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    « Dialysis & CKD Blog Report 1/10 | Main | The meaning of knowing your options »

    January 10, 2009

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    John Agar

    Bill ... thank you for your website and all the useful information you put up here. Though I try as best I can to refrain from putting my oar in too often, I just had to write this ... there are times when you just have to given in to the urge and say what you want to say!

    Here goes ...

    It continues to frustrate, bemuse and depress me as I read here and elsewhere (on the HDC patient message-boards in particular) of the pleas from patients to those who I believe SHOULD know better ... to stop the continuing arguments over the unarguable ... and to do something concrete, tangible, sensible and practical (and to do it fast) to improve the delivery of dialysis for the hundreds of thousands of underdialysed, under treated patients that form our facilty-based clientelle and for whom we have a responsibility to 'do our best'.

    Sadly, though, we do much less than our best. I feel a personal responsibility to continue to try to change this sorry state of affairs.

    I feel driven to continue to stress this simple fact ...

    * that dialysis dose as measured by urea clearance is simply not the answer

    * that the true meaning of dose is amount (time x frequency) and that the rest follows

    * that there is nothing more tricky to it, nothing more complex, than a very simple, easy to remember phrase ... 'good dialysis is more dialysis'

    When we take a medicine (eg: a drug like an antibiotic), we talk of the dose of the drug being a simple multiplication of (1) the amount (eg: mgs) of the drug being taken x (2) the frequency (how often) it is taken. 500mg twice times a day is 1/2 the dose of 1000mg twice times a day but 1/6th the dose of 2000mg three times a day. That's kind of simple, isnt it?

    Dialysis is no different. To pretend otherwise is to make the whole problem far more complicated than it needs to be.

    More dialysis = more dose, almost regardless of the blood flow rate, the dialysate flow rate, the membrane size, type or shape etc etc etc

    Now, I grant you, it IS true that some small solutes (like urea) are removed faster at the start of dialysis than at the end (as the concentration gradient diminishes and thus the speed of removal slows) ... but ...

    (1) this is not true of all solutes (eg: phosphate)

    (2) this simply smoke-screens the salient truth that 'more is good and less is bad'. Though it can be used for an argument to support short and frequent (short daily) over conventional dialysis, it also follows that long and frequent ought to be (and is) best of all.

    It makes me so sad to have to keep posing this question ... but, like the song says ...

    'When will they ever learn - when will they ever learn'.

    John Agar

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