Congenital vascular anomalies and persistent respiratory symptoms in children

Dexamethasone regime and clinical outcomes in children hospitalized with croup: A cohort study

BACKGROUND

High-quality trial evidence supports the use of one dose of dexamethasone in the outpatient management of croup; however, there are no inpatient trials, and the optimal treatment regimen for the inpatient management of croup remains uncertain. Significant practice variability exists in the corticosteroid treatment of children hospitalized for croup.

OBJECTIVE

To evaluate the association of dexamethasone treatment regimen (1 vs. >1 dose) with hospital length of stay (LOS) and 30-day return to emergency department (ED) visits among children hospitalized for croup.

METHODS

A cohort study of children hospitalized for croup at a children's hospital between 2010 and 2022. Children less than 10 years old, without known airway anomalies and who received dexamethasone for croup treatment were included. Children who received 1 dose versus >1 dose of dexamethasone were compared. Propensity score analyses, using inverse probability of treatment weighting, were conducted to estimate the treatment effects of dexamethasone regimen on hospital LOS and all-cause 30-day return to ED visit.

RESULTS

Of 471 children hospitalized for croup, 229 (49%) received 1 dose of dexamethasone; 242 (51%) received >1 dose. In the propensity-weighted analyses, children receiving >1 dose of dexamethasone had a longer mean LOS by 59.6 h (95% CI 44.8-74.5, p < .001) compared with those receiving >1 dose. There was no statistically significant difference in the odds of all-cause 30-day return to ED visit; OR 1.30, (95% CI 0.76-2.22, p = .33).

CONCLUSIONS

Among children hospitalized for croup, children who received >1 dose of dexamethasone had a longer LOS compared with children who received 1 dose of dexamethasone; however, there was no statistically significant difference in the 30-day return to ED visits. Randomized clinical trials are needed to determine the optimal dexamethasone treatment regimen for children hospitalized with croup.

Chronic respiratory disorders due to aberrant innominate artery: a case series and critical review of the literature

BACKGROUND

Tracheal compression (TC) due to vascular anomalies is an uncommon, but potentially serious cause of chronic respiratory disease in childhood. Vascular slings are congenital malformations resulting from abnormal development of the great vessels; in this group of disorders the most prevalent entity is the aberrant innominate artery (AIA). Here we provide a report on diagnosis and treatment of AIA in nine children with unexplained chronic respiratory symptoms. We describe the cases, perform a literature review, and provide a discussion on the diagnostic workup and treatment that can help manage AIA.

METHODS

Clinical history, diagnostic procedures and treatment before and after the AIA diagnosis were retrospectively reviewed in nine children (5 boys and 4 girls), who were referred for recurrent-to-chronic respiratory manifestations over 10 years (2012-2022). We performed a comprehensive report on the ongoing clinical course and treatment as well as an electronic literature search on the topic.

RESULTS

Diagnoses at referral, before AIA was identified, were chronic dry barking cough associated with recurrent pneumonia (n = 8, 89%), lobar/segmental atelectasis (n = 3, 33%), atopic/non atopic asthma (n = 3, 33%); pneumomediastinum with subcutaneous emphysema complicated the clinical course in one case. When referred to our Unit, all patients had been previously treated with repeated antibiotic courses (n = 9, 100%), alone (n = 6, 67%) or combined with prolonged antiasthma medications (n = 3, 33%) and/or daily chest physiotherapy (n = 2, 22%), but reported only partial clinical benefit. Median ages at symptom onset and at AIA diagnosis were 1.5 [0.08-13] and 6 [4-14] years, respectively, with a relevant delay in the definitive diagnosis (4.5 years). Tracheal stenosis at computed tomography (CT) was ≥ 51% in 4/9 cases and ≤ 50% in the remaining 5 subjects. Airway endoscopy was performed in 4 cases with CT evidence of tracheal stenosis ≥ 51% and confirmed CT findings. In these 4 cases, the decision of surgery was made based on endoscopy and CT findings combined with persistence of clinical symptoms despite medical treatment. The remaining 5 children were managed conservatively.

CONCLUSIONS

TC caused by AIA may be responsible for unexplained chronic respiratory disease in childhood. Early diagnosis of AIA can decrease the use of expensive investigations or unsuccessful treatments, reduce disease morbidity, and accelerate the path toward a proper treatment.

Intranasal fentanyl for respiratory distress in children and adolescents with life-limiting conditions

Background

Respiratory distress is one of the most common and frightening symptoms of children with life-limiting conditions. Because treatment of the underlying cause is frequently impossible or insufficient, in many children, symptomatic treatment is warranted. The purpose of this study was to describe the circumstances of the use of intranasal fentanyl in an acute attack of respiratory distress (AARD) in children receiving palliative care, as well as to describe outcomes and adverse events after its use.

Methods

Children and adolescents treated in a pediatric palliative unit or attended by a specialized home care team between 2010 and 2016 were included in this study. A retrospective chart review was conducted of those who were treated with intranasal fentanyl for an AARD.

Results

During the study period 16 children (0.5–18.6 years) with various life-limiting conditions were treated with intranasal fentanyl for AARD. In total, 70 AARDs were analyzed. In 74% of all AARDs, a single dose of intranasal fentanyl was used. Frequent causes for an AARD were excessive secretions and acute respiratory infection. The median starting dose of intranasal fentanyl was 1.5 μg/kg body weight. Labored breathing (96%), tachypnea (79%) and related suffering (97%) improved after treatment. An adverse event occurred in one child.

Conclusions

Intranasal fentanyl may be a safe and effective medication for the treatment of acute attacks of respiratory distress in children with life-limiting conditions. However, prospective studies with larger sample sizes and a control group are needed to validate these findings.

[A case of malformation of aortic arches simulating asthma]

INTRODUCTION

Abnomalies of the aortic arches are rare and account for 1% of congenital cardiovascular malformations. They constitute one of the causes of compression of the airways with attacks of dyspnea sometimes simulating an asthma. We report the case of an infant with an anomaly development of aortic arches with impact breathing.

CASE REPORT

It was a 22-month-old infant who consulted for a dyspnea with a type of stridor associated with a fat cough. This clinical table started 45 days after its birth and led to many hospitalizations in the pediatric emergency. Clinical exam found polypnea, with a wheezing, bronchial groan and diffuse sibilants on the auscultation. The chest X-ray revealed a slightly retractile right lung. The angioscanner of the thoracic and abdominal aorta showed a double aortic arch with retro-oesophageal left ventricular artery. A thoracotomy was performed and the operative sequences were simple.

CONCLUSION

The congenital anomalies of the aortic arch are rare and varied, sometimes asymptomatic. This case reminds us that, in front of any recurrent or digestive respiratory signs in the infant, malformation of the aortic arches should be considered.

Mild tracheal compression by aberrant innominate artery and chronic dry cough in children

BACKGROUND

In children with aberrant innominate artery (AIA) one of the most prevalent respiratory symptom is dry cough. How frequently this mediastinal vessels anomaly, that can induce tracheal compression (TC) of different degree, may be detected in children with chronic dry cough is not known.

METHODS

In a 3-year retrospective study, the occurrence of mediastinal vessels abnormalities and the presence and degree of TC was evaluated in children with recurrent/chronic dry cough.

RESULTS

Vascular anomalies were detected in 68 out of the 209 children evaluated. A significant TC was detected in 54 children with AIA, in eight with right aortic arch, in four with double aortic arch but not in two with aberrant right subclavian artery. In AIA patients, TC evaluated on computed tomography scans, was mild in 47, moderate in six and severe in one. During bronchoscopy TC increased in expiration or during cough, but this finding was more pronounced in children with right aortic arch and double aortic arch in which a concomitant tracheomalacia was more evident. Comorbidities were detected in 21 AIA patients, including atopy, reversible bronchial obstruction and gastroesophageal reflux. Aortopexy was performed in eight AIA patients, while the remaining AIA patients were managed medically and showed progressive improvement with time.

CONCLUSION

Mild TC induced by AIA can be detected in a sizeable proportion of children with recurrent/chronic dry cough. The identification of this anomaly, that may at least partially explain the origin of their symptom, may avoid further unnecessary diagnostic examinations and ineffective chronic treatments.

Endotracheal tube as tracheal stent in vascular ring

Management of vascular ring is always a matter of great concern. There is limited literature on management of carbon dioxide retention in mechanically ventilated patients with vascular rings due to double aortic arch, while awaiting corrective cardiac surgery. A 29-day-old girl with complete duplicated double aortic arch, left descending aorta, and a left patent ductus arteriosus, had severe upper respiratory tract obstruction with carbon dioxide retention. She was managed successfully by endotracheal tube manipulation.

Fifteen-minute consultation: structured approach to management of a child with recurrent croup

Recurrent croup is a distinct clinical entity from viral croup. It is not a specific diagnosis and its presence should alert the clinician to explore the underlying cause. We discuss an evidence-based structured approach to management of a child with recurrent croup.

Resolution of opisthotonus in respiratory distress by aortopexy

We report a case of worsening respiratory distress associated with opisthotonus secondary to tracheomalacia, a rather unique pathophysiological phenomenon. A 2-month-old male baby was referred to our hospital for respiratory distress syndrome with a noticeable opisthotonus. Examination and investigation confirmed the presence of an aberrant innominate artery compressing the trachea. The infant underwent aortopexy and made a dramatic post-operative recovery. Of special note, the opisthotonus vanished soon after the operation. Opisthotonus is not always related to neurological impairment and may be a warning sign of mediastinal overcrowding in patients with respiratory distress syndrome secondary to vascular compression.

Interventions for primary (intrinsic) tracheomalacia in children

BACKGROUND

Tracheomalacia, a disorder of the large airways where the trachea is deformed or malformed during respiration, is commonly seen in tertiary paediatric practice. It is associated with a wide spectrum of respiratory symptoms from life-threatening recurrent apnoea to common respiratory symptoms such as chronic cough and wheeze. Current practice following diagnosis of tracheomalacia includes medical approaches aimed at reducing associated symptoms of tracheomalacia, ventilation modalities of continuous positive airway pressure (CPAP) and bi-level positive airway pressure (BiPAP), and surgical approaches aimed at improving the calibre of the airway (airway stenting, aortopexy, tracheopexy).

OBJECTIVES

To evaluate the efficacy of medical and surgical therapies for children with intrinsic (primary) tracheomalacia.

SEARCH METHODS

The Cochrane Airways Group searched the Cochrane Central Register of Controlled Trials (CENTRAL), the Cochrane Airways Group's Specialised Register, MEDLINE and EMBASE databases. The Cochrane Airways Group performed the latest searches in March 2012.

SELECTION CRITERIA

All randomised controlled trials (RCTs) of therapies related to symptoms associated with primary or intrinsic tracheomalacia.

DATA COLLECTION AND ANALYSIS

Two reviewers extracted data from the included study independently and resolved disagreements by consensus.

MAIN RESULTS

We included one RCT that compared nebulised recombinant human deoxyribonuclease (rhDNase) with placebo in 40 children with airway malacia and a respiratory tract infection. We assessed it to be a RCT with overall low risk of bias. Data analysed in this review showed that there was no significant difference between groups for the primary outcome of proportion cough-free at two weeks (odds ratio (OR) 1.38; 95% confidence interval (CI) 0.37 to 5.14). However, the mean change in night time cough diary scores significantly favoured the placebo group (mean difference (MD) 1.00; 95% CI 0.17 to 1.83, P = 0.02). The mean change in daytime cough diary scores from baseline was also better in the placebo group compared to those on nebulised rhDNase, but the difference between groups was not statistically significant (MD 0.70; 95% CI -0.19 to 1.59). Other outcomes (dyspnoea, and difficulty in expectorating sputum scores, and lung function tests at two weeks also favoured placebo over nebulised rhDNase but did not reach levels of significance.

AUTHORS' CONCLUSIONS

There is currently an absence of evidence to support any of the therapies currently utilised for management of intrinsic tracheomalacia. It remains inconclusive whether the use of nebulised rhDNase in children with airway malacia and a respiratory tract infection worsens recovery. It is unlikely that any RCT on surgically based management will ever be available for children with severe life-threatening illness associated with tracheomalacia. For those with less severe disease, RCTs on interventions such as antibiotics and chest physiotherapy are clearly needed. Outcomes of these RCTs should include measurements of the trachea and physiological outcomes in addition to clinical outcomes.

Therapy for cough: where does it fall short?

Studies on cough have come a long way but many shortfalls still exist. These shortfalls can be attributed to: the lack of randomized controlled studies with a focus on cough; studies not using robust cough outcome measures, poor definition of target groups in studies and guidelines, the lack of safe and efficacious treatments; difficulty in defining etiological factors, and the lack of data on the predictors of response to therapies for cough dominant etiologies. Addressing shortfalls in cough therapy that focuses on improving the lives of people with cough requires a systematic approach that includes better medications, high quality studies, improved multidisciplinary guidelines and education (of both health professionals and patients). To achieve new cough therapeutics requires an improved understanding of cough in humans (i.e., not just in animals). Development of new medications without substantial adverse events is long awaited for cough.

The approach to pediatric cough

OBJECTIVE

To provide an overview of pediatric cough, with specific emphasis on various causes, to aid in diagnosis and treatment.

DATA SOURCES

Relevant articles and references published between January 1, 1961, and May 1, 2009, were found through a PubMed search using the following keywords: pediatric cough and cough in children.

STUDY SELECTION

All key relevant articles and textbook sections were reviewed, and the most relevant were selected for inclusion in this review.

RESULTS

Although asthma, gastroesophageal reflux disease, and postnasal drip can be causes of cough in children, it is important to think of other potential causes, such as bronchitis, postviral cough, and foreign-body inhalation. Testing and treatment for cough will vary, depending on the presentation and diagnosis. Just as in adults, in children, the cause of cough can be multifactorial.

CONCLUSIONS

Pediatric cough is commonly encountered by primary care physicians and allergists. Physicians should be aware of the various potential causes of cough in children to properly determine the cause so that testing and treatment can proceed appropriately.

Tracheal compression by aberrant innominate artery: clinical presentations in infants and children, indications for surgical correction by aortopexy, and short- and long-term outcome

BACKGROUND

Aberrant innominate artery (AIA) may cause various degrees of tracheal compression (TC).

PURPOSE

The aim of this study is to define the clinical manifestations of AIA-induced TC and outcome after aortopexy in infants and older children.

METHODS

Children with significant AIA-induced TC were evaluated, and information after surgery or conservative management was obtained by telephonic interview after 1 to 4 years since discharge.

RESULTS

Overall, 15 infants (mean age, 8 months; group A) and 13 older children (mean age, 56 months; group B) were evaluated. Although median age at onset of symptoms was comparable in the 2 groups, mean delay to diagnosis was higher in group B (P < .0001). Analysis of the most prevalent symptoms showed that reflex apneas were more frequent in group A (P = .02), whereas chronic "intractable" cough was more frequent in group B (P < .001). Because of the type and severity of symptoms and the degree of TC, 16 patients underwent aortopexy. Follow-up evaluation showed, in all but 1 patient, a significant improvement in symptoms and quality of life, measured by a modified Visick score.

CONCLUSIONS

Aberrant innominate artery-TC leads to a variety of respiratory disorders, with a difference in prevalence between infants and older children. When choice of treatment is based on clinical presentation and degree of TC, a good clinical outcome may be obtained also in children in whom aortopexy is indicated, that is, those presenting initially with more severe symptoms.

Flexible bronchoscopy as a valuable tool in the evaluation of persistent wheezing in children

BACKGROUND

Persistent wheezing is a common problem in early childhood and leads to a diagnostic dilemma, excessive investigations, drug administration and additional cost.

OBJECTIVE

To determine the efficacy and the safety of FOB in children with persistent wheezing despite bronchodilator and inhaled steroid therapy.

METHODS

Patients with persistent wheezing that lasted at least 6 weeks and did not respond to bronchodilator and inhaled steroid therapy and to whom flexible bronchoscopy was performed were included to the study.

RESULTS

Between 1997 and 2009; 113 patients were enrolled to the study. Sixty-three percent of the children were male. Median age was 14 months at presentation and median duration of symptoms was 5 months. Bronchoscopy revealed pathological findings in 48% of the patients. Thirty-eight patients had malacia disorders, 14 had foreign body aspiration and two had external compression of airways which were later diagnosed as vascular ring. Major and minor complications were not seen in 92% of the patients while transient hypoxia was seen in 6%, stridor in 1% and tachycardia in 1% of the patients.

CONCLUSION

Flexible bronchoscopy provided rapid and definitive diagnosis for our patients with persistent wheezing without any major complications. This study is one of the largest studies concerning persistent wheezing. Early bronchoscopic evaluation can reduce cost by providing rapid and accurate diagnosis and preventing unnecessary investigations and drug administration. Flexible bronchoscopy is a safe procedure and should be considered in the evaluation of children with persistent wheezing.

Cough throughout life: children, adults and the senile

We review cough from premature birth, mature neonatal life, in childhood and adult life, and in old age. There is a regrettable lack of definitive studies, but many clues in the literature. The cough reflex seems weak in premature infants, but develops with maturity. It is pronounced in childhood, but there seem to be no studies comparing its strength then with that in adulthood. In old age the cough may weaken, as indicated by the prevalence of aspiration pneumonia. These changes are presumably related to the development and degeneration of the afferent and central nervous pathways for cough, which may be reflected in the changes in laryngeal muscle function with age. There is much evidence that age influences the development of the respiratory system in general, and of the immune system which would affect the degree, frequency and clinical issues of cough. Other factors that limit our understanding of the changes in cough with age include the reporting of cough by parents in infants and carers in old age and the use of different diagnostic criteria throughout life. Age-related variation in cough sensitivity seems to be well established, but its quantitation and mechanisms require much further research.

Evaluation and outcome of young children with chronic cough

OBJECTIVE

To evaluate the use of an adult-based algorithmic approach to chronic cough in a cohort of children with a history of > 3 weeks of cough and to describe the etiology of chronic cough in this cohort.

METHODS

A prospective cohort study of children referred to a tertiary hospital with a history of > 3 weeks of cough between June 2002 and June 2004. All included children followed a pathway of investigation (including flexible bronchoscopy and evaluation of airway cytology via BAL) until diagnosis was made and/or their cough resolved.

RESULTS

In our cohort of 108 young children (median age 2.6 years), the majority had wet cough (n = 96; 89%), and BAL fluid samples obtained during bronchoscopy led to a diagnosis in 45.4% (n = 49). The most common final diagnosis was protracted bacterial bronchitis (n = 43; 39.8%). These patients had neutrophil levels on BAL samples that were significantly higher than those in other diagnostic groups (p < 0.0001). Asthma, gastroesophageal reflux disease (GERD), and upper airway cough syndrome (UACS), which are common causes of chronic cough in adults, were found in < 10% of the cohort (n = 10).

CONCLUSIONS

The adult-based anatomic pathway, which involves the investigation and treatment of patients with asthma, GERD, and UACS first is largely unsuitable for use in the management of chronic cough in young children as the common etiologies of chronic cough in children are different from those in adults.

Guidelines for evaluating chronic cough in pediatrics: ACCP evidence-based clinical practice guidelines

OBJECTIVES

To review relevant literature and present evidence-based guidelines to assist general and specialist medical practitioners in the evaluation and management of children who present with chronic cough.

METHODOLOGY

The Cochrane, MEDLINE, and EMBASE databases, review articles, and reference lists of relevant articles were searched and reviewed by a single author. The date of the last comprehensive search was December 5, 2003, and that of the Cochrane database was November 7, 2004. The authors' own databases and expertise identified additional articles.

RESULTS/CONCLUSIONS

Pediatric chronic cough (ie, cough in children aged <15 years) is defined as a daily cough lasting for >4 weeks. This time frame was chosen based on the natural history of URTIs in children and differs from the definition of chronic cough in adults. In this guideline, only chronic cough will be discussed. Chronic cough is subdivided into specific cough (ie, cough associated with other symptoms and signs suggestive of an associated or underlying problem) and nonspecific cough (ie, dry cough in the absence of an identifiable respiratory disease of known etiology). The majority of this section focuses on nonspecific cough, as specific cough encompasses the entire spectrum of pediatric pulmonology. A review of the literature revealed few randomized controlled trials for treatment of nonspecific cough. Management guidelines are summarized in two pathways. Recommendations are derived from a systematic review of the literature and were integrated with expert opinion. They are a general guideline only, do not substitute for sound clinical judgment, and are not intended to be used as a protocol for the management of all children with a coughing illness. Children (aged <15 years) with cough should be managed according to child-specific guidelines, which differ from those for adults as the etiologic factors and treatments for children are sometimes different from those for adults. Cough in children should be treated based on etiology, and there is no evidence for using medications for the symptomatic relief of cough. If medications are used, it is imperative that the children are followed up and therapy with the medications stopped if there is no effect on the cough within an expected time frame. An evaluation of the time to response is important. Irrespective of diagnosis, environmental influences and parental expectations should be discussed and managed accordingly. Cough often impacts the quality of life of both children and parents, and the exploration of parental expectations and fears is often valuable in the management of cough in children.

Interventions for primary (intrinsic) tracheomalacia in children

BACKGROUND

Tracheomalacia, a disorder of the large airways where the trachea is deformed or malformed during respiration is commonly seen in tertiary paediatric practice. It is associated with a wide spectrum of respiratory symptoms from life threatening recurrent apnea to common respiratory symptoms such as chronic cough and wheeze. Current practice following diagnosis of tracheomalacia include medical approaches aimed at reducing associated symptoms of tracheomalacia, ventilation modalities of continuous positive airway pressure (CPAP) and bi-level positive airway pressure (BiPAP) and, surgical approaches aimed at improving the caliber of the airway (airway stenting, aortopexy, tracheopexy).

OBJECTIVES

To evaluate the efficacy of medical and surgical therapies for children with intrinsic (primary) tracheomalacia.

SEARCH STRATEGY

The Cochrane Central Register of Controlled Trials (CENTRAL), the Cochrane Airways Group Specialised Register, MEDLINE and EMBASE databases were searched by the Cochrane Airways Group. The latest searches were performed in Feb 2005.

SELECTION CRITERIA

All randomised controlled trials of therapies related to symptoms associated with primary or intrinsic tracheomalacia.

DATA COLLECTION AND ANALYSIS

Results of searches were reviewed against pre-determined criteria for inclusion. No eligible trials were identified and thus no data were available for analysis.

MAIN RESULTS

No randomised controlled trials (RCTs) that examined therapies for intrinsic tracheomalacia were found. Eight of the more recent (last 11 years) non randomised controlled trials reported a benefit from the various surgical interventions. The success was however not universal and in some studies severe adverse events occurred.

AUTHORS' CONCLUSIONS

There is currently an absence of evidence to support any of the therapies currently utilised for management of intrinsic tracheomalacia. It is unlikely that any RCT on surgically based management will ever be available for children with severe life threatening illness associated with tracheomalacia. For those with less severe disease, RCTs are clearly needed. Outcomes of these RCTs should include measurements of the trachea and physiological outcomes in addition to clinical outcomes.

Cough: are children really different to adults?

Worldwide paediatricians advocate that children should be managed differently from adults. In this article, similarities and differences between children and adults related to cough are presented. Physiologically, the cough pathway is closely linked to the control of breathing (the central respiratory pattern generator). As respiratory control and associated reflexes undergo a maturation process, it is expected that the cough would likewise undergo developmental stages as well. Clinically, the 'big three' causes of chronic cough in adults (asthma, post-nasal drip and gastroesophageal reflux) are far less common causes of chronic cough in children. This has been repeatedly shown by different groups in both clinical and epidemiological studies. Therapeutically, some medications used empirically for cough in adults have little role in paediatrics. For example, anti-histamines (in particular H1 antagonists) recommended as a front-line empirical treatment of chronic cough in adults have no effect in paediatric cough. Instead it is associated with adverse reactions and toxicity. Similarly, codeine and its derivatives used widely for cough in adults are not efficacious in children and are contraindicated in young children. Corticosteroids, the other front-line empirical therapy recommended for adults, are also minimally (if at all) efficacious for treating non-specific cough in children. In summary, current data support that management guidelines for paediatric cough should be different to those in adults as the aetiological factors and treatment in children significantly differ to those in adults.

Sixteen-row multislice computed tomography in infants with double aortic arch

BACKGROUND

The introduction of multislice computed tomography (MSCT) in 1998 has led to a considerable boost of CT angiography. Four-row MSCT has been employed in the diagnostic assessment of vascular rings. Sixteen-row MSCT is expected to further increase the diagnostic power of MSCT. We report three cases of double aortic arch diagnosed by a 16-row MSCT, and discuss the possible advantages of this diagnostic tool.

PATIENTS AND METHODS

From April 1, 2003, to September 1, 2003, three patients underwent 16-row MSCT at our institution to evaluate the possible presence of a vascular ring. All patients presented with stridor and feeding difficulties. MSCT was performed under bland sedation (chloral hydrate 60 mg/kg). ECG gating and breath hold were not employed. Three-dimensional reconstructions were employed to assess the presence of airway compromise as well as of vascular anomalies.

RESULTS

Scanning time averaged 4 s (3.8-4.5 s). Motion artefacts were not relevant. The CT scan showed the existence of a vascular anomaly as well as of a significant tracheal compression in all cases, and was considered conclusively diagnostic by the cardiac surgeons. All three patients underwent uncomplicated corrective surgery without further investigations.

CONCLUSION

Sixteen-row MSCT with 3D reconstruction allows a precise evaluation of the airway compromise and a detailed assessment of the anatomy of vascular anomalies. The very short scanning time allows to avoid deep sedation and anaesthesia, and to obtain higher image quality and spatial resolution, with a concomitant reduction of the radiation dose.

Quantification of the magnification and distortion effects of a pediatric flexible video-bronchoscope

BACKGROUND

Flexible video bronchoscopes, in particular the Olympus BF Type 3C160, are commonly used in pediatric respiratory medicine. There is no data on the magnification and distortion effects of these bronchoscopes yet important clinical decisions are made from the images. The aim of this study was to systematically describe the magnification and distortion of flexible bronchoscope images taken at various distances from the object.

METHODS

Using images of known objects and processing these by digital video and computer programs both magnification and distortion scales were derived.

RESULTS

Magnification changes as a linear function between 100 mm (x1) and 10 mm (x9.55) and then as an exponential function between 10 mm and 3 mm (x40) from the object. Magnification depends on the axis of orientation of the object to the optic axis or geometrical axis of the bronchoscope. Magnification also varies across the field of view with the central magnification being 39% greater than at the periphery of the field of view at 15 mm from the object. However, in the paediatric situation the diameter of the orifices is usually less than 10 mm and thus this limits the exposure to these peripheral limits of magnification reduction. Intraclass correlations for measurements and repeatability studies between instruments are very high, r = 0.96. Distortion occurs as both barrel and geometric types but both types are heterogeneous across the field of view. Distortion of geometric type ranges up to 30% at 3 mm from the object but may be as low as 5% depending on the position of the object in relation to the optic axis.

CONCLUSION

We conclude that the optimal working distance range is between 40 and 10 mm from the object. However the clinician should be cognisant of both variations in magnification and distortion in clinical judgements.

Pierre Robin sequence and double aortic arch: a case report

We present an 8-day-old female with two admissions for respiratory failure. On the first admission, the diagnosis of Pierre Robin sequence (PRS) and laryngomalacia was made after assessment with chest radiography, echocardiography, and flexible fiberoptic laryngoscopy. Four days after discharge, the child presented with stridor and respiratory distress, and a new cardiac murmur was noted after admission. Repeat echocardiography, with confirmatory direct laryngobronchoscopy, revealed a double aortic arch (DAA) with distal tracheal compression. This case illustrates the necessity of a complete otolaryngic evaluation, including direct laryngobronchoscopy, to search for a synchronous airway lesion in any neonate with severe respiratory distress associated with stridor.

A right-sided aortic arch misdiagnosed as asthma since childhood

Congenital malformation of the aortic arch complex occurs in 3% of humans. These vascular aberrations result from embryonic structures that persist when there is incomplete atrophy or regression during normal development. Typically, anomalies of the aortic arch do not cause respiratory symptoms. However, in some individuals, the unusual position of the remnant vessels may compress the airway and cause airflow limitation. As might be expected, a symptomatic vascular anomaly is most often clinically apparent in childhood. We report an adult male with exertional dyspnea who had been diagnosed with asthma since childhood. After his symptoms proved refractory to newer asthmatic therapy, he was referred for further evaluation. Bronchial hyperactivity was not present with objective testing, and compression of his trachea by a right-sided aortic arch was confirmed with appropriate imaging studies. This report illustrates the need to confirm the diagnosis of asthma with objective measures of airflow and reminds the clinician that a congenital vascular aberrancy may initially elude diagnosis.

Persistent cough in children and the overuse of medications

OBJECTIVE

Children referred for persistent cough were evaluated for the referring and final diagnosis, and the extent of the use of medications prior to referral and the side effects encountered.

METHODS

Data on children seen by respiratory paediatricians for persistent cough (> or =4 weeks) in a tertiary respiratory setting were collected prospectively over 12 months.

RESULTS

Of the 49 children, 61.2% were diagnosed with asthma at referral, with similar referral rates from general practitioners and paediatricians. Children with isolated cough were just as likely to have been diagnosed with asthma as children with cough and wheeze. Medication use (asthma, gastro-oesophageal reflux and antibiotics) prior to referral was high, asthma medications were most common, and of these 12.9% had significant steroid side effects. The most common abnormality found (46.9%) was a bronchoscopically defined airway lesion, and in 56.5% of these children, another diagnosis (aspiration, achalasia, gastro-oesophageal reflux) existed. No children had a sole final diagnosis of asthma and pre-referral medications were weaned in all children.

CONCLUSION

Over diagnosis of asthma and the overuse of asthma treatments with significant side effects is common in children with persistent cough referred to a tertiary respiratory clinic. Children with persistent cough deserve careful evaluation to minimize the use of unnecessary medications and, if medications are used, assessment of response to treatment is important.

Bronchoscopic findings in children with non-cystic fibrosis chronic suppurative lung disease

BACKGROUND

Published data on the frequency and types of flexible bronchoscopic airway appearances in children with non-cystic fibrosis bronchiectasis and chronic suppurative lung disease are unavailable. The aims of this study were to describe airway appearances and frequency of airway abnormalities and to relate these airway abnormalities to chest high resolution computed tomography (cHRCT) findings in a cohort of children with non-cystic fibrosis chronic suppurative lung disease (CSLD).

METHODS

Indigenous children with non-cystic fibrosis CSLD (>4 months moist and/or productive cough) were prospectively identified and collected over a 2.5 year period at two paediatric centres. Their medical charts and bronchoscopic notes were retrospectively reviewed.

RESULTS

In all but one child the aetiology of the bronchiectasis was presumed to be following a respiratory infection. Thirty three of the 65 children with CSLD underwent bronchoscopy and five major types of airway findings were identified (mucosal abnormality/inflammation only, bronchomalacia, obliterative-like lesion, malacia/obliterative-like combination, and no macroscopic abnormality). The obliterative-like lesion, previously undescribed, was present in 16.7% of bronchiectatic lobes. Structural airway lesions (bronchomalacia and/or obliterative-like lesion) were present in 39.7% of children. These lesions, when present, corresponded to the site of abnormality on the cHRCT scan.

CONCLUSIONS

Structural airway abnormality is commonly found in children with post-infectious bronchiectasis and a new bronchoscopic finding has been described. Airway abnormalities, when present, related to the same lobe abnormality on the cHRCT scan. How these airway abnormalities relate to aetiology, management strategy, and prognosis is unknown.

Thoracoscopic aortopericardiosternopexy for severe tracheomalacia in toddlers

BACKGROUND/PURPOSE

Aortosternopexy from a left anterolateral thoracotomy is the procedure of choice in severe tracheomalacia. The authors report an alternative technique of modified thoracoscopic aortopericardiosternopexy.

METHODS

Thoracoscopy under mild CO2 insufflation (insufflation pressures 4 to 6 mm Hg) provides excellent access without selective intubation. The importance of visualizing the phrenic nerve, mobilization of the thymus without disrupting its vascular supply, and intraoperative bronchoscopy is stressed. The technique of passing the needle through the sternum and back is shown. In long segment tracheomalacia, not only the ascending aorta, but also the innominate artery and base of the pericardium are fixed to the sternum, and the effect is monitored by intraoperative bronchoscopy.

RESULTS

This technique was dramatically successful in a 4-year-old boy with long segment tracheomalacia and as a redo procedure in a 2-year-old girl after failed open aortopexy.

CONCLUSION

Thoracoscopic aortopexy seems to be as effective as open aortopexy.

Series of laryngomalacia, tracheomalacia, and bronchomalacia disorders and their associations with other conditions in children

Laryngomalacia, bronchomalacia, and tracheomalacia are commonly seen in pediatric respiratory medicine, yet their patterns and associations with other conditions are not well-understood. We prospectively video-recorded bronchoscopic data and clinical information from referred patients over a 10-year period and defined aspects of interrelationships and associations. Two hundred and ninety-nine cases of malacia disorders (34%) were observed in 885 bronchoscopic procedures. Cough, wheeze, stridor, and radiological changes were the most common symptoms and signs. The lesions were most often found in males (2:1) and on the left side (1.6:1). Concomitant malacia lesions ranged from 24% for laryngotracheobronchomalacia to 47% for tracheobronchomalacia. The lesions were found in association with other disorders such as congenital heart disorders (13.7%), tracheo-esophageal fistula (9.6%), and various syndromes (8%). Even though the understanding of these disorders is in its infancy, pediatricians should maintain a level of awareness for malacia lesions and consider the possibility of multiple lesions being present, even when one symptom predominates or occurs alone.