenance
Causal chain
Connects an exposure or condition to the suspected physiological disruption.
Exposure versus established effect
Keep exposure, mechanism and resulting state as separate assertions with their own evidence.
- What evidence connects the reported exposure or underlying condition to the suspected asphyxial state? provenance
- Could multiple mechanisms or another condition account for the observations? boundary
Physiological evidence Organises respiratory observations and measurements used to assess the episode.
An asphyxia assessment must preserve how evidence was obtained and what it can establish.
Breathing and oxygenation
Records breathing observations alongside oxygenation evidence.
Timestamped respiratory evidence
Capture observed respiratory function and oxygen measurements with their acquisition conditions.
- What breathing pattern, respiratory effort and airway findings were observed, and at what times? measurement
- Which oxygenation measurements are available, by which methods, and under what oxygen or ventilatory support? measurement
Gas exchange and interpretation
Places carbon dioxide and acid-base evidence within the assessment context.
Measurement limitations
Preserve specimen details, missing evidence and limitations affecting interpretation.
- What carbon dioxide and pH results exist, with specimen type, units and collection time? measurement
- Which measurement limitations, prior interventions or competing conditions affect what these results establish? boundary
Episode course and consequences Tracks the suspected episode through onset, progression, cessation and subsequent assessment.
A later observation cannot fully describe an earlier episode, and episode resolution must be distinguished from assessment of injury.
Episode timeline
Reconstructs timing while retaining gaps and uncertainty.
Onset, duration and recurrence
Represent witnessed and estimated intervals separately.
- When was the person last observed without the suspected impairment, and when was impairment first observed? measurement
- What supports the estimated duration, cessation or recurrence of the episode? provenance
Recovery and injury
Separates changes in respiratory state from attributed downstream harm.
Consequence attribution
Record observed recovery and assessed consequences without assuming either from a single later measurement.
- What observations support ongoing impairment or resolution of the suspected asphyxial state? measurement
- Which neurological, circulatory or other consequences were assessed, and how securely are they attributed to this episode? provenance
Assessment and response Connects uncertainty and observed condition to appropriate assessment, escalation and reassessment.
The model must support action without converting incomplete evidence into a diagnosis or embedding a universal treatment protocol.
Urgent assessment
Identifies whether an active event needs an applicable emergency response pathway.
Current condition and response pathway
Distinguish an active suspected event from retrospective documentation and identify the responsible assessment pathway.
- Is this an active suspected episode, a resolved event awaiting assessment or a retrospective investigation? boundary
- Which applicable emergency or clinical workflow should receive the current observations and suspected mechanism? action
Intervention and reassessment
Records actions taken and the evidence used to revise the episode assessment.
Documented response and revision
Connect interventions to subsequent observations without assuming that improvement proves the proposed mechanism.
- What interventions were documented, by whom and when, relative to subsequent observations? provenance
- What additional assessment is needed to revise the suspected mechanism, episode status or consequences? action
Evidence and external alignment What the world already says about this thing, gathered so the model can be checked against it.
A model that cannot be lined up against existing standards, identifiers and practice cannot be adopted by anyone who already uses them.
Reported evidence
Findings from the breadth pass, kept separate from the structural claims.
Check these first
Recalled without web access and unsourced; every item is a lead to verify.
- Asphyxia is a physiological and clinical condition despite its placement in the batch's abstract-concept context.
- Clinical, forensic and toxicological usage differs, especially regarding chemical asphyxiants and mechanisms involving impaired oxygen utilization.
- Perinatal diagnostic criteria and jurisdiction-specific coding should be checked; these statements are recalled knowledge, not researched findings.
- Which of these check these first hold for the sense of asphyxia this model covers, and on what evidence? provenance
Kinds and varieties
Recalled without web access and unsourced; every item is a lead to verify.
- Asphyxia from airway obstruction
- Asphyxia from strangulation
- Asphyxia from chest compression
- Positional asphyxia
- Asphyxia in an oxygen-deficient atmosphere
- Perinatal asphyxia
- Which of these kinds and varieties hold for the sense of asphyxia this model covers, and on what evidence? provenance
Identifiers and schemes
Recalled without web access and unsourced; every item is a lead to verify.
- ICD-10 - T71 - WHO category for asphyxiation; it does not encompass every condition described as asphyxia, and national modifications add detail.
- ICD-10 - P21 - WHO category for birth asphyxia, distinguished from other forms.
- Which of these identifiers and schemes hold for the sense of asphyxia this model covers, and on what evidence? provenance
Standards and regulation
Recalled without web access and unsourced; every item is a lead to verify.
- OSHA standard 29 CFR 1910.146 addresses permit-required confined spaces, including oxygen-deficient atmospheres.
- Which of these standards and regulation hold for the sense of asphyxia this model covers, and on what evidence? provenance
Real-world use
Recalled without web access and unsourced; every item is a lead to verify.
- Emergency assessment of oxygen deprivation associated with impaired breathing.
- Forensic investigation of deaths involving obstruction, neck compression or other interference with respiration.
- Occupational risk assessment for confined spaces and oxygen-displacing gases.
- Assessment of oxygen deprivation around birth.
- Which of these real-world use hold for the sense of asphyxia this model covers, and on what evidence? provenance
Typical measurements
Recalled without web access and unsourced; every item is a lead to verify.
- Oxygen concentration in workplace air - Below 19.5 is classified by OSHA as oxygen-deficient; this is a workplace threshold, not a diagnostic threshold for asphyxia. - % by volume
- Which of these typical measurements hold for the sense of asphyxia this model covers, and on what evidence? provenance
Failure modes and hazards
Recalled without web access and unsourced; every item is a lead to verify.
- Rapid loss of consciousness can prevent escape or self-rescue.
- Prolonged oxygen deprivation can cause irreversible brain injury.
- Severe asphyxia can progress to cardiac arrest and death.
- An oxygen-deficient atmosphere may incapacitate rescuers entering without appropriate protection.
- External injuries may be absent or nonspecific, complicating forensic interpretation.
- Which of these failure modes and hazards hold for the sense of asphyxia this model covers, and on what evidence? provenance
Regional variation
Recalled without web access and unsourced; every item is a lead to verify.
- National modifications of ICD-10 differ in coding detail and requirements.
- Occupational definitions and legal requirements for oxygen-deficient environments vary by jurisdiction.
- Which of these regional variation hold for the sense of asphyxia this model covers, and on what evidence? provenance
Neighbouring kinds and how to tell them apart
Recalled without web access and unsourced; every item is a lead to verify.
- Hypoxia - Hypoxia means inadequate tissue oxygenation from any cause; asphyxia describes a process involving impaired respiration or oxygen availability.
- Hypoxemia - Hypoxemia is low oxygen in arterial blood; it is a physiological finding rather than a synonym for asphyxia.
- Choking - Choking is airway obstruction, usually by foreign material, and is one possible cause of asphyxia.
- Strangulation - Strangulation is external neck compression and can impair cerebral blood flow as well as breathing.
- Drowning - Drowning is respiratory impairment from submersion or immersion in liquid and has its own clinical and epidemiological definition.
- Respiratory failure - Respiratory failure is inadequate oxygenation or carbon dioxide elimination from many possible diseases or injuries; its scope overlaps with but is not identical to asphyxia.
- Which of these neighbouring kinds and how to tell them apart hold for the sense of asphyxia this model covers, and on what evidence? provenance
What the second pass must settle
- Which authoritative definitions should govern general, neonatal and forensic uses of asphyxia, and where do their inclusion criteria differ?
- Should toxic impairment of oxygen transport or utilisation fall within this registry entry, or be represented only through links to poisoning and hypoxia models?
- How should neck compression involving both respiratory and vascular mechanisms be represented without obscuring either mechanism?
- Which evidence supports grading episode severity when onset, duration or measurements before intervention are unavailable?
- Does an existing Vercy world model already cover this concept and therefore require this registry entry to link to it instead of creating a separate publication?