Microscopic polyangiitis
Meaning of microscopic polyangiitis: For the purposes of this Statement of Principles, microscopic polyangiitis: (a) means a necrotising non-granulomatous vasculitis with few or no immune deposits predominantly affecting small vessels (capillaries, venules or arterioles); and (b) excludes polyarteritis nodosa, granulomatosis with polyangiitis (Wegener granulomatosis) and eosinophilic granulomatosis with polyangiitis (Churg-Strauss syndrome).
Reasonable Hypothesis (RH) — Statement of Principles No. 90 of 2019
At least one of the following factors must as a minimum exist before it can be said that a reasonable hypothesis has been raised connecting microscopic polyangiitis or death from microscopic polyangiitis with the circumstances of a person's relevant service:
- (1)inhaling respirable crystalline silica dust, at the time material containing crystalline silica was being: (a) produced; (b) excavated; (c) drilled, cut or ground; or (d) used in construction, manufacturing, cleaning or blasting; for a cumulative period of at least 2 500 hours before the clinical onset of microscopic polyangiitis;
- (2)having silicosis at the time of the clinical onset of microscopic polyangiitis;
- (3)being treated with a drug from the specified list of drugs at the time of the clinical onset of microscopic polyangiitis;
Note: specified list of drugs is defined in the Schedule 1 - Dictionary.
- (4)inhaling respirable crystalline silica dust, at the time material containing crystalline silica was being: (a) produced; (b) excavated; (c) drilled, cut or ground; or (d) used in construction, manufacturing, cleaning or blasting; for a cumulative period of at least 2 500 hours before the clinical worsening of microscopic polyangiitis;
- (5)having silicosis at the time of the clinical worsening of microscopic polyangiitis;
- (6)being treated with a drug from the specified list of drugs at the time of the clinical worsening of microscopic polyangiitis;
Note: specified list of drugs is defined in the Schedule 1 - Dictionary.
- (7)inability to obtain appropriate clinical management for microscopic polyangiitis;
Aggravation-only factors: the factors in subsections 9(4) to 9(7) apply only to material contribution to, or aggravation of, the condition where it was suffered or contracted before or during (but did not arise out of) the person’s relevant service.
Balance of Probabilities (BoP) — Statement of Principles No. 91 of 2019
7 factors
At least one of the following factors must exist before it can be said that, on the balance of probabilities, microscopic polyangiitis or death from microscopic polyangiitis is connected with the circumstances of a person's relevant service:
- (1)inhaling respirable crystalline silica dust, at the time material containing crystalline silica was being: (a) produced; (b) excavated; (c) drilled, cut or ground; or (d) used in construction, manufacturing, cleaning or blasting; for a cumulative period of at least 5 000 hours before the clinical onset of microscopic polyangiitis;
- (2)having silicosis at the time of the clinical onset of microscopic polyangiitis;
- (3)being treated with a drug from the specified list of drugs at the time of the clinical onset of microscopic polyangiitis;
Note: specified list of drugs is defined in the Schedule 1 - Dictionary.
- (4)inhaling respirable crystalline silica dust, at the time material containing crystalline silica was being: (a) produced; (b) excavated; (c) drilled, cut or ground; or (d) used in construction, manufacturing, cleaning or blasting; for a cumulative period of at least 5 000 hours before the clinical worsening of microscopic polyangiitis;
- (5)having silicosis at the time of the clinical worsening of microscopic polyangiitis;
- (6)being treated with a drug from the specified list of drugs at the time of the clinical worsening of microscopic polyangiitis;
Note: specified list of drugs is defined in the Schedule 1 - Dictionary.
- (7)inability to obtain appropriate clinical management for microscopic polyangiitis;
Aggravation-only factors: the factors in subsection 9(4) to 9(7) apply only to material contribution to, or aggravation of, the condition where it was suffered or contracted before or during (but did not arise out of) the person’s relevant service.
