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Background: The short Synacthen test (SST) is widely used to investigate adrenal insufficiency, but it can be time‐consuming, costly and labour‐intensive to perform and is not without risk of adverse events. Aim: To review SST requesting patterns and practices across public hospitals in Queensland. Methods: The electronic medical records of patients who underwent a SST with Pathology Queensland between January 2020 and December 2020 were reviewed to collect data regarding the indication for the test, the requesting speciality, SST results and any adverse events. Results: Six hundred and fifty‐two SSTs were identified, of which 363 individual patients were included in the analysis. The majority of the tests (n = 198, 54.5%) were performed in the inpatient setting. Endocrinology most commonly ordered SSTs (n = 188, 51.8%). The suspected aetiology of adrenal insufficiency was unclear in a large proportion of requests (n = 167, 46.0%). Static testing of morning cortisol prior to SST was performed in only 249 (68.6%) patients. Of 140 inpatients data, 17.9% (n = 25) showed a robust static cortisol of ≥400 nmol/L and were treated as having normal adrenal function, suggesting SST was unnecessary in these patients. Twenty‐two (6.1%) patients had a documented adverse event occurring during or after the SST. Conclusions: There was wide variability in requesting patterns and practices for SSTs across Queensland. More than one in six SSTs could have been avoided if a static morning cortisol had been performed prior. Clinician education and the adoption of a structured referral form may improve testing practices. [ABSTRACT FROM AUTHOR]

Objective: Both hyponatremia and hypernatremia have been reported to occur more frequently with higher ambient temperatures, although the underlying mechanisms are not well understood. Global temperatures are rising due to climate change, which may impact the incidence of dysnatremia worldwide. We aimed to identify, collate and critically appraise studies analyzing the relationship between climate measures (outdoor temperature, humidity) and serum sodium concentrations. Design: Systematic review, reported in accordance with PRISMA guidelines. Methods: MEDLINE and Embase were searched with relevant key terms. Studies assessing the effect on serum sodium measurement of elevated temperature or humidity versus a comparator were included. Results: Of 1466 potentially relevant studies, 34 met inclusion criteria, originating from 23 countries spanning all inhabited continents. The majority (30 of 34, 88%) reported a significant association between outdoor temperature and dysnatremia, predominantly lower serum sodium with increased ambient temperature. Humidity had a less consistent effect. Individuals aged above 65 years, children, those taking diuretics and antidepressants, those with chronic renal impairment or those undertaking physical exertion had increased vulnerability to heat‐associated dysnatremia. The risk of bias was assessed to be high in all but four studies. Conclusions: Higher ambient temperature is consistently associated with an increased incidence of hyponatremia. We infer that hyponatremia presentations are likely to rise with increasing global temperatures and the frequency of extreme heat events secondary to climate change. Evidence‐based public health messages, clinician education and reduction in fossil fuel consumption are necessary to reduce the expected burden on healthcare services worldwide. [ABSTRACT FROM AUTHOR]