Anaesthetic considerations for pectus repair surgery
Review Article on Thoracic Surgery

Anaesthetic considerations for pectus repair surgery

Chinmay Patvardhan, Guillermo Martinez

Department of Anaesthesia and Intensive Care, Papworth Hospital NHS Foundation Trust, Cambridge, UK

Contributions: (I) Conception and design: All authors; (II) Administrative support: Department of Anaesthesia and Intensive Care, Papworth Hospital; (III) Provision of study materials or patients: All authors; (IV) Collection and assembly of data: None; (V) Data analysis and interpretation: None; (VI) Manuscript writing: All authors; (VII) Final approval of manuscript: All authors.

Correspondence to: Guillermo Martinez. Department of Anaesthesia and Intensive Care, Papworth Hospital NHS Foundation Trust, Papword Everard, Cambridgeshire CB23 3RE, UK. Email: guillermo.martinez@nhs.net.

Abstract: Repair of pectus is one of the most common congenital abnormality for which patient presents for thoracic surgery. In recent years, innovative minimally invasive techniques involving video assisted thoracoscopy for pectus repair have become the norm. Similarly, anaesthetic techniques have evolved to include principles of enhanced recovery, multimodal analgesia and innovative ultrasound guided neuraxial and nerve blocks. Adequate anaesthetic set up and monitoring including the use of real time intraoperative monitoring with transesophageal echocardiography (TOE) has enabled the anaesthetist to enhance patient safety by providing instantaneous imaging of cardiac compression and complications during surgery. In this review article we aim to provide non-systematic review and institutional experience of our anaesthetic strategy to provide effective peri-operative care in this patient group.

Keywords: Pectus surgery; anaesthesia; neuraxial blocks; chest wall blocks; echocardiography


Received: 05 January 2016; Accepted: 04 February 2016; Published: 11 April 2016.

doi: 10.21037/jovs.2016.02.31


Introduction

Pectus excavatum (PE) and pectus carinatum (PC) is one of the commonest causes of chest wall deformities presenting for surgical correction in thoracic surgery; representing over 95–97% of cases (1). While vast majority are of cases are idiopathic, about 3–4% cases (1) may represent manifestation of congenital syndromes such as Poland syndrome, pentalogy of Cantrell, Spondylothoracic dysplasia (Jarcho-Levin syndrome) or asphyxiating thoracic dystrophy (Jeune syndrome). Connective tissue syndromes (2) such as Marfans and Ehler-Danlos syndrome may also present with pectus deformities. Anaesthetic management of pectus repair surgery is a unique challenge to anaesthetists, as it includes a diverse case mix of relatively young patients with a range of pathologic symptoms. In this review we aim to provide evidence based review of current anaesthetic practice and strategies of analgesia in adult population affected with this disorder.


Clinical presentation

Pectus deformities have a male preponderance (male/female ratio 3:2) and occur with an incidence of 1 in 400 live births (2). Although a detailed review of pathophysiology is beyond the scope of this article, a basic understanding of the pathology is essential for any anaesthetist embarking on anaesthetising for a repair of pectus. PE is caused by a dorsal deviation of sternum and third to seventh costal cartilage and ribs, which result in a funnel shaped deformity; while PC is characterised by a protrusive abnormality of the sternum and ribs caused by abnormal growth of ribs and costal cartilage. This results in progressive compressive/restrictive symptoms due to compression of lung and cardiac structures. While a majority of patients are asymptomatic and require surgery for cosmesis, a small minority of patients have symptoms related to progressively worsening cardio respiratory compression (3,4), scoliosis (2) and pain (1). Some patients may have symptoms related to mitral valve prolapse and regurgitation, although there is not an independent association between both mitral disease and pectus deformities (5). Coln et al. found a 95% incidence of ventricular compression in a case series of 123 patients with pectus (5). Cardiac arrhythmias (6,7) such as second degree heart block, right bundle branch block, Wolff-Parkinson-White syndrome, and exercise induced ventricular arrhythmias (8) have also been described. The severity of symptoms may become progressively worse in patients with a severe pectus deformity (9). Surgical correction in pectus patients aim to reverse these symptoms (10) and enhance body image (11).


Surgical techniques for correction of pectus

Surgery remains the keystone to correction of PE/PC in patients. Decision regarding timing of surgery is made based on a multidisciplinary approach taking into consideration symptoms, signs of cardiac and respiratory compression and patient choice. The severity of the pectus can be measured by the Haller index, which is obtained by dividing the lateral diameter by the antero-posterior diameter. The condition is said to be severe when it is >3.25 (normal value: 2.56) (12). There is no consensus at to what age surgery should be offered. Therefore these patients may present in paediatric as well as adult anaesthetic practice.

The classic technique of repair of PE described in surgical literature is the ‘open’ Ravitch procedure (13) which was first described in 1949. This involves exposure of the anterior thorax region with resection of the costal cartilages affected bilaterally, the performance of a cross sternal osteotomy with the placing of a stabilizer, and the development of muscular flaps (2). This technique involves extensive surgical dissection therefore requires an effective central neuraxial block like thoracic epidural for post-operative analgesia. Donald Nuss introduced a minimally invasive approach to surgical correction (14). This technique involves bilateral mid axillary incisions and insertion of retrosternal metallic bars, which is then fixed and stabilized to correct the defect using a video assisted thoracoscopic technique.

As surgical techniques evolve there is a wide variety of surgical techniques that are utilised for repair of pectus, but they remain modifications of initial procedures described above [e.g., Leonard modification (15) or Robiseck procedure (16)]. Modern techniques (minimally invasive repair of pectus excavatum) now involve using prosthetic material like a bioabsorbable mesh repair (17). These techniques have now allowed anaesthetists to use innovative and less invasive techniques such as chest wall blocks and paravertebral blocks (PVBs) to enhance patient recovery and outcome after surgery. Although a detailed understanding and review of surgical techniques involved in pectus surgery is beyond the scope of this article, a fundamental understanding of operative technique is vital in planning the anaesthetic technique and formulating a robust analgesic strategy in these patients.


Preoperative anaesthetic assessment

Patients presenting for pectus surgery is a diverse spectrum ranging from the otherwise physiologically robust young patients to patients who are affected with complex genetic syndromes. A robust medical and anaesthetic history should be taken in the pre-operative assessment clinic. Baseline cardiorespiratory functional capacity, and aerobic fitness is known to be diminished in patients with PE (18), and it has to be assessed before surgery. Allergies and intolerance are particularly important. In general, patients with history of surgery during childhood are at a risk of latex sensitisation, although it is more frequent in those with associated spina bifida (19). Metal allergies to implants have been described in medical literature (20). A careful history of allergies to nickel, cobalt or other metals, contact dermatitis should be obtained, as 10–15% of population (21) are sensitive to metals. An incidence of 2.8% (35 patients) of Bar Allergy was reported in a case series of 1,215 patients having a Nuss procedure (22) of which three patients had to be re-operated to have their bar removed. Some institutions have instituted pre-operative allergy testing in high-risk patients prior to surgery (23). Patients with prior nickel allergy can have titanium bars to avoid hypersensitivity; Preoperative assessment clinic also provides an ideal opportunity for patient education, discussions related to the anaesthetic approach, risks and benefits of proposed post-operative analgesic regime, and consent for invasive and semi-invasive monitoring such as arterial cannulation or transesophageal echocardiography (TOE).


General investigations

Patient should undergo standard preoperative haematological and biochemical investigations. Chest X rays have been in the past, a main stay of investigation of pectus repair. These should be carefully studied for not only for assessment of severity of pectus deformity/rib abnormality; but also should be carefully scrutinised for evidence of chronic infection (24). Pectus patients have been known to have recurrent mycobacterium avium complex infections (25). CT scan and MRI imaging have long superseded plain chest films and now are the gold standard for investigation. Haller index derived from measuring anteroposterior and side to side diameter of chest gives an index of severity (6). The position of mediastinal structures mainly the heart and great vessels should be carefully noted as these might be displaced or compressed. Compression of right ventricle is a commonly observed abnormality. In severe cases, the heart may become rotationally displaced into the left hemithorax (26). This displacement can cause mechanical compression and obstruction to normal outflow, which may impede normal stroke volume, especially during exercise (27).


Cardiac and respiratory investigations

For a vast majority of patients a standard 12 lead ECG will suffice. Holter monitoring may be considered for patients who have a history of palpitations. A small number of patients will need further investigations such as transthoracic or TOE. RV compression is a common abnormality (27). Mitral valve prolapse with mitral regurgitation is seen in 20% of patients with PE because of mechanical distortion of mitral annulus, and is restored back to normal in 50% after surgery for pectus repair (28).

Routine preoperative investigation with spirometry is not required as this might be frequently be normal. But this is commonly performed as part of the preoperative workup before considering surgery. Spirometry may show a restrictive defect with reduced forced expiratory volume in 1 second (FEV1). A one review of 557 patients presenting for pectus surgery, Goretsky et al. showed that a 26.1% had an forced vital capacity (FVC) <80% and 32% had an FEV1 <80% (29).

Limitation in exercise tolerance and dyspnoea can be associated with pectus deformity. Cardiopulmonary exercise testing (CPET) has been utilised to assess exercise capacity and physiological parameters in patients with PE/PC with conflicting results (30). Considerable difference in methodology has contributed to these conflicting results (27). A decrease in the O2 pulse (mL/beat) and amount of oxygen that could be delivered (VO2 L/min and Ve L/min) may be significantly below predicted values in patients with PE (3,31). Although this may prove to be a useful research tool for physicians to analyse the severity of symptoms of PC/PE, current medical evidence does not indicate a role for using CPET as a routine perioperative risk assessment tool in patients undergoing pectus surgery.


Preoperative preparation

Standard preoperative starvation guidelines (32) should be followed. Usually no premedication (anxiolytics) necessary, but may be used on case by case basis. A single retrospective cohort study published by Ghionzoli et al. showed a statistically significant reduction (P=0.0408) in post-operative opiate requirement in patients who received premedication with 0.02–0.1 mg/kg dose of lorazepam the day before undergoing Nuss surgery (33).


Multidisciplinary team briefing

Preoperative team briefing is increasingly becoming a standard part of operative practice in many countries across the world after introduction of the WHO checklist (34-36). This is a vital aspect of ensuring safety and quality in surgical/anaesthetic practice (37,38). This briefing should be used to confirm the following points prior to induction of anaesthesia:

  • Type of surgical procedure and critical steps anticipated;
  • Patient positioning;
  • Patient specific medical/anaesthetic/surgical issues;
  • Anaesthetic protocol (tubes, lines);
  • Plan for lung isolation if required;
  • Discussion about use of regional anaesthesia;
  • Risk of blood loss and confirmation of cross-matched sample being available in theatre;
  • Antibiotic prophylaxis;
  • Allergies.

This opportunity will help the team to correctly plan and facilitate anaesthesia around the surgical procedure, and provide a high standard of safe and appropriate patient care during and after the procedure (36).


Anaesthetic management

Standard anaesthetic monitoring (39) which includes 3 lead ECG, pulse oximetry should be used. Non-invasive blood pressure monitoring can be safely used for induction in majority of cases. However, invasive arterial monitoring is recommended prior to commencing surgery. Invasive arterial monitoring allows continuous blood pressure measurement during vital steps of surgery where dissection and manipulation of mediastinal structures occur. Initial intravenous access can be a medium size venflon (20 G/22 G), however, a wide bore i.v. cannula (e.g., 14–16 G) should be established under anaesthesia due to the risk of intra operative major hemorrhage. Central venous access is usually not necessary, but can be considered in complex surgical repair, or if patients co morbidities warrants it. This may also be considered if the patient has undergone previous thoracic/cardiac surgery, where dense adhesions increase the likelihood of blood loss.


Perioperative TOE monitoring

In a critical location, even small depressions of the chest can create significant cardiac dysfunction when the right heart and pulmonary outflow tract are compressed to varying degrees by the depressed sternum (5,32,40). The degree of compression of the right ventricle is often difficult to quantify in patients with preoperative transthoracic echocardiography. Perioperative TOE monitoring of the cardiac function in general and right ventricle in particular should be considered in pectus surgery. A comprehensive examination of the heart, including mitral valve and right ventricle dimensions and function is relevant in pectus surgery patients. The quantification the degree of right ventricular obstruction, monitoring for the manipulation of the ventricle during insertion of the bar (41) is useful. This can be best achieved using the mid oesophageal four chamber view and the right ventricle inflow-outflow view by rotating the probe to 45 degrees. There have been a number of case series reporting feasibility of perioperative TOE during pectus surgery (42,43). These have not only helped the anaesthetist to quantify and document the improvement in right ventricular function but also guide the surgical team in real time when performing retrosternal dissection (44). After insertion of the pectus bar, a TOE examination may help to identify pericardial/pleural collections, myocardial injury, or any iatrogenic valvular damage (43). A comprehensive examination of the mitral and tricuspid valve should also be performed before and after the procedure to exclude valvular injuries.


Anaesthetic technique

The technique and conduct of anaesthesia we discuss is relevant to both an open (Ravitch) and minimally invasive repair of pectus excavatum (Nuss) procedures or its modifications. Under this section we would describe the anaesthetic and analgesic techniques widely used in pectus surgery under separate headings of induction and Central and peripheral neuraxial blockade.

Induction and maintenance of anaesthesia

Although any induction agent can be used; induction of anaesthesia is commonly performed using propofol (1.5–3 mg/kg) with an opiate like fentanyl (0.1–0.2 mcg/kg). Co-induction with small dose of midazolam (1–2 mg) given prior to induction can provide effective anxiolysis and has a propofol sparing effect (45,46) along with reduction in postoperative opiate requirement (29).

Any medium to long acting muscle relaxant can be used (e.g., rocuronium, atracurium, cisatracurium) for tracheal intubation. Rocuronium (1–1.5 mg/kg) has a particular advantage of rapid onset, long effect, minimal histamine release and potential rapid reversal with sugammadex (47) in case of failure to intubate.

Such a balanced anaesthetic induction can be maintained with a mixture of air & oxygen with halogenated gas such as sevoflurane or desflurane which have rapid reversal profile. Nitrous oxide should be avoided because the risk of pneumothoraces during the procedure (48) and also because of its effect on post-operative nausea and vomiting (49) which could be particularly harmful due to the presence of the prosthesis and reconstruction. The anaesthesia could be supplemented with a continuous intraoperative epidural infusion or an intravenous target controlled remifentanil infusion (0.1–0.5 mcg/kg/min). Both these techniques provide excellent intra operative analgesia. Remifentanil infusion has the added advantage of reducing stress response to sternotomy (50), rapid titrability, a favorable context sensitive half time (51) allowing for rapid recovery, reducing coughing (52,53) and bucking on extubation.

Total intravenous anaesthesia (TIVA) using target-controlled infusion of propofol and remifentanil is also a well-established anaesthetic technique. There are no studies comparing balanced anaesthesia with volatile agents and TIVA in pectus surgery. There is some evidence in thoracotomy patients to indicate a potential benefit of using propofol infusion to reduce post thoracotomy chronic pain (53,54). However, this has not been confirmed in large multicentre randomized control trial, therefore still remains a subject of scientific research. It is recommended that depth anaesthesia monitoring (e.g., bi-spectral index or entropy) is used to reduce the risk of awareness (54). If TIVA is used to provide anaesthesia, it is important to administer adequate muscle relaxant irrespective of the technique used to achieve paralysis of the diaphragm, as TIVA does not contribute to diaphragmatic muscle relaxation (55-57).

The choice of tube used for tracheal intubation is dictated by the surgical procedure. Nuss repair requires lung isolation so that the surgeon can dissect the retrosternal space, and correctly position the retrosternal prosthesis with a video thoracoscopic assisted technique. Ravitch procedure on the other hand is an open procedure and a normal endotracheal tube will suffice. However with increased surgical expertise, minimally invasive Nuss procedure can be performed with a normal single lumen endotracheal tube with creation of an artificial pneumothorax with carbon dioxide insufflation (2). If lung isolation is required then a bronchial blocker may be used in these circumstances.

If the surgical correction requires lung isolation, a left sided double lumen tube (2) can be used. Tube position should be confirmed on intubation and once again after positioning the patient with a fiber-optic bronchoscope. Lung isolation might be difficult in patients with Marfans syndrome using a standard tube size and may require a bigger tube size.

Central and peripheral neuraxial blockade

Since the very beginning, central neuraxial blockade was used to provide analgesia for patients undergoing Ravitch procedure because of the potential for severe pain (13,58-61). Although Nuss repair is a minimally invasive thoracoscopic technique, studies cited in medical literature have shown that the perioperative pain is at the least comparable with open repair techniques such as Ravitch procedure (48,59). Pain management following surgery has been shown to affect all measurable objective outcomes during hospitalization, which includes the capacity for deep breathing, the capacity of early mobilization, the possibility to perambulate, and the length of hospital stay (62). Severity of pectus deformity has been shown to be an independent predictor of post-operative pain in patients undergoing surgery (63). Nagasao et al. have demonstrated that pain after pectus surgery has a different distribution in children and adults (64). However, there was no difference in the pain scores of adults and children after surgery.

Thoracic epidural anaesthesia

The standard of perioperative analgesia in most institutions remains a thoracic epidural analgesia (TEA) with a catheter inserted at level T3–5 before anaesthetic induction (2,15,22,65). Epidural analgesia is provided for at least 3 days (66). Thoracic epidural has been found consistently superior compared to intravenous analgesia with opiates in clinical trials resulting in lower postoperative pain scores in conjunction with greater patients well-being (67-70). One study reported a longer operating room time, increase in calls for an anesthetic review, and greater hospital charges with epidural analgesia after repair of PE, but consistently showed a good pain control with TEA (69). However, thoracic epidural can be difficult to insert especially in adults, and is associated with a failure rate of about 30% (71). TEA is also associated with potentially severe complication of epidural hematoma. The exact incidence of epidural hematoma associated with thoracic epidural insertion is difficult to quantify as the important studies estimating the risks of complication after epidural insertion such as NAP3 (72) include lumbar epidurals and a varied case mix patients. A pessimistic estimate in this study suggests a rate of 4.2 (95% confidence interval, 2.9–6.1) per 100,000 patient population.

Epidural opiates such as fentanyl (73), sufentanil (74), diamorphine, morphine (75) are commonly added to improve the quality of analgesia with epidurals. Other adjuncts such as clonidine have been studied in paediatric anaesthetic practice and have found to have a comparable efficacy for patient undergoing Nuss repair (76). This strategy is not without potential complications such as respiratory depression with hydrophilic opiates such as morphine, pruritus, post-operative nausea and vomiting or urinary retention.

Paravertebral block (PVB)

Paravertebral nerve blocks have been commonly performed in thoracic surgery as an adjunct to anaesthesia and analgesia after surgery. Thoracic PVB may be a suitable alternative in thoracotomy patients, where only a unilateral sensory block is desirable (77). Bilaterally inserted PVB (78,79) have been used in paediatric surgical practice. In this study bilateral paravertebral catheters resulted in equivalent opioid consumption and pain scores when compared to TEA for postoperative pain management in pediatric patients undergoing the Nuss procedure. However, larger studies in adult population are lacking. Paravertebral catheters inserted during surgery can be potentially utilised in adult patients as an alternative to epidural catheters in case of an absolute contraindication, or failure to site an epidural. Larger volumes of local anaesthetic (>20 mL) are required for an effective PVB. Paravertebral space being a potentially vascular space, there is a potential risk of local anaesthetic toxicity. Addition of epinephrine to the local anaesthetic solution may delay absorption of local anaesthetic from the space and mitigate the risk of local anaesthetic toxicity. Bilateral PVBs have been successfully used in thoracic surgery and may be an alternative for patients in whom epidural is contraindicated or unsuccessful, but there is a concern about local anaesthetic toxicity due to the large volume of it required for the blocks to be effective (80). Recent studies have suggested a beneficial effect of PVB in reducing the incidence of chronic pain after thoracic surgery and this might be an avenue to explore in pectus surgery (81).

Intercostal nerve blocks

As experience with minimally invasive pectus repair techniques grows, centres across the world have started increasingly using intercostal nerve blocks in combination with multimodal analgesia (NSAIDS + opiates) to treat patients instead of inserting epidural catheters in paediatric population. These studies have reported comparative analgesic efficacy with reduced length of stay and cost benefit (82,83). Again larger randomised controlled studies in adult patients are lacking. Nonetheless, there is evidence of reduced post-operative opiate requirement after intercostal blocks in paediatric population (84). Despite this bilateral intercostal blocks have been used in combination with multimodal analgesic techniques in adults (85,86) in pectus surgery.

Other chest wall blocks

Sternal nerve supply is from the 2nd to 6th intercostal nerve. A number of nerve blocks have been described to provide analgesia after sternotomy. One approach it to perform bilateral parasternal block (87), which is essentially infiltration of local anaesthetic under direct vision. A novel technique of ‘pectoralis block’ (commonly known as ‘PECS Block’), which involves infiltration of local anaesthetic in the fascial plane between pectoralis major and minor has been described by Blanco (88). This has been shown to provide effective analgesia of the thoracic wall comparable to thoracic PVB (89,90). Pecs I block is an interfascial plane block where local anaesthetic is deposited into the plane between the pectoralis major muscle and the pectoralis minor muscle (Pecs I block). If the anaesthetic is also deposit above the serratus anterior muscle at the third rib the technique is described as Pecs II block. These novel techniques attempt to block the pectoral; intercostobrachial; intercostals III, IV, V, VI; and long thoracic nerves. These techniques have been found effective in management of pain after breast surgery (91), and provide exciting alternative to be explored in pectus surgery especially minimally invasive techniques. The “Serratus nerve block” has been recently described in medical literature. This involves an ultrasound guided injection of local anaesthetic superficial or deep underneath serratus anterior. In a volunteer study (n=4) demonstrated dermatomal paraesthesia from T2 to T9 and numbness in all volunteers (92). These new blocks have the potential of being important adjuncts in chest wall surgery and promise to be a good alternative for patients with contraindications for neuraxial techniques such as epidural or PVB. Further research is needed to scope its use in routine clinical practice.


Intraoperative management

Patient should be positioned according to surgical preference. Care should be taken to avoid brachial plexus injuries in patients undergoing Nuss repair (93). In a recent publication of a single centre experience of 90 paediatric patients undergoing Nuss repair reported a 5.2% incidence of brachial plexus injury directly related to positioning (94). Ulnar nerve damage has also been reported in literature (95). Temperature monitoring and external body warmer should be instituted to avoid inadvertent perioperative hypothermia. Fluid management should be goal directed avoiding fluid overload using a balanced crystalloid. Cardiac output monitoring devices such as oesophageal Doppler or direct visualisation of left ventricular volume status with a TOE probe may be utilised for this purpose. All patients should receive antiemetic prophylaxis. A multimodal analgesia approach is paramount and it may include that include paracetamol, non-steroidal anti-inflammatory agent (e.g., ketorolac, Parexocib, etc.) and opiates. The use IV ketorolac given intraoperatively has demonstrated to reduce post-operative opiate requirement in pectus surgery (64).


Perioperative TOE monitoring

In a critical location, even small depressions of the chest can create significant cardiac dysfunction when the right heart and pulmonary outflow tract are compressed to varying degrees by the depressed sternum (5,30,40). The degree of compression of the right ventricle is often difficult to quantify in patients with preoperative transthoracic echocardiography. Perioperative TOE monitoring of the cardiac function in general and right ventricle in particular should be considered in pectus surgery. A comprehensive examination of the heart, including mitral valve and right ventricle dimensions and function is relevant in pectus surgery patients. The quantification the degree of right ventricular obstruction, monitoring for the manipulation of the ventricle during insertion of the bar (41) is useful. This can be best achieved using the mid oesophageal four chamber view and the right ventricle inflow-outflow view by rotating the probe to 45 degrees. There have been a number of case series reporting feasibility of perioperative TOE during pectus surgery (42,44). These have not only helped the anaesthetist to quantify and document the improvement in right ventricular function but also guide the surgical team in real time when performing retrosternal dissection (44). After insertion of the pectus bar, a TOE examination may help to identify pericardial/pleural collections, myocardial injury, or any iatrogenic valvular damage (43). A comprehensive examination of the mitral and tricuspid valve should also be performed before and after the procedure to exclude valvular injuries.


Intraoperative complications in pectus surgery

Although minimally invasive, Nuss repair and its modifications are associated with some important potential complications. Anaesthetist should remain vigilant during and after surgery to diagnose these early and initiate immediate treatments (see Table 1). The major intraoperative complications include perforation of the right ventricle and vascular injuries leading to life-threatening haemorrhage. Cardiac perforation, liver perforation, aortic injury, inferior vena cava compression, intercostal artery bleeding have all been described in literature (22,43,96-100). These can be proactively monitored with intraoperative TOE. Transgastric short axis view and its modifications, and the mid-oesophageal four chamber views of the left ventricle can be best utilised for detection of a cardiac tamponade. Rotation of the TOE probe in the mid oesophageal position can also help in demonstrating presence of fluid in the pleural space, which can alert the surgeons to potential sources of bleeding.

Table 1
Table 1 Perioperative complications associated to pectus repair surgery
Full table

Probe inserted in deep transgastric position can also help to demonstrate presence of free fluid around the liver capsule and inferior vena cava compression by rotating the probe position to the right. Management of cardiac injuries may require institution of emergency cardiopulmonary bypass (101). Minor complications include lung trauma, pericardial tears, pleural and pericardial effusion that do not require treatment (77-79).

Residual pneumothorax requiring chest drain after the operation is quite common (>50% cases) (77), and some experts advocate deep extubation to avoid coughing in these patients (67).


Postoperative care

If a regional analgesic technique is used (e.g., epidural,) it should be established prior to extubation. Intercostal blocks should be considered for additional drain sites. If epidural is not used then intravenous opiates like fentanyl, morphine (with a patient controlled analgesia system) need to be used as part of multimodal analgesic regimen (53,55,102). Ketamine has been used as an adjunct to IV opiates (85). Intercostal blocks can also be used as a rescue analgesic technique in recovery in cases of epidural failure (103).

Studies have shown that patients with after Nuss surgery still experience significant pain up to day 7 (104) and epidural may need to be supplemented with IV opiates and other adjuncts. A significant proportion of pain after thoracic surgery is neuropathic in origin (105). Gabapentin is a useful adjunct which has been successfully evaluated as an analgesic in thoracic surgery (106-109).

Lung atelectasis and pneumonia in post-operative period is common after repair of pectus (110). High flow humidified oxygen delivered with special nasal cannula (e.g., OptiflowTM) in combination with respiratory care can help in reducing post-operative respiratory complications in this patient group (111-113).

Patients should be encouraged to ambulate early, and undertake regular breathing exercises.

Patients are usually counselled in the preoperative clinics and should be reminded to avoid lifting heavy weights or lying on one side after the procedure. They should also avoid bending at the waist or pushing through their arms (114).


Conclusions

Pectus surgery is carried out across a range of age group. Minimally invasive surgical techniques have increasingly been used to repair the deformities. With increasing surgical expertise, the need for anaesthesia requiring lung isolation has been reduced. Intraoperative monitoring with TOE can minimise the catastrophic complications associated with the procedure. A general anaesthesia supplemented with good analgesic technique is crucial to the success of the surgery and reducing perioperative complications. Analgesic techniques are evolving with many centres now using multimodal techniques, which include regional blocks, newer peripheral nerve blocks, and effective analgesics.


Acknowledgements

None.


Footnote

Conflicts of Interest: The authors have no conflicts of interest to declare.


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doi: 10.21037/jovs.2016.02.31
Cite this article as: Patvardhan C, Martinez G. Anaesthetic considerations for pectus repair surgery. J Vis Surg 2016;2:76.

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