Early experience with critically ill patients with COVID-19 in Montreal

Purpose Montreal has been the epicentre of the coronavirus disease (COVID-19) pandemic in Canada. Given the regional disparities in incidence and mortality in the general population, we aimed to describe local characteristics, treatments, and outcomes of critically ill COVID-19 patients in Montreal. Methods A single-centre retrospective cohort of consecutive adult patients admitted to the intensive care unit (ICU) of Hôpital du Sacré-Coeur de Montréal with confirmed COVID-19 were included. Results Between 20 March and 13 May 2020, 75 patients were admitted, with a median [interquartile range (IQR)] age of 62 [53–72] yr and high rates of obesity (47%), hypertension (67%), and diabetes (37%). Healthcare-related infections were responsible for 35% of cases. The median [IQR] day 1 sequential organ failure assessment score was 6 [3–7]. Invasive mechanical ventilation (IMV) was used in 57% of patients for a median [IQR] of 11 [5–22] days. Patients receiving IMV were characterized by a moderately decreased median [IQR] partial pressure of oxygen:fraction of inspired oxygen (day 1 PaO 2 :F i O 2 = 177 [138–276]; day 10 = 173 [147–227]) and compliance (day 1 = 48 [38–58] mL/cmH 2 O; day 10 = 34 [28–42] mL/cmH 2 O) and very elevated estimated dead space fraction (day 1 = 0.60 [0.53–0.67]; day 10 = 0.72 [0.69–0.79]). Overall hospital mortality was 25%, and 21% in the IMV patients. Mortality was 82% in patients ≥ 80 yr old. Conclusions Characteristics and outcomes of critically ill patients with COVID-19 in Montreal were similar to those reported in the existing literature. We found an increased physiologic dead space, supporting the hypothesis that pulmonary vascular injury may be central to COVID-19-induced lung damage.