Utilidad de la fibrobroncoscopia en el paciente crítico pediátrico

Retrospective evaluation of a paediatric intensivist-led flexible bronchoscopy service

OBJECTIVE

To demonstrate the diagnostic yield, therapeutic role and safety of flexible bronchoscopy via an intensivist-led service in critically ill children.

DESIGN

Retrospective chart review.

SETTING

Regional paediatric intensive care unit.

MEASUREMENTS AND RESULTS

One hundred forty-eight flexible bronchoscopies were performed by two intensivists on 134 patients (median age 16.5 months) over a 2.5-year period. Eighty-eight percent of patients required mechanical ventilation, and 22% were receiving inotropes. Case mix included general (n = 77), cardiac surgery (n = 18), cardiology (n = 13), ear-nose-and-throat surgery (n = 17), oncology (n = 8) and renal (n = 1). The indication for bronchoscopy was defined a priori according to one of four categories: suspected upper airway disease (n = 32); lower airway disease (n = 70); investigation of pulmonary disease (n = 25); and extubation failure (n = 21). Bronchoscopy was generally performed soon after PICU admission, at a median time of 1.5 days for the former three categories, and 4 days for extubation failure group. A positive yield from bronchoscopy (diagnosis that explained the clinical condition or influenced patient management) was present in 113 of 148 (76%) procedures, varying within groups from 44% (pulmonary disease) to 90% (extubation failure). Ten percent of patients developed a fall in oxygen saturations > 20% during the procedure and 17% required a bolus of at least 10 ml/kg of 0.9% saline for hypotension.

CONCLUSIONS

Critically ill patients with respiratory problems may benefit from a PICU-led bronchoscopy service as the yield for positive bronchoscopic finding is high, particularly for upper airway problems or extubation failure.

[Contribution of flexible bronchoscopy to the diagnosis of upper airway alterations]

INTRODUCTION

Flexible bronchoscopy (FB) is becoming an increasingly common diagnostic and therapeutic technique and is currently an essential procedure in pediatric pulmonology departments. Because the procedure is easy to perform under sedation and topical anesthesia, avoiding surgery with general anesthesia, which is required for rigid bronchoscopy, it has allowed the use of airway endoscopy in infants and children to be increased and has reduced patient risks.

OBJECTIVE

To analyze the contribution of FB to the diagnosis of upper airway alterations and to characterize the frequency and type of upper airway anomalies.

PATIENTS AND METHODS

We retrospectively reviewed the FB performed in our center between January 1993 and March 2003 in children aged less than 14 years old.

RESULTS

A total of 456 FB were performed in 378 children. One hundred eleven FB (24.5 % of all endoscopies) were required for suspected upper airway anomalies and 55.8 % corresponded to stridor. Upper airway inspection revealed abnormality in 30.7 % (140 FB). There were no severe complications.

CONCLUSION

FB is useful in the diagnosis of upper airway abnormalities. The main indication for FB is stridor and the most common abnormal finding of the upper airway is laryngomalacia.

Fibrobroncoscopia en el niño con ventilación mecánica

Fiberoptic bronchoscopy can be performed at the patient's bedside. This technique allows direct visualization of the upper and lower airways up to the segmental and subsegmental bronchi. Its most frequent indications are airway examination ot evaluate damage produced by toxins or the endotracheal tube, patency of the endotracheal tube and extubation failure. It is also used to obtain microbiological samples, facilitate intubation when difficult, aspirate airway sections or mucus plugs, perform bronchoalveolar lavage and administer drugs. With prior preparation, adequate monitoring and sedation, material according to the size of the patient and correct techniques, there are few complications. However, the procedure can produce trauma and obstruction of the airway, bronchial hemorrhage, barotrauma, loss of alveolar recruitment, bronchospasm, hypoxemia, bradycardia, and bronchopulmonary infection.

Aspiración endotraqueal, cepillado y lavado broncoalveolar

The aim of endotracheal aspiration is to eliminate secretions in patients with an artificial airway. All children with mechanical ventilation must undergo this procedure periodically. The frequency of aspiration depends on the type and quantity of the respiratory secretions and on the patient's clinical status. Aspiration should be performed by two people to maintain a greater degree of asepsis and to optimize stability of the airway and ventilation. Closed aspiration systems are available that allow aspiration without the need to disconnect the patient through a single probe that is constantly protected by a plastic sleeve and isolated from external environment. The most important risks of endotracheal aspiration are hypoxemia, mucosal injury, bronchospasm, arrhythmias, perforation of the airway with development of pneumothorax, accidental extubation, and infections. Bronchial brushing with a protected catheter and brochoalveolar lavage are used to analyze pulmonary infections. These techniques can be performed blind or through fibrobronchoscopy. They can also be used for the diagnosis of noninfectious pulmonary diseases such as alveolar proteinosis, alveolar hemorrhage or histiocytosis. Their adverse effects are similar to those of endotracheal aspiration.