Jackson Rees Department of Anaesthesia, The Royal Liverpool Children's Hospital NHS Trust, Alder Hey, Eaton Road, Liverpool L12 2AP, UK
* Corresponding authors. E-mail: steve.roberts{at}rlc.nhs.uk, umavelu18{at}aol.com
Accepted for publication March 24, 2005.
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Abstract |
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Keywords: anaesthesia ; anaesthetic techniques, epidural ; complications, congenital cystic adenoid malformation ; measurement techniques, ultrasound ; ventilation, one lung
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Introduction |
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The child was ventilated in PICU with a morphine infusion for sedation/analgesia and required a blood transfusion overnight, but was otherwise stable. Complications included air leaks and pneumothorax drained by a chest drain. The trachea was extubated on the 10th postoperative day and the patient discharged to the high dependency unit (HDU). The trachea had to be reintubated 4 h later and he was transferred back to PICU. On the 12th postoperative day the trachea was extubated and the child transferred to HDU on nasal CPAP. This was maintained until 24 days of age, when increasing requirement for respiratory support indicated the need for further surgery.
For the second thoracotomy standard monitoring was instituted and anaesthesia was induced with sevoflurane 8% in oxygen 100%. Peripheral i.v. access was secured and 1 mg kg1 rocuronium administered. At laryngoscopy, a size 3 Fr Fogarty catheter (guide wire in place) modified by bending the tip by 10°, was positioned in the trachea. The trachea was intubated with a 3.0 Vygon tracheal tube (with distal tip capnography). With fibreoptic guidance the tip of the Fogarty catheter was passed into the right main bronchus. The balloon of the Fogarty catheter was inflated under direct vision. The Fogarty catheter was then secured to the tracheal tube. The left radial artery was cannulated.
The child was placed in left lateral position for caudal catheter insertion. We used a Sonosite 180 Plus ultrasound machine with L38 10 MHz probe (in sterile sheath) to image the sacral hiatus, sacrococcygeal membrane, dura mater, and conus medularis. The estimated distance from the sacral hiatus to T5/6 level was 15 cm. Under aseptic conditions the sacral hiatus was palpated and an 18 G short Jelco (Medex Medical Ltd) i.v. cannula was inserted into the epidural space. The position of the cannula within the space was confirmed using ultrasound (Fig. 2) to record the anterior displacement of the duramater following injection of 2 ml of saline test bolus. We used the catheter from a standard 18 G Portex epidural kit preflushed with saline. The epidural catheter was threaded up to 20 cm. Using an ultrasound probe placed in the midline at the level of T6 in the sagittal plane, the position of the epidural catheter was inferred from observing dural displacement on injection of saline through the catheter. Dural displacement was identified more cephalad than T5/6 and the echo-dense epidural catheter could be seen at this level. This was confirmed by gently moving the catheter back and forth and it was slowly withdrawn until the tip came into view, and was positioned opposite T5/6 (Fig. 3). Levobupivacaine 0.25% (1.5 ml) was injected and both caudad and cephalad spread observed on ultrasound.
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At this second operation the CCAM mass was resected completely and identified as arising from the right upper lobe. The left lung appeared small and hypoplastic. A chest drain was inserted. The child was monitored in PICU overnight and required nasal CPAP for the first 2 h. Thereafter 0.5 litre min1 of oxygen by nasal cannula maintained satisfactory oxygenation. The following day the child maintained good respiratory function on air and was transferred to HDU, where the chest drain was removed 24 h later. The epidural was continued for 48 h at the rate of 0.3 ml kg1 h1. After epidural removal the child returned to the ward and was discharged home after 6 days.
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Discussion |
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The management of a 24-day-old baby is different from that for a 1-day-old as the lesion is more mature and the physiology and pathology is well defined. One-lung ventilation (OLV) improves surgical access and may reduce blood loss. CCAM may contain fluid varying from clear to purulent in nature. At the first thoracotomy, resection of the lesion had been impossible with positive pressure ventilation of both lungs. OLV allowed better surgical access, minimized trauma to the limited residual normal lung tissue,2 and protected normal lung from contralateral contamination. We used a 3 F Fogarty catheter as a bronchial blocker,3 which was placed parallel to the ETT. Alternatives include a balloon tipped angiography catheter or a 5 F paediatric bronchial blocker (Cook). Both can be passed into the bronchus using a guide wire and have the advantage of having an end hole allowing suction and collapse of the lung. The Cook blocker has the added advantage of a high volume low-pressure balloon. In small infants, the advantage may be offset by the greater diameter of the device. We could have also used a normal tracheal tube to intubate the normal lung alone but the disadvantages of doing this are difficulty in suctioning of secretions of the non-ventilated lung and obstruction of the left upper lobe bronchus.
Our plan was to extubate this child early to avoid positive pressure ventilation and the possible complications of barotrauma encountered after the first operation. Provision of good analgesia was therefore a priority. Studies in children suggest an epidural technique is better than morphine.4 5 We decided to insert an epidural catheter59 for analgesia because our patient had a stormy postoperative period after first thoracotomy. Bosenberg's work in 240 neonates undergoing major neonatal surgery showed significant benefit from epidural analgesia.5 We inserted a thoracic caudal catheter under ultrasound guidance as we had successfully used this technique in two previous cases. Incorrect positioning of a caudal cannula is common; the ultrasound saline test bolus confirms epidural position and rules out intravascular, intraosseous, or intrathecal placement. Ultrasound imaging allowed us to accurately position the catheter tip at the level of surgery and monitor the distribution of levobupivacaine. Other methods of confirming placement of epidural catheter have included ECG guidance (Tsui method7), electrical nerve stimulation and X-ray.9 Levobupivacaine is used for regional techniques in our instituition, at a rate of 0.10.3 ml kg1 h1 for 48 h.
We used remifentanil for its MAC sparing effect. Nitrous oxide was not used because of its potential for cyst expansion. Previous reports on the management of CCAM have not used remifentanil, and analgesia has been provided by epidural7 or morphine infusion. All patients required prolonged postoperative ventilation. Patients who have had postoperative ventilatory problems have been tried on high-frequency oscillation10 and extracorporeal membrane oxygenation has been used, as pulmonary hypertension can be a major cause of morbidity and mortality.11
In summary, OLV, remifentanil infusion, and ultrasound-guided thoracic caudal epidural is an effective technique in neonates undergoing major thoracic surgery.
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References |
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