title: Changes in erythrocyte calcium and potassium in patients during HD and CAPD.
abstract: The purpose of this study was to determine the changes in calcium and potassium content in the red blood cells (RBC) of uremic patients during a hemodialysis (HD) session and a 6/hrs CAPD exchange. RBC calcium and potassium were determined in 20 patients on HD in three blood samples collected at 0'-HD (pre-HD), 45'-HD and 240'-HD (end-HD), in 20 patients on CAPD, in two blood samples, collected at 0' time (pre-inflow) and 120', (solution in peritoneal cavity) during a 6/hrs exchange (4 exchanges / 24 h) and in 20 normal subjects. The mean value (+/-SD) of RBC calcium in controls was 15.6+/-3.75 micromol/L, in hemodialysed patients at 0'-HD, 45'-HD and 240'-HD 51.5+/-8.5, 70.4+/-12.5 and 51.1+/-10 micromol/L respectively and CAPD patients at time 0' and 120 of an exchange 53.6+/-23.4 and 70.6+/-9.2 respectively. These values show that RBC calcium in hemodialysed patients is generally significantly higher (p < 0.0001) than in controls. The value at 45'-HD is also significantly higher (p < 0.0001) than at 0' or 240'-HD. In CAPD patients, at 0' and 120' of a 6/hrs exchange, it is significantly higher (p < 0.0001) than in controls, as is the value at 120' (p < 0.001) in comparison to 0'. The mean value (+/-SD) of RBC potassium at the aforementioned time measurements were 95.9+/-3.34, 92.5+/-4.32 and 93.85+/-3.89 mmol/L respectively for patients on HD, 95+/-3.3 and 94.6+/-5.28 mmol/L respectively for patients on CAPD and 99.1+/-3.70 mmol/L in controls. These values show that RBC potassium of hemodialysed patients is significantly lower in comparison to that of controls (0'-HD: p < 0.01, 45'-HD and 240'-HD: p < 0.001); also the value at 45'-HD and 240'-HD is significantly lower (p < 0.001, p < 0.01 respectively) when compared to that at 0'-HD. In patients on CAPD, at 0' time and 120' during 6/hrs exchange, potassium is significant lower (p < 0.001) in comparison to that of controls. In conclusion, uremic patients present high erythrocyte calcium and low potassium with fluctuation during HD-sessions and CAPD 6/hrs exchange.
authors.affiliation: Department of Nephrology, Aretaieon University Hospital and Renal Clinic, Hippocration General Hospital, Athens, Greece.
authors.forename: A
authors.initials: A
authors.lastname: Paraskevopoulos
authors.forename: B
authors.initials: B
authors.lastname: Agroyannis
authors.forename: L
authors.initials: L
authors.lastname: Kopelias
authors.forename: E
authors.initials: E
authors.lastname: Tzanatos
authors.forename: A
authors.initials: A
authors.lastname: Tsomi
authors.forename: A
authors.initials: A
authors.lastname: Dalamanga
authors.forename: S
authors.initials: S
authors.lastname: Katsoudas
authors.forename: D
authors.initials: D
authors.lastname: Petras
authors.forename: S
authors.initials: S
authors.lastname: Voudiclari
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D002118:Calcium / Q000032:analysis* / Q000097:blood; D004912:Erythrocytes / Q000737:chemistry*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D010531:Peritoneal Dialysis, Continuous Ambulatory / Q000009:adverse effects* / Q000379:methods; D011188:Potassium / Q000032:analysis* / Q000097:blood; D011336:Probability; D012016:Reference Values; D006435:Renal Dialysis / Q000009:adverse effects* / Q000379:methods; D014511:Uremia / Q000097:blood / Q000628:therapy*
chemical_list: D011188:Potassium; D002118:Calcium