TABLE 1822 Anticipated Laboratory Abnormalities in Cyanide

Some authors suggest measurement of the oxygen saturation of venous blood drawn from the femoral vein, which is about 40 mmHg in normal patients on room air.12 The oxygen saturation from an antecubital vein reported in one cyanide poisoned patient on 100% O 2 was 95 percent.16 Unfortunately, the range of normal values for peripheral venous oxygen saturation and the effects of oxygen administration on these values have not been well studied. Thus, little useful information is likely to be gained.17 An indirect but potentially useful finding related to this phenomenon is due to increased "arteriolization" of veins on funduscopic examination due to increased Po2.16

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