Serum creatinine to bilirubin ratio associated with essential hypertension.

Objective: Previous studies have shown that serum bilirubin (BIL) is significantly decreased, and serum creatinine (Cr) level is increased in patients with essential hypertension (EH). In this paper, the ratio of serum Cr to BIL was measured to explore whether the ratio was associated with EH risk.
Patients and Methods: 80 EH cases were selected as the observation group. 44 cases with normal blood pressure were selected as the control group. Serum Cr and BIL levels were detected, and the ratio values were calculated.
Results: Compared with the control group, the Cr to total bilirubin (TBIL) ratio (Cr/TBIL, CTR), Cr to direct bilirubin (DBIL) ratio (Cr/DBIL, CDR) and Cr to indirect bilirubin (IBIL) ratio (Cr/IBIL, CIR) in the EH group were significantly increased (p<0.05). Spearman correlation analysis showed that EH risk was positively correlated with CTR and CIR, while it was negatively correlated with serum BIL (p<0.05). The area under the ROC curve of CTR, CDR and CIR in diagnosing EH were 0.719 (95% CI: 0.631-0.796) (p<0.001), 0.700 (95% CI: 0.611-0.779) (p<0.001) and 0.716 (95% CI: 0.628-0.793) (p<0.001), respectively. Logistic regression analysis showed that CTR, CDR and CIR were independent risk factors for EH (CTR OR: 1.28, 95% CI: 1.11-1.48, p=0.0008), (CDR OR: 1.03, 95% CI: 1.003-1.067, p=0.032), (CIR OR: 1.17, 95% CI: 1.07-1.29, p=0.001).
Conclusions: CTR and CIR are positively correlated with the incidence of EH. With the increase of blood pressure, CTR and CIR increase. CTR and CIR are independent risk factors for the incidence of EH.