Two-handed mask ventilation has been shown to provide higher tidal volume than one-handed mask ventilation. The effects of the two techniques on respiratory mechanics during induction of general anesthesia, however, still need to be determined.
Mask positive pressure ventilation always causes the changes of respiratory mechanics such as ventral redistribution of regional ventilation, which impairs gas exchange. Two-handed mask ventilation has been shown to improve gas exchange by providing higher tidal volume than one-handed mask ventilation. We hypothesis that those higher tidal volume caused by two-handed mask ventilation would also improve the respiratory mechanics during induction of general anesthesia.
Study Type
INTERVENTIONAL
Allocation
RANDOMIZED
Purpose
TREATMENT
Masking
SINGLE
Enrollment
80
Using one-handed mask ventilation techniques during induction of general anesthesia
Using two-handed mask ventilation techniques during induction of general anesthesia
global inhomogeneity (GI)
EIT images will be acquired by using the EIT monitor (Drager Medical Gmbh, Lubeck, Germany). And a software package (Electrical impedance tomography diag custom software provided by Drager Medical) will be used to quantitatively analyze the EIT data. 0% = homogenous
Time frame: 8 weeks
centre of ventilation (CoV)
EIT images will be acquired by using the EIT monitor (Drager Medical Gmbh, Lubeck, Germany). And a software package (Electrical impedance tomography diag custom software provided by Drager Medical) will be used to quantitatively analyze the EIT data. 100% = entirely dorsal.
Time frame: 8 weeks
regional ventilation delay (RVD)
EIT images will be acquired by using the EIT monitor (Drager Medical Gmbh, Lubeck, Germany). And a software package (Electrical impedance tomography diag custom software provided by Drager Medical) will be used to quantitatively analyze the EIT data.
Time frame: 8 weeks
ventilation of regional lung ( %)
EIT images will be acquired by using the EIT monitor (Drager Medical Gmbh, Lubeck, Germany). And a software package (Electrical impedance tomography diag custom software provided by Drager Medical) will be used to quantitatively analyze the EIT data.
Time frame: 8 weeks
Expiratory tidal volume (TV)
Expiratory tidal volume will be recorded through the anesthesia machine.
Time frame: 8 weeks
PaO2/FiO2
PaO2/FiO2 will be recorded through arterial blood gas analysis.
Time frame: 8 weeks
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