How Much Salt Do CKD Patients Take Per Day? A Cross Sectional Study

Objective:to survey the quantity of sodium taken in by CKD patients per day and to analyse the relationships between sodium intake and GFR,Blood Pressure,Urine Protein,gender,body weight,and the number of antihypertensive drugs.Methods:We surveyed 199 CKD patients who attended kidney clinic in Zhongshan Hospital during September,2007 and February,2008.We measured BP on sitting position,record Body weight,Height,anti-hypertension drugs and test BUN,SCr,Urine sodium excretion(If patients was taking sodium bicarbonate,we measure Urine Chloride excretion),Urine protein o We use Microsoft Access to record data and use SPSS to analyse it.Results:urine sodium excretion of these patients was 154.3±77.1(65-300.7) mmol/24h.urine sodium excretion(mmol/24h) of 48 patients(24%of total patients) was between 80 and120;123 patients(61%of total patients) was over120;28 patients(14%of total patients) was less than 80mmol/24h.Urine sodium excretion of male patient(n=88) was 166.7±77.5mmol/24h;Urine sodium excretion of female patient(n=111)was 143.6±75.4mmol/24h。There is significant difference between the two groups(p=0.028＜0.05).There is significant correlation between urine sodium excretion and body weight,and no correlation between urine sodium excretion and urine protein,BP.Conclusions:most CKD patients don't reach the goal of less than 120mmol/24h in urine natriuium excretion.Male CKD patients take more NaCl than female patients.It is necessary to do the RCT to observe the impact of sodium restricted diet on BP,urine protein,kidney disease progression and if it is rationale to establish the sodium intake critieria according to gender and body weight.