Overview
Foreign body aspiration into the respiratory tract, particularly the lower airways, is a significant clinical concern, though it is less common in adults compared to children. In adults, aspiration can present acutely with choking or subacutely with chronic respiratory symptoms such as cough, without overt signs of distress like dyspnea, wheeze, or chest pain 1. Delayed diagnosis often occurs due to the absence of acute symptoms, leading to incidental findings during bronchoscopy for other respiratory conditions like lung collapse or unresolved pneumonia 12. Early identification and removal are crucial to prevent complications such as granulation tissue formation, abscesses, and chronic respiratory impairment. Prompt recognition and appropriate intervention are essential in day-to-day practice to avoid severe morbidity and potential mortality 12.Pathophysiology
The pathophysiology of foreign body aspiration in adults typically involves an initial mechanical obstruction in the airway, which can vary based on the size, shape, and location of the foreign body. Organic materials like bones, teeth, and vegetable matter often cause immediate obstruction and inflammation, leading to localized tissue damage and potential airway compromise 15. Over time, especially in chronic cases, the presence of a foreign body can induce a robust inflammatory response, promoting the formation of granulation tissue around the object. This encapsulation can complicate removal, necessitating advanced techniques such as electromagnet or cryotherapy to debulk the surrounding tissue before extraction 110. Additionally, chronic aspiration can lead to secondary infections, bronchiectasis, and atelectasis, further complicating the clinical picture 12.Epidemiology
The incidence of foreign body aspiration in adults is relatively low compared to pediatric populations, with most cases occurring in individuals with underlying neurological disorders, advanced age, or compromised airway protection mechanisms 15. Data from large cohort studies indicate that foreign body aspiration accounts for approximately 10% of cases referred for bronchoscopy, with a slight male predominance 1. Geographic and demographic risk factors are less defined but often correlate with occupational exposures (e.g., handling of small objects) and socioeconomic status 13. Trends suggest an increasing awareness and diagnostic capability, leading to earlier detection and intervention, though incidence rates remain stable due to the rarity of the condition 1.Clinical Presentation
The clinical presentation of foreign body aspiration in adults can be highly variable. Acute presentations often manifest with acute choking, coughing, and potentially life-threatening airway obstruction 15. Subacute or chronic presentations are more common, characterized by persistent cough, recurrent respiratory infections, localized wheezing, or unexplained hemoptysis 12. Asymptomatic cases may present incidentally with imaging abnormalities like atelectasis or localized infiltrates on chest X-rays or CT scans 1. Red-flag features include sudden onset of respiratory distress, cyanosis, fever, and signs of systemic infection, which warrant urgent evaluation and intervention 12.Diagnosis
The diagnostic approach for suspected foreign body aspiration involves a combination of clinical history, physical examination, and imaging studies, followed by bronchoscopy for definitive diagnosis and management. Specific Criteria and Tests:Management
Initial Management
Removal Techniques
Specific Steps:
Contraindications
Complications
Prognosis & Follow-up
The prognosis for adults with foreign body aspiration is generally good with prompt diagnosis and removal, though chronic cases may have lingering respiratory symptoms. Prognostic indicators include the duration of foreign body presence, extent of tissue damage, and presence of secondary infections. Recommended follow-up intervals typically include:Special Populations
Pediatrics
Children, particularly toddlers, are at higher risk due to exploratory behavior and immature airway protection mechanisms. Foreign bodies like plastic objects (e.g., bread tags, pen caps) are common and require vigilant monitoring and early intervention 46.Elderly and Neurological Conditions
Elderly patients and those with neurological disorders (e.g., Parkinson’s disease, stroke) have increased risk due to impaired swallowing reflexes and reduced airway protection 15.Comorbidities
Patients with comorbidities such as chronic obstructive pulmonary disease (COPD) or immunosuppression may experience more severe complications and require tailored management strategies 1.Key Recommendations
References
1 Fang YF, Hsieh MH, Chung FT, Huang YK, Chen GY, Lin SM et al.. Flexible bronchoscopy with multiple modalities for foreign body removal in adults. PloS one 2015. link 2 Peña EC, Aguilar-Viveros B, Silva-Hernández A, Puentes-Cruz C. Serial bronchoalveolar lavage as barium aspiration treatment. Case report. Boletin medico del Hospital Infantil de Mexico 2025. link 3 Kansal B, Swamy KM, Ramesh H, Kumar B. Unusual Foreign Bodies in the Respiratory Tract of Children. Indian pediatrics 2015. link 4 Karro R, Goussard P, Loock J, Gie R. The simple bread tag - a menace to society?. South African medical journal = Suid-Afrikaanse tydskrif vir geneeskunde 2015. link 5 Lin CY, Huang SF, Lan CC, Wu YK, Huang CY, Huang YC et al.. Fish fin aspiration: an unusual type of lower airway foreign body in a Chinese adult. Respiratory care 2013. link 6 Chen M, Zhang J, Liu W, Zhao J, Liu B, Zhang Y. Clinical features and management of aspiration of plastic pen caps. International journal of pediatric otorhinolaryngology 2012. link