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Review ArticleReviews

Obstructive Fibrinous Tracheal Pseudomembrane After Endotracheal Intubation

Inderpaul Singh Sehgal, Sahajal Dhooria, Amanjit Bal, Ashutosh N Aggarwal, Digambar Behera and Ritesh Agarwal
Respiratory Care September 2016, 61 (9) 1260-1266; DOI: https://doi.org/10.4187/respcare.04662
Inderpaul Singh Sehgal
Department of Pulmonary Medicine
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Sahajal Dhooria
Department of Pulmonary Medicine
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Amanjit Bal
Department of Histopathology, Postgraduate Institute of Medical Education and Research, Chandigarh, India.
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Ashutosh N Aggarwal
Department of Pulmonary Medicine
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Digambar Behera
Department of Pulmonary Medicine
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Ritesh Agarwal
Department of Pulmonary Medicine
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  • For correspondence: [email protected]
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Abstract

Obstructive fibrinous tracheal pseudomembrane (OFTP) is an uncommon complication that results after tracheal intubation. Herein, we perform a systematic review of the PubMed and EmBase databases for all the cases describing OFTP. The systematic search yielded 28 citations describing 53 subjects with OFTP. The study population (61.1% females) comprised of both adults and pediatric subjects with a median (IQR) age of 40.5 (14.8–60.5) years. The median (IQR) size of endotracheal tube was 7.5 (6–9.3) mm with a median (IQR) duration of intubation of 36 (14–96) hours. The median (IQR) time to onset of symptoms after extubation was 24 (6–96) hours. Stridor was the most common symptom. The average delay in correctly identifying the OFTP was 26 hours. The diagnosis of tracheal pseudomembrane was confirmed by flexible bronchoscopy in 38 (70.4%) instances while rigid bronchoscopy was used in 46.3% subjects for removing the pseudomembrane. There were two deaths, one each in an adult and a pediatric subject. OFTP is a complication of tracheal intubation and presents with respiratory failure. The diagnosis can be confirmed by flexible bronchoscopy. Treatment involves removal of the obstructing membrane with either flexible or rigid bronchoscopy.

  • endotracheal intubation
  • tracheal membrane
  • post intubation stenosis
  • tracheal pseudomembrane
  • rigid bronchoscopy
  • upper airway obstruction

Introduction

Endotracheal intubation is a procedure performed for a myriad of indications, including administration of general anesthesia, airway protection, management of acute respiratory failure, and others.1,2 Endotracheal intubation is associated with several complications, including injury to vocal cords, tracheal ulceration, laryngeal edema, post-intubation tracheal stenosis, and tracheomalacia.3 Obstructive fibrinous tracheal pseudomembrane (OFTP) is an uncommon complication of endotracheal intubation that can result in failure of extubation.4–7 The symptoms are nonspecific (cough, hoarseness of voice, stridor, and respiratory distress) and can mimic a plethora of conditions, such as laryngeal spasm, laryngeal edema, vocal cord palsy, vocal cord dysfunction, heart failure, and retention of tracheobronchial secretions.5–7 A delay in making the correct diagnosis has been reported to result in respiratory failure that requires re-intubation and may occasionally lead to death.5–7 Treatment involves confirmation by flexible bronchoscopy and removal of the membrane using either rigid or flexible bronchoscopy.6–8 Herein, we present an illustrative case and perform a systematic review of literature on obstructive tracheal pseudomembrane that complicates tracheal intubation.

A 5-y-old male child was intubated and mechanically ventilated for 3 d for acute viral meningitis. After extubation, the patient complained of difficulty in breathing and was re-intubated. He was then managed with inhaled and systemic corticosteroids. Three days after the second intubation, he was extubated and was discharged the subsequent day. The next day, he again developed respiratory distress. Computed tomography of the neck revealed diffuse circumferential edema and narrowing of the airway at the level of T3 spine (Fig. 1). He was treated with inhaled epinephrine along with inhaled budesonide (0.5 mg) and intravenous dexamethasone (4 mg). However, his condition deteriorated, and he was referred to our center for further management. On admission, the child was tachypneic and had stridor. Arterial blood gas analysis revealed hypoxemia (pH 7.45; PaO2 = 78 mm Hg; PaCO2 = 34.2 mm Hg) on room air. A provisional diagnosis of post-intubation tracheal stenosis was considered, and an urgent rigid bronchoscopy was performed. After general anesthesia with sevoflurane and propofol, the child was intubated with a rigid tracheobronchoscope (size 4.5; Karl Storz, Berlin, Germany) with an internal diameter of 6.6 mm and an outer diameter of 7.3 mm. A membranous structure was identified around 2 cm from the vocal cords occluding the tracheal lumen by 80–90% (see Fig. 1). The rigid barrel was advanced further, and the membrane was gently dislodged with the barrel of the rigid scope and was pushed into the right main bronchus. The membrane was subsequently removed using the optical grasping forceps. The membrane was fleshy in nature and had a length of around 8–9 mm with a narrow lumen (Fig. 2). Flexible bronchoscopy performed the next day revealed remnant inflammation in the posterolateral wall of the trachea with no evidence of a membrane or luminal occlusion. Histopathological examination of the membrane showed a pseudomembrane composed of fibrin, necrotic material, and leukocytes (see Fig. 2). The child was discharged and is doing well at follow-up.

Fig. 1.
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Fig. 1.

A: Contrast-enhanced computed tomography of the neck revealing narrowing of the tracheal lumen by a soft tissue swelling in the subglottic region. B: Tracheal pseudomembrane visualized during rigid bronchoscopy causing 80% occlusion of the tracheal lumen.

Fig. 2.
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Fig. 2.

A and B: Fleshy membrane with a narrow lumen after removal. C: Photomicrograph showing the ulcerated tracheal lining epithelium with subepithelium demonstrating fibrinous exudate without significant inflammatory infiltrate (hematoxylin and eosin stain, ×200).

Methods

Search Strategy

We searched the PubMed and EmBase databases for articles published until October 15, 2015, describing OFTP using the free text terms: tracheal intubation complications AND membrane OR pseudomembrane OR obstructive fibrinous tracheal pseudomembrane OR tracheal membrane following endotracheal intubation OR membranous tracheitis OR pseudomembranous tracheal stenosis OR bridge-like subglottic stenosis. We reviewed the reference lists of all of the included articles and previous review articles. In addition, we searched our personal files.

Inclusion Criteria

We included full-text, peer-reviewed, cross-sectional studies, cohort studies, case reports, and abstracts that described the entity of OFTP. We excluded the following studies: (1) comments, editorials, and reviews; (2) studies published in non-English languages; (3) animal studies; and (4) studies describing tracheal pseudomembrane due to infection. For the current analysis, the pediatric age group was defined as subjects <18 y old.

Initial Review of Studies

The database thus created from the electronic searches was assimilated in the reference manager package Endnote X7.4 (Thomson Reuters, New York), and all duplicate citations were discarded. Two authors (ISS and RA) then screened these citations by review of the title and abstract to identify the relevant studies. Any disagreement was resolved by discussion between the authors. This database was then scrutinized again to include only primary articles. The full text of each of these studies was obtained and reviewed in detail.

Study Selection and Data Abstraction

Two authors (ISS and RA) independently assessed all of the articles for inclusion in the systematic review and extracted the data; the data were entered into a standard data extraction form. The following items were extracted: (1) publication details (authors, year of publication); (2) study design (prospective, retrospective, or case report); (3) number of subjects (including the demographic profile) and inclusion criteria; (4) details about sex, age, indication for intubation, and the type of endotracheal tube (ETT) used; (5) duration of intubation, cuff pressure; (6) time of onset of symptoms after extubation and the symptoms reported; (7) treatment given before the identification of correct diagnosis; (8) method of confirming the diagnosis of tracheal pseudomembrane and time delay in making the correct diagnosis; (9) details of the management of tracheal pseudomembrane; and (10) the final outcome. Any differences in the study selection and data extraction process between the 2 authors were resolved by discussion.

Statistical Analysis

Data from all individual subjects (case reports or case series) were entered into a spreadsheet (Excel 2016, Microsoft Corp, Redmond, Washington). Data were analyzed using the commercial statistical package SPSS 22 (IBM Corp, Armonk, New York) and are presented in a descriptive fashion as proportions, mean (95% CI), or median (interquartile range [IQR]). A subgroup analysis of pediatric and adult subjects was also performed. Chi-square and Mann-Whitney U tests were used to compare the categorical and numerical data, respectively. A P value of ≤.05 was considered significant. An institutional ethics committee approval was not required because this was a systematic review of published data.

Results

The initial database search yielded 415 studies, of which 307 studies were excluded after initial review (Fig. 3). One hundred eight studies were assessed for eligibility, and finally 28 studies were included in the current systematic review (see the supplementary materials at http://www.rcjournal.com).4–31

Fig. 3.
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Fig. 3.

Flow chart.

Demographic Characteristics

A total of 54 subjects (including the illustrative case), both adult (n = 39) and pediatric (n = 15), with an age range of 2 months to 85 y were identified. The median age of the study population (61.1% females) was 40.5 (IQR 14.8–60.5). The most common indication for endotracheal intubation was induction of general anesthesia for surgical procedures followed by acute hypoxemic respiratory failure (Table 1). In the pediatric age group, the most common indication was administration of general anesthesia for surgical interventions, whereas in adults, acute hypoxemic respiratory failure formed the most frequent indication (Table 2).

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Table 1.

Pooled Analysis of Cases Included in the Systematic Review

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Table 2.

Comparison of Clinical Characteristics Between Pediatric and Adult Population

ETT Attributes

Various types of ETTs were used for intubation, including cuffed rubber tubes, cuffed silicone tubes, and uncuffed silicone tubes. Cuffed ETTs were used in 37.7%, whereas cuffed high volume, low pressure, and uncuffed endotracheal tubes were used in 22.6 and 20.8% of the study population, respectively. An uncuffed ETT was used in all pediatric subjects. Intubation was traumatic in 9 subjects. The median (IQR) size of the ETT was 7.5 (6–9.3) mm. The information regarding ETT cuff pressure was available for 12 subjects, and the pressure was maintained at <25 cm H2O in 11 of these subjects. In 3 other subjects, the ETT cuff was not inflated. The median (IQR) duration of intubation was 36 (14–96) h. Ten subjects had an ETT dwelling time of ≤5 h. There was no difference in the duration of intubation in the pediatric and the adult age group (see Table 2).

Presentation of OFTP

The median (IQR) time to onset of symptoms after extubation was 24 (6–96) h. The median time to onset of symptoms was significantly shorter in pediatric subjects (6 h vs 30 h in pediatric vs adult subjects, respectively, P = .002). In 5 subjects (including the index case), the symptoms manifested immediately after extubation. Stridor was the most common symptom, and unrelenting cough and hoarseness of voice were the other symptoms reported by the subjects. In 17 subjects, the tracheal pseudomembrane resulted in respiratory failure, resulting either in re-intubation or definitive treatment. In most of the subjects, the symptoms were attributed to laryngeal edema. Respiratory failure at presentation was more frequently present in pediatric than in adult subjects (53.3% vs 23.1%, P = .032). The information regarding treatment received before the correct diagnosis was available for 35 subjects. Nebulization with bronchodilator (salbutamol), epinephrine, and corticosteroids and/or re-intubation were the treatments provided to subjects before identifying tracheal pseudomembrane as a cause of symptoms.

Diagnosis of OFTP

Computed tomography of the neck and/or thorax was done in 11 subjects (20.4%) and could correctly identify tracheal membrane or mass as a cause of symptoms. In 3 subjects (5.5%), lateral radiograph of the neck revealed abnormality of the trachea and led to confirmation by bronchoscopy. The diagnosis of tracheal pseudomembrane was confirmed by flexible bronchoscopy in 70.4% of the subjects, whereas a rigid bronchoscopy was performed in 16.7% of the subjects to confirm the diagnosis. In 6 subjects, the tracheal pseudomembrane was identified ex vivo after it was spontaneously expulsed, whereas in one subject, it was identified during autopsy. There was a delay in correctly identifying OFTP by a median of 26 h. The tracheal pseudomembrane caused a median (IQR) obstruction of 80% (70–90%) of the tracheal lumen.

Management of OFTP

Rigid bronchoscopy was used in the management of OFTP in 46.3%, whereas a flexible bronchoscopy was used in 31.5% of subjects. In one subject each, tracheostomy and electrocautery with snaring was performed during rigid bronchoscopy to relieve the symptoms.9,23 Rigid bronchoscopy was used more frequently to relieve the airway obstruction in adults (56.4%), whereas flexible bronchoscopy was used more often in pediatric subjects (60%). Spontaneous expectoration of the membrane was seen in 6 subjects (5 adults, one child).9,21,26,28,31 Recurrence of symptoms and repeated formation of the tracheal membrane was encountered in 2 subjects (both adults).4 There were 2 deaths (one each in adult and pediatric subjects): One was due to progression of sepsis, and in another subject, tracheal pseudomembrane was not identified premortem.5,6

Discussion

The results of the systematic review suggest that OFTP is an uncommon but potentially fatal complication following tracheal intubation. Respiratory failure may be encountered in almost one third of the patients at presentation, which requires urgent intervention. There is usually a delay in correctly diagnosing OFTP due to nonspecific symptoms. The confirmation requires direct visualization of the membrane with either flexible or rigid bronchoscopy. Definitive treatment requires relieving the airway obstruction with bronchoscopic removal of the membrane. A previous systematic review on the same topic was composed of only 24 subjects with only one pediatric subject. The present review has twice the number of subjects with 15 pediatric subjects.

Etsten and Mahler4 first described OFTP in 3 adult subjects who were intubated with a Magill low pressure rubber endotracheal tube for induction of general anesthesia while surgical interventions were performed. Subsequently, OFTP was described in adults and children who were intubated for a variety of indications, including acute respiratory failure, airway protection, and others.5,6,10,31 The most common symptoms consist of hoarseness of voice, stridor, or respiratory failure that can occur either immediately or after a few hours to days. Most of these symptoms are nonspecific and can also be seen in laryngeal edema and/or cord paralysis.4–7,22 Due to missed diagnosis, patients generally receive supportive care in the form of nebulized bronchodilators (salbutamol, adrenaline) and corticosteroids (both systemic and inhaled) or re-intubation before correct diagnosis.4–8,21,31 There is considerable delay in the diagnosis, which can have unfavorable outcomes, including mortality reported in a case with missed diagnosis.5 In a systematic review comprising 24 subjects, 96.3% of the subjects were symptomatic; the symptoms generally appeared immediately after extubation but could be delayed as long as 70 d after extubation.8,18 In the illustrative case presented in the current study, the child developed stridor immediately after extubation and required re-intubation; there was a delay in making the correct diagnosis by 10 d.

The exact etiopathogenesis of OFTP remains unknown, and various hypotheses have been postulated. The subglottic area is the narrowest part of the larynx that is completely surrounded by the cricoid cartilage that forms a rigid circle. Due to this, the subglottic mucosa is vulnerable to injury that may occur during intubation. Initial injury results in accumulation of the desquamated epithelial cells that subsequently form the subglottic membrane.4 This theory is supported by the fact that the most common location of the tracheal pseudomembrane is the subglottic region.4,10–13 However, in a few other cases, the membrane was located in the mid-trachea, the distal trachea, or the entire length of the trachea.6,8,14,24 Another theory suggests OFTP to be the first step in the development of tracheal stenosis resulting from ischemic necrosis of tracheal mucosa and submucosa due to inflated endotracheal cuff.5 However, this logic cannot explain the development of OFTP in subjects where uncuffed endotracheal tubes or high-volume low pressure tubes were used.4–7,12,13,17,18,22 Further, OFTP has also been reported in subjects where the cuff pressure was maintained below 25 cm H2O6,19,22 and in subjects who were intubated for as little as half an hour.6,13 Aspiration of gastric contents leading to caustic injury has also been proposed as a contributing factor. It is likely that a combination of these factors results in the formation of OFTP after the initial trauma to the tracheal mucosa followed by an aberrant healing process.

The presence of OFTP is confirmed by direct visualization of the membrane during flexible bronchoscopy (Fig. 4). However, flexible bronchoscopy cannot be performed in patients who have severe respiratory distress or respiratory failure. In such cases, computed tomography of the neck and the thorax can provide clues to the cause of the respiratory symptoms. Rigid bronchoscopy is the modality of choice, both for confirming and relieving the upper airway obstruction due to OFTP in patients with respiratory failure, as was done in the illustrative case.

Fig. 4.
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Fig. 4.

A proposed algorithm for the diagnosis of obstructive fibrinous tracheal pseudomembrane in the ICU. ETT = endotracheal tube; TT = tracheostomy tube.

In our opinion, the safest treatment modality for OFTP is rigid bronchoscopy, which should be preferred over flexible bronchoscopy. Rigid bronchoscopy offers several advantages over flexible bronchoscopy. Rigid bronchoscopy allows ventilation during diagnosis and removal of OFTP, thus maintaining airway control at all times. This is important because OFTP causes significant luminal compromise (70–90%), and the introduction of the flexible bronchoscope may further obstruct the airway. Also, in a tachypneic patient, flexible bronchoscopy may worsen the dynamic tracheal obstruction due to a floppy membrane. If the tracheal membrane is large, thick, and adherent, removal and manipulation may not be possible using the flexible bronchoscope.

Conclusions

OFTP can complicate tracheal intubation and can cause respiratory failure. The diagnosis is confirmed by flexible bronchoscopy, whereas mechanical debridement using a rigid bronchoscope should be preferred, wherever available. A high index of clinical suspicion should be maintained for OFTP irrespective of the duration of intubation, type of endotracheal tube used, and the time to onset of symptoms after extubation. This is important because failure to recognize OFTP may be associated with a fatal outcome.

Footnotes

  • Correspondence: Ritesh Agarwal MD DM, Department of Pulmonary Medicine, Postgraduate Institute of Medical Education and Research, Sector-12, Chandigarh-160012, India. E-mail: agarwal.ritesh{at}outlook.in.
  • Supplementary material related to this paper is available at http://www.rcjournal.com.

  • The authors have disclosed no conflicts of interest.

  • Copyright © 2016 by Daedalus Enterprises

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Respiratory Care: 61 (9)
Respiratory Care
Vol. 61, Issue 9
1 Sep 2016
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Obstructive Fibrinous Tracheal Pseudomembrane After Endotracheal Intubation
Inderpaul Singh Sehgal, Sahajal Dhooria, Amanjit Bal, Ashutosh N Aggarwal, Digambar Behera, Ritesh Agarwal
Respiratory Care Sep 2016, 61 (9) 1260-1266; DOI: 10.4187/respcare.04662

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Obstructive Fibrinous Tracheal Pseudomembrane After Endotracheal Intubation
Inderpaul Singh Sehgal, Sahajal Dhooria, Amanjit Bal, Ashutosh N Aggarwal, Digambar Behera, Ritesh Agarwal
Respiratory Care Sep 2016, 61 (9) 1260-1266; DOI: 10.4187/respcare.04662
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Keywords

  • endotracheal intubation
  • tracheal membrane
  • post intubation stenosis
  • tracheal pseudomembrane
  • rigid bronchoscopy
  • upper airway obstruction

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