[COVID-19 readmissions during the first three epidemic periods in Orihuela, Spain: incidence, risk factors and letality].

Readmission for COVID-19 is associated with high mortality, saturation of health services, and high costs. This study aimed to assess the incidence and risk factors of readmissions in COVID-19 patients in a regional hospital of Spain from February 2020 to March 2021. A retrospective cohort study describing the characteristics of adult patients readmitted within thirty days of discharge after being infected with SARS-CoV-2 was carried out. Readmission associated risk factors were analysed using a binary logistic regression model. Of the 967 patients who survived their first COVID-19 admission, 70 (7.2%) were readmitted within thirty days. Of these, 34.3% presented pneumonia progression, 15.7% functional deterioration, and 12.9% other infections. The mortality rate during readmission was 28.6%. There were no statistically significant differences in the cumulative incidence of readmissions between the epidemic periods (p=0.241). Factors independently associated with readmission were: diabetes mellitus (aOR 1.96, 95%CI 1.07-3.57, p=0.030); acute kidney failure (aOR 2.69, 95%CI 1.43-5.07, p=0.002); not being a candidate for intensive care (aOR 7.68, 95% CI 4.28-13.80, p<0.001); and not being prescribed corticosteroids at discharge (aOR 2.15, 95% CI 1.04-4.44; p=0.039). A substantial proportion of patients admitted due to COVID-19 are readmitted, and they carry a high letality. Diabetes mellitus, acute kidney failure, not being a candidate for ICU admission, and not being prescribed corticosteroids on discharge are independently associated with an increased risk of readmission. Los reingresos por la COVID-19 se asocian a un incremento de la mortalidad, saturación de los servicios sanitarios y elevados costes. Este estudio pretendió evaluar la incidencia y los factores de riesgo de reingreso en pacientes con COVID-19 en un hospital comarcal español entre febrero de 2020 y marzo de 2021. Se realizó un estudio sobre una cohorte que describía las características de los pacientes adultos reingresados en los treinta días siguientes al alta tras un ingreso por la COVID-19. Se analizaron los factores de riesgo asociados a reingreso mediante un modelo de regresión de logística binaria. De los 967 pacientes dados de alta de un primer ingreso por la COVID-19, 70 (7,2%) reingresaron en los treinta días siguientes. De ellos, el 34,3% presentó progresión de la neumonía, el 15,7% deterioro funcional y el 12,9% otras infecciones. La letalidad en el reingreso fue del 28,6%. No hubo diferencias estadísticamente significativas en la incidencia acumulada de reingreso entre los tres periodos (p=0,241). Los factores asociados de forma independiente con el reingreso fueron: diabetes mellitus (ORa: 1,96; IC 95%:1,07-3,57; p=0,030); insuficiencia renal aguda (ORa 2,69; IC del 95%: 1,43-5,07, p=0,002); no ser candidato a cuidados intensivos (ORa 7,68, IC 95% 4,28-13,80, p<0,001); y no tener prescritos corticosteroides al alta (ORa 2,15, IC 95% 1,04- 4,44; p=0,039). Una proporción sustancial de los pacientes ingresados por la COVID-19 reingresan, con una elevada letalidad. La diabetes mellitus, la insuficiencia renal aguda, no ser candidato a ingreso en UCI y no tener prescritos corticoides al alta se asocian con un mayor riesgo de reingreso.