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Saddle block for circumcission

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saddle block anesthesia circumcision technique pediatric local anesthetic guideline

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circumcision AND spinal anesthesia

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https://pmc.ncbi.nlm.nih.gov/articles/PMC5278069

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circumcision AND anesthesia

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A saddle block can provide anesthesia for adult circumcision because it anesthetizes the sacral dermatomes supplying the penis and perineum, chiefly S2-S4. It is a low-dose intrathecal spinal anesthetic intended to confine sensory block to the “saddle” area: perineum, genitalia, perianal region, medial buttocks, and upper inner thighs.
However, it is not usually the first choice for routine circumcision, particularly in children. A dorsal penile nerve block plus penile ring block, with appropriate sedation or general anesthesia when needed, is more targeted and avoids neuraxial risks. Caudal anesthesia is another common pediatric option.

If considering saddle block

  • Potential indication: adult circumcision or other short perineal procedures when a neuraxial technique is appropriate.
  • Positioning principle: intrathecal injection followed by sitting position to limit a hyperbaric local anesthetic to sacral roots.
  • Assessment before surgery: confirm an adequate sacral sensory level, typically including the penile/perineal distribution, before incision.
  • Monitoring: standard anesthesia monitoring, IV access, resuscitation capability, and observation for hypotension, bradycardia, urinary retention, nausea, post-dural-puncture headache, inadequate or unexpectedly high block, and rare neurologic/infectious/bleeding complications.
  • Do not use / defer with refusal, infection at puncture site, uncorrected hypovolemia, significant coagulopathy or unsafe anticoagulation status, raised intracranial pressure from a mass lesion, or relevant neurologic/anatomical concerns.
A saddle block is an intrathecal technique and should be performed only by an appropriately trained anesthesia clinician in a properly monitored setting. The textbook material describes it as analgesia of the perineum, buttocks, and inner thighs from intrathecal local anesthetic, and notes that its complications are essentially those of spinal anesthesia. For circumcision, the retrieved evidence context shows dorsal penile block and caudal block are commonly used alternatives.
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A saddle block is a low spinal (intrathecal) anesthetic that blocks the sacral roots, producing anesthesia of the perineum, buttocks, medial thighs, and external genital area.
For circumcision, it can provide surgical anesthesia, especially in cooperative adults, but it is not usually the first choice for routine pediatric or neonatal circumcision because it is more invasive than needed and can cause hypotension, urinary retention, post-dural puncture headache, and lower-limb motor block.
Preferred approaches
  • Neonate: dorsal penile nerve block or penile ring block, with or without topical EMLA.
  • Older child: general anesthesia plus dorsal penile block or caudal block for analgesia is common.
  • Adult: local penile ring/dorsal penile nerve block, with sedation if needed. A spinal/saddle block is an alternative where appropriate and performed by an anesthetist.
The penis is supplied mainly by the dorsal penile nerves, terminal branches of the pudendal nerve. For circumcision, a dorsal penile block can be supplemented with a ventral/perineal nerve injection to improve coverage of the frenular area. Miller's Anesthesia describes penile block as well suited to outpatient penile/preputial surgery and notes that supplemental ventral injection can reduce incomplete block during circumcision. Miller's Anesthesia, 10e, p. 11102.
Do not attempt an intrathecal saddle block outside an appropriately monitored operating setting. It requires sterile neuraxial technique, full monitoring, resuscitation readiness, and screening for contraindications such as infection at the puncture site, coagulopathy/anticoagulants, severe hypovolemia, or patient refusal.
A saddle block gives perineal anesthesia through spinal local anesthetic, whereas a caudal block is an epidural injection through the sacral hiatus. Pfenninger and Fowler's Procedures for Primary Care, Third, p. 1207.
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