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Clarifies the rock influence and structural constraints on the chemical composition of IIb trioctahedral chlorite from the Barberton greenstone belt in South Africa with implications to geothermometry. Analysis of chlorite grains; Relationship between chemical components of chlorite and the host rock; Cation substitution schemes.

Progressive respiratory muscle weakness and ineffective cough contributes to morbidity and mortality in children with neuromuscular diseases (NMD). Inspiratory muscle training (IMT) aims to preserve or improve respiratory muscle strength and reduce respiratory morbidity. This study aimed to determine the safety and efficacy of IMT in children with NMD. A randomised cross-over study compared three-month intervention (IMT) with control periods. During the intervention, children with NMD (5-18 years) from two provinces in South Africa performed 30 breaths (at 30% of inspiratory muscle strength (Pimax)) with an electronic threshold device, twice daily. During the control period participants did not perform any IMT. Twenty-three participants (median (IQR) age of 12.33 (10.03-14.17) years), mostly male (n=20) and non-ambulant (n=14) were included. No adverse events related to IMT were reported. There was no evidence of a difference in median patient hospitalisation and respiratory tract infection rates between control and intervention periods (p=0.60; p=0.21). During IMT, Pimax and peak cough flow improved with a mean (SD) of 14.57 (±15.67) cmH2O and 32.27 (±36.60) L/min, compared to a change of 3.04(±11.93)cmH2O (p=0.01) and -16.59 (±48.29) L/min (p=0.0005) during the control period. There was no evidence of change in spirometry, functional ability and total health-related quality of life scores following intervention. Patient satisfaction with IMT was high (median 8/10 (IQR 5-10)) and adherence was good. A three-month IMT programme in children with NMD is well tolerated, appears to be safe and is associated with a significant improvement in respiratory muscle strength and cough efficacy. [ABSTRACT FROM AUTHOR]

Objectives: To describe the prevalence of pediatric acute respiratory distress syndrome (pARDS) and the characteristics of children with pARDS in South African PICUs., Design: Observational multicenter, cross-sectional point-prevalence study., Setting: Eight PICUs in four South African provinces., Patients: All children beyond the neonatal period and under 18 years of age admitted to participating PICUs., Interventions: None., Measurements and Main Results: Clinical and demographic data were prospectively collected on a single day of each month, from February to July 2022, using a centralized database. Cases with or at risk of pARDS were identified using the 2015 Pediatric Acute Lung Injury Consensus Conference criteria. Prevalence was calculated as the number of children meeting pARDS criteria/the total number of children admitted to PICU at the same time points. Three hundred ten patients were present in the PICU on study days: 166 (53.5%) male, median (interquartile range [IQR]) age 9.8 (3.1-32.9) months, and 195 (62.9%) invasively mechanically ventilated. Seventy-one (22.9%) patients were classified as being "at risk" of pARDS and 95 patients (prevalence 30.6%; 95% CI, 24.7-37.5%) fulfilled pARDS case criteria, with severity classified as mild (58.2%), moderate (25.3%), and severe (17.6%). Median (IQR) admission Pediatric Index of Mortality 3 risk of mortality in patients with and without pARDS was 5.6 (3.4-12.1) % versus 3.9 (1.0-8.2) % ( p = 0.002). Diagnostic categories differed between pARDS and non-pARDS groups ( p = 0.002), with no difference in age, sex, or presence of comorbidities. On multivariable logistic regression, increasing admission risk of mortality (adjusted odds ratio [aOR] 1.02; 95% CI, 1.00-1.04; p = 0.04) and being admitted with a respiratory condition (aOR 2.64; 95% CI, 1.27-5.48; p = 0.01) were independently associated with an increased likelihood of having pARDS., Conclusions: The 30.6% prevalence of pARDS in South Africa is substantially higher than reports from other sociogeographical regions, highlighting the need for further research in this setting., Competing Interests: Dr. Morrow’s institution received funding from the Society of Critical Care Medicine, the National Research Foundation of South Africa, and the Critical Care Society of Southern Africa; she received funding from the European Cystic Fibrosis Society and Brazilian Physiotherapy Association. Drs. Solomon and Khan received funding from the Critical Care Society of Southern Africa. Dr. Solomon received funding from ANN LAKE Publications. Dr. Naidoo received funding from Mbuso Medical, Fresenius Kabi, and Nutricia. Dr. Argent received funding for travel, accommodation, and registration to attend a number of conferences as an invited guest speaker and for providing expert witness evidence to a number of medicolegal cases. The remaining authors have disclosed that they do not have any potential conflicts of interest., (Copyright © 2023 by the Society of Critical Care Medicine and the World Federation of Pediatric Intensive and Critical Care Societies.)