Control Group |
Ultrasound guided Thoracic paravertebral block |
bupivacaine 0.4mL/kg on each side |
After induction |
After the induction of anesthesia, the patient will be placed in a prone position with a pillow under the chest to perform the paravertebral block or the midpoint transverse process to pleural block on both sides. The spinous process of the fourth thoracic vertebra will be identified and marked. The ultrasound-guided TPVB and MTPB will be done under complete sterilization by using Sterillium®, sterile drapes, and putting the ultrasound probe in a sterile sheath. Ultrasound high frequency linear transducer of a GE Vivid S5 ultrasonography (General Electric Ving Med Systems, Horten, Norway) will be placed in a parasagittal position just lateral to the spinous processes of thoracic vertebra target of the paravertebral cavity. The procedure will be conducted on both sides of the spine. The internal intercostal membrane, which is continuous with the superior costotransverse ligament, will be generally observed as a thin radio-opaque line extending from the transverse process, creating a wedge-shaped pocket representing the thoracic paravertebral space. A 50 mm 22-gauge sonographic needle (stimuplex®; B. Braun Medical, Bethlehem, Pa) will inserted in an in-plane technique from a cephalad to a caudal direction and will be advanced.In TPVB group: Correct positioning of the needle will be confirmed by anterior displacement of the pleura upon the injection of the small bolus of saline or a local anesthetic. Once confirmed, when the needle pierced the internal intercostal membrane, and after careful aspiration to demonstrate the absence of air or blood, we will inject 0.25% bupivacaine 0.4mL/kg on each side. |
30 |
Active-Treatment of Control Group |
Experimental Group |
Ultrasound guided Midpoint transverse process to pleura block |
bupivacaine 0.4mL/kg on each side |
bupivacaine 0.4mL/kg on each side |
After the induction of anesthesia, the patient will be placed in a prone position with a pillow under the chest to perform the paravertebral block or the midpoint transverse process to pleural block on both sides. The spinous process of the fourth thoracic vertebra will be identified and marked. The ultrasound-guided TPVB and MTPB will be done under complete sterilization by using Sterillium®, sterile drapes, and putting the ultrasound probe in a sterile sheath. Ultrasound high frequency linear transducer of a GE Vivid S5 ultrasonography (General Electric Ving Med Systems, Horten, Norway) will be placed in a parasagittal position just lateral to the spinous processes of thoracic vertebra target of the paravertebral cavity. The procedure will be conducted on both sides of the spine. The internal intercostal membrane, which is continuous with the superior costotransverse ligament, will be generally observed as a thin radio-opaque line extending from the transverse process, creating a wedge-shaped pocket representing the thoracic paravertebral space. A 50 mm 22-gauge sonographic needle (stimuplex®; B. Braun Medical, Bethlehem, Pa) will inserted in an in-plane technique from a cephalad to a caudal direction and will be advanced.In the MTPB group: When the needle tip reaches the midpoint between the transverse process and the pleura, 1 ml normal saline is injected. Once the needle tip has been confirmed and after careful aspiration to demonstrate the absence of air or blood, we will inject 0.25% bupivacaine 0.4mL/kg on each side |
30 |
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