COVID-19 Infection in Heart Transplants in Pre- and Postvaccination Periods

BACKGROUND: Heart transplant (HTx) recipients constitute a group vulnerable to COVID-19 infection. Vaccination has been a turning point in the evolution of the pandemic. The objective was to analyze a series of HTx recipients with COVID-19 prior to vaccination and post vaccination. METHODS: Inclusion: All HTx recipients diagnosed with COVID-19 (February 2020 to April 2022). Exclusion: HTx younger than 16 years. They were subdivided into prevaccination period (February 2020 to February 2021) and postvaccination period (March 2021 to April 2022). They were classified into 3 groups according to severity. Group 1: mild symptoms without admission. Group 2: admission for nonsevere pneumonia. Group 3: severe pneumonia according to American Thoracic Society/Infectious Diseases Society of America criteria. The general therapeutic attitude before and after vaccination was similar in both groups. RESULTS: A total of 65 HTx recipients have had COVID-19 to date (10.7% of the 374 HTx recipients alive). In the prevaccination period, 22 HTx recipients presented the disease (Fig 1A): 27% in group 1; 59% were admitted for nonsevere pneumonia (group 2), with favorable evolution and a mean stay of 16 days; and 14% in group 3 (criteria for severe pneumonia), with 2 HTx recipients dying in this group. In the postvaccination period, 43 HTx recipients have presented COVID-19 (Fig 1B), 49% in group 1, 42% in group 2, and 9% in group 3. The hospital stay is slightly reduced to 15 days and 3 of the 4 patients in group 3 have died (mortality rate 7%). CONCLUSIONS: A significant number of HTx recipients have been affected by COVID-19, associating high mortality in severe forms both in the pre- and postvaccination period. In our series of patients, vaccination has reduced the percentage of hospitalization for nonsevere pneumonia slightly below the average hospitalization and mortality.