Suspected Foreign Body Aspiration Research Articles

Predictive Accuracy of Conventional Clinico-radiological Indicators in Foreign Body Aspirations among Children: A Retrospective Study

Introduction: Foreign Body Aspiration (FBA) is a common and serious paediatric emergency condition. A Suspected Foreign Body Aspiration (SFBA) is based on Clinical History (CH), Physical Findings (PF), and Chest Radiograph (RAD/CXR). The predictive accuracy of these factors as indicators of FBA and to perform Rigid Bronchoscopy (RB) based on these factors has been debated. Aim: To evaluate the sensitivity, specificity, positive predictive value and negative predictive value of clinical history, physical findings and radiology in SFBA. Materials and Methods: A retrospective analysis was conducted on paediatric patients with suspicion of foreign body aspiration, admitted in the Department of Paediatric Surgery at Government Medical College, Thiruvananthapuram, Kerala, India, between January 2006 and December 2020. Factors in CH, PF, and RAD were subjected to univariate and multivariate analysis to evaluate the predictive accuracy of these factors as indicators for bronchoscopy. Sensitivity, specificity, positive and NPV were calculated for the clinico-radiological indicators in predicting FBA. The association between evidence of FBA and clinico-radiological indicators was evaluated by Pearson Chi-square test; and p-values <0.05 were considered to be statistically significant. Results: A total of 458 children (263 males and 195 females) were admitted with SFBA having mean age of 29.49±24.92 months, 389 had confirmed FBA, and 69 had no FBA. The age group of 1-2 years was found to be a statistically significant factor for FBA (p-value=0.03). Foreign Body aspiration Witnessing Event (FBEW) (p-value <0.0001, sensitivity=91%, specificity=31%), choking spell (p-value <0.0001, sensitivity=95%, specificity=25%), acute cough (p-value <0.0001, sensitivity=87%, specificity=46%), tachypnea (p-value <0.0167, sensitivity=89%, specificity=20%), decreased breath sound (p-value <0.0001, sensitivity=92%, specificity=35%), abnormal CXR (p-value <0.0001, sensitivity=94%, specificity=37%) and hyperinflation (p-value <0.0001, sensitivity=95%, specificity=31%) were found to be independent statistically significant factors in FBA. Multivariate analysis showed a PPV of 97% when the aspiration event was witnessed along with abnormal physical and radiological findings. Conclusion: It was observed that assessment of clinico-radiological parameters is valuable in predicting FBA. The indications of RB in SFBA can be safely based on these clinico-radiological parameters.

Management of Adults With Suspected Foreign Body Aspiration

Objective: Although foreign body aspiration (FBA) in adulthood is not as common as in childhood, it can sometimes be encountered with clinical situations that require urgent interventions. Removal of foreign bodies (FBs) is crucial in all cases of aspiration, even if they seem trivial and symptoms have resolved. Unremoved FBs cause chronic lung pathologies such as postobstructive pneumonia, bronchiectasis, atelectasis and scar formation which can be definitely treated only by FB removal. The treatment of choice is either fiberoptic or rigid bronchoscopy.
 The aim of our study was to create an algorithm for the management of patients presenting to our bronchology and interventional pulmonology unit with suspected FBA by reviewing their radiologic findings, the bronchoscopic methods used in their management and outcomes.
 Methods: We retrospectively reviewed the medical records of 70 patients who underwent fiberoptic bronchoscopy (FOB) and rigid bronchoscopy (RB) for suspected FBA in our bronchology and interventional pulmonology center between January 2010 and December 2019.
 Results: There were 70 patients with suspected FBA, who had an average age of 47.22±20.76 years, and 62.8% were males. Twenty-nine (41.4%) were treated with FOB and 25 (35.7%) with RB. A FB was detected initially by FOB in 16 (22.9%) who subsequently had to undergo RB for FB removal. Fifteen (33.3%) FOB and 9 (21.9%) RB procedures were performed on an emergent basis.
 A total of 86 bronchoscopic treatments were performed on 70 patients. FBs were detected with FOB in 29 patients. The FB was removed in 13 (28.8%) patients with the help of FOB, while 16 (35.5%) patients in whom FB removal was not possible were referred to the interventional pulmonology unit for RB. In the remaining 16 (35.5%) patients, no FB was found during FOB. A total of 41 patients were treated with RB, including 16 patients who had initially undergone FOB. FB was detected and removed in 38 (92.6%) patients, 2 (4.8%) patients had no FB detected and received no further treatment after being consulted with thoracic surgery. One (2.4%) patient in whom FB was detected but could not be removed was referred to surgery and was operated.
 Rates of FB detection were high for both chest x-ray and unenhanced thoracic computerized tomography (CT) in favor of CT (p=0.038 and 0.022 respectively). Thirty-three (58.9%) of the FB removed were in the right bronchial system and composition of FBs (organic or inorganic) was equal.
 Conclusion: When thoracic CT is not available chest x-ray can also be helpful in cases of suspected FBA. Because the possibility of FBA should be considered in many chronic pulmonary conditions, physicians choose FOB for their initial evaluation, especially if transfer to an interventional pulmonology unit is not feasible. RB performed by interventional pulmonologists is a safe therapeutic option in critical patients and cases when FOB fails.

Tracheobronchial foreign body aspiration: A 13-year retrospective analysis

Introduction. Foreign body aspiration into the respiratory tract remains a diagnostic and therapeutic challenge in clinical practice, especially in young children, who are the most frequently affected age group. The aim of this study was to present the results of treating the patients with foreign body aspiration in all age groups. Material and Methods. The medical and radiological records of 64 patients with confirmed foreign body out of 146 patients with suspected foreign body aspiration were retrospectively analyzed during the period of 13 years (from 2001 to 2013). Results. A foreign body was found in 64 (44%) of the 146 patients of all age groups with suspected foreign body aspiration. The patients? age ranged between 11 months and 80 years. There were 84% children and 16% adults, and 63% of patients were male. Time between the moment of aspiration and admission to the Department ranged between 0.5 hours and 14 days, with majority of patients (70%) being admitted during the first 24 hour. History of respiratory drama was present in 92% of patients. Physical and radiological findings were positive in 66% and 47% of patients, rescpectively. Organic vegetable foreign bodies accounted for 75% of all cases, and they were most frequently found in the right main bronchus (63%). All foreign bodies were successfully extracted by rigid bronchoscopy, without serious complications and fatal outcomes. Conclusion. Bronchoscopy should be performed in any case of suspected foreign body aspiration, even if clinical and radiological findings are normal, in order to avoid serious and possible life-threatening complications. More should be done to raise awareness of this potentially preventable condition.

Foreign Body Aspiration in Adults and in Children

Foreign body (FB) inhalation is a potentially life-threatening emergency also in clinically stable patients as the situation could worsen at any moment. There is varying opinion regarding the urgency for removal of inhaled FBs, and there are no guidelines in the literature. The aim of our study was to present our experience with FB aspiration in children and adults from 1993, when we introduced our Thoracic Endoscopy Service with the availability "on call" of a bronchologist 24 hours a day, 7 days a week, defining a dedicated protocol together with our anaesthesiologists for prompt intervention in this situation. We consulted our database and examined the records of all patients undergoing bronchoscopy for suspected FB aspiration from 1993 onwards; our previous experience of 11 children and 14 adults with FBs from 1981 to 1992 was also included to compare the results obtained. In this period, we removed 159 FBs (in 70 children and 89 adults) and performed 23 negative bronchoscopies in children and 6 in adults for suspected aspiration. All FBs were removed successfully. We were able to intervene immediately also in critical situations: in 60/70 children within 24 hours of admission to hospital, in 44 of these 60 on the actual day of admission, thus avoiding a potentially dangerous delay between aspiration and removal. We had no complications, and no patients needed surgery. We conclude that an efficient organization involving a dedicated protocol of intervention, trained staff available 24 hours a day, 7 days a week, appropriate setting, and the right instrumentation enabled us to tackle this important emergency.

Questioning the legitimacy of rigid bronchoscopy as a tool for establishing the diagnosis of a bronchial foreign body

Objectives Rigid bronchoscopy (RB) is the principal method used for the extraction of a tracheo-bronchial foreign body (FB), but its use as a diagnostic tool implies a certain rate of negative exams, exposing the child to the risk of procedure and anesthesia-related complications. Technological progress has improved the accuracy and availability of non-invasive modalities, such as CT scan and fluoroscopy. Our aim is to review our experience in the routine use of bronchoscopy for a suspected FB aspiration, and evaluate the adequacy of our current attitude in light of these alternatives. Methods We performed a retrospective review of cases where bronchoscopy was used in the management of a suspected airway FB, and analysis of the correlation between the clinical and radiological data and the bronchoscopy's results. In addition we reviewed the literature concerning the use of RB and alternative means of diagnosis such as CT scan, fluoroscopy and flexible bronchoscopy. Results Thirty-two patients underwent bronchoscopy to rule out a FB aspiration under general anesthesia. No FB was found in 8 cases (25%). Cough and a history of choking were the most sensitive parameters (sensitivity 100% and 80% respectively), but had a low specificity. Stridor was the most specific sign (88% specificity), but was not sensitive. Chest radiography had 25% sensitivity, and 62.5% specificity. Flexible bronchoscopy changed the management in 22% of cases, sparing RB. Conclusions Basing the decision to perform RB solely on the clinical findings and chest radiography entails a 25% rate or more of negative exams. CT scan appears to be the most accurate non-invasive tool for ruling out the presence of a FB but its use cannot be systematic due to its complexity and the risks of exposure to radiation. Digital substraction fluoroscopy is a safe and simple mean to confirm the presence of air trapping generated by a bronchial obstruction, but it is not sensitive enough to definitively rule out a FB. We propose a stepwise approach using fluoroscopy or possibly flexible bronchoscopy under sedation, in order to reduce the number of negative RBs while restricting the use of the CT scan.

Pediatric Rigid Bronchoscopy for Foreign Body Removal

Pediatric Rigid Bronchoscopy for Foreign Body Removal

Pediatric Rigid Bronchoscopy for Foreign Body Removal

PhiliPPine Journal of otolaryngology-head and neck Surgery 39 Rigid bronchoscopy is a procedure that is performed in order to directly visualize the upper and lower airway and is carried out for either a diagnostic or therapeutic purpose. Suspected foreign body (FB) aspiration is the most common indication for performing this procedure in the pediatric age group at the Philippine Children’s Medical Center where a recent census (May 2008 to April 2009) showed that of 21 cases where rigid bronchoscopy was performed, 10 were for suspected FB aspiration. A review of 101 cases in the same institution showed that the average age of patients with FB aspiration was 2 years and the most common item aspirated was a peanut followed by the atis (sweetsop) seed and chicken bone chips. The most common inorganic foreign body was an earring and “whistle” (which broke off from a toy).1 It is more common in males probably because of their usually more active nature and is frequently found in the right mainstem bronchus where the FB more easily lodges being straighter, shorter and wider in diameter. FBs are life-threatening events in children that require early diagnosis and prompt successful management.2 A good history, physical examination and analysis of diagnostic tests are vital in every situation. In most cases, the child’s aspiration of the foreign object is a witnessed event 3 and this history of aspiration is the most sensitive diagnostic tool. The main symptoms include choking, prolonged cough and dyspnea. Abnormal physical examination findings are found in 67% to 80% of cases and include unilaterally decreased breath sounds, wheezing and stridor.2,4 Radiographic procedures may show abnormal findings in only about 68-86% of cases.4,5 The most useful radiographs requested are the chest posteroanterior (anteroposterior in infants and small children) and lateral views which may help localize the impaction site when the object aspirated is radiopaque.3 However, most inhaled FBs are radiolucent and their presence can be suspected by obtaining inspiration and expiration views to demonstrate unilateral hyperinflation. Other suggestive features include atelectasis, pneumothorax and pneumonia. These indirect radiologic features of FB inhalation are present in 76% of cases.2, Where inspiration and expiration views cannot be obtained, as in very young children, left and right decubitus views may be helpful. 6 Fluoroscopic studies may also be obtained along with the plain radiographs, however, specificity and sensitivity are not very high.4 Virtual bronchoscopy may also be used in patients with suspected FB aspiration. Virtual bronchoscopy which uses multislice computerized tomography (MDCT) with realistic 3-dimensional reconstruction may be helpful in detecting and localizing the FB prior Pediatric Rigid Bronchoscopy for Foreign Body Removal Maria Rina T. Reyes-Quintos, MD, MClinAud1,2

Virtual Bronchoscopy as a Dynamic Modality in the Diagnosis and Treatment of Suspected Foreign Body Aspiration

Rigid bronchoscopy (RB) is an invasive procedure and has its own risks. The place of virtual bronchoscopy (VB) in the treatment of patients with a clinical and radiological suspicion of foreign body aspiration was evaluated to see whether its usage can prevent rigid bronchoscopy. The study was performed between December 2005 and May 2007 in 60 patients (35 M and 25 F) aged between 4 months and 7 years with clinical and radiographical suspicion of foreign body aspiration. Patients with radio-opaque foreign body aspiration were excluded from the study and treated directly by RB. VB was performed using 16 detector multislice computerized tomography (MDCT). If VB or clinical follow-up supported the diagnosis of foreign body, RB was performed for diagnosis and treatment. The results of RB were compared with the results of VB. All patients underwent VB. In 40 patients there was a suspicion of foreign body with VB. Two patients improved without RB: one had spontaneous discharge of the foreign body with coughing, and one experienced spontaneous clinical improvement. The remaining 38 patients underwent RB and a foreign body was found in the reported localization in 33. No foreign body was found with RB in 5 patients showing foreign body in VB. But we found bronchial vegetations in 2, obstructing mucus plug in 2 and external bronchial compression by neuroenteric cyst in one. In 20 patients there was no suspicion of foreign body with VB. Of these, 7 patients with presenting symptoms for more than one month underwent RB, but no foreign body was found. The 13 remaining patients were followed up clinically with improvement of symptoms. MDCT devices still require further investigation when used in pediatric surgical pathologies. Reconstructed images of VB can reveal images close to the real anatomy. In patients with a suspicion of foreign body ingestion, initial VB may help to determine the presence and exact localization of the foreign body and if negative, may reduce the number of unnecessary rigid bronchoscopies. None of the patients with negative VB had foreign bodies. Positive VB may help to shorten the operative time by providing information about the localization and size of the foreign body.

Dynamic Visualization of Breath Sound Distribution in Suspected Foreign Body Aspiration

Foreign body aspiration is a common problem in toddlers and school-aged children. Bronchoscopy is required to make a definitive diagnosis of foreign body aspiration. We examined dynamic images of breath sound distribution in 6 children with suspected foreign body aspiration (4 boys, 2 girls; age range, 9 to 14 y) and 3 healthy controls (1 boy, 2 girls; age range, 11 to 13 y). Three of the children with suspected foreign body aspiration had an abnormal distribution of breath sounds between their right and left lungs in both the images and quantitative assessments; bronchoscopy confirmed the presence of a foreign body. Two plastic pen caps and an irregularly shaped plastic piece were removed from the obstructed bronchi. The other 3 children showed a normal distribution, and bronchoscopy was negative for the presence of a foreign body. Healthy controls also demonstrated normal (relatively symmetrical) distribution of breath sounds in both lungs. Visualization of breath sounds provides an objective qualitative and quantitative method that may identify abnormalities in breath sound distribution that occur in cases of foreign body aspiration. Further research is warranted to establish the sensitivity and specificity of this technique.

Utilization of low-dose multidetector CT and virtual bronchoscopy in children with suspected foreign body aspiration

Foreign body aspiration is common in children, especially those under 3 years of age. Chest radiography and CT are the main imaging modalities for the evaluation of these children. Management of children with suspected foreign body aspiration (SFBA) mainly depends on radiological findings. To investigate the potential use of low-dose multidetector CT (MDCT) and virtual bronchoscopy (VB) in the evaluation and management of SFBA in children. Included in the study were 37 children (17 girls, 20 boys; age 4 months to 10 years, mean 32 months) with SFBA. Chest radiographs were obtained prior to MDCT in all patients. MDCT was performed using a low-dose technique. VB images were obtained in the same session. Conventional bronchoscopy (CB) was performed within 24 h on patients in whom an obstructive abnormality had been found by MDCT and VB. Obstructive pathology was found in 16 (43.25%) of the 37 patients using MDCT and VB. In 13 of these patients, foreign bodies were detected and removed via CB. The foreign bodies were located in the right main bronchus (n = 5), in the bronchus intermedius (n = 6), in the medial segment of the middle lobe bronchus (n = 1), and in the left main bronchus (n = 1). In the remaining three patients, the diagnosis was false-positive for an obstructive pathology by MDCT and VB; the final diagnoses were secretions (n = 2) and schwannoma (n = 1), as demonstrated by CB. In 21 patients in whom no obstructive pathology was detected by MDCT and VB, CB was not performed. These patients were followed for 5-20 months without any recurrent obstructive symptomatology. Low-dose MDCT and VB are non-invasive radiological modalities that can be used easily in the investigation of SFBA in children. MDCT and VB provide the exact location of the obstructive pathology prior to CB. If obstructive pathology is depicted with MDCT and VB, CB should be performed either for confirmation of the diagnosis or for the diagnosis of an alternative cause for the obstruction. In cases where no obstructive pathology is detected by MDCT and VB, CB may not be clinically useful.

Tracheobronchial aspiration of foreign bodies: current indications for emergency plain chest radiography

The purpose of this study was to determine the role of plain chest radiography in the evaluation of patients with suspected foreign-body aspiration. During a 5-year period, 31 patients (18 men and 13 women; age range 6 months to 85 years) were referred to our observation for clinical suspicion of foreign-body aspiration. Clinically, the patients presented with cough in 27/31 cases (87.1%), decreased breath sounds in 22/31 (71%), choking in 18/31 (58.1%), fever in 7/31 (22.6%) and cyanosis in 5/31 (16.1%). Suspected foreign-body aspiration had occurred 2-72 h before hospitalisation. Within 2 h of hospitalisation, all patients underwent plain chest radiography performed in the upright position (two projections) in 10/31 (32.3%) patients and in the supine decubitus position in the remaining 21 (67.7%) patients. Plain chest radiography was subsequently integrated with multislice computed tomography (MSCT) of the chest in 3/31 (9.7%) patients and with bronchoscopy in 27/31 (87.1%) patients. Plain chest radiography showed the presence of a foreign body in the tracheobronchial tree in 7/31 (22.6%) patients, who subsequently underwent successful bronchoscopy in all cases. Foreign bodies included tooth fragment (three cases), nail (two cases), metallic spiral of a ball-point pen (one case) and an earring (one case). In the remaining 24/31 patients, plain chest radiography was positive in 14 cases, showing atelectasis (seven cases), pneumonia (six cases), pulmonary hyperinflation (one case) and pneumomediastinum (one case). Such findings had been caused by an aspirated foreign body, which was subsequently removed by means of bronchoscopy in all 14 patients. Moreover, three of the remaining ten patients with negative plain chest radiograph were submitted to MSCT of the chest, which required in 1 case tracheobronchial aspiration of a foreign body that was subsequently removed by means of bronchoscopy. Overall, plain chest radiography showed the presence of foreign-body aspiration and/or pleuroparenchymal lesions in 21/31 patients (67.7%); bronchoscopy was positive in 23/27 patients (85.2%), localising the foreign body in the right main bronchus in 16/27 patients (59.3%), left main bronchus in 7/27 patients (25.9%), intermediate bronchus in 2/27 patients (7.4%) and right lower lobe bronchus in 2/27 patients (7.4%). No late complications were observed within 6 months of hospital discharge. Plain chest radiography remains the initial imaging modality for patients with clinically suspected tracheobronchial aspiration of a foreign body. Nevertheless, in the case of negative chest radiography and a clinical suspicion of foreign-body aspiration, MSCT-possibly integrated with virtual bronchoscopy-should be considered in order to avoid unnecessary bronchoscopy.

Late Presentation of Tracheobronchial Foreign Body Aspiration in Children

The diagnosis of tracheobronchial foreign body (FB) aspiration in children is often delayed or overlooked. The aim of this study is to examine the causes of delay (>1 month) in the diagnosis and to study the complications of late presentation and their management. During the period between July 1993 and August 2002, 128 patients with suspected FB aspiration were admitted to KKUH, Riyadh, Saudi Arabia. Twenty-eight patients out of 128 patients presented late (>1 month). The medical records of those 28 patients were reviewed in respect to: history of FB aspiration, physical signs of symptoms, reason for delayed presentation, radiological investigation, complications and their management, and follow-up. There were 16 males and 12 females; the average age was 3.28 years (range 1--11 years). All of them experienced chronic cough at presentation. Thirteen (48 per cent) children had a history suggestive of FB aspiration. Seventeen (63 per cent) children presented with complications that included pneumonia (n=13), bronchiectasis (n=3), and bronchoesophageal fistula (n=1). The diagnostic delay was attributed to physician misdiagnosis (n=9), failure by parents to seek early medical advice (n=4), patients left against medical advice (n=1), and the cause of delay was unknown in the remaining 14 children. Rigid bronchoscopy was performed in all patients. FB was found in all cases except four. Complications were treated as follows: pneumonia with intravenous antibiotics, bronchiectasis conservatively and bronchoesophageal fistula repaired surgically. Follow-up ranged from 6 to 48 months. Diagnostic delay of tracheobronchial FB aspiration has significant morbidity in children. A high index of suspicion and early referral are essential in preventing such complications.

Suspected foreign body aspiration in a child with endobronchial tuberculosis

Endobronchial tuberculosis is a form of pulmonary tuberculosis, thought to result from rupture of an infected node through the bronchial wall or from lymphatic spread to the mucosal surface of the bronchial tree. With the presence of multidrug resistant isolates of TB, and its incidence in an increasing number of foreign-born persons immigrating to the US, otolaryngologists must be aware of its often subtle presentation. The following case is an unusual presentation of endobronchial tuberculosis initially diagnosed as an airway foreign body.

Indications for flexible versus rigid bronchoscopy in children with suspected foreign-body aspiration

Diagnostic indications for flexible bronchoscopy in the initial investigation of children with suspected foreign-body (FB) aspiration have not been evaluated prospectively. We prospectively collected history, clinical, and radiologic findings at prebronchoscopic examination of all children referred for suspected FB aspiration between February 1993 and September 1995. Children with asphyxiating FB aspiration, requiring immediate rigid bronchoscopy, were excluded. If there was clear evidence of FB aspiration from the physical and radiographic findings, rigid bronchoscopy was directly performed. If the evidence was not convincing, children underwent diagnostic flexible bronchoscopy under local anesthesia. If an FB was found, rigid bronchoscopy was always performed for extraction. Eighty-three consecutive children (median age: 24 mo) were included. Among 28 who underwent rigid bronchoscopy first, 23 had an FB. Among the 55 children who underwent flexible bronchoscopy first, 17 had an FB. Predictive signs of a bronchial FB were a radiopaque FB, and associated unilaterally decreased breath sounds and obstructive emphysema (positive predictive value = 0.94). We propose the following management algorithm: Rigid bronchoscopy is performed first in case of asphyxia, a radiopaque FB, or association of unilaterally decreased breath sounds and obstructive emphysema. In any other case, flexible bronchoscopy is performed first for diagnostic purposes. If applied retrospectively to the 83 children in our study, this algorithm would have decreased the negative first rigid bronchoscopy rate to 4%. Flexible bronchoscopy is a safe and cost-saving diagnostic procedure in children with suspected FB aspiration.

Indications for flexible versus rigid bronchoscopy in children with suspected foreign-body aspiration.

Diagnostic indications for flexible bronchoscopy in the initial investigation of children with suspected foreign-body (FB) aspiration have not been evaluated prospectively. We prospectively collected history, clinical, and radiologic findings at prebronchoscopic examination of all children referred for suspected FB aspiration between February 1993 and September 1995. Children with asphyxiating FB aspiration, requiring immediate rigid bronchoscopy, were excluded. If there was clear evidence of FB aspiration from the physical and radiographic findings, rigid bronchoscopy was directly performed. If the evidence was not convincing, children underwent diagnostic flexible bronchoscopy under local anesthesia. If an FB was found, rigid bronchoscopy was always performed for extraction. Eighty-three consecutive children (median age: 24 mo) were included. Among 28 who underwent rigid bronchoscopy first, 23 had an FB. Among the 55 children who underwent flexible bronchoscopy first, 17 had an FB. Predictive signs of a bronchial FB were a radiopaque FB, and associated unilaterally decreased breath sounds and obstructive emphysema (positive predictive value = 0.94). We propose the following management algorithm: Rigid bronchoscopy is performed first in case of asphyxia, a radiopaque FB, or association of unilaterally decreased breath sounds and obstructive emphysema. In any other case, flexible bronchoscopy is performed first for diagnostic purposes. If applied retrospectively to the 83 children in our study, this algorithm would have decreased the negative first rigid bronchoscopy rate to 4%. Flexible bronchoscopy is a safe and cost-saving diagnostic procedure in children with suspected FB aspiration.