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Query: UMLS:C0344329 (collapse)
 28,634 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

During the period of 1 year (1988 to 1989), five infants, aged 3 weeks to 10 months, presented with recurrent respiratory distress following repair of esophageal atresia with tracheoesphageal fistula (EA/TEF). These patients had associated congenital anomalies, including right aortic arch (1), biliary atresia (1), and a long gap that required esophageal elongation by spiral myotomy (1). The patients were evaluated for tracheomalacia using cinecomputed tomography (cine-CT; C-100 Scanner, Imatron, San Francisco, CA), which provides images of eight levels (8-mm interval) simultaneously with 0.7 second time intervals of cine-CT. Dynamic studies of the trachea by cine-CT showed tracheal collapse that was most significant during expiration in the segment immediately above and at the aortic arch. These patients underwent aortosternopexy. Via a right second intercostal approach, the ascending aorta and aortic arch were lifted anteriorly using two to four sutures of 5-0 Tevdek on pledgets placed between the tunica media and adventitia of the side walls of the aorta and the adjacent sternum. Respiratory distress was significantly improved postoperatively. Preliminary experience with these patients allows us to conclude that (1) cine-CT is a useful technique for diagnosing tracheomalacia; (2) it provides objective indication for its correction by aortosternopexy; and (3) the refined technique in placing sutures on the aorta may reduce the surgical risks of aortosternopexy.
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PMID:Aortosternopexy for tracheomalacia following repair of esophageal atresia: evaluation by cine-CT and technical refinement. 238 Aug 94

Tracheomalacia was created by removing the posterior 50% of the circumference of eight cartilage rings (5-6 cm in length) from the intrathoracic trachea in each of 12 piglets while leaving the mucosa intact. In 6 animals an autologous, free tibial periosteal graft was applied over the defect (graft group). The remaining 6 piglets served as the control group. In all animals, a silastic stent was left in the trachea for 2 weeks to prevent immediate tracheal collapse. The presence of tracheomalacia was assessed 6-8 weeks after surgery. At bronchoscopy total tracheal collapse during coughing occurred only in the controls. As the animals went from quiet breathing to coughing, mean intrathoracic pressure increased from 5 to 80 cm H2O in both groups, and average sagittal tracheal diameter decreased by 10% in the graft group and 71% in the controls. During coughing, mean resistance to airflow across the defect increased by 0.005 +/- 0.002 cm H2O/liter/min in the graft group, by 0.083 +/- 0.96 cm H2O/liter/min in the controls (P less than 0.005), and by 0.027 cm H2O/liter/min at the same tracheal level in two normal pigs. At sacrifice 12 weeks postoperatively, bone and collagenized fibrous tissue had been produced by all grafts, without evidence of stricture. This study shows that experimentally induced tracheomalacia can be treated successfully by the application of an autologous periosteal tibial graft, which becomes incorporated into the weakened tracheal wall.
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PMID:Tracheomalacia: an experimental animal model for a new surgical approach. 358 29

Five patients with severe fibrous subglottic and tracheal stenosis were treated by endoscopic radial laser incision and dilation using both carbon dioxide and neodymium:yttrium aluminum garnet lasers. Good results were noted without complications in all patients in a follow-up period of at least 1 year. Careful selection of patients, excluding those with tracheal collapse or tracheomalacia, and preservation of tracheal epithelium with minimal heat and mechanical trauma are considered essential for good results.
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PMID:Endoscopic treatment of subglottic and tracheal stenosis by radial laser incision and dilation. 368 53

During the past 7 years, 41 infants were treated for tracheomalacia. The etiology was primary/congenital in 28 patients and secondary/acquired in 16 patients, of which three patients were originally in the primary group. The primary group consisted of patients with pulsatile tracheomalacia but normal vascular anatomy, idiopathic disease, or tracheomalacia associated with tracheoesophageal fistula. The secondary group consisted of patients with tracheal compression due to great vessel abnormalities, or tracheostomy-tracheomalacia. Diagnosis was made by bronchoscopic demonstration of major (greater than 40%) collapse of the trachea. Treatment consisted of conservative therapy, tracheostomy, aortopexy, or tracheal reconstruction. The 15 patients with mild primary tracheomalacia treated conservatively had gradual resolution of symptoms by the age 2 years. All five patients with primary tracheomalacia treated by tracheostomy developed secondary tracheomalacia and/or cicatrix at the tracheostomy site. In the 9 patients with primary tracheomalacia treated by aortopexy, 5 are symptom free, 1 is improved, 1 had recurrent apnea, and 2 died, 1 from unrelated complications. Of the 10 patients in the acquired group treated by aortopexy, 6 were cured, 2 were improved, and 2 failed. Of 6 patients with tracheostomy-tracheomalacia, 3 were eventually extubated, 1 had major reconstruction, and 2 had tracheostomies when lost to follow-up at 1 and 5 years. Our conclusions are that, when feasible, conservative therapy in milder cases is preferred, and no perfect operation currently exists for severe tracheomalacia although aortopexy may have less long-term morbidity than tracheostomy.
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PMID:Contemporary surgery of tracheomalacia. 372 3

The effect of high-frequency jet ventilation (HFJV) on both tracheal dimensions and mechanics was evaluated in preterm and term rabbit airways. Seven tracheal segments were studied at 27 days (group I) and 31 days (group II) of gestation, respectively. Tracheal dimensions and segmental pressure-volume relationships were determined before and after 60 minutes of HFJV (peak pressure 20 cm H2O; mean airway pressure 6.7 to 6.8 cm H2O at 10 Hz). Both tracheal lengths and diameters increased significantly (p less than 0.01) in each group and resulted in increased tracheal volumes: 109% in group I (p less than 0.01) and 60% in group II (p less than 0.01). The mean specific tracheal compliance decreased in group I, from 0.036 cm H2O-1 to 0.015 cm H2O-1 (p less than 0.01), and in group II from 0.029 cm H2O-1 to 0.021 cm H2O-1 (p less than 0.01). Furthermore, the collapsing transmural pressure (the pressure required for total collapse of tracheal segments) decreased significantly (p less than 0.01) in both groups. These data demonstrate significant dimensional and mechanical deformation of tracheal segments after HFJV. An increased propensity toward collapsibility is also observed following HFJV. These changes are similar to those with tracheomalacia. The influence of such deformation on tracheal gas flow during HFJV needs to be further investigated.
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PMID:Effect of high-frequency jet ventilation on preterm and rabbit tracheal mechanics. 380 74

The long-term functional results of splinting a collapsing major airway with a silastic Marlex mesh prosthesis were assessed. Six patients in whom follow-up has been longer than 4 years (mean 5.3 years) were studied. The prosthetic semirigid splints had been implanted in five children with tracheomalacia and one with bronchomalacia. Mean age at the time of airway splinting was 4 years (range 6 months to 8 years). At their last clinical evaluation, all six children were leading normal active lives. Three had mild respiratory symptoms not related to the splinting. The only long-term complication was a serous effusion that developed around the splint and compressed the trachea in one child 2 years postoperatively. Tracheal fluoroscopy, barium swallow, and computed tomography scans of the trachea in five patients demonstrated satisfactory tracheal caliber without airway collapse during expiration and coughing. Pulmonary function testing showed a mild increase in airway resistance in one child who had had a tracheostomy. These results demonstrate that the application of composite synthetic graft to a segment of a malacic airway in young patients can provide long-term relief from airway collapse without compromising airway growth.
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PMID:Long-term functional results of prosthetic airway splinting in tracheomalacia and bronchomalacia. 381 91

Congenital bronchomalacia is a disease typically associated with infants between 1 and 12 months of age; cases in children less than 1 month of age are rare. Bronchomalacia is commonly associated with tracheomalacia and rarely warrants operative intervention. Three cases of bronchomalacia are presented, including two unusual cases of bronchomalacia associated with neuromuscular disorder, one complicated by hypotonia. These patients required ventilatory support in the form of continuous positive airway pressure to prevent lobar collapse. Following tracheobronchial and neuromuscular maturation, these infants were able to weaned from respiratory assistance without further sequelae. Bronchomalacia is discussed, the literature reviewed, and the standard therapies presented. The results indicate a possible relationship between neuromuscular disorders and respiratory collapse.
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PMID:Bronchomalacia in the neonate. 390 58

Tracheomalacia is an important cause of recurrent respiratory complications following correction of cogenital oesophageal atresia. It constitutes a well-defined syndrome, which requires clinical recognition and surgical correction in the most severely affected infants. Five cases are described. Special investigations confirmed tracheal collapse. Permanent relief of symptoms was achieved by suspension of the aortic arch to the sternum.
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PMID:Oesophageal atresia--severe tracheomalacia and its correction by aortopexy. 390 93

An expandable stainless steel stent was formulated for use in the treatment of tracheobronchial stenosis, tracheomalacia, and airway collapse following tracheal reconstruction. The stents were placed through an endotracheal tube into the trachea and bronchi of 11 healthy dogs. The stents expanded over time, substantially increasing the diameter of the lumen. Slight migration occasionally occurred, while an inflammatory reaction was noted in each animal. The stents were successfully used in the treatment of two cancer patients to dilate a postoperative bronchial stenosis that caused pneumonia and to support a tracheal graft that collapsed with respiration. Because of the stent migration in experimental studies, designs are being tested to develop stents with greater stability. These stents may be effective in overcoming stenosis caused by scarring, extrinsic compression, and collapse of reconstructed tracheobronchial structures.
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PMID:Tracheobronchial tree: expandable metallic stents used in experimental and clinical applications. Work in progress. 394 57

The authors studied the inter- and postoperative complications arising in a series of 690 consecutive interventions on thyroid. The results showed a cipher mortality and a 3% aggregate morbidity. In 0.9% of cases, compressive hematomata in the thyroid loggia, collapse of the tracheal wall due to tracheomalacia or bilateral paralysis of the vocal cords determined an acute respiratory stoppage. 1.4% of the treated patients suffered from alterations in the motility of the vocal cords, ascribable to damage of the recurrent nerves. 0.9% of cases showed a postoperative parathyroid insufficiency, the nature of which, however, was always temporary. The incidence of complications, in the whole, resulted significantly higher in the patients undergoing iterative surgery, in respect of those operated on the first time.
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PMID:[Intra- and postoperative complications in surgery of the thyroid gland]. 407 57


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