British Journal of Anaesthesia, 2003, Vol. 91, No. 5 662-666
© 2003 The Board of Management and Trustees of the British Journal of Anaesthesia
Clinical Investigations |
Nociceptive and anaesthetic-induced changes in pulse transit time during general anaesthesia
1 Department of Anaesthesia and Intensive Care, Waikato Hospital, Private Bag 3200, Hamilton, New Zealand. 2 Department of Anaesthesiology, University of Auckland, Waikato Clinical School, Private Bag 3200, Hamilton, New Zealand
Corresponding author. E-mail: vossl@waikatodhb.govt.nz 
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Background. Pulse transit time (rPTT), the interval between ventricular electrical activity and arrival of a peripheral pulse waveform, has been used to detect changes in autonomic tone. The aim of this observational pilot study was to measure changes in rPTT in response to general anaesthesia and noxious stimuli.
Methods. Thirty-one healthy women undergoing gynaecological surgery were allocated to groups depending on the need for airway management with tracheal intubation (n=9), a laryngeal mask (LMA, n=17) or a facemask (n=5). During general anaesthesia, we measured changes in RR interval (RR-int) and rPTT after (i) induction of anaesthesia, (ii) airway manipulation and (iii) surgical stimulus. rPTT was estimated as the interval from the peak in the R-wave to detection of the pulse oximeter waveform in the periphery.
Results. Mean baseline rPTT was 245 (SD 27) ms. Upon induction of anaesthesia, rPTT increased (by 28.2 (20.4) ms, P<0.001) in all but two patients. rPTT decreased in response to endotracheal intubation (by 43.1 (24.6) ms, P=0.001) but did not vary in response to insertion of LMA or surgical stimulus. Mean baseline RR-int was 865 (141) ms. A mean reduction in RR-int after tracheal intubation did not reach statistical significance. RR-int was unchanged with induction of anaesthesia, LMA insertion or surgical stimulus.
Conclusion. Variation in rPTT reflects autonomic responses to nociceptive stimulation and fluctuations in anaesthetic depth independently of heart rate.
Br J Anaesth 2003; 91: 662–6
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