CRP and atrial fibrillation: Occurrence of a clinically manifest cardiovascular event in COVID-19 hospitalized patients from Hamburg was related to age (interquartile range 82 to 56 years; OR: 1.11, CI: (0.66–1.86), presence of atrial fibrillation at the baseline ECG (OR 3.43, CI: (1.74–6.77)), baseline systolic blood pressure (interquartile range 147 to 120 mmHg, OR 0.71, CI: (0.527–0.96)), baseline potassium (interquartile range 4.4 to 3.6 mmol/L; OR 1.31, CI: (0.9911–1.73)) and C-reactive protein values (interquartile range 118 to 26 mg/L; OR 1.35, CI: (1.04–1.76) (Figure 3A,B).