Assessment of pulse transit time to indicate cardiovascular changes during obstetric spinal anaesthesia† G Sharwood-Smith, J Bruce, G Drummond British.

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Presentation transcript:

Assessment of pulse transit time to indicate cardiovascular changes during obstetric spinal anaesthesia† G Sharwood-Smith, J Bruce, G Drummond British Journal of Anaesthesia Volume 96, Issue 1, Pages 100-105 (January 2006) DOI: 10.1093/bja/aei266 Copyright © 2006 British Journal of Anaesthesia Terms and Conditions

Fig 1 An example of patient responses. Upper, continuous trace: pulse transit time (ms). Lower, discontinuous trace: heart rate calculated from successive R-R intervals. Systolic and diastolic arterial pressures are shown as vertical bars and arrowheads. British Journal of Anaesthesia 2006 96, 100-105DOI: (10.1093/bja/aei266) Copyright © 2006 British Journal of Anaesthesia Terms and Conditions

Fig 2 Relationship of pulse transit time to mean arterial pressure in (a) normotensive subjects and (b) patients with pregnancy-induced hypertension. The open symbols are before and the closed symbols after spinal anaesthesia. The linear regression relationships are shown with the 95% confidence interval for the line. Both relationships are significant (P<0.0001). British Journal of Anaesthesia 2006 96, 100-105DOI: (10.1093/bja/aei266) Copyright © 2006 British Journal of Anaesthesia Terms and Conditions

Fig 3 Comparison of the linear regression relationships of pulse transit time and mean arterial pressure in normotensive subjects and patients with pregnancy-induced hypertension. The outer lines represent the 95% confidence interval for the regression. British Journal of Anaesthesia 2006 96, 100-105DOI: (10.1093/bja/aei266) Copyright © 2006 British Journal of Anaesthesia Terms and Conditions

Fig 4 Receiver operating characteristic curves for changes in pulse transit time in relation to a decrease in mean arterial pressure by 5 and 10%. For the 5% decrease, the area under the curve is 0.79 (0.68–0.90) and for the 10% decrease the area is 0.73 (0.60–0.85) (95% confidence intervals) Both areas are significantly greater than 0.5 (P<0.001). British Journal of Anaesthesia 2006 96, 100-105DOI: (10.1093/bja/aei266) Copyright © 2006 British Journal of Anaesthesia Terms and Conditions