Clinical Characteristics of Vulnerable Populations Hospitalized and Diagnosed with COVID‑19 during Second Wave in Buenos Aires, Argentina.

There are a few in Argentina publications regarding the presentation of patients with COVID-19 requiring hospitalized and emergency care in vulnerable populations that compares the first and second wave, and it has few reports in developing countries. The objective is to determine whether in the care of vulnerable patients, to succeed against COVID-19, multiple public health tools and interventions necessary to minimize morbidity and mortality. The study is a prospective cohort investigation of 3028 patients during second wave with lab-confirmed COVID-19, who required any of the Health Centers response from April 1, 2021, to June 30, 2021. In a previous publication, our group analyzed the situation of hospitalized patients during the first wave in the same region, "Southeast Network" (SN), Buenos Aires Metropolitan Area (AMBA). SN with 1.8 million inhabitants residing in urban and rural areas. A total of 14 health centers with different levels of care complexity provide care to patients in the region. The information of each patient with COVID-19 evaluated by SN, was incorporated in an Epidemiological Dashboard. The investigation was designed and reported with consideration of observational studies in epidemiology. A total of 57.9% patients were men, and the mean age (SD) was 52.1 (13.5) years. Sixty four percent patients with pre-existing diseases, most frequent hypertension and diabetes, but diabetes, obesity, and cardiovascular disease presented higher risk. A total of 24.7% were hospitalized in Intensive Therapy Unit. The mortality of the cohort was 22.9%. Mortality was higher for patients aged 65 or more, and for those had some pre-existing disease. But, it was a slightly more than double that in the first wave, it is possible mainly due to the fact that more than doubled of patients in Second wave required hospitalization in ITU, compared to First wave. The patients presented greater severity of their medical condition at the time of their hospitalization. These findings were similar to those reported by other authors. Another possible cause of the high number of patients in the period studied is due to the fact that most of the hospitalized population had not been vaccinated. The health system was able to respond to the demand.