Cardiovascular complications of COVID-19 vaccines: A review of case-report and case-series studies

Cardiac symptoms in patients 3-6 months after contracting COVID-19- data from the polish STOP-COVID registry

BACKGROUND

Common complaints of long COVID patients are cardiac symptoms such as fatigue, weakness, and a feeling of palpitations. The study aimed to investigate the clinical features of patients with persistent cardiological symptoms occurring within 3 to 6 months after COVID-19. Differences in ambulatory blood pressure monitoring (ABPM), Holter ECG (electrocardiogram) and Echocardiography between people with and without persistent cardiological symptoms were evaluated. We also assessed whether the symptoms of anxiety and depression may be implicated in the clinical outcomes.

MATERIALS AND METHODS

This was a retrospective study of patients affiliated with the STOP-COVID registry who attended a follow-up visit 3-6 months after undergoing COVID-19. The visit assessed the clinical symptoms present and performed tests: ABPM, Holter ECG and Echocardiography. 504 patients additionally had GAD-2 (Generalized Anxiety Disorder 2-item) and PHQ-2 (Patient Health Questionnaire-2) tests performed.

RESULTS

The analysis included 1080 patients. At least 1 of the analyzed symptoms was present in 586 patients (54.3%). The most common symptom was fatigue (38.9%). Comparing patients with or without palpitations showed that the mean value of ventricular extrasystole was higher in the former group (p = 0.011). Comparing patients with and without cardiac symptoms, there were differences in the mean values of the PHQ-2 (p = 0.022) and GAD-2 (p < 0.001) scales, as well as in the percentage of responses related to the risk of anxiety or depression.

CONCLUSION

Cardiological symptoms are common among health issues that patients must face after contracting COVID-19. People with palpitations had more excessive ventricular extrasystoles than patients without these symptoms.

TRIAL REGISTRATION

Our retrospective study was based on analysis of medical data of patients with COVID-19 treated on out-patient basis in the STOP-COVID registry of the Polish Long-Covid Cardiovascular (PoLoCOV-CVD) study (ClinicalTrials.gov identifier- NCT05018052, the registration date 29.05.2020). Consent to conduct the study was obtained from the Bioethics Committee of the District Medical Chamber in Lodz (no. KB-0115/2021).

Cardiovascular Sequelae of the COVID-19 Vaccines

Vaccines against COVID-19 present a key tool in lowering the morbidity, mortality, and transmission of the disease, but they also present a strongly controversial topic. As a result, the adverse effects of the vaccine have been under scrutiny by the public eye. A comprehensive summary of the cardiovascular (CV) adverse effects of COVID-19 vaccines is vital for clinical recognition of rare adverse events, determining the public health implications, and creating a base for future research. In May 2023, a search was conducted in the PubMed and Cochrane databases to identify literature on CV complications resulting from the COVID-19 vaccine. All articles with relevant data and discussion regarding adverse effects of the COVID-19 vaccines were included in the review. In total, 4419 articles were screened, and 166 articles were included in the review. The vaccine-associated CV adverse events encompassed the following conditions: myocarditis, pericarditis, acute coronary syndrome, stress cardiomyopathy, hypertension, isolated tachycardia, myocardial infarction (MI) with nonobstructive coronary arteries (MINOCA), cardiac arrest, vaccine-induced thrombotic thrombocytopenia (VITT), MI, cerebral venous thrombosis (CVT), deep vein thrombosis (DVT), pulmonary embolism (PE), and other venous thrombotic disorders. Among these, myocarditis and thrombosis, especially VITT, emerged as the most frequently cited complications in the reviewed literature. Ranges of incidences for the following were recorded among the reviewed articles: myocarditis: 2 to 17 per million, VITT: 3-10 per million, CVST: 2.6-10 per million, MI: 3-4 per million. COVID-19 vaccines entail the potential for adverse events, although at low incidence, some of which exhibit notable severity. These adverse events exhibit demographic specificity and vaccine-specific profiles. The adverse events reviewed are uniformly acute in nature. The existing body of evidence offers limited support for the assertion that COVID-19 vaccines may elevate the baseline risk of CV events in the long term. However, the available research on effects greater than six months is scarce.

SARS-CoV-2 vaccination influence in the development of long-COVID clinical phenotypes

Although SARS-CoV-2 vaccination reduces hospitalization and mortality, its long-term impact on Long-COVID remains to be elucidated. The aim of the study was to evaluate the different development of Long-COVID clinical phenotypes according to the vaccination status of patients. Clinical and demographic characteristics were assessed for each patient, while Long-COVID symptoms were self-reported and later stratified into distinct clinical phenotypes. Vaccination was significantly associated with the avoidance of hospitalization, less invasive respiratory support, and less alterations of cardiopulmonary functions, as well as reduced lasting lung parenchymal damage. However, no association between vaccination status and the development of at least one Long-COVID symptom was found. Nevertheless, clinical phenotypes were differently associated with vaccination status, as neuropsychiatric were more frequent in unvaccinated patients and cardiorespiratory symptoms were reported mostly in vaccinated patients. Different progression of disease could be at play in the different development of specific Long-COVID clinical phenotypes, as shown by the different serological responses between unvaccinated and vaccinated patients. A higher anti-Spike (S) antibody titre was protective for vaccinated patients, while it was detrimental for unvaccinated patients. A better understanding of the mechanism underlying the development of Long-COVID symptoms might be reached by standardized methodologies and symptom classification.

Association of SARS-CoV-2 immunoserology and vaccination status with myocardial infarction severity and outcome

BACKGROUND

The COVID-19 pandemic adversely affected the severity and prognosis of patients with acute myocardial infarction (MI) caused by atherothrombosis (type 1 MI). The effect, if any, of COVID-19 vaccination and natural SARS-CoV2 serologic immunity in these patients is unclear. Our aim was to analyze the association between the severity and outcome of patients with type 1 MI and their previous SARS-CoV2 vaccination and serostatus.

METHODS

A single-center retrospective cohort study conducted between March 1, 2020 and March 1, 2023. Clinical and follow-up information was collected from medical records and patients. Total antibodies (IgM, IgA, IgG) to nucleocapsid (N) antigens were measured by ECLIA (electrochemiluminescence-based immunoassay) to test the immune response to natural infection. If positive, IgM and IgG antibodies to spike (S) surface antigens were measured by CLIA to test the immune response to vaccine or natural infection. Multivariable logistic regression analysis was performed, adjusting for age, sex, hypertension, diabetes, and dyslipidemia.

RESULTS

Total sample of 949 patients, 656 with ST-segment elevation MI (STEMI) and 293 with non-ST-segment elevation MI (NSTEMI). Mean age was 64 (SD 13) years, 80 % men. Pre-admission vaccination status was: ≥ 1 dose, 53 % of patients; complete vaccination, 49 %; first booster dose, 25 %. The majority (84 %) of vaccines administered were mRNA-based. Six months after MI, 92 (9.7 %) patients had a major adverse cardiac event (MACE) and 50 died; 11 % of patients had severe heart failure or cardiogenic shock (Killip III-IV) after STEMI. Vaccinated patients with STEMI and positive serology (Pos/Vax group) had a higher risk of Killip III-IV on admission: OR 2.63 (1.27-5.44), p = 0.010. SARS-CoV-2 S-specific IgG titers were highest in this group (median > 2080 AU/mL, [IQR 1560- >2080] vs 91 [32-198] in the unvaccinated group). In the overall sample, a higher incidence of 6-month MACE was not demonstrated (OR 1.89 [0.98-3.61], p = 0.055).

CONCLUSIONS

The combination of vaccination and natural SARS-CoV2 infection was associated with the development of severe heart failure and cardiogenic shock in patients with STEMI, possibly related to an increased serological response.

Emerging complications in the era of COVID-19 vaccination: role of radiologists and imaging

COVID-19 was declared as a pandemic by the World Health Organization (WHO) in March 2020. The COVID-19 pandemic became a major public health burden with a high morbidity and mortality rate. In response to the pandemic, several COVID-19 vaccines were introduced to prevent infection and control the transmission of the virus. These vaccines have proven to be effective and relatively safe causing mild side effects in most individuals. However, these vaccines have also been associated with rare but life-threatening complications involving multiple body systems including the pulmonary, cardiovascular, lymphatic, vascular, gastrointestinal, and the central and peripheral nervous systems. This article describes the various severe complications and highlights the role of radiologists and imaging in aiding the prompt recognition of vaccine associated complications allowing for improved patient management.

Analysis of immunological and biochemical parameters after booster dose vaccination using protein-based and inactivated virus vaccine for safety

Introduction

Heterologous vaccines enhance the immune response to new variants and allow flexibility in booster administration when the original vaccine is unavailable. Studies show that heterologous boosters can generate comparable or superior antibody responses compared to homologous boosters. Considering rare side effects is essential in evaluating COVID-19 vaccines, especially those associated with ChAdOx1-S (AstraZeneca) and Ad26.COV2.S (Janssen), including blood clotting and idiopathic thrombocytopenia. Severe side effects, such as myocarditis and pericarditis, may occur after Pfizer or Moderna boosters but are rare.

Methods

This study administered two vaccines: the Sinopharm inactivated virus vaccine and the Razi-CoV-Pars (RCP) booster. Various evaluations included biochemical markers, coagulation factors, autoimmune antibodies, and antibodies against concerning variants.

Results

All 90 participants exhibited a notable rise in antibody levels against the variant of concern (VOC). Participants receiving the Razi-CoV-Pars booster after Sinopharm/BBIBP-CorV showed significantly higher antibody levels (Wuhan ∼ 3.25 times, Delta ∼4 times, Omicron ∼ 14 times) compared to those receiving Sinopharm's homologous vaccine. No significant changes (P: <0.05) were found in LDH, CPK, CK-MB, ANA, and Anti-CCP levels. However, individuals receiving Sinopharm's booster after two doses showed a significant increase (4 cases) in D-Dimer levels.

Conclusion

The Razi-CoV-Pars vaccine demonstrates a favorable safety profile and promising potential as an effective booster against current variants, particularly due to its significant protective titer against Omicron.

Cardiac adverse drug reactions to COVID-19 vaccines. A cross-sectional study based on the Europe-wide data

AIMS

We aimed to analyse serious cardiac adverse drug reactions to COVID-19 vaccines from the Europe-wide EudraVigilance database.

METHODS AND RESULTS

In this retrospective, cross-sectional study, the EudraVigilance database was searched to identify suspected serious cardiac post-vaccination adverse drug reactions to COVID-19 vaccines. This data was coupled with the number of total vaccine doses administered in the European Economic Area for Comirnaty (Pfizer BioNTech), Spikevax (Moderna), Vaxzevria (AstraZeneca), Jcovden (Janssen), Nuvaxovid (Novavax), products, available from the European Centre for Disease Prevention and Control 'Vaccine Tracker' database. The analysis included 772 228 309 administered doses of eligible vaccines from the 'Vaccine Tracker' database and 86 051 eligible records of cardiac adverse drug reactions from the EudraVigilance database. The frequency of most of the investigated adverse drug reactions was very rare (<1/10 000 i.e. <100/1 000 000 doses). The lowest risk of any serious cardiac adverse drug reactions was noticed for vaccination with Comirnaty (135.5 per million doses), while Spikevax, Jcovden, Vaxzevria, and Nuvaxovid were characterized by higher risk (respectively, 140.9, 194.8, 313.6, and 1065.2 per million doses). The most common complications of vaccinations included syncope, arrhythmia, tachycardia, palpitations, angina pectoris, hypertension, myocarditis, thrombosis, and pulmonary embolism.

CONCLUSION

The risk of serious cardiac adverse drug reactions to COVID-19 vaccines is low and the benefit of active immunization against that disease seems to outweigh the potential risk of serious post-vaccination cardiac adverse drug reactions.

COVID-19 vaccine updates for people under different conditions

SARS-CoV-2 has caused global waves of infection since December 2019 and continues to persist today. The emergence of SARS-CoV-2 variants with strong immune evasion capabilities has compromised the effectiveness of existing vaccines against breakthrough infections. Therefore, it is important to determine the best utilization strategies for different demographic groups given the variety of vaccine options available. In this review, we will discuss the protective efficacy of vaccines during different stages of the epidemic and emphasize the importance of timely updates to target prevalent variants, which can significantly improve immune protection. While it is recognized that vaccine effectiveness may be lower in certain populations such as the elderly, individuals with chronic comorbidities (e.g., diabetes with poor blood glucose control, those on maintenance dialysis), or those who are immunocompromised compared to the general population, administering multiple doses can result in a strong protective immune response that outweighs potential risks. However, caution should be exercised when considering vaccines that might trigger an intense immune response in populations prone to inflammatory flare or other complications. In conclusion, individuals with special conditions require enhanced and more effective immunization strategies to prevent infection or reinfection, as well as to avoid the potential development of long COVID.

Levels of high-sensitive troponin T and mid-regional pro-adrenomedullin after COVID-19 vaccination in vulnerable groups: monitoring cardiovascular safety of COVID-19 vaccination

Background

COVID-19 vaccines are well tolerated and effective but may have adverse effects on the cardiovascular system. Vaccine-associated myocardial injury was analysed by measuring high-sensitive troponin T (hsTnT); mid-regional pro-adrenomedullin (MR-proADM) levels were evaluated to assess endothelial dysfunction.

Methods

This was a prospective study with a vulnerable population of healthcare workers (HCWs) and elderly patients (>70 years) who were vaccinated with either one dose of ChAdOx1 nCov-19 adenoviral vector vaccine (AZ) followed by one dose of the BNT162b2 messenger RNA vaccine (BNT), or with two doses of BNT (12th of January - 30th of November 2021). HsTnT and MR-proADM were measured in blood samples at three visits (V1: 1st immediately before vaccination; V2, 3: 3-4 weeks after 1st and 2nd vaccination). HsTnT of HCWs was compared to a healthy reference population.

Results

N = 162 volunteers were included (V1 = 161; V2, V3 = 162 each). N = 74 (45.7%) received AZ/BNT and n = 88 (54.3%) received BNT/BNT [elderly: n = 20 (12.3%), HCWs: n = 68 (42.0%)]. Median hsTnT levels were 4 ng/L, 5 ng/L and 4 ng/L (V1-V3) for AZ/BNT and at 5 ng/L, 6 ng/L and 6 ng/L (V1-V3) for BNT/BNT. Compared to the reference population (n = 300), hsTnT was significantly higher at all visits for both vaccination groups (p < 0.01), without differences between the AZ/BNT and BNT/BNT cohort. Median MR-proADM values were 0.43 nmol/L, 0.45 nmol/L, 0.44 nmol/L (V1-V3) in the AZ/BNT cohort and 0.49 nmol/L, 0.44 nmol/L, 0.47 nmol/L for BNT/BNT, respectively. Change of median hsTnT and MR-proADM between visits did not show significant increases. One HCW experienced a permanent and three a transient hsTnT increase ≥14 ng/L.

Conclusion

No overall subtle, persistent cardiovascular involvement was observed after the 2nd COVID-19 vaccination. Elevated cardiovascular biomarkers in clinically asymptomatic individuals need further investigations.

Systematic Review: Safety and Efficacy of mRNA COVID-19 Vaccines in Pregnant Women

Since pregnant women were excluded from clinical trials for vaccines against SARS-CoV-2, the novel coronavirus disease 2019 (COVID-19), there is limited data on the safety and efficacy of vaccines in this population. This systematic review explored the safety and efficacy of mRNA vaccines in pregnant women. A literature search was performed using Ovid databases through November 2021 for all studies evaluated efficacy and safety of mRNA COVID-19 vaccines in pregnant women. A total of five studies including 42,782 women were included in the systematic review. Humoral immunity to COVID-19 was detected in pregnant women who received the vaccine and no differences found in spike-specific T-cell responses. Incidence of high-grade chronic villitis is higher in the unvaccinated group with adjusted odds ratio of .31 (.1-.97), P < .05. Vaccination in pregnant women resulted in 12.6% spontaneous abortions (SAB) with 92.3% occurring in the first trimester, .1% stillbirth (>20 weeks gestation), 9.4% preterm birth (<37 weeks gestation), and 2.2% congenital abnormalities. The mRNA COVID-19 vaccines are immunogenic in pregnant women and no obvious safety concerns observed. There is no increased incidence of adverse reactions in pregnant women. Our finding supports that pregnant women should receive the vaccination at their earliest convenience regardless of trimester.

Incidence and management of the main serious adverse events reported after COVID-19 vaccination

Coronavirus disease 2019 (COVID-19) caused by the severe acute respiratory syndrome coronavirus 2n first appeared in Wuhan, China in 2019. Soon after, it was declared a pandemic by the World Health Organization. The health crisis imposed by a new virus and its rapid spread worldwide prompted the fast development of vaccines. For the first time in human history, two vaccines based on recombinant genetic material technology were approved for human use. These mRNA vaccines were applied in massive immunization programs around the world, followed by other vaccines based on more traditional approaches. Even though all vaccines were tested in clinical trials prior to their general administration, serious adverse events, usually of very low incidence, were mostly identified after application of millions of doses. Establishing a direct correlation (the cause-effect paradigm) between vaccination and the appearance of adverse effects has proven challenging. This review focuses on the main adverse effects observed after vaccination, including anaphylaxis, myocarditis, vaccine-induced thrombotic thrombocytopenia, Guillain-Barré syndrome, and transverse myelitis reported in the context of COVID-19 vaccination. We highlight the symptoms, laboratory tests required for an adequate diagnosis, and briefly outline the recommended treatments for these adverse effects. The aim of this work is to increase awareness among healthcare personnel about the serious adverse events that may arise post-vaccination. Regardless of the ongoing discussion about the safety of COVID-19 vaccination, these adverse effects must be identified promptly and treated effectively to reduce the risk of complications.

Rapid and Scalable Production of Functional SARS-CoV-2 Virus-like Particles (VLPs) by a Stable HEK293 Cell Pool

At times of pandemics, such as the severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) infection, the situation demands rapid development and production timelines of safe and effective vaccines for delivering life-saving medications quickly to patients. Typical biologics production relies on using the lengthy and arduous approach of stable single-cell clones. Here, we used an alternative approach, a stable cell pool that takes only weeks to generate compared to a stable single-cell clone that needs several months to complete. We employed the membrane, envelope, and highly immunogenic spike proteins of SARS-CoV-2 to produce virus-like particles (VLPs) using the HEK293-F cell line as a host system with an economical transfection reagent. The cell pool showed the stability of protein expression for more than one month. We demonstrated that the production of SARS-CoV-2 VLPs using this cell pool was scalable up to a stirred-tank 2 L bioreactor in fed-batch mode. The purified VLPs were properly assembled, and their size was consistent with the authentic virus. Our particles were functional as they specifically entered the cell that naturally expresses ACE-2. Notably, this work reports a practical and cost-effective manufacturing platform for scalable SARS-CoV-2 VLPs production and chromatographic purification.

1-L Transcription of SARS-CoV-2 Spike Protein S1 Subunit

The COVID-19 pandemic prompted rapid research on SARS-CoV-2 pathogenicity. Consequently, new data can be used to advance the molecular understanding of SARS-CoV-2 infection. The present bioinformatics study discusses the "spikeopathy" at the molecular level and focuses on the possible post-transcriptional regulation of the SARS-CoV-2 spike protein S1 subunit in the host cell/tissue. A theoretical protein-RNA recognition code was used to check the compatibility of the SARS-CoV-2 spike protein S1 subunit with mRNAs in the human transcriptome (1-L transcription). The principle for this method is elucidated on the defined RNA binding protein GEMIN5 (gem nuclear organelle-associated protein 5) and RNU2-1 (U2 spliceosomal RNA). Using the method described here, it was shown that 45% of the genes/proteins identified by 1-L transcription of the SARS-CoV-2 spike protein S1 subunit are directly linked to COVID-19, 39% are indirectly linked to COVID-19, and 16% cannot currently be associated with COVID-19. The identified genes/proteins are associated with stroke, diabetes, and cardiac injury.

Acute abdomen following COVID-19 vaccination: a systematic review

Purpose

Conduct a systematic review of case reports and case series regarding the development of acute abdomen following coronavirus disease 2019 (COVID-19) vaccination, to describe the possible association and the clinical and demographic characteristics in detail.

Materials and Methods

This study included case report studies and case series that focused on the development of acute abdomen following COVID-19 vaccination. Systematic review studies, literature, letters to the editor, brief comments, and so forth were excluded. PubMed, Scopus, EMBASE, and Web of Science databases were searched until June 15, 2023. The Joanna Briggs Institute tool was used to assess the risk of bias and the quality of the study. Descriptive data were presented as frequency, median, mean, and standard deviation.

Results

Seventeen clinical case studies were identified, evaluating 17 patients with acute abdomen associated with COVID-19 vaccination, which included acute appendicitis (n=3), acute pancreatitis (n=9), diverticulitis (n=1), cholecystitis (n=2), and colitis (n=2). The COVID-19 vaccine most commonly linked to acute abdomen was Pfizer-BioNTech (messenger RNA), accounting for 64.71% of cases. Acute abdomen predominantly occurred after the first vaccine dose (52.94%). All patients responded objectively to medical (88.34%) and surgical (11.76%) treatment and were discharged within a few weeks. No cases of death were reported.

Conclusion

Acute abdomen is a rare complication of great interest in the medical and surgical practice of COVID-19 vaccination. Our study is based on a small sample of patients; therefore, it is recommended to conduct future observational studies to fully elucidate the underlying mechanisms of this association.

Association of Cardiovascular Events with COVID-19 Vaccines Using Vaccine Adverse Event Reporting System (VAERS): A Retrospective Study

BACKGROUND

COVID-19 vaccines have played a crucial role in reducing the burden of the global pandemic. However, recent case reports have indicated the association of the COVID- 19 vaccines with cardiovascular events but the exact association is unclear so far.

OBJECTIVE

Therefore, the objective of the current study is to find out the association of cardiovascular events with COVID-19 vaccines.

METHODS

The COVID-19 Vaccine Knowledge Base (Cov19VaxKB) tool was used to query the Vaccine Adverse Event Reporting System (VAERS) database. The proportional reporting ratio [PRR (≥2)] with associated chi-squared value (>4), and the number of cases > 0.2% of total reports, was used to assess the association of COVID-19 vaccines with cardiovascular events.

RESULTS

A total of 33,754 cases of cardiovascular events associated with COVID-19 vaccines were found in the Cov19VaxKB tool. The cases were observed in different age groups (18-64, and 65 years and above) and gender. The disproportionality measures indicate a statistically significant association between cardiovascular events and COVID-19 vaccines.

CONCLUSION

The current study identified a signal of various cardiovascular events with the COVID-19 vaccines. However, further causality assessment is required to confirm the association.

Pre-treatment with galectin-1 attenuates lipopolysaccharide-induced myocarditis by regulating the Nrf2 pathway

Galectin-1 (Gal-1), a member of a highly conserved family of animal lectins, plays a crucial role in controlling inflammation and neovascularization. However, the potential role of Gal-1 in preventing myocarditis remains uncertain. We aimed to explore the functions and mechanisms of Gal-1 in preventing myocarditis. In vivo, C57/BL6 mice were pre-treated with or without Gal-1 and then exposed to lipopolysaccharide (LPS) to induce myocarditis. Subsequently, cardiac function, histopathology, inflammation, oxidative stress, and apoptosis of myocardial tissues were detected. Following this, qRT-PCR and Western blotting were applied to measure iNOS, COX2, TXNIP, NLRP3 and Caspase-1 p10 expressions. In vitro, H9c2 cells pre-treated with different doses of Gal-1 were stimulated by LPS to induce myocarditis models. CCK8, flow cytometry and reactive oxygen species (ROS) assay were then employed to estimate cell viability, apoptosis and oxidative stress. Furthermore, Nrf2 and HO-1 protein expressions were evaluated by Western blotting in vivo and in vitro. The results showed that in vivo, Gal-1 pre-treatment not only moderately improved cardiac function and cardiomyocyte apoptosis, but also ameliorated myocardial inflammation and oxidative damage in mice with myocarditis. Furthermore, Gal-1 inhibited TXNIP-NLRP3 inflammasome activation. In vitro, Gal-1 pre-treatment prevented LPS-induced apoptosis, cell viability decrease and ROS generation. Notably, Gal-1 elevated HO-1, total Nrf2 and nuclear Nrf2 protein expressions both in vivo and in vitro. In conclusion, pre-treatment with Gal-1 exhibited cardioprotective effects in myocarditis via anti-inflammatory and antioxidant functions, and the mechanism may relate to the Nrf2 pathway, which offered new solid evidence for the use of Gal-1 in preventing myocarditis.

Cardiovascular Complications of COVID-19: A Scoping Review of Evidence

This scoping review sought to identify the nature and extent of clinical evidence regarding the acute and long-term cardiovascular complications associated with COVID-19. Forty-nine studies published between 2020 and 2023 were selected for review. The studies were divided into two groups. The referential group included 22 studies. The second group of 27 studies was used for a detailed review to assess the strength of the evidence. The aggregate evidence indicates that the most common cardiac complications associated with COVID-19 include but are not limited to acute pericarditis, acute myocardial injury, acute myocarditis, various arrhythmias, microvascular angiopathy, left ventricular dysfunction, heart failure, acute cardiac injury, and acute coronary syndrome. Clinical and epidemiological implications of the findings are investigated, and future research recommendations are proposed.

COVID-19 Vaccination and Cardiac Arrhythmias: A Review

PURPOSE OF REVIEW

In this review, we aim to delve into the existing literature, seeking to uncover the mechanisms, investigate the electrocardiographic changes, and examine the treatment methods of various cardiac arrhythmias that occur after administration of the COVID-19 vaccine.

RECENT FINDINGS

A global survey has exposed an incidence of arrhythmia in 18.27% of hospitalized COVID-19 patients. Furthermore, any type of COVID-19 vaccine - be it mRNA, adenovirus vector, whole inactivated, or protein subunit - appears to instigate cardiac arrhythmias. Among the cardiac adverse events reported post-COVID-19 vaccination, myocarditis emerges as the most common and is thought to be a potential cause of bradyarrhythmia. When a patient post-COVID-19 vaccination presents a suspicion of cardiac involvement, clinicians should perform a comprehensive history and physical examination, measure electrolyte levels, conduct ECG, and carry out necessary imaging studies. In our extensive literature search, we uncovered various potential mechanisms that might lead to cardiac conduction abnormalities and autonomic dysfunction in patients who have received the COVID-19 vaccine. These mechanisms encompass direct viral invasion through molecular mimicry/spike (S) protein production, an escalated inflammatory response, hypoxia, myocardial cell death, and the eventual scar/fibrosis. They correspond to a range of conditions including atrial tachyarrhythmias, bradyarrhythmia, ventricular arrhythmias, sudden cardiac death, and the frequently occurring myocarditis. For treating these COVID-19 vaccination-induced arrhythmias, we should incorporate general treatment strategies, similar to those applied to arrhythmias from other causes.

P. G, Goyal D, Malhotra RK, Mishra P, Shukla M, Gupta A, Kohli V, Bundela N, Batra V, Bansal A, Yadav R, Yusuf J, Mukhopadhyay S. Impact of COVID-19 vaccination on mortality after acute myocardial infarction

BACKGROUND

COVID-19 vaccines are highly immunogenic but cardiovascular effects of these vaccines have not been properly elucidated.

OBJECTIVES

To determine impact of COVID-19 vaccination on mortality following acute myocardial infarction (AMI).

METHODS

This was a single center retrospective observation study among patients with AMI enrolled in the the North India ST-Elevation Myocardial Infarction (NORIN-STEMI) registry. In all the enrolled patients, data regarding patient's vaccination status including details on type of vaccine, date of vaccination and adverse effects were obtained. All enrolled subjects were followed up for a period of six months. The primary outcome of the study was all-cause mortality both at one month and at six months of follow-up. Propensity-weighted score logistic regression model using inverse probability of treatment weighting was used to determine the impact of vaccination status on all-cause mortality.

RESULTS

A total of 1578 subjects were enrolled in the study of whom 1086(68.8%) were vaccinated against COVID-19 while 492(31.2%) were unvaccinated. Analysis of the temporal trends of occurrence of AMI post vaccination did not show a specific clustering of AMI at any particular time. On 30-day follow-up, all-cause mortality occurred in 201(12.7%) patients with adjusted odds of mortality being significantly lower in vaccinated group (adjusted odds ratio[aOR]: 0.58, 95% CI: 0.47-0.71). Similarly, at six months of follow-up, vaccinated AMI group had lower odds of mortality(aOR: 0.54, 95% CI: 0.44 to 0.65) as compared to non-vaccinated group.

CONCLUSIONS

COVID-19 vaccines have shown to decrease all-cause mortality at 30 days and six months following AMI.

COVID-19 Vaccines and Myocarditis: An Overview of Current Evidence

COVID-19 vaccines have been widely used to reduce the incidence and disease severity of COVID-19. Questions have lately been raised about the possibility of an association between COVID-19 vaccines and myocarditis, an inflammatory condition affecting the myocardium, or the middle layer of the heart. Myocarditis can be caused by infections, immune reactions, or toxic exposure. The incidence rate of myocarditis and pericarditis was calculated to be 5.98 instances per million COVID-19 vaccine doses delivered, which is less than half of the incidences after SARS-CoV-2 infection. Myocarditis rates in people aged 12 to 39 years are around 12.6 cases per million doses following the second dose of mRNA vaccination. Adolescent men are more likely than women to develop myocarditis after receiving mRNA vaccines. The objectives of this systematic review and meta-analysis are to find out how often myocarditis occurs after receiving the COVID-19 vaccine, as well as the risk factors and clinical repercussions of this condition. Nevertheless, the causal relationship between vaccination and myocarditis has been difficult to establish, and further research is required. It is also essential to distinguish between suggested cases of myocarditis and those confirmed by endomyocardial biopsy.