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Mechanical ventilation (MV) has played a crucial role in the medical field, particularly in anesthesia and in critical care medicine (CCM) settings. MV has evolved significantly since its inception over 70 years ago and the future promises even more advanced technology. In the past, ventilation was provided manually, intermittently, and it was primarily used for resuscitation or as a last resort for patients with severe respiratory or cardiovascular failure. The earliest MV machines for prolonged ventilatory support and oxygenation were large and cumbersome. They required a significant amount of skills and expertise to operate. These early devices had limited capabilities, battery, power, safety features, alarms, and therefore these often caused harm to patients. Moreover, the physiology of MV was modified when mechanical ventilators moved from negative pressure to positive pressure mechanisms. Monitoring systems were also very limited and therefore the risks related to MV support were difficult to quantify, predict and timely detect for individual patients who were necessarily young with few comorbidities. Technology and devices designed to use tracheostomies versus endotracheal intubation evolved in the last century too and these are currently much more reliable. In the present, positive pressure MV is more sophisticated and widely used for extensive period of time. Modern ventilators use mostly positive pressure systems and are much smaller, more portable than their predecessors, and they are much easier to operate. They can also be programmed to provide different levels of support based on evolving physiological concepts allowing lung-protective ventilation. Monitoring systems are more sophisticated and knowledge related to the physiology of MV is improved. Patients are also more complex and elderly compared to the past. MV experts are informed about risks related to prolonged or aggressive ventilation modalities and settings. One of the most significant advances in MV has been protective lung ventilation, diaphragm protective ventilation including noninvasive ventilation (NIV). Health care professionals are familiar with the use of MV and in many countries, respiratory therapists have been trained for the exclusive purpose of providing safe and professional respiratory support to critically ill patients. Analgo-sedation drugs and techniques are improved, and more sedative drugs are available and this has an impact on recovery, weaning, and overall patients' outcome. Looking toward the future, MV is likely to continue to evolve and improve alongside monitoring techniques and sedatives. There is increasing precision in monitoring global "patient-ventilator" interactions: structure and analysis (asynchrony, desynchrony, etc). One area of development is the use of artificial intelligence (AI) in ventilator technology. AI can be used to monitor patients in real-time, and it can predict when a patient is likely to experience respiratory distress. This allows medical professionals to intervene before a crisis occurs, improving patient outcomes and reducing the need for emergency intervention. This specific area of development is intended as "personalized ventilation." It involves tailoring the ventilator settings to the individual patient, based on their physiology and the specific condition they are being treated for. This approach has the potential to improve patient outcomes by optimizing ventilation and reducing the risk of harm. In conclusion, MV has come a long way since its inception, and it continues to play a critical role in anesthesia and in CCM settings. Advances in technology have made MV safer, more effective, affordable, and more widely available. As technology continues to improve, more advanced and personalized MV will become available, leading to better patients' outcomes and quality of life for those in need., Competing Interests: The authors declare no conflicts of interest., (Copyright © 2023 International Anesthesia Research Society.)

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.)

Background: Traumatic brain injury (TBI) is a common cause of paediatric intensive care unit (PICU) admissions in South Africa. Optimal care of these patients includes the prevention and control of post-traumatic seizures (PTS) in order to minimise secondary brain injury., Objectives: To describe the demographics of children admitted to a South African PICU, to describe the characteristics of PTS, and to describe the prophylactic and therapeutic management of PTS within the unit., Methods: A 3-year retrospective chart review was conducted at the PICU of the Chris Hani Baragwanath Academic Hospital (CHBAH) in Soweto, Johannesburg, from 1 July 2015 to 30 June 2018., Results: Seventy-eight patients were admitted to the PICU, all with severe TBI. A total of 66 patient files were available for analysis. The median age of admission was 6 years (interquartile range (IQR) 4 - 9) with the majority of trauma secondary to mechanical injury (89%). Prophylactic anti-epileptic drugs (AEDs) were initiated in 44 (79%) patients. Early PTS occurred in 11 (25%) patients who received prophylaxis and 4 (33%) who did not. Three (5%) patients developed late PTS, resulting in an overall incidence of PTS of 43%. The most common seizure type was generalised tonic clonic (82%). Children diagnosed with PTS were a median of 2 years younger than those without PTS, with increased prevalence of seizures (83% v. 38%) in children below 2 years of age. Maintenance therapy was initiated in all patients consistent with recommended dosages. Of the total 167 anti-epileptic levels taken during maintenance, only 56% were within target range. Of the initial 78 patients, 8 died (10%). The median length of stay was 7 (IQR 5 - 12) and 8 (IQR 8 - 24) days longer in ICU and hospital respectively, in children with PTS., Conclusion: PTS is a frequent complication of severe TBI in children. There was considerable variation in the approach to both prophylaxis and maintenance therapy of PTS in terms of choice of agent, dosage, frequency of drug monitoring and approach to subtherapeutic levels. It is clear that more high-level studies are required in order to better inform these practices., Contributions of the Study: To the best of our knowledge, this article represents the first description of incidence and management practices of paediatric post traumatic seizures., Competing Interests: Conflicts of interest: None.

Objectives: To evaluate the performance of the Pediatric Index of Mortality 3 as mortality risk assessment model., Design: This prospective study included all admissions 30 days to 18 years old for 12 months during 2016 and 2017. Data gathered included the following: age and gender, diagnosis and reason for PICU admission, data specific for the Pediatric Index of Mortality 3 calculation, PICU outcomes (death or survival), and length of PICU stay., Setting: Nine units that care for children within tertiary or quaternary academic hospitals in South Africa., Patients: All admissions 30 days to 18 years old, excluding premature infants, children who died within 2 hours of admission, or children transferred to other PICUs, and those older than 18 years old., Interventions: None., Measurements and Main Results: There were 3,681 admissions of which 2,253 (61.3%) were male. The median age was 18 months (interquartile range, 6-59.5 mo). There were 354 deaths (9.6%). The Pediatric Index of Mortality 3 predicted 277.47 deaths (7.5%). The overall standardized mortality ratio was 1.28. The area under the receiver operating characteristic curve was 0.81 (95% CI 0.79-0.83). The Hosmer-Lemeshow goodness-of-fit test statistic was 174.4 (p < 0.001). Standardized mortality ratio for all age groups was greater than 1. Standardized mortality ratio for diagnostic subgroups was mostly greater than 1 except for those whose reason for PICU admission was classified as accident, toxin and envenomation, and metabolic which had an standardized mortality ratio less than 1. There were similar proportions of respiratory patients, but significantly greater proportions of neurologic and cardiac (including postoperative) patients in the Pediatric Index of Mortality 3 derivation cohort than the South African cohort. In contrast, the South African cohort contained a significantly greater proportion of miscellaneous (including injury/accident victims) and postoperative noncardiac patients., Conclusions: The Pediatric Index of Mortality 3 discrimination between death and survival among South African units was good. Case-mix differences between these units and the Pediatric Index of Mortality 3 derivation cohort may partly explain the poor calibration. We need to recalibrate Pediatric Index of Mortality 3 to the local setting., Competing Interests: Dr Solomon received funding from Ann Lake Publications (paid honorarium for invited article). Dr. Naidoo received funding from Getinge, Drager, Biomerieux, Astellas, and Fresenius Kabi. Dr. Morrow received funding from the University of Cape Town, Imperial College Press (royalties), and Critical Care Society of Southern Africa (travel and accommodation). Dr Argent received funding from N Kelly attorneys for medicolegal advice. The remaining authors have disclosed that they do not have any potential conflicts of interest., (Copyright © 2021 by the Society of Critical Care Medicine and the World Federation of Pediatric Intensive and Critical Care Societies.)

Background: High-frequency oscillatory ventilation (HFOV) remains an option for the management of critically ill children when conventional mechanical ventilation fails. However, its use is not widespread, and there is wide variability reported with respect to how it is used., Objectives: To describe the frequency, indications, settings and outcomes of HFOV use among paediatric patients with a primary respiratory disorder admitted to a tertiary paediatric intensive care unit (PICU)., Methods: The study was a 2-year, single-centre, retrospective chart review., Results: Thirty-four (32.7%) patients were managed with HFOV in the PICU during the study period. Thirty-three of the 34 patients had paediatric acute respiratory distress syndrome. Indications for HFOV were inadequate oxygenation in 17 patients (50%), and refractory respiratory acidosis in 15 patients (44.1%) (2 patients did not fit into either category). Approaches to the setting of HFOV varied considerably, particularly with respect to initial pressure around the airways. HFOV was effective at improving both oxygenation, with a median (interquartile range (IQR)) decrease in oxygenation index of 6.34 (5.0 - 9.5), and ventilation with a the median decrease in PaCO 2 of 67.6 (46.2 - 105.7) mmHg after 24 hours. Overall mortality was 29.4% in the HFOV group, which is consistent with other studies., Conclusion: HFOV remains an effective rescue ventilatory strategy, which resulted in rapid and sustained improvement in gas exchange in patients with severe hypoxaemia and/or severe respiratory acidosis, particularly in the absence of extracorporeal support. However, the variability in practice and the adverse effects described highlight the need for future high-quality randomised controlled trials to allow for development of meaningful guidelines to optimise HFOV use., Contributions of the Study: This study describes the use and outcomes of high-frequency oscillatory ventilation (HFOV) in a South African paediatric intensive care unit, thus addressing a local knowledge gap and providing evidence of the continued efficacy of HFOV for severe hypoxaemia and refractory respiratory acidosis in settings without access to extracorporeal technologies., Competing Interests: Conflicts of interest: None.