Spinal anaesthesia in infants and children

Spinal blocks

Every anesthetist should have the expertise to perform lumbar puncture that is the prerequisite to induce spinal anesthesia. Spinal anesthesia is easy and effective technique: small amount of local anesthetic injected in the lumbar cerebrospinal fluid provides highly effective anesthesia, analgesia, and sympathetic and motor block in the lower part of the body. The main limitation of spinal anesthesia is a variable and relatively short duration of the block with a single-injection of local anesthetic. With appropriate use of adjuvant or combining spinal anesthesia with epidural anesthesia, the analgesic action can be controlled in case of early recovery of initial block or in patients with prolonged procedures. Contraindications are rare. Bleeding disorders and any major dysfunction in coagulation system are rare in children, but spinal anesthesia should not be used in children with local infection or increased intracranial pressure. Children with spinal anesthesia may develop the same adverse effects as has been reported in adults, but in contrast to adults, cardiovascular deterioration is uncommon in children even with high blocks. Most children having surgery with spinal anesthesia need sedation, and in these cases, close monitoring of sufficient respiratory function and protective airway reflexes is necessary. Postdural puncture headache and transient neurological symptoms have been reported also in pediatric patients, and thus, guardians should be provided instructions for follow-up and contact information if symptoms appear or persist after discharge. Epidural blood patch is effective treatment for prolonged, severe headache, and nonopioid analgesic is often sufficient for transient neurological symptoms.

Spinal anesthesia in neonates and infants - a single-center experience of 505 cases

BACKGROUND

Our aim was to assess the safety and efficacy of spinal anesthesia (SA) in newborns and infants undergoing surgery appropriate for this technique.

METHODS

The files of 505 patients who underwent surgery under spinal anesthesia since 1998 at a major tertiary hospital in Israel were analyzed retrospectively. SA was performed with bupivacaine 5 mgxml(-1) by attending pediatric anesthesiologists or an anesthesia resident. Demographic data, prematurity history, comorbidities, technical data, cardiovascular stability, complications and supplementary drugs were documented. The surgeon assessed the quality of anesthesia at the end of surgery.

RESULTS

Appropriate SA was achieved in 95.3% of cases; in 69.9% at the first attempt. The mean number of attempts per patient was 1.41 and mean dose of bupivacaine was 0.66 +/- 0.16 mgxkg(-1). Intravenous sedation, usually with midazolam (dose 0.1-0.2 mgxkg(-1)) was required in 28.1% of children because of crying/restlessness. Intraoperative conversion to general anesthesia was necessary in five patients (1.04%). The main side effect was bradycardia (<100 bxmin(-1)) without desaturation which occurred in nine patients (1.8%). In three patients (0.62%), high spinal block occurred without bradycardia and hypotension. None of the patients had postoperative meningitis.

CONCLUSIONS

SA is safe and effective in newborns and infants undergoing low abdominal, perineal and orthopedic surgery. In order to save time, our advice is to attempt SA after the surgeon is scrubbed, and minimize surgical teaching activity. The need to deal with a small and sometimes sick patient independent of the type of anesthesia requires the presence of an experienced pediatric anesthesiologist.

Spinal anaesthesia in paediatric patients

PURPOSE OF REVIEW

Spinal anaesthesia has seldom been employed in paediatric patients. Its use has been suggested mainly in former preterm newborns and infants who are known to be exposed to high perioperative apnoea risk. There is currently some evidence that spinal anaesthesia could be considered as an equal alternative to general anaesthesia as it is in adults.

RECENT FINDINGS

New drugs and adjuvants recently introduced in clinical practice, more-detailed knowledge of spread anaesthetic modalities and larger databases, now available, could today make paediatric spinal anaesthesia a more suitable technique for many anaesthetists.

SUMMARY

We will review recent literature focusing the latest techniques, drugs, dosages, and complications in order to define the limits and advantages of employing spinal anaesthesia in all paediatric ages, in routine and emergency surgery.

Isobaric Ropivacaine 5 mg/mL for Spinal Anesthesia in Children

In this clinical trial, we evaluated the clinical effects of ropivacaine for spinal anesthesia in children. An open, prospective study was performed on 93 children, aged 1-17 yr, undergoing elective lower abdominal or lower limb surgery. A plain solution of ropivacaine 5 mg/mL at a dose of 0.5 mg/kg body weight (up to 20 mg) was administered via the L3-4 or L4-5 interspace with the patient in the lateral decubitus position. After injection, the patients were placed supine. The spread and duration of sensory analgesia and the degree of motor block were recorded. Satisfactory surgical anesthesia was achieved in 92 of the 93 children. Three children received general anesthesia; in one child spinal anesthesia failed, and in two cases surgery outlasted the duration of the sensory block. Four children received supplemental analgesia for skin incision. The mean highest level of sensory block was T6 (range, T2 to T12), and the mean time to the regression of sensory block to T10 was 96 min (range, 34-210 min). One child developed transient bradycardia and one hypotension. After discharge four children developed mild transient radiating neurologic symptoms and one epidural blood patch was performed for persistent position-dependent headache. We conclude that the block performance of intrathecal isobaric ropivacaine in children (>1 yr) is similar to that obtained in adults but the safety of the larger dose used in children warrants further studies.

Epidural blood patch for management of postdural puncture headache in adolescents

BACKGROUND

In some patients spinal puncture (SP) is followed by postdural puncture headache (PDPH). When the symptoms of PDPH are severe and are not relieved within a few days an epidural blood patch (EBP) might be performed. The aim of this survey was to review requests for EBPs and to evaluate the effectiveness of EBP in patients aged 13-18 years during a 6.5 year period ending in June 2001.

METHODS

The Information System Patient Measures Database was interrogated to identify patients who were referred for EBP. After identification, the patients' medical records were reviewed in detail for the characteristics of PDPH and other symptoms, and for the effectiveness of the EBP.

RESULTS

Forty-two EBPs were performed after 40 SPs on 37 patients (24 girls, 13 boys). Epidural blood patches were performed twice in five patients. The reasons for repeating the procedure were repeat SP with new PDPH in three patients and an unsatisfactory effect in two patients. Twenty-eight of the 40 spinal punctures (70%) had been performed for diagnostic use and 10 (25%) for spinal anesthesia. Two patients (5%) developed PDPH after inadvertent dural puncture with an epidural needle. In 37 cases the criteria for PDPH were fulfilled, and one patient had a cerebrospinal fluid fistula headache. Two-thirds of the girls had associated symptoms of headache compared with one-third of the boys. Epidural blood patch was performed 1-22 days after SP with 0.2 ml/kg (mean) of autologous blood injected into the epidural space. The success rate of the first injection was 37 out of 40 EBP (93%), and the second injection was effective in both patients with recurred PDPH.

CONCLUSION

Epidural blood patch seems to be an effective and safe procedure in adolescents for treating severe and persistent PDPH.

Management of postdural puncture headache with epidural blood patch in children

BACKGROUND

Until the last decade, it was believed that postdural puncture headache (PDPH) was an uncommon complaint in children, but recent studies indicate that young children may develop PDPH after spinal puncture. When the symptoms are severe and are not relieved within a few days with analgesics, forced hydration and bed rest, then epidural blood patch (EBP) might be performed.

METHODS

In this retrospective survey, we analysed EBP performed in Kuopio University Hospital between the years 1995 and 2000.

RESULTS

During the 6-year period, seven EBP were performed in children aged 12 years or younger. Four out of the seven children had undergone a diagnostic spinal puncture, two had spinal anaesthesia and one child had spinal puncture for treatment of postoperative hygroma. Five children had a typical PDPH, one child had a cerebrospinal fluid fistula headache and one child had a headache similar to his migraine. EBP was performed 2-19 days after spinal puncture with 0.3 ml.kg-1 (mean) of autologous blood injected into the epidural space.

CONCLUSIONS

EBP gave some relief of symptoms in all children. No complications related to EBP were noticed.