Abstract Funding Acknowledgements Type of funding sources: None. Background Survival after sudden cardiac arrest (CA) remains low at approximately 10% despite recent advances in cardiopulmonary resuscitation (CPR). Extracorporeal life support (ECLS) may be useful to improve outcomes. However, it is resource intensive and associated with significant complications. We therefore performed a meta-analysis of all available observational studies of patients receiving ECLS-facilitated CPR to estimate the overall survival rate to discharge and predictors of survival. Methods We conducted a literature search in MEDLINE, PubMed EMBASE and the Cochrane Library from inception to September 2020. Studies were included if they focused on ECLS during CPR for CA in adult patients and provided survival data. Results Among the 1745 articles identified by our search, 81 studies involving 9256 patients were included in the analysis. Overall, the pooled estimated survival was 26.2% at discharge and 20.4% with a good neurological outcome. The heterogeneity across studies was significant for both outcomes. Meta-regressions found a significant association between survival at discharge and lower lactate values (b=-0.1, 95% CI [-0.2; -0.05], p=0.002), intrahospital CA (b= 0.005, 95% CI [0.002; 0.008], p= 0.002), and lower CPR duration (b=-0.009, 95% CI [-0.02; -0.002], p=0.02). After adjustment for age, intrahospital CA, and mean CPR duration, an initial shockable rhythm was the only independent factor associated with survival to discharge (b=0.02, 95% CI [0.007; 0.02], p=0.0004). Conclusion The overall survival rate on discharge of ECLS-facilitated CPR for CA was 26.2%, and the survival with good neurological outcome was 20.4%. An initial shockable rhythm was the only independent predictor of survival to discharge.
Prasugrel and ticagrelor are potent P2Y12-ADP receptor antagonists which are superior to clopidogrel in acute coronary syndromes. To date no clinical trial directly compared these two drugs. Platelet reactivity correlates with ischemic and bleeding events in patients undergoing percutaneous coronary intervention. Recent pharmacological studies have observed a delayed onset of action of these two drugs in ST-segment elevation myocardial infarction (STEMI). We provide the first adequately powered pharmacological study comparing PR following ticagrelor and prasugrel loading dose (LD) in STEMI patients when the maximal biological effect is reached. In the present study, ticagrelor was associated with a lower rate of high on-treatment PR compared to prasugrel.
Summary Pretreatment with a loading dose (LD) of clopidogrel or ticagrelor before percutaneous coronary intervention (PCI) in acute coronary syndrome (ACS) is supported by the guidelines, but debated following a recent meta-analysis on clopidogrel pretreatment and the ACCOAST trial. In this trial prasugrel pretreatment failed to reduce ischaemic events. The timing of optimal platelet reactivity (PR) inhibition of ticagrelor and prasugrel in non ST-elevation ACS (NSTE ACS) is yet undetermined. In the present study, we aimed to investigate the delay required to reach optimal PR inhibition in NSTE ACS following a LD of ticagrelor or prasugrel. Consecutive patients undergoing PCI for NSTE ACS were randomised in this monocentre study. The Vasodilatorphosphoprotein index (VASP) was used to measure PR before the LD and then at 30 minutes, 1, 2, 4 and 24 hours (h) post-LD. Optimal PR inhibition was defined as a VASP< 50 %. We randomised 24 patients to ticagrelor or prasugrel LD. One hour after the LD, 29 % of patients had a VASP > 50 % (ticagrelor and prasugrel: 25 vs 33 %; p=0.7). Optimal PR inhibition was obtained 2 h after the LD in both groups (12/12 with ticagrelor and 11/12 with prasugrel). At that time, the mean VASP index was 19 ± 16 % (95 %CI: 12–25). Maximal PR inhibition was reached after 4 h: 11 ± 10 % (95 %CI: 6–15). In NSTE ACS undergoing PCI a LD of ticagrelor or prasugrel given during the procedure provides optimal P2Y12-ADP receptor blockade in 2 h and maximal inhibition within 4 h.
