Related Experiment Videos
Testing anal sphincter tone predicts the effectiveness of caudal analgesia in children
Susan T Verghese1, Lucille A Mostello, Ramesh I Patel
1Department of Anesthesiology, Children's National Medical Center, Washington, DC 20010, USA. sverghes@cnmc.org
Insights
A lax anal sphincter in children reliably predicts effective caudal block analgesia. This simple test helps determine if additional pain management is needed after surgery, improving pediatric postoperative care.
Area of Science:
- Anesthesiology
- Pediatric Surgery
- Pain Management
Background:
- Caudal blockade is a common analgesic technique in pediatric surgery.
- Assessing the effectiveness of caudal blocks before patient emergence is crucial for optimal pain management.
- Current methods for evaluating block efficacy can be subjective or invasive.
Purpose of the Study:
- To evaluate the effectiveness of caudal blocks in pediatric patients undergoing inguinal and/or penile surgery.
- To determine if anal sphincter laxity correlates with effective caudal block analgesia.
- To assess the diagnostic accuracy of anal sphincter tone for predicting caudal block success.
Main Methods:
- A prospective study involving 178 children undergoing inguinal and/or penile surgery.
- Administration of bupivacaine 0.25% for caudal blockade.
- Assessment of anal sphincter tone before emergence from anesthesia and correlation with intraoperative and postoperative narcotic requirements.
Main Results:
- A lax anal sphincter significantly correlated with reduced narcotic administration (P < 0.001).
- The sphincter tone test demonstrated high sensitivity (98.1%) and specificity (94.4%).
- Excellent positive predictive value (99.4%) and good negative predictive value (85%) were observed.
Conclusions:
- Lax anal sphincter tone is a reliable indicator of effective caudal block analgesia in pediatric patients.
- This non-invasive assessment can guide decisions regarding repeat blocks or alternative analgesia strategies.
- Implementing this assessment can optimize postoperative pain control in children.
Unlabelled:
In this study, we examined the effectiveness of caudal blocks and correlated it with the laxity of the patients' anal sphincter before emergence from anesthesia in 178 children undergoing inguinal and/or penile surgery. Bupivacaine 0.25% in a volume of 0.6-1.25 mL/kg was used in all patients. The presence of a lax anal sphincter at the end of surgery correlated significantly with the reduced administration of narcotics intraoperatively and in the postanesthesia care unit (P < 0.001). The sensitivity of the sphincter tone test was 98.1% with a 95% confidence interval (CI) ranging from 94.3% to 99.6%. The specificity of the test was 94.4% with a 95% CI of 72.0%-100%. The positive predictive value of this test in predicting adequate caudal block was excellent (99.4%) with a 95% CI of 96.1%-100%. The negative predictive value was better than average (85%) with a 95% CI of 62.9%-95.4%. We conclude that a lax anal sphincter can predict the effectiveness of analgesia after pediatric caudal blockade. A tight sphincter may suggest the need to repeat the block before the child awakens, or consider alternate methods of postoperative analgesia.
Implications:
A lax anal sphincter in children undergoing inguinal and/or penile surgery can predict the effectiveness of analgesia after pediatric caudal blockade.