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Canadian Journal of Anesthesia, Vol 33, 300-307, Copyright © 1986 by Canadian Anesthesiologists' Society

Oscillometry and Direct Blood Pressure: A Comparative Clinical Study During Deliberate Hypotension

M. GOURDEAU MD1, R. MARTIN MD FRCPC1, Y. LAMARCHE MD FRCPC1, and L. Tétreault MD MSC1

1 Departments of Anaesthesia and Medicine, C.H.U.S., Sherbrooke, Quebec

Address correspondence to: Dr. R. Martin, Department of Anaesthesia, Centre Hospitalier, Universitaire de Sherbrooke, 3001, 12th Avenue North, Fleurimont, P. Que., Canada, J1H 5N4.

Oscillometry using an automatic monitor was compared with invasive blood pressure monitoring in 21 patients scheduled for surgery under general anaesthesia with deliberate hypotension. Six ranges of mean blood pressure measurements were studied, two of which were hypotensive. An excellent correlation was found between the two methods (systolic: r = 0.94; mean: r = 0.93; diastolic: r = 0.88) but there was a large variability among individual subjects. For systolic, diastolic and mean intra-arterial readings above an approximative value of 10.64 KPa (80 mmHg), the oscillometric monitor was found to underestimate blood pressure. Inversely, it was found to overestimate blood pressure for intraarterial readings under the approximative value of 10.8 KPa (80 mmHg).

We conclude that the non-invasive monitor represents a good trend estimation of the invasive radial blood pressure technique, but that wide inter-individual variability and the overestimation of blood pressure below an approximative value of 10.64 KPa (80 mmHg) precludes interchange of techniques when absolute values are considered, especially during controlled hypotension. However, oscillometry could represent a better estimate of central aortic pressure.

Key Words: MONITORING: blood pressure • MEASUREMENT TECHNIQUE: blood pressure, invasive, non-invasive, oscillometry






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Copyright © 1986 by the Canadian Anesthesiologists' Society.