People in intensive care with COVID ‐19: demographic and clinical features during the first, second, and third pandemic waves in Australia

• DOI: 10.5694/mja2.51590
• Publication Date: 2022-06-10T06:24:09Z
• Authors: Husna Begum; Ary S Neto; Patricia Alliegro; Tessa Broadley; Tony Trapani; Lewis T Campbell; Allen C Cheng; Winston Cheung; D James Cooper; Simon J Erickson; Craig J French; Edward Litton; Richard McAllister; Alistair Nichol; Annamaria Palermo; Mark P Plummer; Hannah Rotherham; Mahesh Ramanan; Benjamin Reddi; Claire Reynolds; Steven AR Webb; Andrew A Udy; Aidan Burrell
• Keywords: Male; Critical Care; Research; Australia; 610; COVID-19; Middle Aged; 3. Good health; Intensive Care Units; 03 medical and health sciences; 0302 clinical medicine; Humans; Hospital Mortality; Pandemics

To compare the demographic and clinical features, management, and outcomes for patients admitted with COVID-19 to intensive care units (ICUs) during the first, second, and third waves of the pandemic in Australia.People aged 16 years or more admitted with polymerase chain reaction-confirmed COVID-19 to the 78 Australian ICUs participating in the Short Period Incidence Study of Severe Acute Respiratory Infection (SPRINT-SARI) Australia project during the first (27 February - 30 June 2020), second (1 July 2020 - 25 June 2021), and third COVID-19 waves (26 June - 1 November 2021).Primary outcome: in-hospital mortality.ICU mortality; ICU and hospital lengths of stay; supportive and disease-specific therapies.2493 people (1535 men, 62%) were admitted to 59 ICUs: 214 during the first (9%), 296 during the second (12%), and 1983 during the third wave (80%). The median age was 64 (IQR, 54-72) years during the first wave, 58 (IQR, 49-68) years during the second, and 54 (IQR, 41-65) years during the third. The proportion without co-existing illnesses was largest during the third wave (41%; first wave, 32%; second wave, 29%). The proportion of ICU beds occupied by patients with COVID-19 was 2.8% (95% CI, 2.7-2.9%) during the first, 4.6% (95% CI, 4.3-5.1%) during the second, and 19.1% (95% CI, 17.9-20.2%) during the third wave. Non-invasive (42% v 15%) and prone ventilation strategies (63% v 15%) were used more frequently during the third wave than during the first two waves. Thirty patients (14%) died in hospital during the first wave, 35 (12%) during the second, and 281 (17%) during the third. After adjusting for age, illness severity, and other covariates, the risk of in-hospital mortality was similar for the first and second waves, but 9.60 (95% CI, 3.52-16.7) percentage points higher during the third than the first wave.The demographic characteristics of patients in intensive care with COVID-19 and the treatments they received during the third pandemic wave differed from those of the first two waves. Adjusted in-hospital mortality was highest during the third wave.