Assessment of Cranial Spread of Two Different Volumes of Local Anesthetics Using Ultrasound during Caudal Blockade in Children.

Summary: When performing surgery on young children below the belly button, doctors often use a "caudal block"—a type of injection near the tailbone that numbs the lower body. However, knowing exactly how much anesthetic to use to reach the right spinal level without going too high has been a subject of debate. In this study, doctors used real-time ultrasound to watch exactly where the medicine went in 50 children. They compared two different amounts of medication (volumes). They found that using a slightly higher volume (1 ml/kg) caused the numbing medicine to spread higher up the back (to the L1-L2 vertebrae), while the lower volume (0.75 ml/kg) stayed lower (L2-L3). Both amounts were safe and kept blood pressure stable. This helps anesthesiologists choose the precise dose needed based on where the surgery is located.