The changes in Blood Pressure in Patients Undergoing Spinal Anesthesia According to the Size of Spinal Needle (G22 versus G24): Case Reference Study
Keywords:blood pressure, spinal anesthesia according, spinal needle (G22 versus G24)
Background: Previous studies of patients with spinal anesthesia prior to sympathectomy revealed that
vasodilatation and hypotension, with subsequent reduction in arterial pressure, were the most common side
effects (observed in more than 30% of patients). Hypotension in epidural anesthesia was stated to be more
gradual and less extreme than in spinal anesthesia when a comparable amount of anesthesia was given.
Aim of the study: In the current study, we are aiming to evaluate the effect of different size of spinal needle
on development of possible blood pressure changes throughout the spinal anesthesia procedure.
Patients and Methods: The current observational case reference study was carried out at Al-Diwaniyah
Teaching Hospital in Al-Diwaniyah Province, Iraq. The beginning of the study is dated back to the 3rd of
April 2018 and the study continued till September the 15th 2019. It included 60 patients undergoing spinal
anesthesia for various surgical operations. In 30 patients a spinal needle of 22 gauge was used whereas in
the second group (n = 30), a spinal needle of gauge 24 was used. All patients were instructed to be nil by
Results: In group 1 (22G), mean systolic blood pressure showed gradual reduction, 139.00 ±8.35 mmHG,
120.67 ±11.43 mmHg, 106.00 ±11.02 mmHG and 97.33 ±10.15 mmHg; similarly, in group 2 (24G) mean
systolic blood pressure showed gradual reduction, 144.00 ±10.37 mmHG, 138.00 ± 7.61 mmHg, 131.33
±9.00 mmHG and 131.67 ±11.40 mmHg; however, the rate of reduction in group 2 (G24) was less than that
seen in case of group 1 (G22). In group 1 (22G), mean diastolic blood pressure showed gradual reduction,
84.00 ±7.24 mmHG, 72.00 ±6.64 mmHg, 61.33 ±9.73 mmHG and 54.00 ±8.94 mmHg; similarly, in group
2 (24G) mean diastolic blood pressure showed gradual reduction, 87.33 ±7.85 mmHG, 81.33 ±7.30 mmHg,
77.33 ±10.15 mmHG and 78.00 ±5.51 mmHg; however, the rate of reduction in group 2 (G24) was less than
that seen in case of group 1 (G22).
Conclusion: It appears that the use of narrower spinal needle is recommended as it is associated with
significantly less drop in both systolic and diastolic blood pressure, thus less hemodynamic disturbances in
patients undergoing spinal anesthesia for various indications
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