In the chronic heart failure group, the factors associated with an agreement between antibiotic prescription in the ED and referral (hospitalization) were being male, having a fever, and having a CRP level above 100 mg/L, with an OR of 2.12 [95% CI 1.02–4.42], 2.34 [95% CI 1.06–5.17], and 0.33 [95% CI 0.16–0.71], respectively (Figure 4). This evidence concerns the gene CRP and congestive heart failure.