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Haemodynamic changes with the laryngeal mask airway – off the cuff

Published online by Cambridge University Press:  16 August 2006

S. Colbert ,
D. M. O'Hanlon ,
R. Page ,
F. Flanagan  and
D. Moriarty
S. Colbert
Affiliation:
Department of Anaesthesia, The Mater Misericordiae Hospital, Eccles Street, Dublin 7, Ireland
D. M. O'Hanlon
Affiliation:
Department of Surgery, The Mater Misericordiae Hospital, Eccles Street, Dublin 7, Ireland
R. Page
Affiliation:
Department of Anaesthesia, The Mater Misericordiae Hospital, Eccles Street, Dublin 7, Ireland
F. Flanagan
Affiliation:
Department of Radiology, The Mater Misericordiae Hospital, Eccles Street, Dublin 7, Ireland
D. Moriarty
Affiliation:
Department of Anaesthesia, The Mater Misericordiae Hospital, Eccles Street, Dublin 7, Ireland
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Abstract

The cross-sectional area of the common carotid artery bulb was measured using a 5 MHz pulse wave Doppler probe in a patient undergoing general anaesthesia using a laryngeal mask airway (LMA). A simultaneous measurement of blood velocity was performed to allow determination of the blood flow. Following inflation of the cuff on the LMA, the cross-sectional area of the right carotid artery bulb decreased from 1.09 to 0.89 cm2, flow velocity increased 120 to 176 cm s−1 and the blood flow increased from 130.8 to 156.6 cm3 s−1. On the left the cross-sectional area decreased from 1.16 to 1.13 cm2, the velocity increased 136 to 151 cm s−1 and the blood flow increased from 157·8 to 170·6 cm3 s−1 . While a reduction in cross-sectional area was observed in the carotid bulb in this patient, this was accompanied by an increase in the velocity and a consequent increase in blood flow. In patients with atheromatous disease involving the carotid arteries this decrease in cross-sectional area may prove clinically significant. The use of the LMA may not be suitable for this population.

Keywords

larynxpharynxlaryngeal mask airwaycommon carotid arterycross-sectional areablood flow
Type
Case Report
Information
European Journal of Anaesthesiology , Volume 14 , Issue 5 , September 1997 , pp. 514 - 517
Copyright
1997 European Society of Anaesthesiology

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