ABSTRACT
Background: The COVID-19 pandemic has spread globally, infecting and killing millions. Those subjects with cardiovascular disease (CVD) are at higher risk of severe COVID-19 morbidity and mortality following SARSCoV- 2 infection. Purpose: To investigate the response to different treatments against COVID-19 in patients with a pre-existing CVD. Methods: We conducted a systematic review and meta-analysis following Cochrane, PRISMA and MOOSE guidelines (PROSPERO ref:CRD42020183057). Eligible articles reported in-hospital mortality rate in COVID-19 patients with CVD after testing specific treatments. Statistical concordance was performed by Cohen's kappa coefficient. The primary outcome was in-hospital mortality rate, secondary outcome was the length of hospital stay (LOS). The analysis utilised a random-effects model. Categorical variables were expressed as risk ratio (RR) and continuous variable with weighted mean difference (WMD) and standard deviation with 95% confidence interval (CI). I2 and Chi-tests were used to assess studies' heterogeneity. Publication bias was visualised by L'Abbe' plot and funnel plot with Egger's test. Subgroup analysis (pooling analysis) was also performed to compare the three groups' mortality differences: 'CVD treated' vs.'CVD untreated' vs.'no-CVD (treated and untreated)'. Meta-regression models were used to determine the effects of specific treatments and risk factors on the primary outcomes. R-studio used for analysis. Results: Of 1,673 articles retrieved, 46 studies included CVD patients from which 11 included control group, finally five were comparative studies and were included in the quantitative analysis. From those studies, the sample size was 130 (mean age 63.9±2.7 years;55.3% male). There was 100% concordance between reviewers equating to a Cohen's kappa coefficient of κ=1. The most frequent CV risk factor (CVRF) was hypertension (60%) followed by diabetes (28.5%). The most frequent CVD seen in patients was coronary artery disease at 9.09% and peripheral arterial disease at 5.4%. Mortality rate was significant higher in the CVD treated group (RR:1.52;95% CI [1.05,2.21], CVD treated vs overall population p=0.03). Meta-regression showed that no treatment was significant associated to mortality and systemic hypertension, but an independent risk factor for mortality. Pooled single analysis showed no difference between treated vs untreated CVD patients. There was certain degree of heterogeneity (I2 50%) across the studies. L'Abbe and funnel plot visualized not significant dispersion (Egger test, p=0.71). There was no difference in terms of LOS [0,79, 95% CI (-0.48, 2,05);p-value 0.22]. Conclusions: This quantitative analysis showed that CVD patients despite specific treatments were exposed to significant higher mortality when compared to the overall population. These results remark the clinical relevance to reduce CVD risk factors and ameliorate specific COVID-19 treatments to lower the risk of mortality in this group.