Abstract
Editor—We feel that the recent paper by Yoshitani and colleagues1 raises important issues. They demonstrated that, in patients undergoing elective hip arthroplasty, normovolaemic haemodilution caused no change in jugular bulb saturations () but decreased cerebral saturations () when measured with a cerebral oximeter (INVOS 4100S). Two explanations were offered for the unexpected disparity in readings. First, they postulated that subtle changes in regional might not be revealed with the global measure provided by . Second, they proposed that changes in near infrared path length induced by haemodilution could affect the readings.
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