Dysnatremia in a changing climate: A global systematic review of the association between serum sodium and ambient temperature.

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.

A retrospective review of the short Synacthen test in Queensland hospitals.

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.

User Feedback on the MSF Tele-Expertise Service After a 4-Year Pilot Trial - A Comprehensive Analysis.

We surveyed all users of the Médecins Sans Frontières (MSF) tele-expertise service, approximately four years after it began operation. The survey contained 50 questions and was sent to 294 referrers and 254 specialists. There were 163 responses (response rate 30%). There were no significant differences between the responses from French and English users, so the responses were combined for subsequent analysis. Most of the responders were doctors (133 of 157 who answered that question), and most had completed field missions for MSF, i.e., both specialists and referrers. The majority stated that the system was user friendly and that they found it self-explanatory (i.e., they did not need to be shown how to use it). Almost all the referrers found that the telemedicine advice that they received was helpful, changed diagnosis and management, and/or reassured the patient. Similar feedback came from the specialists, who also felt that there was educational value for the field doctor. Although there was general satisfaction with the service, the survey identified various problems. The main concerns of the referrers were the lack of promotion of the system at headquarters' level, and the main concerns of the specialists were the lack of feedback about patient follow-up. Nonetheless, both referrers and specialists recognized the benefits of telemedicine in improving patient management, providing education, and reducing isolation in the field.

The Development of a Multilingual Tool for Facilitating the Primary-Specialty Care Interface in Low Resource Settings: the MSF Tele-Expertise System.

In 2009, Médecins Sans Frontières (MSF) started a pilot trial of store-and-forward telemedicine to support field workers. One network was operated in French and one in English; a third, Spanish network was brought into operation in 2012. The three telemedicine pilots were then combined to form a single multilingual tele-expertise system, tailored to support MSF field staff. We conducted a retrospective analysis of all telemedicine cases referred from April 2010 to March 2014. We also carried out a survey of all users in December 2013. A total of 1039 referrals were received from 41 countries, of which 89% were in English, 10% in French, and 1% in Spanish. The cases covered a very wide range of medical and surgical specialties. The median delay in providing the first specialist response to the referrer was 5.3 h (interquartile range 1.8, 16.4). The survey was sent to 294 referrers and 254 specialists. Of these, 224 were considered as active users (41%). Out of the 548 users, 163 (30%) answered the survey. The majority of referrers (79%) reported that the advice received via the system improved their management of the patient. The main concerns raised by referrers and specialists were the lack of support or promotion of system at headquarters' level and the lack of feedback about patient follow-up. Because of the size of the MSF organization, it is clear that there is potential for further organizational adoption.