INTERVENTIONS |
Intervention type
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Intervention name
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Dose
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Duration
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Intervention description
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Group size
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Nature of control
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Experimental Group |
ultrasound guided erector spinae block |
20 ml plain bupivacaine 0.25% injected beneath the erector spinae muscle sheath) at the level of the eighth thoracic segment (T8) once before surgery. |
one shot injection |
The patient will be placed in a sitting position and superficial (5-12 MHz) ultrasound transducer will be placed in a longitudinal orientation, 3 cm lateral to the T8 spinous process. An 8-cm 22-gauge spinal needle will be inserted in cephalic direction until the needle tip hit the transverse process of T8 under ultrasound image visualization, then the needle will be withdrawn slowly to be within the interfacial plane below the erector spinae muscle, then the anesthetic mixture will be injected . |
35 |
|
Experimental Group |
US guided Thoracic Paravertebral Block |
20ml) (plain bupivacaine 0.25% injected in the paravertebral space) at (T8). |
single shot before surgery |
Patients of the PVB group will be placed sitting upright with the neck and back flexed and the shoulders relaxed forward. The spinous process of T8 will be palpated and marked at its inferior aspect. After sterilization of the back of the patient with Povidone iodine 10%, 3 ml Lignocaine will be injected subcutaneously 3 centimeters lateral to the spinous process of T8 making awheel, a 2-5 MHz low frequency transducer will be placed parallel to the spinous process. The transverse process (TP), the costo-transverse ligament (CTL) and the pleura (P) will be identified. Tilting of the probe may allow for better visualization of the costo-transverse ligament and pleura. Spinal 22G needle (B. Braun, Melsungen, Germany) will be inserted at the cephalic end of the transducer using in-plane technique, the needle is directed towards the CTL. The passage of the needle through the CTL is associated with a pop; indicating that the needle crossed the superior costotransverse ligament. After gentle aspiration of the syringe for exclusion of blood and air, anesthetic mixture will be injected into the paravertebral space. |
35 |
|
Control Group |
Thoracic Epidural Block |
(20ml) (plain bupivacaine 0.25% injected in the Epidural space) at (T8). |
single shot injection before starting surgery |
The T8–T9 intervertebral level will be identified by counting-up from the last rib. The puncture will be performed via paramedian approach; the probe will be placed in longitudinal direction at the level of the 12th rib in a parasagittal plane 2 cm from the midline. Then moving the probe upward and the ribs will be counted until reaching the 8 th rib. Then the probe will be directed medially to identify the dura matter at the T8–T9 intervertebral space, and a skin mark will be placed to identify the correct level of the block. The block will be performed after sterilization of the back. The puncture will be performed via paramedian approach in all patients with a 18 G needle (B. Braun, Melsungen, Germany) using loss of resistance technique. After gentle aspiration of the syringe for exclusion of blood and air, anesthetic mixture will be injected into the epidural space.
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35 |
Active-Treatment of Control Group |