AstraZeneca coronavirus disease 2019 vaccinations have recently been implicated in thromboembolism formations. Our aim was to investigate the outcomes of patients with thromboembolic events following the AstraZeneca vaccine (ChAdOx1 nCoV-19, AZD1222). A literature search was performed from December 2019 to September 2021. Eligible studies must report participants older than 18 years vaccinated with AstraZeneca and outcomes of thromboembolic events. Pooled mean or proportion were analyzed using a randomeffects model. A total of 45 unique studies (number of patients U 144, 64.6% women, mean age 21-68 years) were included. The most common presenting adverse events were headache (12.1%), intracerebral hemorrhage (7.5%), and hemiparesis (7%). The most common thromboembolic adverse events were cerebral venous sinus thrombosis (38.5%) and deep vein thrombosis/pulmonary embolism (21.1%). The most common radiologic finding were intracerebral hemorrhage and cerebral venous thrombosis. Laboratory findings included thrombocytopenia (75%) and hypofibrinogenemia (41%). On admission, 64 patients tested positive for PF4-Heparin ELISA assay (80%). Seventy-four patients were hospitalized with 22 being admitted to the ICU. A total of 78 patients recovered while 39 patients died. This meta-analysis presents evidence to suggest vaccine-induced immune thrombotic thrombocytopenia (VITT) following AstraZeneca vaccine. Clinical practice must, therefore, account for the possibility of VITT and subsequent embolic events in certain individuals' postvaccination with adenovirus-based COVID-19 vaccines. Serum anti-PF4 suggests diagnostic value for VITT and could subsequently inform treatment choices in such instances. Blood Coagul Fibrinolysis 33:90-112

Rheumatoid arthritis (RA) is a chronic inflammatory rheumatic disease affecting multiple joints and can also be a systemic widespread, affecting major organs. Rheumatoid arthritis is associated with greater adverse maternal and neonatal outcomes in comparison to the general obstetric population. This systematic review and meta-analysis aims to investigate the pregnancy outcomes in RA patients in comparison to the general pregnant population.Nine studies involving 11,999 RA patients met the eligibility criteria with 9,921,808 controls. Rheumatoid arthritis patients were compared with their control counterparts according to random-effects model statistical analysis.We searched databases from inception to September 8, 2021. Eligible studies reported maternal outcomes (preeclampsia, cesarean delivery, and preterm delivery) and/or neonatal outcomes. Data were pooled across using random-effects model. Subgroup analysis was conducted on RA patients alone. The review was registered prospectively with PROSPERO (CRD42021250521).In terms of maternal outcomes, there was an increased rate of cesarean delivery (odds ratio [OR], 1.55), preeclampsia (OR, 1.61), and preterm delivery (OR, 1.83) in RA patients compared with their control counterparts. In terms of neonatal outcomes, a higher rate of lower gestational weight (mean difference [MD], −0.19 kg), requirement for neonate intensive care unit admission (OR, 1.34), and stillbirths (OR, 1.99) were observed in RA patients compared with the controls. A subgroup analysis of 4 studies involving only RA patients (n = 3761) was conducted. A total of 33.2% of patients had a cesarean delivery, 7.3% had preeclampsia, 14.8% had a preterm delivery, and 9.5% of neonates had low birth weight.Compared with the general pregnant population, women with RA tend to have a higher risk of maternal and neonatal complications. As a result, this study hopes to increase awareness into the importance of counseling and managing RA patients.

COVID-19 mRNA vaccinations have recently been implicated in causing myocarditis. Therefore, the primary aim of this systematic review and meta-analysis was to investigate the clinical characteristics of patients with myocarditis following mRNA vaccination. The secondary aims were to report common imaging and laboratory findings, as well as treatment regimes, in these patients. A literature search was performed from December 2019 to June 2022. Eligible studies reported patients older than 18 years vaccinated with mRNA, a diagnosis of myocarditis, and subsequent outcomes. Pooled mean or proportion were analyzed using a random-effects model. Seventy-five unique studies (patient n = 188, 89.4% male, mean age 18–67 years) were included. Eighty-six patients had Moderna vaccines while one hundred and two patients had Pfizer-BioNTech vaccines. The most common presenting symptoms were chest pain (34.5%), fever (17.1%), myalgia (12.4%), and chills (12.1%). The most common radiologic findings were ST-related changes on an electrocardiogram (58.7%) and hypokinesia on cardiac magnetic resonance imaging or echocardiography (50.7%). Laboratory findings included elevated Troponin I levels (81.7%) and elevated C-reactive protein (71.5%). Seven patients were admitted to the intensive care unit. The most common treatment modality was non-steroid anti-inflammatory drugs (36.6%) followed by colchicine (28.5%). This meta-analysis presents novel evidence to suggest possible myocarditis post mRNA vaccination in certain individuals, especially young male patients. Clinical practice must therefore take appropriate pre-cautionary measures when administrating COVID-19 mRNA vaccinations.