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Cardiovascular complications and outcomes among athletes with COVID-19 disease: a systematic review

Abstract

Background

Current evidence still emerging regarding the risk of cardiovascular (CV) sequel associated with coronavirus disease 2019 (COVID-19) infection, and considerable replicated studies are needed to ensure safe return-to-play. Therefore, we aimed in this systematic review to measure the prevalence of CV complications suffered by COVID-19 athletic patients, explore the outcomes, optimal approaches to diagnoses, and safe return-to-play considerations.

Methods

A systematic search on post COVID-19 infection quantitative studies among athletes was conducted following MeSH terms in Medline, Cochrane Library, Ovid, Embase and Scopus (through 15 January 2022). We included peer-reviewed studies reported athletes’ CV complications and the outcomes post COVID-19 infection. Editorials, letters, commentaries, and clinical guidelines, as well as duplicate studies were excluded. Studies involving non-athletic patients were also excluded. Quality assessment was performed using Newcastle–Ottawa Scale.

Results

We included 15 eligible articles with a total of 6229 athletes, of whom 1023 were elite or professional athletes. The prevalence of myocarditis ranged between 0.4% and 15.4%, pericarditis 0.06% and 2.2%, and pericardial effusion between 0.27% and 58%. Five studies reported elevated troponin levels (0.9-6.9%).

Conclusions

This study provides a low prevalence of CV complications secondary to COVID-19 infection in short-term follow-up. Early recognition and continuous assessment of cardiac abnormality in competitive athletes are imperative to prevent cardiac complications. Establishing a stepwise evaluation approach is critical with an emphasis on imaging techniques for proper diagnosis and risk assessment for a safe return to play.

Peer Review reports

Background

Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) has affected nearly 372,875,793 million people (as of 30 January 2022) worldwide since its outbreak in China in December 2019 [1]. COVID-19 affects the respiratory system and infected people usually experience a relatively mild course of symptoms such as fever, headache, cough, shortness of breath, and diarrhea [2]. However, severe infection manifests to the point of causing severe pneumonia and often progresses to acute respiratory distress syndrome (ARDS) [3].

COVID-19 is considered to be a multi-organ disease that could lead to a broad variety of clinical complications affecting multiple body systems, such as the cardiovascular (CV) system [4]. COVID-19 is associated with a range of CV complications, specific arrhythmias, myocardial injury, and other cardiovascular diseases, with potentially fatal outcomes in athletes and non- athletes [4, 5].

A study by Saurabh Rajpal and colleagues in 2020 used cardiac magnetic resonance to visualize the cardiac complications in 26 athletes who have recovered from COVID-19 infection. Among 26 athletes, 4 had cardiovascular magnetic resonance (CMR) imaging outcomes that were indicative of myocarditis, and 8 athletes displayed late gadolinium enhancement (LGE) without T2 elevation, indicative of pre-myocardial injury [6]. Emerging knowledge and cardiac imaging observations raised concerns of myocardial inflammation as an additional cause of cardiac damage from COVID-19. Therefore, practical recommendations have proposed a medical assessment tool that investigate the cardiorespiratory complications and the severity of illness suggesting a roadmap to exclude cardiorespiratory complications of COVID-19 in athlete [7]. Moreover, animal experiments have demonstrated that exercise can increase virus replication and inflammation inside the heart that is affected by myocarditis, resulting in irreversible injury or occasionally sudden death [7]. In addition to that, even within asymptomatic or mildly symptomatic patients, recent reports have raised questions about myocardial inflammation after recovery from COVID-19 [6]. However, the occurrence of myocarditis-induced arrhythmias is not known, and although COVID-19 has contributed to a rise in over 50% in the general population of hospital cardiac arrests, the data do not indicate a rise in the risk of sudden cardiac arrest or arrhythmias in otherwise healthy COVID-19 patients [7]. Even asymptomatic or relatively mild symptomatic COVID-19 patients show cardiac magnetic findings consistent with myocarditis myocardial inflammation [8]. The cardiac involvement in athletics with SARS-CoV-2 such as myocarditis manifests histologically with lymphocytic infiltrates, acute impairment of heart function, possibly residual chronic scarring with increased susceptibility to malignant ventricular arrhythmias and other cardiovascular diseases [4, 5]. We aimed to accumulate the available evidence concerning the post-recovery cardiac complications suffered by COVID-19 athletic patients.

Methods

Search strategy

We conducted a systematic literature search of online databases including in Medline, Cochrane Library, Ovid, Embase and Scopus for articles published between January 1st 2020 to January 28, 2022. Following Preferred Reporting Items for Systematic Reviews and Meta-analysis (PRISMA) guidelines (Fig. 1), we identified all articles that discussed post-recovery cardiac complications in COVID‐19 infected athletes. We searched for the following keywords as MeSH terms: “COVID‐19”, “coronavirus”, OR “SARS-CoV-2” in combination with terms “Myocarditis”, “Pericarditis”, “myopericarditis”, “heart failure”, “exercise”, “athletes”, “sport”, “post-recovery”, and “complications”.

A total of 491 records were identified through our systematic search. Duplicate results were removed. The remaining articles (n = 201) were screened for relevance by their title and abstracts by four authors (G.A, S.A, N.A and A.A). Disagreement during the inclusion and exclusion process, data extraction, and quality assessment was resolved by consensus or involvement of a fifth author (B.A). Seventy-six articles were assessed in full text for eligibility, of which 15 articles were included in this systematic review and identified as relevant.

Fig. 1
figure 1

PRISMA flow chart describing selection of studies included in the systematic review

Inclusion and exclusion criteria

After identifying 491 relevant articles by keywords through online databases search, 201 articles were removed because of duplication in different databases. Screening 290 articles by titles and abstracts reveled an exclusion of 143 articles for irrelevance to the scope of the review. Seventy-six articles were assessed in full text for eligibility and 61 articles were removed for one of the following reasons (1) studies using non original data e.g. editorials, narrative letters, narrative commentaries, and clinical guidelines; (2) studies that are not peer-reviewed; (3) studies involving non-athletic patients; (4) studies not reporting the CV complications and outcomes; or (5) studies not exploring approaches to diagnoses, and safe return-to-play considerations.

Quality assessment

The quality assessment of included studies was performed using the Newcastle–Ottawa Scale (NOS) for cohort and cross-sectional studies. The NOS is a reliable system used to measure biases in quantitative studies by using its star rating system.

Selected cohort studies were evaluated for the selection of study groups (0–4 stars), comparability for confounding factors (0–2 stars), and outcome of interest ascertainment (0–3 stars), with a maximum of 9 stars representing the highest methodological quality. Each of the included cross-sectional studies was evaluated for the selection of study sample (0–5 stars), comparability for confounding factors (0–2 stars), and outcome of interest ascertainment (0–3 stars), with a maximum of 10 stars indicating the highest methodological quality. Two authors independently conducted the quality assessment for each included study. Disagreements, if any, were discussed and resolved by the involvement of a third author to reach a final judgment.

Data extraction

Data extraction was conducted by two authors (I.F and B.A), we used standardized forms that include author, year, participants number, participants mean age, study setting, study design, COVID-19 status (intensity). The outcomes of interest were the diagnostic procedures and findings, CV complications, and recovery status among athletes with COVID-19 infection.

Review of relevant literature

Search results

Included studies comprised of 8 cross-sectional studies [6, 9,10,11,12,13,14,15], 6 cohort studies (5 studies were retrospective) [8, 16,17,18,19,20], and one case series study [21]. Amongst these 15 articles, nine were reported from the United States [6, 8,9,10,11, 13, 15, 19, 21], four articles from Italy [14, 17, 18, 20], one from Hungary [12], and one from Poland [16]. Seven articles were reported from elite or professional athletes [12, 14,15,16,17, 19, 20] and 8 from college athletes [6, 8,9,10,11, 13, 19, 21]. All the studies included are summarized in Table 1.

Table 1 Characteristics of included studies

Quality assessment

The study quality ratings from the modified Newcastle-Ottawa Scale are presented in Table 1. Of the 8 cross-sectional studies included in this review, 2 studies were deemed ‘good’ studies with a score of seven points [9, 10] and 5 study as satisfactory with a score of six points [6, 11, 13,14,15]. Two cohort studies were deemed ‘fair’ studies with a score of four points [17, 18], whereas the remaining 4 studies were regarded as ‘good’ [8, 16, 19, 20]. The quality issues identified in the ‘fair’ and ‘poor’ studies were due to lack of comparability items of control or inadequate comparators and absence of follow-up [17, 18]. In addition, the quality assessment for the case series study [21] was made “good” based on the overall judgement about the methodological quality tool suggested by Murad and colleagues [22].

Characteristics of the included studies

All of the included studies were published in 2021 and evaluated 6229 athletes infected with COVID-19 with sample sizes ranging from 12 to 3018. The mean ages of included subjects ranged from 19 to 25 years, and one study did not report participants’ age [18]. In all studies, no mortality data were reported.

COVID-19 diagnosis confirmation

Eight studies reported the use of Reverse transcriptase-polymerase chain reaction (PCR) for COVID-19 diagnosis [6, 9, 11, 16,17,18, 20, 21], another three studies used real-time PCR [12, 13, 15, 19], and three study did not indicate the method used for SARS-CoV-2 detection [8, 10, 14]. In addition to the PCR tests, five studies have tested serum IgG and IgM immune markers [9, 15, 17, 19, 20].

COVID-19 phase (assessment phase)

Thirteen studies were conducted after the recovery from COVID-19 infection [9, 10, 12,13,14,15,16,17,18,19,20,21], and 2 studies were conducted while the participants were infected [6.11].

Cardiac assessment

To assess CV complications, cardiac magnetic resonance imaging (MRI) was used in 14 studies [6, 8,9,10,11,12,13,14,15,16, 1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21], ECG in all studies [6, 8,9,10,11,12,13,14,15,16,17,18,19,20,21], echocardiography in eleven studies [6, 8,9,10,11,12,13,14,15, 17, 18, 20], cardiac enzyme (Troponin I or T) in fourteen studies [6, 8,9,10,11,12,13,14,15,16, 18,19,20,21], and Holter monitoring in five studies [10, 14, 17, 18, 20].

COVID-19 symptoms severity

The definition of severity was consistent among all included papers. Thirteen studies have reported symptoms severity [6, 8,9,10,11,12, 14,15,16,17, 19,20,21]. Out of these thirteen studies, two studies included patients with severe symptoms [16, 21] and four studies with moderate symptoms [9,10,11,12, 16, 19, 21]. Two study did not report symptom severity [13, 18].

Cardiovascular complications

Twelve studies have reported varied CV complications [6, 8,9,10,11, 13,14,15,16, 18, 19, 21]. Of which, six studies reported myocarditis with a prevalence range between 0.4% and 15.4% [6, 8, 13,14,15, 21], five study reported pericarditis [8, 10, 13,14,15] with a prevalence range between 0.06% and 2.2%. The prevalence of pericardial effusion was reported by nine studies and ranged between (0.27-58%) [6, 9, 11, 13,14,15,16, 18, 19], and Five studies reported elevated troponin levels (0.9-6.9%) [9, 11, 18, 19, 21]. The two studies conducted in Italy and Hungary among professional and elite players reported no CV complications were experienced among the players [12, 20].

Table 2 Summary of included studies and associated cardiac injury

Discussion

Varied cardiovascular complications were reported in all retrieved manuscripts including; myocarditis, pericardial effusion, effusive viral pericarditis, and myocardial edema. In hospitalized non-athlete patients, COVID-19 has been associated with myocarditis, myocardial fibrosis, pericarditis, and edema in 19.7% of patients, indicative of poor prognosis and a risk factor of in-hospital mortality [23]. However, Cardiovascular abnormalities have been found to be persistent, even after recovery, in 78% of COVID-19 symptomatic or asymptomatic athletes detected by standardized CMR [24]. The most common abnormality was myocarditis followed by regional scar and pericardial enhancement [24]. Another study by Saurabh Rajpal and colleagues demonstrated cardiac magnetic resonance (CMR) results in 26 athletes found CMR evidence of myocarditis in 4 COVID-19 survived patients (15%), and 8 athletes displayed LGE (30%) without T2 elevation indicative of pre-myocardial injury [6]. Indeed, a recent study indicated 2 out of 22 (9%) competitive athletes with COVID-19 suffered from myocardial inflammation or fibrosis after the course of disease [8]. These findings are of major concern since myocarditis in athletes is a major cause of sport-related SCD and can happen with a normal ventricular output [6]. Therefore, it is crucial to identify these abnormalities early in the course of the disease and to appropriately treat them [25].

Early recognition and continuous assessment of cardiac abnormality in competitive athletes are imperative to prevent cardiac complications. Athletes infected with COVID-19 may experience a range of symptoms and varied disease severity (Table 2), however, short-term illness may include sore throat, myalgia, shortness of breath, fever, while some were asymptomatic [6]. Post-recovery symptoms may include cough, tachycardia, severe fatigue, ventricular arrhythmias, and depression [7]. Following the athletes’ initial clinical evaluation, additional assessments may include specialized blood panel, resting electrocardiogram (ECG), 24-hour ECG, echocardiogram, cardiopulmonary exercise, and CMR imaging interpreted by a cardiology consultant [5]. Cardiac imaging (e.g. CMR) has been used for the indication of congestive heart failure, cardiac tamponade, and acute myocardial infarction (Table 2) following a variety of imaging techniques. On the other hand, the elevation of troponin in critically ill patients is an indicator of silent myocardial inflammation in up to 28% of patients [26]. In athletes, identification of this form of disease that remains long after the resolution of typical COVID-19 symptoms is important before the resumption of training and competition.

Establishing a stepwise evaluation approach is critical with an emphasis on imaging techniques for proper diagnosis and risk assessment for a safe return to play. COVID-19 remains to be an obstacle to both athletes and sports organizations. Therefore, a comprehensive evaluation approach and a safe return to sport plan are warranted (Table 3; Fig. 2). Assessing athletes returning to sports following COVID-19 remains challenging in providing the best medical advice based on clinical evidence. Prior to returning to athletic activity, Drezner and colleagues recommended a written medical clearance that assesses various factors to develop an appropriate return to sports plan [27]. This may include evaluation of signs and symptoms, a 12-lead ECG with a physical examination, exercise test, echocardiogram, CMR, HOLTER monitoring, and cardiac biomarkers [28]. Further pulmonary follow-up and testing may also be required which include chest radiograph, spirometry, oxygen saturation during exercise, chest CT, and other pulmonary tests [27]. Hospitalized athletes with myocardial injury may undergo specific screening tests, a cardiac complication monitoring plan, and a more comprehensive rehabilitation program for a safe return to athletic activities (Table 3; Fig. 2)

Table 3  A summary of diagnostic approaches indicating heart injury and their cardiac interpretation
Fig. 2
figure 2

Recommended timeline for a safe return to sport following COVID-19 infection in athletes

A 2-week home isolation is advised following testing positive for SARS-CoV-2 regardless of presence of symptoms [26]. Seven days’ post-recovery and clearance of symptoms, a gradual return to sports activity is advised with continuous monitoring of any cardiac abnormalities that may appear [29]. Four weeks’ post-infection, athletes are advised to undergo cardiac re-evaluation if experiencing debilitating illness or reduced performance, with an immediate halt to all sporting activities [26]. If myocarditis is confirmed, a more intensive monitoring with 3–6 months’ sports restriction is required [28].

Summary

Varied prevalence of cardiovascular complications were reported in all retrieved manuscripts including; myocarditis (0.4-15.4%), pericardial effusion (0.27-58%), pericarditis (0.06-2.2%), elevated troponin levels (0.9-6.9%) and myocardial edema. Early recognition of cardiac abnormality associated with myocarditis such as myocardial fibrosis, pericarditis, and edema are imperative to prevent sudden cardiac death in competitive athletes. For a safe return to athletic activities, COVID-19 remains to be an obstacle to both athletes and sports organizations. Therefore, a comprehensive evaluation approach and a safe return to sport plan are warranted.

Availability of data and materials

The datasets used and/or analyzed during the current study are available from the corresponding author on reasonable request.

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Acknowledgements

The authors would like to thank the Research Center at King Fahd Medical City, Riyadh, for their valuable help and support.

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The authors did not receive any financial support for this work.

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BA contributed to study design, data analysis, results discussion, and manuscript writing and review; Articles screening for relevance by their title and abstracts was conducted by four authors (GA, SA, NA and AA). Disagreement during the inclusion and exclusion process, data extraction, and quality assessment was resolved by consensus or involvement of a fifth author (BA). IA contributed to data analysis and manuscript writing; MAS performed results discussion and clinical interpretation; WA contributed to clinical analysis of data, results discussion, manuscript writing and review. All authors read and approved the final manuscript.

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Correspondence to Bandar Alosaimi.

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Alosaimi, B., AlFayyad, I., Alshuaibi, S. et al. Cardiovascular complications and outcomes among athletes with COVID-19 disease: a systematic review. BMC Sports Sci Med Rehabil 14, 74 (2022). https://doi.org/10.1186/s13102-022-00464-8

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Keywords

  • Cardiovascular
  • COVID-19
  • Athletes
  • Rehabilitation
  • Extrapulmonary