Hyperleptinaemia and chronic inflammation after peritonitis predicts poor nutritional status and mortality in patients on peritoneal dialysis.
BACKGROUND
The serum leptin level is elevated in patients undergoing peritoneal dialysis (PD) and associated with a loss of lean body mass. The nutritional status of PD patients may further be worsened following peritonitis. We investigated the association between hyperleptinaemia, inflammation and malnourishment in PD-related peritonitis.


METHODS
We conducted a prospective study on PD patients who developed peritonitis. Blood samples were obtained as baseline (D0) before the onset of peritonitis, and once peritonitis developed, leptin, adiponectin (ADPN) and other inflammatory markers were collected, on day 1 (D1), day 7 (D7) and day 42 (D42) of peritonitis. Patients were followed-up for any censor event or 1 year after peritonitis.


RESULTS
Forty-two patients with a mean age of 62.9+/-13.2 years were recruited. Fourteen (33.3%) were diabetic. The serum leptin levels increased significantly from baseline to day 1 and 7, but fell back to the premorbid state at day 42. In contrast, the ADPN level decreased from a baseline value of 15.60+/-10.4 microg/ml to 13.01+/-8.1 microg/ml on day 1 (P=0.01) but rose to 14.39+/-8.9 microg/ml on day 7 (P=0.28) and 13.87+/-7.9 microg/ml on day 42 (P=0.21). High-sensitivity C-reactive protein (hs-CRP) increased significantly from baseline to day 1, 7 and even at day 42. The lean body mass (LBM) and nutritional markers decreased significantly after peritonitis. For patients with high hs-CRP (>3.0 mg/l) at day 42, there was a higher mortality rate than for those with lower hs-CRP (<3.0 mg/l, P=0.02), even if they were in clinical remission of peritonitis.


CONCLUSIONS
Our study confirmed an increase in serum leptin during acute peritonitis and a prolonged course of systemic inflammation after apparent clinical remission of peritonitis. These factors related to the persistent chronic inflammation may contribute to the development of malnourishment and poor survival rate.
Lam
Man Fai
MF
Department of Medicine, University of Hong Kong, Queen Mary Hospital, NO 102, Pokfulam Road, Hong Kong.
Leung
Joseph C K
JC
Lo
Wai Kei
WK
Tam
Sidney
S
Chong
Mei-ching
MC
Lui
Sing Leung
SL
Tse
Kai Chung
KC
Chan
Tak Mao
TM
Lai
Kar Neng
KN
D052242:Adiponectin / Q000097:blood; D000368:Aged; D002097:C-Reactive Protein / Q000378:metabolism; D002908:Chronic Disease; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D007249:Inflammation / Q000097:blood / Q000209:etiology*; D015850:Interleukin-6 / Q000097:blood; D007676:Kidney Failure, Chronic / Q000401:mortality* / Q000628:therapy; D020738:Leptin / Q000097:blood*; D008297:Male; D008875:Middle Aged; D010530:Peritoneal Dialysis; D010538:Peritonitis / Q000097:blood* / Q000150:complications*; D011237:Predictive Value of Tests; D011379:Prognosis; D011446:Prospective Studies; D011502:Protein-Energy Malnutrition / Q000175:diagnosis / Q000209:etiology*; D014409:Tumor Necrosis Factor-alpha / Q000097:blood
D052242:Adiponectin; D015850:Interleukin-6; D020738:Leptin; D014409:Tumor Necrosis Factor-alpha; D002097:C-Reactive Protein