Abstract
This study aims to evaluate possible differences in the values obtained by automated detection of hypertension, bradycardia and arterial blood oxygen desaturation between one minute and five minute automated recordings of physiologic data. The mean arterial pressure (MAP), heart rate (HR) derived from the radial pulse, and the arterial O2 saturation read by pulse oximeter (SpO2) were sampled continually in 20 patients undergoing general anesthesia. Anesthesia was induced and maintained using the same technique in all patients. Each parameter was automatically downloaded at one and five minute intervals to separate electronic spreadsheets. Hypertension was defined as MAP greater than 120 mmHg; bradycardia as HR lower than 50 bpm, and hypoxia as SpO2 < 95%. From the data presented we conclude that the five minute recording rate does not recognize the same number of clinical events as one minute recordings. This source of error must be considered when designing systems for computerized record keeping of anesthesia charts and when interpreting the data stored in electronic databases.
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