WEBVTT
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Language: en
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So let's look at a couple of examples for Cockroft-Gault Calculation.
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This is a male patient, age 40,
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gross body weight 70 kg
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and the serum creatinine 1 milligram percent.
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If height is not available, then use gross weight.
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And we would obtain a creatinine clearance value
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of ninety seven point two milliliters per minute.
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For the same subject, if the height is available
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one hundred seventy centimeters.
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And we can calculate ideal body weight which is equal to sixty six point two kilogram.
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And on that basis, creatinine clearance is ninety one point nine milliliters per minute.
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For the same subject again, if we normalize the creatinine clearance value to 1.73 meters square.
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Of course we have to calculate body surface area first
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by the DuBois equation.
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And creatinine clearance becomes eighty
seven point eight milliliters per minute.
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And those three values are fairly consistent with each other.
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Because this male subject is very close to Mr. standard.
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Another example of Cockroft-Gault calculation.
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This is the female patient, age 40,
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body weight 60 kg
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and the serum creatinine one milligram percent.
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If height is not available, use gross weight.
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Then creatinine clearance would be 70.8 milliliters per minute.
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However, for this same subject,
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if height is available at 155 cm,
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we first calculate the ideal body weight.
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Which turn out to be forty eight point two kg
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and the creatinine clearance is 56.8 milliliters per minute.
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Again for the same subject,
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we normalize the creatinine clearance to 1.73 meters square.
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We compute body surface area first by DuBois equation.
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And the creatinine clearance turn out to be 62.9 milliliters per minute per 1.73 meters square.
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Now this revalues is somewhat different.
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The reason is this female subject is
kind of heavy for her weight
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and weight does affect Cockroft estimation of creatinine clearance.