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British Journal of Anaesthesia, 2001, Vol. 87, No. 2 237-239
© 2001 The Board of Management and Trustees of the British Journal of Anaesthesia

Clinical Investigations

Do physiological changes in pregnancy change defibrillation energy requirements?

J. Nanson, D. Elcock, M. Williams and C. D. Deakin

Shackleton Department of Anaesthesia, Southampton University Hospitals NHS Trust, Southampton General Hospital, Tremona Road, Southampton SO16 6YD, UK*Corresponding author

Resuscitation during pregnancy is uncommon, with approximately 70 deaths occurring during pregancy in the UK per annum. Physiological changes during pregnancy may affect transthoracic impedance (TTI), which determines transmyocardial current. Increased blood volume, cardiomegaly, haemodilution, changes in lung volume and changes in thoracic volume may alter impedance in ways that are difficult to predict. We measured TTI at term and after delivery once physiological changes had resolved. Mean (SD) TTI was 91.3 (15.8) {Omega} at term and 91.6 (11.8) {Omega} 6–8 weeks after delivery; the difference was not statistically significant. We conclude that current energy requirements for adult defibrillation are appropriate for use during pregnancy.

Br J Anaesth 2001; 87: 237–9


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