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Background Differences in mean gradients after Transcatheter valve replacement (TAVR) vary depending on the valve type and the modality used to measure the gradients. Currently there is a paucity of data on the relationship between invasive and doppler derived gradients after TAVR. Purpose We sort to assess the difference in doppler, and catheter derived aortic valve gradients after TAVR Methods This is a single center retrospective study using consecutive patients who presented for TAVR on account of native aortic valve stenosis at our institution from May 2012 till December 2020. Patients with both intraoperative invasive and postoperative doppler derived pressure gradients were included in the analysis. Student T-test were used to compare mean gradients. Pearson's correlation test was used to examine the correlation between measured gradients. Results A total of 587 patients were included in our study. Fifty one percent were male and 462 (78.7%) underwent TAVR with a balloon expandable valve. In the entire cohort the mean gradient measured invasively was significantly lower than those measured by echo doppler (4.48±3.25 vs. 5.57±3.11, P Conclusion Post TAVR gradients were all significantly lower when measured invasively as compared to those measured using doppler. Self-expanding valves overall had higher residual gradients. Further studies are needed to assess the correlations between invasively measured gradients and clinical outcomes post TAVR. Funding Acknowledgement Type of funding sources: None.

Background/Introduction Patients with COVID-19 are at increased risk for mortality during hospitalization. Better definition of the incidence, predictors, and outcomes of cardiac arrest during hospitalization for COVID-19 may support early identification and intervention. Purpose To estimate the incidence of in-hospital cardiac arrest in patients with COVID-19, describe the temporal trends in incidence of and survival after cardiac arrest, summarise characteristics of those who experienced a cardiac arrest, and compare the characteristics of survivors versus non-survivors of cardiac arrest. Methods We conducted a retrospective cohort study of patients admitted for COVID-19 to a tertiary medical center comprising three hospitals between March and November 2020. Data entry is ongoing for more than 2000 patients admitted through 2021. Clinical variables extracted via review of electronic medical records included age, sex, race/ethnicity, body mass index, history of cardiovascular disease (ie., coronary artery disease, congestive heart failure, atrial fibrillation, or cerebrovascular event), other comorbidities included in the Charlson comorbidity index, date of admission, duration of hospitalization, all cardiac arrest events during hospitalization, presenting rhythm during first cardiac arrest, and death. Data were described using summary statistics. Multivariable logistic regression was used to evaluate associations. Results Among 1666 patients, 107 (6.4%) experienced at least one in-hospital cardiac arrest event during hospitalization for COVID-19, of which 25 (23%) survived to hospital discharge. From March to October 2020, there was a decrease in estimated cardiac arrest incidence in-hospital from 8.2% to 3%, whereas estimated survival to hospital discharge after an arrest remained similar at approximately 20% (Figure). Compared to those who did not, patients who experienced in-hospital cardiac arrest were older and more likely to have existing cardiovascular disease, as well as other comorbidities. Similar factors were associated with lower chance of survival after cardiac arrest (Table). Patients with pulseless ventricular tachycardia/fibrillation (VT/VF) as presenting rhythm in cardiac arrest had better survival to hospital discharge compared to those with other rhythms (OR 3.3, p=0.02). Younger age (per 10 years, OR=0.7, p=0.03) and fewer comorbidities (per one fewer comorbidity, OR=1.5, p=0.05) were associated with better survival after cardiac arrest in multivariable logistic regression. Conclusion There was a decline in estimated incidence of cardiac arrest during hospitalization for COVID-19 since beginning of pandemic, with survival to hospital discharge after cardiac arrest estimated to be stable at around 20%. Younger age and fewer comorbidities especially cardiovascular disease were associated with better survival after an in-hospital cardiac arrest. Funding Acknowledgement Type of funding sources: Public hospital(s). Main funding source(s): Rush University Medical Center Figure 1Table 1

Background/Introduction The high prevalence of thromboembolism in patients with COVID-19 causes significant morbidity and mortality. The soluble urokinase-type plasminogen activator receptor (suPAR), a known inflammatory and immune mediator in several renal and cardiovascular conditions, has recently been shown to correlate with acute kidney injury and severe respiratory failure in COVID-19. To date, no study has investigated the association between suPAR and thromboembolism in COVID-19. Purpose To evaluate associations between suPAR, thromboembolic complications, and mortality in COVID-19. Methods We conducted a retrospective cohort study of a random sample of 109 patients among those hospitalised at a tertiary medical centre comprising three hospitals between March and June 2020 for COVID-19 who had blood samples collected and stored on admission. Serum suPAR was measured using a commercially available enzyme immunoassay. Baseline (hospital admission) variables extracted from electronic medical records included age, sex, race/ethnicity, body mass index (BMI), history of cardiovascular disease (including deep venous thrombosis [DVT] and pulmonary embolism [PE]), serum creatinine, serum D-dimer, incident DVT/PE, and death during hospitalization. Patients were subsequently grouped by suPAR quartiles. Associations between suPAR, thromboembolic complications (PE and/or DVT), and overall mortality were evaluated using multivariable logistic regression. Results Among the 109 patients, mean age was 56 (standard deviation [SD], 16) years, 34 (39%) were women, mean BMI was 35 (SD, 8) kg/m2, 78 (71%) had coexisting cardiovascular disease, median creatinine level was 1.2 (interquartile range [IQR]: 0.8–2.3) mg/dl, median D-dimer level was 1.5 (IQR, 0.8–6.4) μg/ml, and median suPAR level was 10.1 (IQR: 4.1–14.4) pg/mL. Seven (6%) patients were found to have PE, 18 (17%) developed PE/DVT, and 22 (20%) died during the admission (Table). Per quartile higher suPAR level, there was higher risk for PE or DVT (OR=2.02, 95% CI 1.07–3.83, p=0.03). Compared to those in the lowest suPAR quartile, patients in the highest quartile had 11.1 times higher risk for PE/DVT (OR=11.1, 95% CI 1.51–81.8, p=0.02, Figure). SuPAR is also associated with overall mortality, with 2.25 times higher risk of death seen per quartile increase in suPAR level (OR= 2.25, 95% CI 1.24–4.06, p=0.007). Conclusion Higher suPAR levels at the time of hospital admission is associated with higher risk for thromboembolic complications i.e., PE and DVT, as well as mortality in patients with COVID-19. Funding Acknowledgement Type of funding sources: Public hospital(s). Main funding source(s): Rush University Medical Center