Myocarditis following rAd26 and rAd5 vector-based COVID-19 vaccine: case report.

SARS-CoV-2 vaccines provide a safe solution with a major impact on reducing the spread of the virus and mild side effects. Research has shown rare cases of myocarditis after mRNA vaccines. This study presents a 29-year-old male with chest pain after 48 h of receiving rAd26 and rAd5 vector-based COVID-19 vaccine (Sputnik V vaccine). The electrocardiogram revealed ST-segment elevation. Also, the laboratory screening was remarkable for elevated cardiac Troponin-I level, and leukocytosis; and echocardiography depicted severe left ventricular systolic dysfunction. Overall, endomyocardial biopsy proved lymphocytic myocarditis such that the patient was successfully treated with immunosuppressive and guideline-directed medical treatment.

Introduction

Following the outbreak of the COVID‐19 pandemic, many efforts have been made to produce an effective vaccine to control the disaster. The vaccination programme against SARS‐CoV‐2 started in early December 2020 and has had a significant impact on reducing the spread of the virus and mortality. , Although vaccines are safe, technical workgroups of COVID‐19 vaccine safety should assess vaccine safety data since the start of the vaccination programme.

Meanwhile, few cases of myocarditis after mRNA COVID‐19 vaccines have been reported. To the best of our knowledge, there is not any report of myocarditis after the rAd26 and rAd5 vector‐based COVID‐19 vaccines. Collaboration between infectious diseases, cardiology, and rheumatology specialists is needed to guide diagnosis, treatment, and management of myocarditis. Although most cases of myocarditis post‐COVID‐19 vaccine appear to be mild, follow‐up of cases seems necessary.

This report presents a case of myocarditis after the second dose of the heterologous rAd26 and rAd5 vector‐based COVID‐19 vaccine (Sputnik V COVID‐19 vaccine) in a previously healthy 29‐year‐old man.

Case report

A 29‐year‐old man presented to the Emergency Department with chest pain and generalized malaise. He was restless from the chest pain and described it as a feeling of pressure on his chest that worsens by inspiration. Two days earlier, he received the second dose of the Sputnik V COVID‐19 vaccine. He was previously well, and his medical history was unremarkable. He did not drink alcohol or use illicit drugs. During the examination, he was afebrile and had a heart rate of 110 b.p.m., blood pressure of 95/60 mmHg, and oxygen saturation of 95% on room air. The heart rhythm was sinus tachycardia, and S3 was noted on auscultation. The jugular venous pressure was 5 cm of water. Vesicular breath sounds were heard in all lung fields. The patient had no swelling in his legs, and the remainder of the examination was unremarkable. An electrocardiogram (ECG) showed ST‐segment elevation in precordial leads (V3–V4) (Figure ). He was admitted to the cardiac care unit with a stable condition with no need for vasopressors, mechanical ventilators, or circulatory support. The peak Troponin‐I level was 3.04 ng/mL (normal range: <0.02 ng/mL), white blood cell count of 13 500 per , and normal C‐reactive protein and erythrocyte sedimentation rate. In addition, two PCR of swabs taken from his upper respiratory tract returned negative for SARS‐CoV‐2 (Table ). Meanwhile, the chest radiograph did not show any abnormal findings related to pneumonia, abscess, pulmonary oedema, lung masses, cavitary lung lesions, pleural effusion, or any other abnormalities. Echocardiography indicated normal left ventricular (LV) size with global hypokinesia, LV ejection fraction (LVEF) of 30–35%, and increased LV wall thickness (12 mm). Also, the right ventricular systolic function was mildly impaired (Supporting Information, ). No result was noticed regarding the presence of pericardial effusion. In addition, coronary angiography was pursued due to ST‐segment elevation in the ECG, high Troponin‐I, concern for the thrombotic acute coronary syndrome, and revealed patent epicardial coronary arteries with a slow flow of the left anterior descending artery.

Figure 1

An electrocardiogram showed ST‐segment elevation in precordial leads.

Table 1

Laboratory data

Variable	Values	Reference range
Haemoglobin (g/dL)	18.6	14.0–17.5
Haematocrit (%)	55.8	41.5–50.4
White cell count (per mm^3)	13 500	4000–11 000
Platelet count (per mm^3)	230 000	150 000–450 000
Sodium (mEq/L)	136	135–145
Potassium (mEq/L)	4.2	3.5–5.5
Urea nitrogen (mg/dL)	28	10–50
Creatinine (mg/dL)	0.9	0.9–1.3
Glucose (mg/dL)	94	70–100
Troponin‐I (ng/mL)	3.04	<0.02
Calcium	8.3	8.6–10.3
Albumin (g/dL)	4.3	3.8–5.1
N‐terminal pro‐B‐type natriuretic peptide (pg/mL)	320	<120
d‐Dimer (ng/mL)	340	Negative <500
ESR (mm/h)	5	1–25
CRP (mg/L)	8	Up to 5
Lactate dehydrogenase	240	225–500

CRP, C‐reactive protein; ESR, erythrocyte sedimentation rate.

Table presents the results of right heart catheterization. Due to the high suspicion of myocarditis, endomyocardial biopsy as the gold standard diagnostic test was performed during the angiography. Five tissue samples were taken from the right ventricular septum using Cordis bioptome with a long sheath via right femoral vein access. Next, it was placed in 10% buffered formalin for histopathology survey and immunohistochemistry staining. Eventually, one sample was sent in a sterile Falcon tube for virology. Histopathological examination of endomyocardial biopsy specimens showed lymphocytic infiltration compatible with lymphocytic myocarditis (Figure ). However, biopsy samples for viral PCR were detected negative for severe acute respiratory syndrome coronavirus 2 (SARS‐CoV‐2) and other viruses including Cytomegalovirus, Adenovirus, Human Herpes Virus‐6 (HHV6), Parvovirus B19, Enterovirus, and Influenza A/B viruses. Moreover, serum PCR testings for coxsackievirus, hepatitis C virus, and human immunodeficiency virus were negative.

Table 2

Right heart catheterization data

Variable	Values
Cardiac output, Fick method (L/min)	4.6
Cardiac index (L/min/m2)	2.4
Pulmonary artery pressure (mean) (mmHg)	18/10 (12.6)
Right ventricular pressure (mmHg)	18/0–5
Mean right atrium pressure (mmHg)	4
Pulmonary vascular resistance (Woods)	0.5
Systemic vascular resistance (Woods)	18.5
Systemic oxygen saturation (%)	95
Mixed venous oxygen saturation (%)	79

Figure 2

Histopathological examination of endomyocardial biopsy specimens showed lymphocytic infiltration, compatible with lymphocytic myocarditis.

With the diagnosis of lymphocytic myocarditis, the immunosuppressive treatment was initiated with methylprednisolone, prednisolone, and mycophenolate mofetil. Also, a guideline‐directed medical treatment was followed for heart failure in combination with enalapril, carvedilol, and spironolactone.

After 2 days of immunosuppressive therapy, the LVEF improved to 50–55% (Supporting Information, ), there was no chest pain, and serial troponins continued to fall such that it was <0.02 ng/mL at the time of discharge. Finally, the patient was discharged 7 days after admission. Post‐hospital discharge follow‐up for 4 months did not show any illnesses and echocardiography, and follow‐up magnetic resonance imaging showed normal cardiac function.

Discussion

COVID‐19 is a clinical syndrome caused by SARS‐CoV‐2 that primarily involves the respiratory system and is associated with cardiovascular features of myocardial involvement, including elevated serum troponin levels, myocarditis, and acute heart failure. Although the prevalence of myocarditis in COVID‐19 is unclear, a meta‐analysis of autopsy studies by Halushka and Vander Heide suggests many cases at autopsy reporting non‐specific inflammatory infiltrates may not be acute myocarditis. According to these authors, the incidence of acute myocarditis may be <2%. Therefore, myocarditis was probably not the cause of death in these patients. The pathophysiology of COVID‐19‐related myocarditis is thought to be a combination of cardiac damage due to the host's immune response and direct SARS‐CoV‐2 injury.

The literature shows no report of myocarditis after injecting rAd26 and rAd5 vector‐based COVID‐19 vaccines (Gam‐COVID‐Vac). Although we found some reports of acute myocarditis after administration of the second dose BNT162b2 vaccine against COVID‐19, the definitive aetiological diagnosis was difficult to determine without evidence of myocardial inflammation in the endomyocardial biopsy. Sputnik V is the world's first registered vaccine, and it has been approved for use in 71 countries with a total population of 4 billion people. The number of the Sputnik V vaccine doses ordered worldwide as of March 2021 was 765 million, and about 800 000 doses have been injected in Iran. Here, we report a case of myocarditis in a 29‐year‐old male who had no underlying medical conditions before the event. The symptoms started about 48 h after he received the second dose of the Sputnik V COVID‐19 vaccine. These symptoms started shortly after the vaccination and raised the suspicion that an immunological reaction may have caused the lymphocytic myocarditis. This vaccine is a heterologous adenoviral vector‐based vaccine against SARS‐CoV‐2 designed with two recombinant adenovirus vectors. According to an interim analysis of a randomized controlled phase 3 trial in Russia, the Sputnik V vaccine is safe and well tolerated. After injecting this vaccine, the most common adverse event was pain at the injection site, hypothermia, headache, and muscle and joint pain. ,

Myocarditis is an extremely rare phenomenon that has been reported infrequently following the vaccine administration of influenza, smallpox, and the human papillomavirus. Generally, it is hard to explain the underlying mechanism because of its rarity. , , Because SARS‐CoV‐2 mortality is high around the world, the development of a vaccine is an urgent task. Vaccination will restrict the spread of COVID‐19 and reduce mortality. Given the abundant benefits of the COVID‐19 vaccine, and the low incidence of clinically significant complications, we encourage immunization with vaccination. According to the myocarditis following the COVID‐19 vaccine, ongoing surveillance is required to evaluate the occurrence of rare adverse events. Therefore, clinicians should be vigilant to provide prompt diagnosis and treatment for this purpose.

Ethics approval

All procedures performed in studies involving human participants were following the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.

Informed consent

Informed consent was obtained from the individual participant included in the study.

Conflict of interest

The authors declare that they have no conflict of interest.

Funding

This study was not supported by any funding.

Video S1. Supporting Information

Video S2. Supporting Information

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