Caudal block is commonly used for postoperative analgesia in paediatric patients. A higher volume (1.5 ml/kg) of local anaesthetic for caudal block has been reported to not only increase the level of cranial spread but also provide better quality and longer duration of analgesia in comparison with the conventional volume (1.0 ml/kg). However, caudal block with a high volume of local anaesthetic can increase intracranial pressure (ICP). Previous studies have shown that propofol anesthesia lowers ICP when compared with volatile anesthesia. Therefore, this study was designed to test if propofol can reduce the magnitude of ICP increase following caudal block when compared with a volatile anesthetic, sevoflurane. There is increasing evidence that optic nerve sheath diameter (ONSD) measured by ultrasonography correlates with degree of ICP and is able to detect intracranial hypertension. Therefore, ONSD will be measured as a surrogate of ICP.
Equal number of patients are randomly assigned to the P or S group. The participants in the P and S group are anesthetized with propofol and sevoflurane, respectively. Irrespective of assigned group, all participants receive caudal block with 1.5 ml/kg of 0.15% ropivacaine (up to 30 ml per individual participant). All anesthetic procedures except for main anesthetic agent are the same in all participants. ONSD is measured at the following time points: before (T0), immediately after (T1), and 10 min (T2) and 30 min(T3) after caudal block. Two measurements of each optic nerve sheath are acquired in each eye. The mean value of the four measurements is considered as the ONSD at each time point.
Study Type
INTERVENTIONAL
Allocation
RANDOMIZED
Purpose
OTHER
Masking
SINGLE
Enrollment
60
The participants in the group P are anesthetized with propofol
The participants in the group S are anesthetized with sevoflurane.
Department of Anesthesiology and Pain Medicine, Yonsei University College of Medicine
Seoul, South Korea
ONSD
ONSD is a surrogate for ICP. ONSD was measured by transorbital sonography. Transorbital sonography is performed using a linear 6-13 Hz probe. After applying a thick layer of sterile coupling gel on the closed upper eyelid, the probe is placed gently without exerting pressure. Axial images of the orbit are acquired in the plane of the optic nerve, and ONSD is measured 3mm posterior to the optic nerve head as described previously.
Time frame: before (T0) caudal block.
ONSD
ONSD is a surrogate for ICP. ONSD was measured by transorbital sonography. Transorbital sonography is performed using a linear 6-13 Hz probe. After applying a thick layer of sterile coupling gel on the closed upper eyelid, the probe is placed gently without exerting pressure. Axial images of the orbit are acquired in the plane of the optic nerve, and ONSD is measured 3mm posterior to the optic nerve head as described previously.
Time frame: immediately after (T1) caudal block.
ONSD
ONSD is a surrogate for ICP. ONSD was measured by transorbital sonography. Transorbital sonography is performed using a linear 6-13 Hz probe. After applying a thick layer of sterile coupling gel on the closed upper eyelid, the probe is placed gently without exerting pressure. Axial images of the orbit are acquired in the plane of the optic nerve, and ONSD is measured 3mm posterior to the optic nerve head as described previously.
Time frame: 10 minutes (T2) after caudal block.
ONSD
ONSD is a surrogate for ICP. ONSD was measured by transorbital sonography. Transorbital sonography is performed using a linear 6-13 Hz probe. After applying a thick layer of sterile coupling gel on the closed upper eyelid, the probe is placed gently without exerting pressure. Axial images of the orbit are acquired in the plane of the optic nerve, and ONSD is measured 3mm posterior to the optic nerve head as described previously.
Time frame: 30 minutes (T3) after caudal block.
The variables affecting ICP : Heart rate (beats per minute)
Time frame: before (T0) caudal block.
The variables affecting ICP : Heart rate (beats per minute)
Time frame: immediately after (T1) caudal block.
The variables affecting ICP : Heart rate (beats per minute)
Time frame: 10 minutes (T2) after caudal block.
The variables affecting ICP : Heart rate (beats per minute)
Time frame: 30 minutes (T3) after caudal block.
The variables affecting ICP : Mean arterial pressure (mmHg)
Time frame: before (T0) caudal block.
The variables affecting ICP : Mean arterial pressure (mmHg)
Time frame: immediately after (T1) caudal block.
The variables affecting ICP : Mean arterial pressure (mmHg)
Time frame: 10 minutes (T2) after caudal block.
The variables affecting ICP : Mean arterial pressure (mmHg)
Time frame: 30 minutes (T3) after caudal block.
The variables affecting ICP : End-tidal carbon dioxide partial pressure (mmHg)
Time frame: before (T0) caudal block.
The variables affecting ICP : End-tidal carbon dioxide partial pressure (mmHg)
Time frame: immediately after (T1) caudal block.
The variables affecting ICP : End-tidal carbon dioxide partial pressure (mmHg)
Time frame: 10 minutes (T2) after caudal block.
The variables affecting ICP : End-tidal carbon dioxide partial pressure (mmHg)
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Time frame: 30 minutes (T3) after caudal block.
The variables affecting ICP : End-tidal sevoflurane concentration (volume %)
Time frame: before (T0) caudal block.
The variables affecting ICP : End-tidal sevoflurane concentration (volume %)
Time frame: immediately after (T1) caudal block.
The variables affecting ICP : End-tidal sevoflurane concentration (volume %)
Time frame: 10 minutes (T2) after caudal block.
The variables affecting ICP : End-tidal sevoflurane concentration (volume %)
Time frame: 30 minutes (T3) after caudal block.
The variables affecting ICP : Estimated propofol effect-site concentration (μg/ml)
Time frame: before (T0) caudal block.
The variables affecting ICP : Estimated propofol effect-site concentration (μg/ml)
Time frame: immediately after (T1) caudal block.
The variables affecting ICP : Estimated propofol effect-site concentration (μg/ml)
Time frame: 10 minutes (T2) after caudal block.
The variables affecting ICP : Estimated propofol effect-site concentration (μg/ml)
Time frame: 30 minutes (T3) after caudal block.
The variables affecting ICP : Body temperature (℃)
Time frame: before (T0) caudal block.
The variables affecting ICP : Body temperature (℃)
Time frame: immediately after (T1) caudal block.
The variables affecting ICP : Body temperature (℃)
Time frame: 10 minutes (T2) after caudal block.
The variables affecting ICP : Body temperature (℃)
Time frame: 30 minutes (T3) after caudal block.
The variables affecting ICP : Peak inspiratory pressure (mmHg)
Time frame: before (T0) caudal block.
The variables affecting ICP : Peak inspiratory pressure (mmHg)
Time frame: immediately after (T1) caudal block.
The variables affecting ICP : Peak inspiratory pressure (mmHg)
Time frame: 10 minutes (T2) after caudal block.
The variables affecting ICP : Peak inspiratory pressure (mmHg)
Time frame: 30 minutes (T3) after caudal block.