“We see that these adverse events are leading to very short and unremarkable hospital stays,” said Dr. Jeremy Faust, an emergency medicine physician at Brigham and Women’s Hospital in Boston who was not involved in the study. “The same can’t be said of hospitalizations for Covid-19 in this or any age group so far.”
“When people are hospitalized for Covid, the consequences are far more severe,” added Dr. Faust, who has compared rates of myocarditis following vaccination to those among Covid-19 patients.
The researchers, with the Providence health care system, evaluated medical records from 40 hospitals in Washington, Oregon, Montana and Los Angeles County, Calif.
They found that myocarditis developed a median of 3.5 days after vaccination, mostly after the second dose, and in people with a median age of 36 years. Three-quarters of the 20 cases were in men.
The 19 patients who were admitted to the hospital were discharged after a median of two days. About three weeks after vaccination, 13 patients had recovered from their symptoms and the remaining seven were improving.