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Needle direction affects the sensory level of spinal anesthesia
R Stienstra1, F van Poorten, J W Kroon
1Department of Anesthesiology, Reinier de Graaf Gasthuis, DELFT, The Netherlands.
Anesthesia and Analgesia
|April 1, 1989
Summary
The direction of the spinal needle significantly impacts anesthesia spread. A steep, angled approach (≤50 degrees) resulted in a greater cephalad spread of spinal anesthesia compared to a perpendicular needle insertion.
Area of Science:
- Anesthesiology
- Neurosurgery
- Spinal Anesthesia
Background:
- Spinal anesthesia is a common procedure for lower body surgeries.
- The spread of local anesthetics in the subarachnoid space influences the level of anesthesia achieved.
- Needle direction during spinal injection is a potential factor affecting anesthetic spread.
Purpose of the Study:
- To investigate the effect of spinal needle direction on the cephalad spread of intrathecal anesthesia.
- To compare the sensory and temperature loss levels between different needle insertion angles.
Main Methods:
- Two groups of twenty patients received 3 ml of 0.5% bupivacaine intrathecally.
- Group 1: Paramedian approach with needle angle ≤50 degrees.
- Group 2: Median or paramedian approach with needle angle 70-100 degrees; patients remained sitting for 3 minutes post-injection.
Main Results:
- Statistically significant differences in sensory loss levels (T3.4 vs. T5.1) and temperature loss levels (T2.6 vs. T4.2) were observed between the groups at 30 minutes.
- The steep paramedian approach (≤50 degrees) resulted in an average cephalad spread approximately 1.6 segments greater.
Conclusions:
- Spinal needle direction is a critical factor in determining the extent of spinal anesthesia spread.
- A steep paramedian approach (≤50 degrees) promotes a more cephalad spread of anesthetic compared to a perpendicular approach.
- Optimizing needle angulation can potentially enhance the effectiveness and predictability of spinal anesthesia.