Digestive Pathologies during Chronic Renal Failure in the Nephrology and Haemodialysis Department at the University Hospital Center of Point G in Mali

Introduction: Chronic kidney disease (CKD) is the progressive and irreversible loss of kidney function. It exposes to many complications, among which, digestive complications. In Mali, we do not have data on the prevalence of digestive pathologies in people with chronic renal failure, hence the interest of this study. Objective: To determine the prevalence of digestive pathologies and to describe their manifestations during chronic renal failure. Patients and Methods: This was a prospective cross-sectional study conducted from September 2016 to August 2017, a period of 12 months. Included were patients hospitalized in our department with CKD who received digestive endoscopy and/or liver serology. Results: Seventy-one patients underwent digestive endoscopy with oesogastroduodenal fibroscopy (60 patients), rectoscopy (6 patients) and anoscopy (5 patients), i.e. 15.9% of those hospitalized. The mean age of the patients was 48 ± 14 years with extremes of 15 and 84 years. The sample consisted of 59.2% men versus 40.8% women, for a sex ratio of 1.5. The functional signs are in order of frequency: vomiting (72.4%), anorexia (51.3%) and epigastralgia (48.7%). Terminal CKD by creatinine clearance accounted for 88.2% of cases, of which 47.4% were monitored by hemodialysis. Hepatitis C virus infection was present in 21.3% of cases, hepatitis B (18%) and HIV (7.5%). Endoscopic examinations were represented by fibroscopy (84.5%), rectoscopy (8.5%) and anuscopy (7%). The fibroscopic lesions were respectively gastric (96.8%), duodenal (14.1%) and esophageal (12.5%). They were dominated by gastritis (40.5%), duodeno-gastric reflux (16.4%), pyloric gap (12.6%). Rectoscopy found 4 cases of hemorrhoids, 2 cases of rectitis and no lesions were observed at anuscopy. Conclusion: The prevalence of these digestive manifestations and the endoscopic lesions encountered indicate the importance of digestive endoscopy and the performance of hepatic serologies in chronic renal failure patients with digestive symptoms and/or treated by hemodialysis.


Introduction
Chronic kidney disease (CKD) is the progressive and irreversible loss of kidney function. It results from the reduction of functional renal parenchyma. Its diagnosis is based on a decrease in glomerular filtration rate (GFR), which results in a progressive increase in plasma creatinine concentrations [1] [2]. It exposes to many complications, among which, digestive complications. Patients with CKD often have digestive manifestations, the frequency of which increases with the severity of the CKD [3].
There is a change in gastric secretion which may be related to the observed digestive lesions. According to some authors, the frequency of these lesions has halved since the advent of anti-secretory drugs [4] [5].
The prevalence of digestive lesions observed in a study conducted by Sawadogo N in Burkina Faso in the Yalgado Ouédraogo National Hospital Center (CHNYO) in 2002 [6] was 72.9%, Ahmed [7] in Pakistan and Kochhar [8] in India found 68.3% and 68% of patients with digestive lesions respectively. These digestive complications aggravate the symptoms of renal failure and often contribute to its accutisation due to potentially nephrotoxic therapeutics and undernutrition.
In Mali, we do not have data on the prevalence of digestive pathologies in patients with chronic renal failure, hence the interest of this study.
Objective: To determine the prevalence of digestive pathologies and to describe their manifestations during chronic renal failure.

Patients and Methods
This was a prospective cross-sectional study conducted from September 2016 to August 2017, a period of 12 months. Included were patients with chronic renal failure who were hospitalized in the nephrology and hemodialysis department, consented and had undergone digestive endoscopy and/or liver serology.
Patients with non-consensual CKD and/or incomplete medical records were excluded. Medical records and patient survey forms were used for data collection. The variables studied were: • Socio-demographic data, • The reason(s) for hospitalization, • The patient's personal and collateral history, • The data from the physical examination, • Paraclinical examination data.
Ethical consideration: the free and informed consent of each participant in the study or one of his close relatives was obtained with strict respect for the anonymity of the survey form.
The data entry and statistical analysis were carried out using Word 2007 and SPSS 20 French version. The Chi 2 t-test was used for the entire study, values of p < 0.05 were considered significant.

Results
During the study period, 478 patients were hospitalised in the Nephrology and haemodialysis department of CHU Point G, 71 of whom benefited from digestive endoscopy using oesogastroduodenalfibroscopy (60 patients), rectoscopy (6 patients) and anoscopy (5 patients Table 1). The frequency of anaemia was 98.7% with a mean Hb level of 7.6 g/dl with extremes of 3.5 g/dl and 12.2 g/dl, it was severe (haemoglobin level less than 6 g/dl) in 23.7%. Hypocalcaemia is observed in 84.2% of cases.
Gastritis was the dominant lesion with 40.7%.    The rate of viral infection increases with the stage of kidney failure. X 2 = 6.18; ddl = 4; P = 0.51.

Discussion
Study Limitations: Patients whose general condition did not allow for GI endoscopy and who did not perform liver serology and those who did not consent were not included in the study. These have contributed to the reduction of our workforce. The mean age of the patients was 48 ± 14 years with extremes of 15 and 84 years. The 50 -70 age group was the most represented with 43.4% of patients. In the literature, Varma [9] in India, David etcollaborateurs [10] in the USA, Rey et collaborateurs [11] in France, Gary and Zuckerman in the USA [12] reported an average age in 42.26, 43.1, 50.1 and 57 years respectively. Low life expectancy, socio-economic conditions, diet and the high frequency of predisposing pathologies (hypertension, diabetes) could also explain this difference. The sample was composed of 59.2% men versus 40.8% women, for a sex ratio of 1.5. This male dominance is classic in literature [9] [11] [13]. It may be explained by a higher incidence of kidney disease and its more rapid progression to end-stage renal disease in men [14]. Impaired renal function accounted for 90.8% of the reasons for consultation. In Côte d'Ivoire Diallo A found MTA as the reason for consultation (40.83%), followed by alteration in general condition (12.23%) [15]. Thefunctional signs are in order of frequency: vomiting (72.4%), anorexia (51.3%) and epigastralgia (48.7%). In Burkina Fasso, Lengani et al. reported vomiting in 63% of patients [16]. The high frequency of vomiting and anorexia in our study could be explained by the severity of CKD. Reported in the literature, vomiting may be secondary to or induce hydroelectrolytic disorders (hyponatremia), creating a vicious circle with aggravation of impaired renal function. It can therefore be seen that functional digestive signs such as nausea, vomiting and anorexia become more frequent as the CKD progresses. This observation has been made by other authors Varma and Rey [9] [11]. The prevalence of hepatitis B and C in haemodialysis patients varies from country to country but remains higher than in the general population (HCV: 2.7-22.2% in the DOPPS registry). In our series the seroprevalence of hepatitis C is high at 18.1% but remains lower than that reported in other Moroccan studies (53.3% in Rabat and 78% in Casablanca) [17] [18], and that of HbsAg at 15.3% with a range of 1.63% to 15% provided by the literature. These prevalences can be explained by the age of dialysis, multiple blood transfusions, nosocomial transmission through non-compliance with individual and collective hygiene rules and the alteration of the immune defences induced by chronic renal failure. The prevalence of HIV infection was very low, in our series the risk of transmission of HIV infection from one patient to another was almost zero subject to strict hygiene rules. Digestive endoscopy was pathological in 84.3% of the patients studied. Ahmed in Pakistan [7] and Kochhar [8] reported 68.3% and 68% of pathological endoscopies respectively.
Endoscopic lesions in order of frequency were gastric (96.8% of patients), followed by duodenal (14.1% of patients) and esophageal (12.5% of patients). This predominance of gastric lesions has been found by other authors, Varma [9], Rey [11], on the other hand, it was duodenal in the study of Kochhar [8]. These lesions could be explained by the increased acid secretion in the gastric and duodenal tracts of patients with chronic renal failure [19]. The incidence of esophageal fungal infections was 3.8%. In the literature, it has been observed that esophageal mycoses can complicate certain medical conditions including CKD. In our study, HIV infection could explain the high frequency of esophageal mycoses (P = 0.009).

Conclusion
The prevalence of these digestive manifestations and the endoscopic lesions encountered indicate the importance of digestive endoscopy and the performance of liver serology in patients with chronic renal failure presenting digestive symptoms and/or treated by hemodialysis.