Statement of Principles concerning immersion pulmonary oedema (Reasonable Hypothesis) (No. 34 of 2017)

The instrument’s core concepts are defined and constrained in Schedule 1 and in the substantive clauses. The operative medical condition is immersion pulmonary oedema. The instrument defines that term as a condition in which acute pulmonary oedema develops while swimming or diving, and it expressly excludes acute pulmonary oedema attributed to pulmonary decompression sickness, acute myocardial infarction, or an acute exacerbation of chronic heart failure (s 6(2)). The instrument also provides a clinical note that immersion pulmonary oedema typically presents with breathlessness, cough, haemoptysis, pink frothy sputum and hypoxaemia (s 6(2) note).

Death from immersion pulmonary oedema is treated as including deaths where a terminal event or condition was contributed to by the person’s immersion pulmonary oedema (s 6(3)). The instrument gives an enumerated, non‑exhaustive list of examples of terminal events in Schedule 1: pneumonia, respiratory failure, cardiac arrest, circulatory failure, cessation of brain function (Schedule 1: terminal event).

The statutory threshold used by the instrument is the "reasonable hypothesis" standard. Section 8 prescribes the factual factors that must as a minimum exist for a reasonable hypothesis to be raised connecting the condition or death to relevant service. Those factors are limited and expressed in the disjunctive: (1) undertaking swimming or underwater diving at the time of the clinical onset of immersion pulmonary oedema; or (2) inability to obtain appropriate clinical management for immersion pulmonary oedema (s 8). Section 9 requires that the existence of any such factor must be related to the person's relevant service (s 9(1)), and it restricts the operation of factor 8(2) so that it "applies only to material contribution to, or aggravation of, immersion pulmonary oedema where the person's immersion pulmonary oedema was suffered or contracted before or during (but did not arise out of) the person's relevant service" (s 9(2)).

The instrument situates itself within the statutory system for SOPs by stating that if any factor in s 8 refers to an injury or disease covered by another SOP determined under subsection 196B(2) of the VEA, then the factors in that other SOP apply in accordance with its terms as in force from time to time (s 10). The instrument also sets out the statutory categories of "relevant service" in Schedule 1: operational, peacekeeping, hazardous and British nuclear test defence service under the VEA; and warlike and non‑warlike service under the MRCA (Schedule 1: relevant service).

Finally, s 7 records the RMA’s view that there is sound medical‑scientific evidence that indicates immersion pulmonary oedema and related death can be related to relevant service , the instrument records that view as the basis for determining the factors in the SOP (s 7). That statement is the RMA’s evidential basis as recorded in the instrument; the text does not reproduce or attach the underlying studies or data.

The instrument affects three categories of actors principally: claimants (veterans and former members), decision‑makers assessing claims under the VEA and MRCA, and advisers (medical practitioners and representatives preparing evidence for claims).

Claimants: The instrument applies to claims to which section 120A of the VEA or section 338 of the MRCA applies (s 4). The Schedule defines "relevant service" to include operational service, peacekeeping service, hazardous service, British nuclear test defence service under the VEA, and warlike or non‑warlike service under the MRCA (Schedule 1: relevant service). Therefore, veterans and other persons whose claims fall within those statutory categories and who assert immersion pulmonary oedema or death from it as service‑related are affected. For death claims, the definition of death from immersion pulmonary oedema includes death from a terminal event that the immersion pulmonary oedema contributed to (s 6(3) and Schedule 1: terminal event), so estates and dependants who bring death claims are also within scope.

Decision‑makers: Administrative decision‑makers responsible for assessing entitlements under the VEA or MRCA rely on SOPs to determine whether a reasonable hypothesis exists linking an injury or disease to relevant service. The instrument prescribes the minimum factors that must exist to raise such a reasonable hypothesis for immersion pulmonary oedema (s 8). Those decision‑makers therefore must apply the factors and definitions in this SOP when assessing claims within the statutory sections referenced (s 4).

Medical and allied practitioners: To establish the factors identified in s 8, claimants will typically need contemporaneous clinical records or expert medical reports confirming the clinical onset while swimming/diving, the diagnosis of acute pulmonary oedema, whether excluded causes are present, and whether appropriate clinical management was available or obtained. The SOP sets the clinical boundaries: immersion pulmonary oedema must be acute pulmonary oedema developing while swimming or diving and must not be attributed to specified excluded causes (s 6(2)). Medical practitioners producing reports or providing evidence for claims will need to address these definitional and exclusionary points.

Other SOPs and existing SOP frameworks: Where a factor in s 8 refers to another injury or disease covered by a different SOP, the other SOP applies as in force (s 10). That means practitioners and decision‑makers must consider the universe of SOPs and apply the relevant texts where cross‑references occur.

Organisational actors: The Repatriation Medical Authority is the maker of the instrument (s 3). The instrument is sealed and recorded as an RMA determination (front matter, signature). No enforcement agency or penalty regime is created by this SOP; its effect is administrative within the VEA/MRCA claim processes.

This SOP creates no statutory duty to act, criminal offence, or administrative penalty. Instead it establishes evidentiary and causal thresholds used in the rights‑determination process for particular kinds of VEA/MRCA claims. The rights and duties it practically creates are administrative and evidentiary in nature.

Right to have a "reasonable hypothesis" considered: For claimants alleging immersion pulmonary oedema or death resulting from it, the SOP prescribes the minimum factual circumstances that must exist to raise a reasonable hypothesis connecting the condition or death to relevant service (s 8). If at least one of the factors in s 8 exists and is related to the person’s relevant service (s 9(1)), then a decision‑maker may be obliged, under the processes of the VEA/MRCA, to treat the condition as potentially service‑related for further consideration under the substantive entitlements provisions referenced in s 4. The SOP therefore frames the claimant’s right to have the claim proceed past threshold where the SOP’s factors are satisfied.

Duty of decision‑makers to use the instrument in claims covered by s 120A VEA or s 338 MRCA: The instrument applies to claims to which those sections apply (s 4). While the SOP text does not itself restate the procedural obligations of decision‑makers under the VEA or MRCA, it is designed to be applied by them when assessing whether the requisite reasonable hypothesis has been raised. The RMA's stated basis for the determination (s 7) is that there is sound medical‑scientific evidence that the condition can be related to relevant service; that claim is the RMA's justification for prescribing the factors.

Requirement of relation to relevant service: Any factor identified in s 8 must be related to the person’s relevant service rendered (s 9(1)). This places a relationship requirement on the factual circumstances relied upon by a claimant; establishing that a factor existed in isolation is not sufficient without establishing the connection to relevant service.

Limit on the second factor’s operation: The factor in s 8(2) (inability to obtain appropriate clinical management) is limited by s 9(2). It applies only to claims of material contribution to, or aggravation of, immersion pulmonary oedema where the individual's immersion pulmonary oedema was suffered or contracted before or during (but did not arise out of) the person's relevant service. Practically, that means inability to obtain appropriate clinical management cannot be used under this instrument to establish a causal connection where the condition first arose as having arisen out of relevant service; it only operates to address cases where the condition pre‑existed or was contracted before/during service and the lack of care during relevant service materially contributed to or aggravated the condition (s 9(2)).

Interaction with other SOPs: If a factor in s 8 refers to an injury or disease already covered by another SOP determined under s 196B(2) of the VEA, the practitioner/decision‑maker must apply the factors in that other SOP as in force from time to time (s 10). That creates a duty to track and apply the relevant SOP corpus.

No penal powers or enforcement mechanism in the instrument: The SOP itself contains no enforcement provisions, offences, or penalties. Its function is to guide administrative causation assessments; the instrument does not instruct compliance duties for third parties beyond the evidentiary application in claims and does not create independent rights to remedies outside the VEA/MRCA framework.

The Statement of Principles instrument contains no provisions creating penalties, criminal offences, pecuniary fines, or specific enforcement mechanisms. The text confines itself to definitions, causation factors, and the scope of application (s 1-s 10 and Schedule 1). There is no clause imposing sanctions for non‑compliance, no administrative enforcement regime established in the instrument, and no delegated power to issue notices, directions, or compliance orders. The instrument is silent on investigative powers or sanctioning mechanisms.

Enforcement in practice is therefore indirect and administrative. The SOP is intended to be used by decision‑makers applying the VEA and MRCA statutory frameworks; any consequences for a claimant or an applicant arise from the determinations made in those statutory processes (for example, acceptance or rejection of a claim, or acceptance of service connection for an injury/disease). The instrument does not itself create a private cause of action or civil remedy; nor does it specify compensation levels, rehabilitation entitlements, or review mechanisms. The RMA has recorded the "sound medical‑scientific evidence" basis for its determination (s 7), but the instrument does not attach evidentiary or disclosure requirements beyond prescribing the factual factors that must be shown to raise a reasonable hypothesis (s 8).

Because the instrument operates as an SOP within the VEA/MRCA scheme, the enforcement and penalty context for parties will be determined by the procedural and review provisions of those Acts, which are referenced as the statutory loci of application in s 4. The SOP does not detail appeal, merits review, or judicial review processes. The instrument likewise contains no time limits for when a claim must be made; commencement and date of instrument are provided (s 2 and front matter) but no limitation provisions are included.

This instrument is expressly made under subsection 196B(2) of the VEA (s 3), and it applies to claims to which section 120A of the VEA or section 338 of the MRCA applies (s 4). Accordingly, it is not freestanding law but part of the statutory SOP ecosystem that informs the administration and adjudication of claims under those statutes. The SOP therefore operates as a statutory interpretive and evidentiary tool to be applied within the VEA/MRCA decision‑making processes; it does not replace or amend the substantive entitlements provisions of those Acts.

Cross‑application to other SOPs: Section 10 contains an express nexus to other SOPs determined under subsection 196B(2) of the VEA. If a factor in section 8 refers to an injury or disease already the subject of another SOP, then the factors in that other SOP apply in accordance with its terms as in force from time to time (s 10). That creates a hierarchy of application in any claim where multiple SOPs intersect: decision‑makers must read the present instrument alongside other relevant SOPs and apply the latter where cross‑references occur. The instrument does not prescribe an order of precedence beyond that textual direction.

Definitions and statutory terms: The instrument imports statutory terminology and anchors its scope to the statutory categories of "relevant service" as defined in Schedule 1 (operational, peacekeeping, hazardous, British nuclear test defence service under the VEA; warlike and non‑warlike service under the MRCA). It also defines "terminal event" for the purposes of death claims (Schedule 1). The instrument therefore interacts with the VEA and MRCA where those statutory categories determine eligibility to make claims or the legal character of the service being claimed.

Exclusions that affect interaction with other statutory causes: The instrument excludes acute pulmonary oedema attributed to pulmonary decompression sickness, acute myocardial infarction, or an acute exacerbation of chronic heart failure from the definition of immersion pulmonary oedema (s 6(2)(b)). This exclusionary language requires decision‑makers to distinguish immersion pulmonary oedema claims from claims that are, by medical attribution, better characterised under other conditions which may themselves be covered by separate SOPs or different statutory provisions. If such excluded conditions are present, the present SOP will not apply to describe immersion pulmonary oedema for that person; the decision‑maker will need to consider whether the claim falls within the terms of other SOPs or other provisions of the VEA/MRCA.

Application in death claims: Section 6(3) extends the SOP to death from immersion pulmonary oedema, including deaths where a terminal event was contributed to by immersion pulmonary oedema. This affects how death claims are evaluated within the VEA/MRCA frameworks: death need not be directly from pulmonary oedema clinically; it is within this SOP if a terminal event listed in Schedule 1 (for example, pneumonia, respiratory failure) was contributed to by immersion pulmonary oedema.

Temporal and evidentiary interactions: The SOP commences on 22 May 2017 (s 2). The instrument does not contain retrospective or prospective transitional provisions in the text provided; therefore practitioners must apply it in accordance with the statutes that reference SOPs and any guidance those statutes or decision‑makers provide as to temporal operation. The instrument does not stipulate how it should be applied to claims arising from incidents before or after commencement, nor does it provide transitional amendment rules; the statutory framework into which it is inserted (VEA/MRCA) will control those outcomes outside the SOP text itself.

The document provided is a single instrument: Statement of Principles concerning immersion pulmonary oedema (Reasonable Hypothesis) (No. 34 of 2017). The front matter records it as No. 34 of 2017 and dated 21 April 2017. Section 2 records that the instrument commences on 22 May 2017. Section 3 states the instrument is made under subsection 196B(2) of the Veterans' Entitlements Act 1986. The Schedule 1 dictionary, the clauses 1-10, and the signature page accompany the instrument as promulgated.

No subsequent amendments, revocations, or replacement instruments are recorded in the text provided. The instrument itself contains a mechanism that contemplates change by cross‑reference to other Statements of Principles: s 10 instructs that if a factor in this SOP refers to an injury or disease covered by another SOP determined under subsection 196B(2) of the VEA, then the factors in that other SOP apply as in force from time to time. This implies that the body of SOPs is intended to be dynamic and that any changes to other SOPs may affect the application of this SOP where cross‑references exist (s 10), but the instrument does not record or list amendments to this instrument itself.

Practically, the document as presented should be treated as the operative version effective from 22 May 2017 unless the administering agency publishes later amending instruments or revocations. The SOP does not include any schedule of prior instruments or an amendment history within its text. The RMA's signature and sealing on the instrument (front matter) indicate the formality of determination, but no later changes are recorded here. Users of this SOP should check the authoritative RMA or VEA/MRCA instrument registers for any subsequent amendments, but the text provided contains no amendment entries.

The text of this SOP does not record any litigation history. There are no judicial decisions, tribunal determinations, or administrative appeal outcomes included or referenced in the instrument. The instrument itself is an administrative determination by the Repatriation Medical Authority under subsection 196B(2) of the VEA (s 3), but the instrument content does not disclose whether its application has been the subject of litigation or merits review.

Because the SOP is an evidentiary and causation instrument used within the VEA/MRCA claims system, litigation or merits review challenging decisions that rely on this SOP would, if any exist, be found in case law or tribunal records outside the text of the instrument. The instrument does not summarise or purport to catalogue such decisions. Accordingly, from the present source text there are no named cases, no recorded judicial pronouncements, and no litigation chronology to report.

Practitioners seeking to know whether this SOP has been interpreted, endorsed, or rejected by courts or tribunals must therefore consult external judicial and tribunal records. The instrument contains no constraints or guidance about judicial review, and it does not itself establish binding precedent of a judicial kind; its legal force is as a statutory SOP for administrative decision‑makers under the VEA/MRCA framework. The absence of litigation history in the SOP text means that any statements about how courts or tribunals have treated this specific instrument would be outside the authority of this document and are not contained herein.

A number of concrete, text‑based traps and narrow points in this instrument can affect how a claim is framed and assessed.

Narrow clinical definition and explicit exclusions: The definition of immersion pulmonary oedema is tightly framed: it is acute pulmonary oedema that develops while swimming or diving (s 6(2)(a)). The instrument expressly excludes acute pulmonary oedema attributed to pulmonary decompression sickness, acute myocardial infarction, or an acute exacerbation of chronic heart failure (s 6(2)(b)). If a claimant’s clinical record attributes the acute pulmonary oedema to any of those excluded causes, this SOP does not describe the condition for that person and the decision‑maker must consider whether a different SOP or a different statutory provision applies. The instrument’s note that immersion pulmonary oedema "typically presents" with specified symptoms is clinical guidance only (s 6(2) note) and does not alter the text‑based exclusion list.

Disjunctive and minimal factors: Section 8 sets out two discrete factors, and only one of them must exist to raise a reasonable hypothesis (s 8). That minimal threshold is procedural in character. The first factor requires the clinical onset to have occurred while the person was undertaking swimming or underwater diving (s 8(1)). Practically, the timing and circumstances of clinical onset are material and may require contemporaneous or precise evidence. The second factor is inability to obtain appropriate clinical management for immersion pulmonary oedema (s 8(2)), but that factor is subject to the limitation in s 9(2) (see below).

Limitation on the clinical‑management factor: Section 9(2) materially narrows the application of s 8(2). It applies only to material contribution to, or aggravation of, immersion pulmonary oedema where the person's immersion pulmonary oedema was suffered or contracted before or during (but did not arise out of) the person's relevant service (s 9(2)). That wording can catch claimants who assert that the lack of appropriate care during service made a pre‑existing or concurrently contracted condition worse or materially contributed to its course. Conversely, it excludes using inability to obtain appropriate clinical management under this instrument where the immersion pulmonary oedema itself arose out of relevant service. Practitioners need to align pleadings and medical evidence to this temporal and causal framing.

Death claims: Section 6(3) includes death from a terminal event or condition contributed to by immersion pulmonary oedema. The Schedule defines "terminal event" with examples (pneumonia, respiratory failure, cardiac arrest, circulatory failure, cessation of brain function) (Schedule 1). For death claims, it is therefore not necessary for death to be recorded as directly due to pulmonary oedema; a contribution by immersion pulmonary oedema to a terminal event within the Schedule's scope brings the death within the SOP. Practitioners must explicitly link immersion pulmonary oedema to the terminal event in medical evidence.

Cross‑referencing SOPs: Section 10 requires the application of other SOPs if a factor in s 8 refers to an injury or disease covered by another SOP determined under subsection 196B(2) of the VEA. This means evidence or arguments invoking other conditions must be tied to the relevant SOP texts; failure to do so can lead to misapplied causation reasoning.

No procedural or evidentiary detail: The SOP prescribes factors but does not specify how evidence should be presented, what standard of medical proof is required beyond the "reasonable hypothesis" standard, or what documentary form that evidence must take. Practitioners must therefore ensure that medical records, witness statements and expert reports explicitly address the textual elements of the SOP (for example, onset during swimming/diving, exclusion of listed causes, timing relative to relevant service for s 9(2)) because the instrument itself gives no supplemental evidentiary guidance.

Ambiguities in "undertaking swimming or underwater diving": The text requires "undertaking swimming or underwater diving at the time of the clinical onset" (s 8(1)). The instrument does not define the boundaries of "undertaking" (for example, training, recreational activity, preparatory immersion, or surface intervals). That factual ambiguity can be determinative and will rest on the documentary record; absence of direct contemporaneous evidence about timing may be critical.

Scope limited to specific statutory claims: The SOP applies only to claims to which s 120A VEA or s 338 MRCA applies (s 4). The instrument contains no general application beyond those statutory contexts. Practitioners should not assume its factors are applicable in other administrative or civil contexts without reference to the governing statute.

No penalties or enforcement mechanisms in the text: There is no mechanism in the instrument to compel provision of records or attendance at examinations. The SOP therefore relies on the procedural provisions of the VEA/MRCA and the cooperation of parties and medical providers to assemble the evidence necessary to meet its factors.

For practitioners preparing claims or advising claimants about immersion pulmonary oedema under the VEA/MRCA framework, compliance with this SOP means aligning the factual and medical evidence with the textual requirements of the instrument.

1. Identify that the claim falls within the SOP’s application: confirm that the claim is one to which section 120A of the VEA or section 338 of the MRCA applies (s 4). Also confirm the claimant’s service type meets a Schedule 1 definition of relevant service (operational, peacekeeping, hazardous, British nuclear test defence service under the VEA; warlike or non‑warlike service under the MRCA) (Schedule 1: relevant service).

2. Satisfy at least one factor in s 8: prepare evidence to establish either s 8(1) or s 8(2).

   • For s 8(1) (clinical onset during swimming or underwater diving): obtain and collate contemporaneous clinical notes, incident reports, witness statements, dive logs, swimming/diving activity logs, emergency service records or hospital admission records that document the timing of symptom onset relative to the act of swimming or underwater diving. Medical records should specify the clinical onset and diagnosis of acute pulmonary oedema.

   • For s 8(2) (inability to obtain appropriate clinical management): document the circumstances that led to inability to obtain appropriate clinical management. Hospital and referral records, communications with medical services, service unit records, or other contemporaneous documentation are relevant. Demonstrate how lack of management occurred and its temporal relation to the condition.

3. Meet the relation‑to‑service requirement (s 9): ensure the factor shown is directly related to the claimant’s relevant service (s 9(1)). Where relying on s 8(2), ensure that the condition was suffered or contracted before or during (but did not arise out of) the person’s relevant service if asserting material contribution or aggravation (s 9(2)). Medical evidence should address whether the immersion pulmonary oedema arose out of service or pre‑existed, and whether the lack of care during service materially contributed or aggravated the condition as required by s 9(2).

4. Exclude other causal attributions per s 6(2)(b): ensure medical opinions explicitly consider and exclude the conditions listed in s 6(2)(b) , pulmonary decompression sickness, acute myocardial infarction, and an acute exacerbation of chronic heart failure , where reliance is placed on the immersion pulmonary oedema diagnosis. If records attribute the pulmonary oedema to an excluded cause, the SOP will not apply; alternative SOPs or claims pathways may be relevant.

5. For death claims, link terminal events (s 6(3) and Schedule 1): when the claim is for death from immersion pulmonary oedema, obtain the death certificate, autopsy or post‑mortem reports, and medical opinions that link the immersion pulmonary oedema to the terminal event. The Schedule lists examples of terminal events; a practitioner should ensure medical evidence addresses how immersion pulmonary oedema contributed to the listed terminal event.

6. Where cross‑referenced conditions arise, apply other SOPs (s 10): if any factor invokes another injury or disease covered by a different SOP, identify that SOP and ensure the evidence meets the factors set out in it. The instrument requires that those other SOPs be applied as in force from time to time (s 10).

7. Present evidence aligned to the "reasonable hypothesis" threshold: the SOP establishes minimal factors for a reasonable hypothesis; medical reports should be framed to show how the SOP’s textual criteria are met to raise such a hypothesis rather than attempting to prove service causation on a balance of probabilities in the SOP document itself. Decision‑makers will apply the SOP within the statutory claim processes.

8. Record dates and chronology precisely: because timing is central , onset during swimming/diving (s 8(1)), whether the condition was suffered/contracted before or during service (s 9(2)) , provide a clear chronology of events supported by contemporaneous records where possible.

9. Keep the SOP in force and commencement date in mind: the instrument commenced on 22 May 2017 (s 2); ensure any claim strategy notes the operative date and any relevant administrative guidance about retrospective application under the VEA/MRCA framework (the instrument itself contains no transitional rules).

10. Liaise with treating clinicians to obtain specific commentary: medical practitioners preparing reports should be asked to address explicitly the elements of the SOP: the precise onset circumstances, the diagnostic basis for acute pulmonary oedema, exclusion or inclusion of the specified excluded causes (s 6(2)(b)), whether inability to obtain appropriate clinical management occurred and, if relied on, how it materially contributed or aggravated the condition in the terms of s 9(2).

These steps are derived directly from the instrument’s text (s 4-s 10 and Schedule 1). The SOP does not prescribe procedural forms, timeframes, or evidentiary thresholds beyond the factors identified; practitioners must therefore ensure that available documentary, medical and witness material map closely to the SOP language so decision‑makers can apply it to the claim under the governing VEA or MRCA provisions.