Minimally Invasive Repair Pectus Excavatum |
| Pectus
excavatum is the most common congenital chest wall deformity,
characterized by a posterior depression of the sternum and adjacent
costal cartilages that gives the chest a sunken appearance. It occurs
in approximately one in every 300 to 400 live births and shows a marked
male predominance, affecting boys roughly four to five times more often
than girls. This apparent sex disparity may be partly artificial, as
breast tissue can conceal the severity of the defect in female
patients, leading to underdiagnosis. The deformity typically becomes
more pronounced during the pubertal growth spurt, when rapid skeletal
development accentuates the depression, and the chest wall becomes
progressively less flexible as the patient ages. The clinical significance of pectus excavatum spans a spectrum from a purely cosmetic concern to a source of meaningful cardiopulmonary compromise. The inward displacement of the sternum most commonly compresses the right-sided chambers of the heart, displacing the heart toward the left chest and reducing stroke volume, cardiac output, and both diastolic and systolic function. Many patients report exercise intolerance, fatigue, dyspnea on exertion, palpitations, and chest pain, and functional testing frequently demonstrates reduced maximal oxygen consumption. Historically the condition was dismissed as a cosmetic problem alone, but accumulating evidence now shows that cardiac performance may be reduced measurably and that surgical correction can restore normalized cardiopulmonary function. Importantly, the psychosocial burden should not be discounted; body image concerns, diminished self-confidence, social avoidance, anxiety, and depression are all well documented, and quality-of-life measures improve substantially following repair. For roughly half a century, surgical correction relied on open techniques involving resection of the deformed costal cartilages, sometimes combined with a sternal osteotomy, to reposition the sternum. This open approach, refined over decades, remained the standard until the late 1990s, when a minimally invasive technique was introduced. This method requires no cartilage resection or sternal osteotomy. Instead, a curved metal bar is passed behind the sternum under thoracoscopic guidance and rotated so that its convexity elevates the depressed area from within. The bar is secured to the chest wall and left in place for a period of years while the chest remodels, after which it is removed. The minimally invasive procedure rapidly became the standard of care, particularly for pediatric and adolescent patients, owing to its smaller incisions, shorter operative time, minimal blood loss, and excellent cosmetic outcomes. Its adoption fueled a dramatic rise in the number of patients seeking correction, driven in part by greater awareness spread through the internet. Preoperative assessment combines clinical examination with imaging. Thoracic imaging, using either computed tomography or magnetic resonance imaging, allows measurement of the Haller index, calculated by dividing the transverse diameter of the chest by the anteroposterior distance between the sternum and spine at the deepest point. A value above 3.2 to 3.25 has traditionally justified surgical repair, though this threshold has notable limitations. Abnormal values can appear in otherwise normal chests, and some severely affected patients fall below the cutoff, so the index does not correlate reliably with physiologic symptoms. The correction index has emerged as a more accurate estimate of severity. Additional evaluation may include electrocardiography, echocardiography, pulmonary function testing, and cardiopulmonary exercise testing, particularly when comorbidity such as a connective tissue disorder is suspected or when the case is more complex. Metal allergy screening is advisable when there is a personal or family history of allergic reactions, since the standard bars contain nickel and other components that can provoke sensitization. The optimal timing of surgery remains debated. Many surgeons prefer to operate near the onset of puberty, when the chest wall remains soft, elastic, and easily manipulated, with broad agreement that the best results are obtained between roughly 13 and 16 years of age. Operating too early carries a higher risk of recurrence if the bar is removed before puberty, while adult repair, though feasible, is technically more demanding. The calcification and rigidity that accompany aging make sternal elevation more difficult, increase the force distributed to the bars, and raise the risk of bar displacement. Nevertheless, successful repair has been reported in patients well into their seventies, and adult correction continues to increase, with symptom resolution and satisfying cosmetic results achievable when appropriate technical modifications are applied. Several modifications have improved the safety and durability of the procedure. Routine thoracoscopy provides direct visualization during the retrosternal dissection and has become widely accepted as a minimum standard to reduce cardiac injury, the most feared and potentially lethal complication. Cardiac perforation is most likely during dissection in patients with previous open cardiac surgery, in whom dense adhesions bind the sternum to the myocardium, and in those with very deep or stiff chests. Sternal elevation techniques—including crane systems, retractors, subxiphoid approaches, hooks, and the vacuum bell applied intraoperatively—expand the retrosternal space and facilitate safe bar passage, further decreasing the incidence of near-fatal events. The use of multiple bars distributes corrective forces across a broader area, improves correction in stiff or complex chests, and reduces displacement. The cross-bar technique, in which two bars are crossed beneath the sternum with their lateral ends resting on the lower rib cage, is particularly useful for severe deformities with costal flaring, avoiding lateral chest wall depression while correcting flaring. Bar stability depends heavily on correct positioning. The bar must enter and exit the chest medial to the highest point of the deformity; if placed too laterally, it fails to elevate the sternum and may strip the intercostal muscles, leading to instability and recurrence. Numerous fixation strategies—lateral and medial stabilizers, pericostal sutures, multipoint suture fixation, hinge plates, and claw fixators—have reduced the rate of bar displacement from historical highs to around one percent. Shorter bars have also been adopted to reduce the risk of flipping. Complications, though relatively uncommon in experienced hands, span a range of severity. Pleural effusion and pneumothorax are almost universally present but rarely require intervention. Bar displacement, once the most common late complication, has fallen dramatically with improved fixation. Overcorrection into a carinatum shape, metal allergy, wound infections, and, rarely, life-threatening hemorrhage from mediastinal or internal mammary vessels can occur. Notably, serious complications can arise not only during placement but also during bar removal, which should therefore be performed in a setting equipped to manage catastrophic bleeding. Recurrence rates remain low when bars are left in place for an adequate interval, generally two to three years or longer in complex cases. Postoperative pain is the defining challenge of this operation. Paradoxically, despite its minimally invasive nature, the procedure may cause more pain than its open counterpart, because the substernal bar exerts sustained upward force on an intact chest wall and acutely stretches the intercostal nerves until bone and cartilage remodel. Pain and opioid-related side effects are the principal determinants of hospital length of stay, making effective analgesia central to recovery. Traditional approaches relied on thoracic epidural analgesia and patient-controlled analgesia, but these have limitations including variable efficacy, prolonged stays, and complications. Modern practice emphasizes multimodal, opioid-sparing strategies. Regional techniques—including paravertebral, erector spinae plane, serratus anterior plane, and intercostal nerve blocks—and non-opioid adjuncts such as acetaminophen, nonsteroidal anti-inflammatory drugs, gabapentinoids, ketamine, dexmedetomidine, and methadone all contribute. The most transformative advance has been intercostal nerve cryoablation, which induces temporary degeneration of the intercostal nerve axons, halting pain transmission for weeks until regeneration occurs. Cryoablation has been shown to reduce hospital stay substantially—in one randomized trial from around five days to three—and to decrease opioid consumption compared with epidural analgesia. Its main limitation is a delayed onset of up to a day, so it is best combined with a direct-acting regional block or systemic analgesia to bridge the early postoperative period. When cryoablation is paired with an adjunct analgesic intervention, it appears superior to all other modalities in shortening hospitalization, and refined multimodal protocols have made same-day discharge feasible for a majority of patients. Neuropathic pain is a recognized risk, more common in adults than children, but rarely requires treatment. The incorporation of these techniques into enhanced recovery pathways—combining preoperative education, multimodal analgesia, early mobilization, early oral intake, and prompt removal of catheters—has standardized care and improved outcomes. Even so, roughly one-third of patients require a short course of opioids in the immediate postoperative period. Together, these surgical and analgesic refinements have made minimally invasive repair of pectus excavatum a safe, effective, and increasingly well-tolerated operation with excellent long-term cosmetic and functional results. References: 1- Pilegaard H, Licht PB. Minimal Invasive Repair of Pectus Excavatum and Carinatum. Thorac Surg Clin. 27(2):123-131, 2017 2- Goretsky MJ, McGuire MM. Complications associated with the minimally invasive repair of pectus excavatum. Semin Pediatr Surg. 27(3):151-155, 2018 3- Haecker FM, Krebs TF, Kleitsch KU. Current Development of Minimally Invasive Repair of Pectus Excavatum (MIRPE). Children (Basel). 9(4):478, 2022 4- Aly MR, Farina JM, Botros MM, Jaroszewski DE. Minimally invasive repair of pectus excavatum in adults: a review article of presentation, workup, and surgical treatment. J Thorac Dis. 15(9):5150-5173, 2023 5- Brussels AR, Kim MS. Perioperative considerations in anesthesia for minimally invasive repair of pectus excavatum, Nuss procedure. Semin Pediatr Surg. 33(5):151459, 2024 6- Chiu MZ, Li R, Koka A, Demehri FR. Pain management after pediatric minimally invasive repair of pectus excavatum: a narrative review. Transl Pediatr. 13(12):2267-2281, 2024 7- Van Polen EJ, Franssen CJ, Daemen JHT, Isabella AJ, Franssen AJPM, Hulsewé KWE, Vissers YLJ, de Loos ER. Postoperative Pain Management After Minimally Invasive Repair of Pectus Excavatum: A Systematic Review and Network Meta-analysis. J Pediatr Surg. 60(6):162282, 2025 |
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