Razavizadeh et al developed equations for estimating the depth of spinal needle insertion. The authors are from Kashan University of Medical Sciences in Iran.
Patient selection: 18 to 65 years of age
(1) weight in kilograms
(2) height in centimeters
(3) body mass index (BMI) in kg per square meter
needle depth in cm =
= (10.1 * (weight) / (height)) + 0.69
= (0.18 * (BMI)) + 0.56
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Specialty: Anesthesiology, Obstetrics & Gynecology, Surgery, orthopedic