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Don’t judge the book by its cover…

2021, Journal of Nephrology

A 61-year-old caucasian male patient undergoing peritoneal dialysis, contacted our Centre, frightened about the appearance of cloudy peritoneal effluent. His medical history was significant for chronic kidney disease secondary to AL systemic amyloidosis, ischemic heart disease, hypertension, dyslipidaemia. On admission the peritoneal fluid was markedly cloudy and yellowish (Fig. 1a). The patient reported no change in the peritoneal ultrafiltration. A stick of the effluent fluid was negative for leukocytes (Fig. 1b) and white cell count on peritoneal effluent showed 30 cells/ mmc. Peritoneal effluent and catheter exite site cultures and lab tests were performed. Even though the clinical suspicion of peritonitis was low, we eventually loaded the patient with a 2000 ml dwell cointaining glucose 1.36% heparin 2000 IU, gentamicin 16 mg and cefazolin 1000 mg. The results of the exams (Table 1) were all negative. During the medical examination the patient revealed that due to poor blood pr...

Journal of Nephrology (2021) 34:913–914 https://doi.org/10.1007/s40620-021-00980-9 ART IN THE WARD Don’t judge the book by its cover…. Ettore Pasquinucci2 · Vittoria Esposito1 · Giuseppe Sileno1 · Marco Colucci1 · Marta Arazzi1 · Ciro Esposito1,2 Received: 18 November 2020 / Accepted: 22 January 2021 / Published online: 8 March 2021 © The Author(s) 2021 Keywords Calcium channel blockers · Peritoneal dialysis · Cloudy effluent · Peritonitis · CKD A 61-year-old caucasian male patient undergoing peritoneal dialysis, contacted our Centre, frightened about the appearance of cloudy peritoneal effluent. His medical history was significant for chronic kidney disease secondary to AL systemic amyloidosis, ischemic heart disease, hypertension, dyslipidaemia. On admission the peritoneal fluid was markedly cloudy and yellowish (Fig. 1a). The patient reported no change in the peritoneal ultrafiltration. A stick of the effluent fluid was negative for leukocytes (Fig. 1b) and white cell count on peritoneal effluent showed 30 cells/ mmc. Peritoneal effluent and catheter exite site cultures and lab tests were performed. Even though the clinical suspicion of peritonitis was low, we eventually loaded the patient with a 2000 ml dwell cointaining glucose 1.36% heparin 2000 IU, gentamicin 16 mg and cefazolin 1000 mg. The results of the exams (Table 1) were all negative. During the medical examination the patient revealed that due to poor blood pressure control he had started taking lercanidipine (20 mg/ day) as suggested by his family doctor two days before the present admission. Peritoneal effluent lipids profile showed triglycerides 513 mg/dl, cholesterol 20 mg/dl, LDL 4 mg/dl. A diagnosis of lercanidipine-induced chyloperitoneum was made. Lercanidipine treatment was stopped and the peritoneal effluent fluid cleared in 24 h. In patients undergoing peritoneal dialysis the appearance of cloudy peritoneal effluent warrants the exclusion of infectious peritonitis. However, there are other rarer causes of opalescent peritoneal effluent [1]. Chyloperitoneum is defined by milky appearance of peritoneal fluid with elevated triglycerides content (usually > 200 mg/dl). This condition is generally caused by lymphatics obstruction secondary to trauma, cancer, cirrhosis, infections. Among iatrogenic causes calcium channel blockers and aliskiren have been implicated. Chyloperitoneum secondary to calcium channel blockers (CCB) has been described both in patients undergoing peritoneal dialysis and in general population [2]. Although our patient is Caucasian, the majority of cases of chyloperitoneum have been described in Asian patients and this may indicate an ethnic predisposition. No gender susceptibility has been found. The underlying mechanism is unclear but it is likely related to lymphatics dysfunction in triglycerides disposal through inhibition of smooth muscle activity of lymphatic vessels by CCB. Two recent systematic reviews on CCB-associated chyloperitoneum found that lercanidipine is the most common causative agent, with appearance of cloudy peritoneal dialysate within four days from drug initiation [3, 4]. Usually peritoneal fluid clears within 24–48 h after drug discontinuation. Although some reports have already been published and the reported incidence ranges from 13 to 57% and it is 12.5% in our center, CCB induced cloudy sterile effluent peritoneal fluid remains an unknown entity to many nephrologists. Furthermore patients on peritoneal dialysis are not always made aware of CCB as a cause of cloudy sterile peritoneal fluid and therefore the sight of the cloudy effluent generates a lot of distress [5]. Nephrologists awareness of CCB induced Chyloperitoneum may help rule out a diagnosis of peritonitis in asymptomatic patients presenting with sterile cloudy fluid having recently started CCB treatment, avoiding stressful situations to the patient and limiting invasive procedures and treatments. * Ciro Esposito [email protected] 1 Nephrology and Dialysis Unit, ICS Maugeri SpA SB, Pavia, Italy 2 Dept of Internal Medicine and Medical Therapy, University of Pavia, Via Maugeri 10, 27100 Pavia, Italy 13 Vol.:(0123456789) 914 Journal of Nephrology (2021) 34:913–914 Fig. 1 (A) Appearance of the peritoneal effluent. (B) Peritoneal effluent stick indicating absence of leukocytes (inset) Table 1 Results of blood and peritoneal effluent lab tests Parameter Result Reference range Creatinine Urea WBC Hb PLT C-reactive protein Total plasma cholesterol Plasma LDL Plasma triglycerides Peritoneal effluent WBC Peritoneal total cholesterol Peritoneal LDL Peritoneal triglycerides 8.99 mg/dl 124 mg/dl 7.55 109/l 12.5 g/dl 251 109/l < 0.1 mg/dl 127 mg/dl 64 mg/dl 97 mg/dl 0.03 109/l 20 mg/dl 4 mg/dl 513 mg/dl 0.7–1.2 18–55 4–10 14–18 150–450 0–0.5 0–199 0–99 0–149 Author contributions PE developed the idea and the manuscript framework. EV, SG and AM attended to the patient and followed up on his care at the Maugeri Hospital. CM wrote the first draft of the manuscript. EC developed the idea and did the final editing. All authors contributed to corrections of the manuscript. All authors approve and agree with the content. Funding The study is not funded by any grant or institution. Compliance with ethical standards Conflict of interest On behalf of all authors, the corresponding author states that there is no conflict of interest. Ethics approval and Informed Consent Verbal informed consent was obtained from the patient. 13 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/. References 1. Kim S, Yu YM, Kwon J, Yoo H, Jung SH, Lee E (2019) Calcium channel blocker-associated chyloperitoneum in patients receiving peritoneal dialysis: a systematic review. Int J Environ Res Public Health 16:1333–1338 2. Dossin T, Goffin E (2019) When the color of peritoneal dialysis effluent can be used as a diagnostic tool. Semin Dial 32:72–79 3. Tzao YT, Chen WL (2009) Calciun channel blocker-induced chylous ascites in peritoneal dialysis. Kidney Int 75:868 4. Tsai MK, Lai CH, Chen LM, Jong GP (2019) Calcium channel blocker-related chylous ascites: a systematic review and metaanalysis. J Clin Med 8:466–473 5. Campbell DJ, Craig JC, Mudge DW, Brown FG, Wong G, Tong A (2016) Patient’s perspective on the prevention and treatment of peritonitis in peritoneal dialysis: a semi-structured interview study. Perit Dial Int 36:631–639 Publisher’s Note Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.