Salivary and Serum Biochemical Analysis from Patients with Chronic Renal Failure in Hemodialysis: A Cross-Sectional Study

Ingrid Morgana Fernandes  Gonçalves; Marília Barbosa  Pessoa; Arlley de Sousa  Leitão; Gustavo Pina  Godoy; Cassiano Francisco Weege  Nonaka; Pollianna Muniz  Alves

Authors

Ingrid Morgana Fernandes Gonçalves
Marília Barbosa Pessoa
Arlley de Sousa Leitão
Gustavo Pina Godoy
Cassiano Francisco Weege Nonaka
Pollianna Muniz Alves

Keywords:

Kidney Failure, Chronic, Renal Insufficiency, Chronic, Calcium, Creatinine, Saliva

Abstract

Objective: To compare salivary and serum biochemical levels in patients with chronic renal failure undergoing hemodialysis. Material and Methods: The sample was composed of 57 patients treated in Hemodialysis Reference Centers, from a state of Northeastern Brazilian, with age ≥21 years old with at least 3 months of hemodialysis treatment time. Serum data were obtained from records. Unstimulated and stimulated saliva were collected. Flow rate (mL/min) was measured. Spectrophotometry was performed for the measurement of salivary levels of calcium (570 nm), urea (340 nm), and creatinine (510 nm). Statistical analysis used Mann Whitney and Kruskal-Wallis tests (p<0.05). Results: Unstimulated and stimulated salivary flow rates were 0.43 mL/min and 1.69 mL/min, respectively. There was significant difference (p<0.001) of levels of calcium (5.41 mg/dL and 9.70 mg/dL), urea (118.03 mg/dL and 183.22 mg/dL) and creatinine (0.59 mg/dL and 9.20 mg/dL) between saliva and serum, respectively. Concerning the time of hemodialysis, salivary and serum calcium not exhibited significant association; however, serum urea (p=0.012) and serum creatinine (p=0.025) showed significant association to the time of hemodialysis. Conclusion: Salivary biochemical levels of urea, creatinine and calcium can indicate the presence of a possible chronic renal failure and the saliva demonstrated to be a potential auxiliary biofluid for clinical monitoring renal alterations.

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