To the Editor.
—Moseley et al, in their article entitled "Raised Plasma Urea Levels After Myocardial Infarction" in the March Archives (1981;141:438-440), discussed some important metabolic and renal function changes after myocardial infarction. However, there are several apparent errors in the Table accompanying this article. The number of patients with non-myocardial infarction should read ten rather than 60.The calculation of the urine urea-creatinine ratio is undefined in either the Table or the article. Presumably, the authors mean this ratio to be the micromoles of urea per micromole of creatinine in urine. You cannot use the ratio indicated in the Table without first dividing it by 1,000. Otherwise, the percentage of tubular resorption of the urea equation given cannot be correctly calculated.Lastly, the figure given for the percentage of tubular resorption of urea in the last column of the table does not fit the data provided in the text