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Oscillometry and direct blood pressure: A comparative clinical study during deliberate hypotension

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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 intra-arterial 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 pres-sure 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.


Chez 21 patients qui subissaient une chirurgie sous hypotension contrôlée, nous avons comparé l’oscillomé-trie avec la pression artérielle sanglante. Six niveaux de pression artérielle moyenne dont deux étaient dans des valeurs hypotensives ont été étudiés. Nous avons trouvé une bonne corrélation entre les deux techniques (systole: r = 0.94; moyenne: r = 0.93; diastole: r = 0.88), avec cependant beaucoup de variations individuelles. Pour les valeurs de systole, de diastole et de moyenne au-dessus d’une valeur approximative de 10.64 KPa (80 mmHg), l’oscillométrie sousestime la pression artérielle. Au contraire, pour une pression intra-artérielle en-dessous d’une valeur approximative de 10.84 KPa (80 mmHg), l’oscillométrie surestime la pression.

Nous concluons que le moniteur non envahissant donne une bonne tendance de la pression radiale sanglante, mais que de grandes variations entre individus et une surestimation de la pression en bas d’une valeur approximative 10.64 KPa (80 mmHg) par cet appareil oscillométrique nous empechent ad’interchanger ces deux types de monitorage depression artérielle en hypotension artérielle contrôlée. Cependant, il se peut que l’oscillométrie soil un meilleur reflet de la pression aortique que la tension radiale sanglante.


  1. 1

    Bruner JMR. Handbook of Blood Pressure Monitoring. PSG Publishing Company Inc., Littleton, 1978.

  2. 2

    Yelderman M, Ream AK. Indirect measurement of mean blood pressure in the anesthetized patient. Anesthesiology 1979; 50:253–6.

  3. 3

    Silas JH, Baker AT, Ramsay LE. Clinical evaluation of Dinamap 845 automated blood pressure recorder. Br Heart J 1980; 43:202–5.

  4. 4

    Gravlee GP, Wong AB, Mills SA, Hudspeth AS, Cordell AR. Comparison of direct and indirect arterial pressure management during cardiac surgery. Anesthesiology 1984; 61:A176.

  5. 5

    Borow KM, Newburger JW. Noninvasive estimation of central aortic pressure using the oscillometric method for analyzing system artery pulsatile blood flow: comparative study of indirect systolic, diatolic and mean brachial artery pressure with simultaneous direct ascending aortic pressure measurement. Am Heart J 1982; 103:879–86.

  6. 6

    Hutton P, Dye J, Prys-Roberts C. An assessment of the Dinamap 845. Anaesthesia 1984; 39:261–7.

  7. 7

    Johnson CJH, Kerr JH. Automatic blood pressure monitors. Anaesthesia 1985; 40:471–8.

  8. 8

    Bruner JMR, Krenis LJ, Kunsman JM, Sherman AP. Comparison of direct and indirect methods of measuring arterial blood pressure. Medical Instrumentation 1981; 15:11–21, 15: 97-101.

  9. 9

    Van Bergen FH, Weatherhead DS, Trelvas AE, Kobkin AB, Buckley IJB. Comparison of indirect and direct methods of measuring arterial blood pressure. Circulation 1954; 10:481–90.

  10. 10

    Gloyna DF, Huber P, Abston P, Arens JF. A comparison of blood pressure measurement techniques in the hypotensive patient. (Abstract) Anesth Analg 1984; 63:222.

  11. 11

    Gardner RM. Direct blood pressure measurement dynamic response requirements. Anesthesiology 1981; 54:227–36.

  12. 12

    Geddes LA, Tivey R. The importance of cuff width in measurement of blood pressure indirectly. Cardiovasc Res Cen Bui 1976; 14:69–79.

  13. 13

    Rowell LB, Brengelmnn GL, Blackmon JR, Bruce RA, Murray JA. Disparities between aortic and peripheral pulse pressure induced by upright exercice and vasomotor changes in man. Circulation 1968; 37:954–64.

  14. 14

    Yamakoshi K, Shimazu H, Shibata M, Kamiya A. New oscillometric method for indirect measurement of systolic and mean arterial pressure in the human finger. Correlation study. Med Biol Eng Comput 1982; 20:307–18.

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Correspondence to M. Gourdeau or R. Martin or Y. Lamarche or L. Tetreault.

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Gourdeau, M., Martin, R., Lamarche, Y. et al. Oscillometry and direct blood pressure: A comparative clinical study during deliberate hypotension. Can Anaesth Soc J 33, 300–307 (1986).

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Key words

  • Monitoring: blood pressure
  • Measurement technique: blood pressure
  • Invasive
  • non-invasive
  • oscillometry