Clinical Characteristics and Risk Factors of Respiratory Failure in a Cohort of Young Patients Requiring Hospital Admission with SARS-CoV2 Infection in Spain: Results of the Multicenter SEMI-COVID-19 Registry.

BACKGROUND: Age is a risk factor for COVID severity. Most studies performed in hospitalized patients with SARS-CoV2 infection have shown an over-representation of older patients and consequently few have properly defined COVID-19 in younger patients who require hospital admission. The aim of the present study was to analyze the clinical characteristics and risk factors for the development of respiratory failure among young (18 to 50 years) hospitalized patients with COVID-19. METHODS: This retrospective nationwide cohort study included hospitalized patients from 18 to 50 years old with confirmed COVID-19 between March 1, 2020, and July 2, 2020. All patient data were obtained from the SEMI-COVID Registry. Respiratory failure was defined as the ratio of partial pressure of arterial oxygen to fraction of inspired oxygen (PaO2/FiO2 ratio) ≤200 mmHg or the need for mechanical ventilation and/or high-flow nasal cannula or the presence of acute respiratory distress syndrome. RESULTS: During the recruitment period, 15,034 patients were included in the SEMI-COVID-19 Registry, of whom 2327 (15.4%) were younger than 50 years. Respiratory failure developed in 343 (14.7%), while mortality occurred in 2.3%. Patients with respiratory failure showed a higher incidence of major adverse cardiac events (44 (13%) vs 14 (0.8%), p<0.001), venous thrombosis (23 (6.7%) vs 14 (0.8%), p<0.001), mortality (43 (12.5%) vs 7 (0.4%), p<0.001), and longer hospital stay (15 (9-24) vs 6 (4-9), p<0.001), than the remaining patients. In multivariate analysis, variables associated with the development of respiratory failure were obesity (odds ratio (OR), 2.42; 95% confidence interval (95% CI), 1.71 to 3.43; p<0.0001), alcohol abuse (OR, 2.40; 95% CI, 1.26 to 4.58; p=0.0076), sleep apnea syndrome (SAHS) (OR, 2.22; 95% CI, 1.07 to 3.43; p=0.032), Charlson index ≥1 (OR, 1.77; 95% CI, 1.25 to 2.52; p=0.0013), fever (OR, 1.58; 95% CI, 1.13 to 2.22; p=0.0075), lymphocytes ≤1100 cells/µL (OR, 1.67; 95% CI, 1.18 to 2.37; p=0.0033), LDH >320 U/I (OR, 1.69; 95% CI, 1.18 to 2.42; p=0.0039), AST >35 mg/dL (OR, 1.74; 95% CI, 1.2 to 2.52; p=0.003), sodium <135 mmol/L (OR, 2.32; 95% CI, 1.24 to 4.33; p=0.0079), and C-reactive protein >8 mg/dL (OR, 2.42; 95% CI, 1.72 to 3.41; p<0.0001). CONCLUSIONS: Young patients with COVID-19 requiring hospital admission showed a notable incidence of respiratory failure. Obesity, SAHS, alcohol abuse, and certain laboratory parameters were independently associated with the development of this complication. Patients who suffered respiratory failure had a higher mortality and a higher incidence of major cardiac events, venous thrombosis, and hospital stay.

[Validation of a prognostic model for polypathological patients (PP) in Primary Health Care: "PROFUND STUDY-AP"]. / Validación de un modelo pronóstico para pacientes pluripatológicos en atención primaria: Estudio PROFUND en atención primaria.

AIMS: to validate the PROFUND index in PP in Primary Health Care (PHC). DESIGN: two-year prospective multicenter study. LOCATION: three health care centers in Seville Province (Spain). SUBJECTS OF THE ASSESSMENT: PP with signed informed consent. SAMPLE: n=446 (p=20%; α=5%; ß=99%); consecutive sampling. MEASUREMENT: Dependent variable: mortality (2 years). INDEPENDENT VARIABLES: socio-demography, clinic, anthropometric, laboratory, pharmacologic prescriptions, functional, cognitive and socio-familiar evaluation and the use of health resources. INFORMATION SOURCE: interview with patients and clinical charts. STATISTICAL ANALYSIS: uni and multivariate analysis according to the variables; Accuracy was assessed in the cohort by risk terciles calibration, and discrimination power, by ROC curves. Finally, accuracy of the index was compared with that of the Charlson index. RESULTS: 446 subjects were included (53.8% men); average age was 75.44yr (Confidence interval 95% 74.58-76.31). Average of diagnostic categories was 2.37 (Confidence interval 95% 2.30-2.44). Prevalent categories were: A (64.1%), F (41.7%) and E (33.5%). Mortality within 2 years was 24.1%. Calibration in predicted/observed mortality along the three established risk strata was 16%/16.7% for PP with 0-2 points, 22%/19.5% for PP with 3-6, and 34%/36% for PP with 7 or more points (Hosmer-Lemeshow test with p=0.119). Discrimination power of PHC PROFUND's by area under the curve was (AUC) ROC was 0.622 (Confidence interval 95% 0.556-0.689; p<0.001), and that of Charlson index 0.510 (Confidence interval 95% 0.446 - 0.575; p>0.005). CONCLUSIONS: The PROFUND index is a good indicative tool in the stratification of 2-year mortality risk polypathological patients in PHC.