Overview
Acquired laryngomalacia is a condition characterized by the softening and collapse of the supraglottic structures, leading to airway obstruction, particularly in infants and young children. This condition often coexists with other craniofacial anomalies such as Robin sequence, and can be exacerbated by underlying medical conditions such as congenital heart disease, central nervous system (CNS) abnormalities, and gastrointestinal (GI) issues. Acquired laryngomalacia can significantly impact respiratory function, necessitating interventions like mandibular distraction osteogenesis (MDO) to alleviate symptoms and improve quality of life. The management of acquired laryngomalacia requires a multidisciplinary approach, considering the complex interplay of anatomical, physiological, and systemic factors in affected patients.
Diagnosis
The diagnosis of acquired laryngomalacia typically involves direct visualization of the larynx through laryngoscopy. This procedure allows clinicians to observe the dynamic collapse of the supraglottic structures during inspiration, confirming the presence of redundant aryepiglottic folds and the epiglottis that obstruct the airway. [PMID:25915678] highlights that laryngoscopy was crucial in confirming laryngomalacia in all patients before proceeding with MDO, underscoring its importance as a definitive diagnostic tool. Additionally, clinical symptoms such as stridor, feeding difficulties, and episodes of apnea or hypopnea often precede and guide the need for laryngoscopic evaluation. In clinical practice, these symptoms, combined with imaging studies like flexible nasopharyngolaryngoscopy, help in establishing a comprehensive diagnosis and assessing the severity of airway compromise.
Management
The management of acquired laryngomalacia, especially in patients with Robin sequence, often involves surgical interventions such as mandibular distraction osteogenesis (MDO). A retrospective case series involving 75 patients demonstrated that MDO not only facilitated deep sedation and awake moments necessary for implant assessment but also minimized major complications. [PMID:30482475] reports that while transient hypopnea and bradycardia were observed as minor complications, these were generally manageable without long-term sequelae. Furthermore, [PMID:25915678] details a cohort of eleven infants with Robin sequence and laryngomalacia who underwent MDO, resulting in a significant reduction in the postoperative apnea-hypopnea index (AHI) from 46.1 ± 31.8 to 4.1 ± 3.0 (P = 0.002). This substantial improvement underscores the efficacy of MDO in alleviating respiratory distress. Importantly, all patients without pre-existing tracheostomies avoided the need for tracheostomy post-MDO, with one patient even achieving decannulation, highlighting the potential for functional airway recovery.
Key Management Steps
Complications
While MDO offers significant benefits in managing acquired laryngomalacia, it is not without potential complications. [PMID:30482475] reports that among the patients, 24% experienced transient hypopnea requiring supplemental oxygen, and 4% faced bradycardia necessitating pharmacologic treatment. These transient events, though manageable, underscore the importance of vigilant postoperative care. Additionally, [PMID:25915678] notes a more severe complication in one patient who died one year post-MDO due to complications related to complex congenital heart disease, emphasizing the critical need to thoroughly evaluate and manage underlying systemic conditions preoperatively. This highlights the necessity of a holistic approach that considers the patient's overall health status beyond the immediate airway pathology.
Additional Considerations
Prognosis & Follow-up
The prognosis for patients undergoing MDO for acquired laryngomalacia appears promising, with studies indicating successful long-term outcomes. [PMID:25915678] reports a mean follow-up period of 28 months, during which patients demonstrated significant improvements in respiratory function and quality of life. However, the need for continued monitoring cannot be overstated. One patient required surgical re-exploration due to postsurgical bleeding after discharge, highlighting the importance of extended follow-up to detect and manage late complications effectively. Regular follow-up appointments should include laryngoscopy, polysomnography, and clinical assessments to ensure sustained airway patency and address any emerging issues promptly.
Follow-up Recommendations
Special Populations
Patients with acquired laryngomalacia often present with a constellation of comorbid conditions that necessitate a multidisciplinary approach to care. [PMID:25915678] highlights that in their cohort, 18.2% had syndromic diagnoses, 36.4% had cardiac abnormalities, 9.1% had CNS issues, and 72.7% exhibited GI abnormalities. These findings underscore the complexity of managing such patients, requiring input from pediatricians, cardiologists, neurologists, gastroenterologists, and surgeons. Multidisciplinary teams can provide comprehensive care tailored to the unique needs of each patient, addressing not only the airway obstruction but also the broader spectrum of associated health issues. This collaborative approach is crucial for optimizing outcomes and improving the overall prognosis in these challenging cases.
Multidisciplinary Care Considerations
By integrating these specialized perspectives, clinicians can provide holistic care that addresses the multifaceted challenges faced by patients with acquired laryngomalacia and associated comorbidities.
References
1 Hamre MC, Ekbom DC, Handlogten KS, Weingarten TN, Seelhammer TG. Anesthetic Management for Medialization Laryngoplasty Performed Under Concurrent Dexmedetomidine, Remifentanil, and Propofol Infusions. Journal of voice : official journal of the Voice Foundation 2020. link 2 Tholpady SS, Costa M, Hadad I, Havlik RJ, Socas J, Matt BH et al.. Mandibular distraction for Robin sequence associated with laryngomalacia. The Journal of craniofacial surgery 2015. link
2 papers cited of 3 indexed.