The following ultrasonic findings are obtained at both time points before and after induction of anesthesia (T1) and after induction (T2) in normal children . Positive pressure ventilation (Tidal volume of 6-8 ml/kg and a positive exhalation pressure of 5 cmH2O) is applied after anesthetic induction. 1. Inferior vena cava diameter and distensibility 2. Hepatic vein Doppler 3. Portal vein Doppler 4. Splenic artery and vein Doppler 5. Renal artery and vein Doppler Based on this, the reference values for Doppler findings before and after anesthesia in normal children are obtained.
Study Type
INTERVENTIONAL
Allocation
NA
Purpose
DIAGNOSTIC
Masking
NONE
Enrollment
100
1. Inferior vena cava diameter and distensibility 2. Hepatic vein Doppler 3. Portal vein Doppler 4. Splenic artery and vein Doppler 5. Renal artery and vein Doppler
Jin-Tae Kim
Seoul, South Korea
RECRUITINGportal vein flow velocity (cm/s) during self respiration
Time frame: just before anesthesia induction (about 5 minutes before anesthetic induction)
portal vein flow velocity (cm/s) during general anesthesia
Time frame: during positive pressure ventilation (within 5 - 60 minutes after anesthetic induction)
splenic vein flow velocity (cm/s) during self respiration
Time frame: just before anesthesia induction (about 5 minutes before anesthetic induction)
inferior vena cava diameter (mm) during self respiration
Time frame: just before anesthesia induction (about 5 minutes before anesthetic induction)
inferior vena cava diameter (mm) during general anesthesia
Time frame: during positive pressure ventilation (within 5 - 60 minutes after anesthetic induction)
hepatic vein flow velocity (cm/s) during self respiration
Time frame: just before anesthesia induction (about 5 minutes before anesthetic induction)
hepatic vein flow velocity (cm/s) during general anesthesia
Time frame: during positive pressure ventilation (within 5 - 60 minutes after anesthetic induction)
renal artery/vein flow velocities (cm/s) during self respiration
Time frame: just before anesthesia induction (about 5 minutes before anesthetic induction)
renal artery/vein flow velocities (cm/s) during general anesthesia
Time frame: during positive pressure ventilation (within 5 - 60 minutes after anesthetic induction)
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