From:  Long-term cardiovascular sequelae of COVID-19 in patients with pre-existing heart failure: a systematic review

 Summary of prognostic effect estimates (HR and RR) for key outcomes in patients with pre-existing HF.

Outcome/ComparisonEffect estimate typeValue (95% confidence interval)Adjusted variablesReference
All-cause mortality/MACE (vaccinated vs. unvaccinated)aHR0.59 (0.55–0.63)Age, sex, comorbidities, HF duration[38, 43, 44]
Readmission risk (HFrEF vs. HFpEF)RR1.4 (1.2–1.7)Baseline LVEF, age, BMI[33, 34]
Arrhythmia detection (telemonitoring vs. standard care)HR29.56 (7.1–123.0)Clinical risk score, renal function[45]
HF-related events (COVID-19 vs. influenza cohort)Fold increase (RR/HR)1.6–2.1-fold higherAge, comorbidities, race[27, 41]
New-onset hypertension (risk for CV events)aHR1.57 (1.35–1.81)Age, sex, HF severity[28]

AF: atrial fibrillation; aHR: adjusted hazard ratio; BMI: body mass index; COVID-19: coronavirus disease 2019; CV: cardiovascular; HF: heart failure; HFpEF: heart failure with preserved ejection fraction; HFrEF: heart failure with reduced ejection fraction; HR: hazard ratio; LVEF: left ventricular ejection fraction; MACE: major adverse cardiovascular events; RR: relative risk.