Abstract
Introduction :
Pulmonary hypertension assessed by echocardiography in patients with COVID-19 has not been adequately studied and it is unknown precisely whether it is linked to worse outcomes.
Materials and Methods :
Retrospective study of 306 adults infected with COVID-19 by antigenic or molecular testing. The main objective was to evaluate the role of the probability of echocardiographic pulmonary hypertension and its relationship with morbidity and mortality according to the ROX index in patients with COVID-19 infection. In the inferential statistical analysis, the OR odds ratios with their confidence intervals greater than 95% were used as measures of association. Qualitative variables were evaluated using the Chi square test or Fisher's exact test, and in the case of numerical or quantitative variables, the Student's T test or Mann-Whitney test was used.
Results :
The highest frequency in gender was Male 78% and Female 22%, the ROX values were higher in survivors at 2 h 5.8 (4.7 - 6.9), in relation to the deceased 4.5 (3.6 - 5 ,6). Likewise, at 12 h the values were higher in the group of survivors 7.8 (5.2 - 8.7) in relation to the deceased 4.9 (3.8 - 6.0). The odds ratio adjusted for age and gender of the ROX index was 8.5, CI (2.0 - 91.4) at 2 h and 17.6, CI (2.8 - 93.6) at 12 h. A statistical correlation was evident between lower values of the ROX index with values of high probability of pulmonary hypertension (p=0.048) as well as higher mortality (p=0.037).
Discussion :
The present study showed a correlation between the ROX index with pulmonary pressure values estimated by transthoracic echocardiogram and older age groups, showing higher mortality in those over 70 years of age and a higher rate of comorbidities and lower ROX.
Conclusions:
A greater probability of pulmonary hypertension is linked to high mortality in COVID-19; studies with larger groups of patients are required to validate the results found here.