<p>Limited knowledge and variability in findings exist regarding the resolution of cardiovascular outcomes following Multisystem Inflammatory Syndrome in Children (MIS-C). We conducted a systematic review to estimate the frequency of cardiovascular outcomes following MIS-C. A systematic search was conducted in Pubmed/Medline, Scopus, Embase, SciELO, LILACS, Cochrane Library, Web of Science, and medRxiv were searched up to February 2024. We included studies reporting cardiovascular events that began in acute MIS-C and persisted after discharge. Screening and data extraction were performed by independent reviewers. We performed a random-effects meta-analysis and assessed the certainty of the evidence using the GRADE approach. Eighty-four studies (<i>n</i> = 4,778) were included; seven had a comparator group. The frequency of cardiovascular outcomes—including coronary abnormalities (Z-score ≥ 2), left ventricle ejection fraction &lt; 55%, diastolic dysfunction, myocarditis, and pericardial effusion—decreased over time, with most resolving by 6 to 9&#xa0;months. However, cardiac magnetic resonance imaging studies identified myocardial edema and/or fibrosis persisting up to 12&#xa0;months, and two studies reported coronary abnormalities at 18- to 24-month follow-up. Evidence certainty was very low. Compared to children with COVID-19 or healthy controls, MIS-C showed more cardiovascular events and greater subclinical myocardial dysfunction, as assessed by strain analysis, during a 6-month follow-up. Compared with other etiologies of myocarditis, MIS-C myocarditis was associated with better cardiovascular outcomes but shorter exercise duration and lower aerobic capacity on stress testing. <i>Conclusions</i>: Cardiovascular outcomes following MIS-C improved over time, but certain subclinical cardiac abnormalities persisted up to 12 to 24&#xa0;months. These findings may support long-term follow-up after MIS-C.</p><p><i>Trial registration</i>: Protocol registration number: PROSPERO, CRD42022336784.</p>

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Post-MIS-C cardiovascular outcomes: a systematic review

  • Giancarlo Alvarado-Gamarra,
  • Katherine Alcala-Marcos,
  • Carlos R. Celis,
  • Pía Balmaceda-Nieto,
  • Luigi Cieza,
  • Cristian Morán-Mariños,
  • Pamela Grados-Espinoza,
  • Carlos Alva-Díaz,
  • Lucie Ecker,
  • Theresa J. Ochoa,
  • Luis Miguel Franchi,
  • Leigh M. Howard,
  • Carlos G. Grijalva,
  • Claudio F. Lanata

摘要

Limited knowledge and variability in findings exist regarding the resolution of cardiovascular outcomes following Multisystem Inflammatory Syndrome in Children (MIS-C). We conducted a systematic review to estimate the frequency of cardiovascular outcomes following MIS-C. A systematic search was conducted in Pubmed/Medline, Scopus, Embase, SciELO, LILACS, Cochrane Library, Web of Science, and medRxiv were searched up to February 2024. We included studies reporting cardiovascular events that began in acute MIS-C and persisted after discharge. Screening and data extraction were performed by independent reviewers. We performed a random-effects meta-analysis and assessed the certainty of the evidence using the GRADE approach. Eighty-four studies (n = 4,778) were included; seven had a comparator group. The frequency of cardiovascular outcomes—including coronary abnormalities (Z-score ≥ 2), left ventricle ejection fraction < 55%, diastolic dysfunction, myocarditis, and pericardial effusion—decreased over time, with most resolving by 6 to 9 months. However, cardiac magnetic resonance imaging studies identified myocardial edema and/or fibrosis persisting up to 12 months, and two studies reported coronary abnormalities at 18- to 24-month follow-up. Evidence certainty was very low. Compared to children with COVID-19 or healthy controls, MIS-C showed more cardiovascular events and greater subclinical myocardial dysfunction, as assessed by strain analysis, during a 6-month follow-up. Compared with other etiologies of myocarditis, MIS-C myocarditis was associated with better cardiovascular outcomes but shorter exercise duration and lower aerobic capacity on stress testing. Conclusions: Cardiovascular outcomes following MIS-C improved over time, but certain subclinical cardiac abnormalities persisted up to 12 to 24 months. These findings may support long-term follow-up after MIS-C.

Trial registration: Protocol registration number: PROSPERO, CRD42022336784.