hypothermia
Enable an agent to recognise and describe a suspected or confirmed hypothermia episode, assess uncertainty and urgency, and identify actions that require clinical authority.
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 or confirmed hypothermia episode, assess uncertainty and urgency, and identify actions that require clinical authority.
Hypothermia is a condition in which core body temperature falls below 35 °C, impairing physiological function as cooling progresses.
It can be Assemble a time-stamped episode account from temperature readings, exposure history and clinical observations.; Flag measurements that cannot reliably support a core-temperature interpretation.; Compare recorded evidence with a named diagnostic or staging framework and expose missing information.; Identify unresolved contributors and coexisting conditions requiring separate assessment.; Surface escalation requirements from an applicable, verified clinical protocol.; Track response to documented care and prepare an evidence-based handover..
Distinguishing features
Distinguish reduced core temperature from cold skin or reported cold discomfort by recording the measurement site, method and interpretation.
Distinguish a systemic thermal condition from local freezing injury; record their coexistence when applicable.
Distinguish hypothermia from other explanations for confusion, reduced responsiveness or collapse without treating those signs as diagnostic by themselves.
Distinguish unintended cooling from deliberately induced temperature reduction using documented intent and the supervising procedure.
Distinguish a current episode from historical exposure or resolved cooling using time-stamped physiological evidence.
Scope
+ Suspected and confirmed episodes of reduced core body temperature
+ Temperature measurements, measurement limitations and diagnostic uncertainty
+ Environmental exposure and physiological contributors to heat imbalance
+ Clinical severity, complications and changes over time
+ Rewarming context, monitoring and escalation requirements
- Frostbite and other local cold injuries as independently modelled conditions
- Cold environments, immersion events and exposure hazards themselves
- Underlying illnesses, intoxications or injuries beyond their relationship to the episode
- Thermometers, warming devices and rescue equipment as products
- Temperature-control procedures and their complete treatment protocols
- Nonhuman thermoregulation, hibernation and laboratory cooling
Characteristics
- Episode status
- suspected | confirmed | resolving | resolved | indeterminate Separates evidence of a current condition from concern, historical exposure and recovery.
- Core temperature estimate
- degrees Celsius, with timestamp, measurement site, method and uncertainty Supports recognition and trend assessment while preserving limitations of the measurement.
- Temperature measurement fitness
- method, device operating range, placement, environmental interference and validation status A reported reading may not reliably represent core temperature under the observed conditions.
- Severity assessment
- named classification system, version, assigned stage and evidence Prevents unexplained severity labels and allows disagreement between temperature and clinical staging to remain visible.
- Cooling intent
- unintended | deliberately induced | mixed or complicated | unknown Changes how the episode relates to exposure, care objectives and responsible clinical oversight.
- Thermal trajectory
- cooling | approximately stable | warming | fluctuating | unknown, over a stated interval Distinguishes the current temperature from the direction and persistence of change.
- Clinical observations
- time-stamped consciousness, shivering, breathing and circulatory observations, including unknowns Provides clinical context without assuming that any single sign determines severity.
- Exposure and contributing conditions
- links to exposure events, illnesses, substances, injuries and relevant vulnerabilities, with evidence status Connects the episode to plausible causes without presenting hypotheses as established causation.
- Care and rewarming context
- linked care setting, responsible clinician or service, interventions and applicable protocol Makes ongoing care and authority for decisions explicit.
Also called
Where this came from
wikidata · CC0 1.0
Also registered as vr.tr.hypothermia
Drafted structure
Bundle to layer to finding to question, as the second pass will find it: 6 bundles · 11 layers · 19 findings · 29 questions.
Recognition and boundaries Establish whether the recorded state represents hypothermia and which sense of cooling is involved.
Cold exposure, cold skin, local injury and intentional cooling can otherwise be conflated with the same condition.
Episode identification
Connect the proposed diagnosis to an explicit definition and episode-specific evidence.
Diagnostic basis
Record the definition being applied and whether the available evidence supports suspicion or confirmation.
- Which authoritative definition and core-temperature criterion apply to this population and setting? definition
- What measured or observed evidence supports the episode status, and what remains unavailable? measurement
Adjacent cold states
Separate systemic cooling from neighbouring conditions and procedure-governed temperature reduction.
Condition and intent boundary
Identify whether cooling is unintended, intentionally induced or accompanied by independently modelled cold injury.
- Does the evidence indicate reduced core temperature, local cold injury, cold discomfort or a combination? boundary
- Was cooling deliberately induced, and which documented procedure establishes its intended limits? provenance
Temperature evidence Represent how temperature was obtained and how confidently readings describe the episode.
Hypothermia assessment depends on measurement methods whose limitations can affect recognition and apparent recovery.
Measurement validity
Preserve measurement site, instrument limitations and conditions of acquisition.
Core temperature representation
Treat each reading as evidence with a method and uncertainty rather than as an interchangeable temperature value.
- Where, when and with which device was the reading obtained, and was that value within the device's validated range? measurement
- What supports using this measurement site and method to estimate core temperature in the present setting? provenance
Serial temperature interpretation
Assess change while accounting for differences between measurements.
Credible temperature trend
Separate plausible physiological change from changes in instruments, sites, timing or recording.
- Do successive readings demonstrate cooling, stability or warming over a specified interval? measurement
- Could a change in measurement site, device or acquisition conditions explain an apparent temperature change? boundary
Heat imbalance and contributors Describe the exposure and physiological circumstances associated with the episode.
An episode can involve multiple contributors, and environmental exposure alone may not explain the observed cooling.
Exposure history
Capture the circumstances and duration of potential heat loss.
Thermal exposure account
Record the sequence of cold, wetness, immersion, shelter and protection with explicit gaps in the history.
- What is known about ambient conditions, wetness or immersion, clothing, shelter and exposure duration? provenance
- Which potential heat-loss conditions remain active at the time of assessment? measurement
Physiological contributors
Link factors affecting heat production, thermoregulation or the ability to escape exposure.
Contributor evidence
Keep observed contributors distinct from suspected explanations and link them to their own condition models.
- Which illnesses, substances, injuries or functional limitations are documented as possible contributors? provenance
- What evidence supports each proposed contributor, and which alternative explanations remain unresolved? boundary
Clinical severity and instability Represent clinical observations, staging and potentially urgent deterioration.
A temperature value alone does not capture the full clinical state or the reliability of a severity assessment.
Severity framework
Make the chosen staging system and its evidential requirements explicit.
Supported severity assignment
Record temperature and clinical evidence alongside the classification instead of treating the assigned stage as self-explanatory.
- Which staging framework is being used, and which recorded observations support the assigned stage? definition
- Do temperature, consciousness and shivering observations disagree, or have potential confounders been identified? boundary
Physiological instability
Track breathing, circulation and responsiveness within the relevant clinical assessment framework.
Deterioration and escalation
Preserve urgent observations and connect action requirements to verified protocols and clinical responsibility.
- What time-stamped evidence describes breathing, circulation and responsiveness, and how reliable is each observation? measurement
- Which observations trigger immediate escalation under the applicable clinical protocol, and who is responsible for acting? action
Rewarming and episode resolution Track care, physiological response and the evidence needed to close or transfer the episode.
A rising temperature does not by itself establish that the episode and its associated clinical concerns have resolved.
Care response
Relate documented interventions to temperature and clinical changes without assuming causation.
Rewarming course
Record intervention timing, responsible care providers and observed response, including continued cooling or deterioration.
- Which protective or rewarming interventions were performed, when, and under whose clinical direction? provenance
- How did measured temperature and clinical observations change during and after those interventions? measurement
Resolution and handover
Establish whether the episode is ongoing, resolving or closed and preserve outstanding concerns.
Supported episode closure
Ground resolution and transfer decisions in documented criteria, remaining contributors and accountable assessment.
- Which applicable criteria and clinical assessment support marking the episode resolved? boundary
- What residual instability, exposure risk, coexisting injury or unresolved contributor must be included in handover or follow-up? 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.
- This describes the human clinical condition; species-specific temperature thresholds differ.
- Temperature bands are conventional: clinical severity also depends on consciousness, circulation and other findings, and staging systems differ.
- Guideline editions, jurisdiction-specific coding and indications for deliberately induced hypothermia require verification; no sources were consulted for this recall response.
- Which of these check these first hold for the sense of hypothermia this model covers, and on what evidence? provenance
Kinds and varieties
Recalled without web access and unsourced; every item is a lead to verify.
- Accidental hypothermia
- Primary hypothermia caused predominantly by environmental cold exposure
- Secondary hypothermia associated with illness, injury, intoxication or impaired thermoregulation
- Mild hypothermia
- Moderate hypothermia
- Severe hypothermia
- Which of these kinds and varieties hold for the sense of hypothermia 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 - T68 - WHO category for hypothermia; newborn hypothermia and hypothermia associated with anaesthesia have separate coding provisions.
- Which of these identifiers and schemes hold for the sense of hypothermia this model covers, and on what evidence? provenance
Standards and regulation
Recalled without web access and unsourced; every item is a lead to verify.
- Wilderness Medical Society clinical practice guidelines for the out-of-hospital evaluation and treatment of accidental hypothermia
- European Resuscitation Council guidelines addressing hypothermic cardiac arrest under special circumstances
- Which of these standards and regulation hold for the sense of hypothermia 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 and wilderness medicine assessment of patients exposed to cold
- Search-and-rescue triage and decisions about transport and rewarming
- Perioperative monitoring and prevention of unintended cooling
- Investigation of underlying illness or intoxication in patients with unexpectedly low body temperature
- Deliberately induced hypothermia in selected clinical settings, distinguished from accidental hypothermia
- Which of these real-world use hold for the sense of hypothermia this model covers, and on what evidence? provenance
Typical measurements
Recalled without web access and unsourced; every item is a lead to verify.
- Core body temperature defining hypothermia - <35 - °C
- Core body temperature in conventional mild hypothermia classification - 32 to <35 - °C
- Core body temperature in conventional moderate hypothermia classification - 28 to <32 - °C
- Core body temperature in conventional severe hypothermia classification - <28 - °C
- Which of these typical measurements hold for the sense of hypothermia 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.
- Progressive impairment of judgement, coordination and consciousness
- Respiratory depression and cardiovascular instability, including potentially fatal arrhythmias
- Impaired coagulation and increased bleeding risk
- Continued core cooling after removal from cold exposure, termed afterdrop
- Misclassification when peripheral temperature measurements or thermometers unsuitable for low temperatures are used
- Which of these failure modes and hazards hold for the sense of hypothermia this model covers, and on what evidence? provenance
Regional variation
Recalled without web access and unsourced; every item is a lead to verify.
- Cold climates, altitude and cold-water exposure shape environmental risk, but hypothermia also occurs indoors and in relatively mild weather.
- Clinical staging and transport pathways vary across emergency systems, particularly where reliable core temperature measurement or advanced rewarming is unavailable.
- Which of these regional variation hold for the sense of hypothermia 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.
- Frostbite - Frostbite is local tissue freezing; hypothermia is reduced core body temperature, and either can occur without the other.
- Cold stress - Cold stress can activate compensatory responses while core temperature remains at or above 35 °C.
- Non-freezing cold injury - This is local injury from prolonged cold exposure without tissue freezing and does not require systemic hypothermia.
- Therapeutic hypothermia - It describes intentional, monitored cooling for a clinical purpose rather than unintended cooling.
- Targeted temperature management - This is a clinical temperature-control strategy that can include hypothermia or maintenance of a non-hypothermic temperature.
- Which of these neighbouring kinds and how to tell them apart hold for the sense of hypothermia this model covers, and on what evidence? provenance
What the second pass must settle
- Which diagnostic definitions and staging frameworks should govern this model across adult, paediatric and neonatal populations?
- Which temperature measurement methods are sufficiently reliable in each exposure and care setting, particularly during rapid temperature change?
- How should deliberately induced cooling and unintended deviations from its target be represented without duplicating the governing procedure model?
- Which clinical observations support severity assessment when reliable core-temperature measurement is unavailable or confounded?
- Which evidence-based criteria should define episode resolution and continued monitoring requirements in different clinical settings?