Material wear of polymeric tracheostomy tubes: a six-month study.

OBJECTIVES: The objectives were to study long-term material wear of tracheostomy tubes made of silicone (Si), polyvinyl chloride (PVC), and polyurethane (PU) after 3 and 6 months of clinical use. STUDY DESIGN: The study has a prospective and comparative design. METHODS: Nineteen patients with long-term tracheostomy, attending the National Respiratory Center in Sweden, were included, n = 6 with Si tubes, n = 8 with PVC tubes, and n = 5 with PU tubes. The tubes were exposed to the local environment in the trachea for 3 and 6 months and analyzed by scanning electron microscopy, attenuated total reflectance Fourier transform infrared spectroscopy, and differential scanning calorimetry. RESULTS: All tubes revealed severe surface changes. No significant differences were established after 3 or 6 months of exposure between the various materials. The changes had progressed significantly after this period, compared to previously reported changes after 30 days of exposure. The results from all analyzing techniques correlated well. CONCLUSIONS: All tubes, exposed in the trachea for 3-6 months, revealed major degradation and changes in the surface of the material. Polymeric tracheostomy tubes should be changed before the end of 3 months of clinical use.

Tracheostomy inner cannula care: a randomized crossover study of two decontamination procedures.

BACKGROUND: Today several methods for decontaminating inner cannulae exist. These methods are not based on scientific data, but often on local clinical tradition. This study compares two different decontamination methods. The aim was to find a practical and safe decontamination method. It is a randomized, single-blinded, comparative crossover study. METHODS: Fifty outpatients with long-term tracheostomy with an inner cannula were consecutively included and randomly allocated to begin with one of two different treatment sequences: detergent and chlorhexidine-alcohol (A) or detergent (B). Samples for bacterial culture were taken before and after decontamination, and the number of bacteria colonies was counted. RESULTS: Before decontamination, the inner cannulae grew high numbers of bacteria, which were parts of the normal flora of the upper respiratory tract and did not differ significantly between the two sequences (AB; BA). The primary variable was the culture count value after chlorhexidine-alcohol/detergent (A) and detergent (B). The effects of both methods were larger than expected, and the results showed a nearly total elimination of organisms. The equivalence criterion, ratio of mean colony counts (A/B) >0.8, was met at a significance level of P<0.001. CONCLUSIONS: Cleaning the tracheostomy inner cannula with detergent and water is sufficient to achieve decontamination.

Clinical use and material wear of polymeric tracheostomy tubes.

OBJECTIVES: The objectives were to compare the duration of use of polymeric tracheostomy tubes, i.e., silicone (Si), polyvinyl chloride (PVC), and polyurethane (PU), and to determine whether surface changes in the materials could be observed after 30 days of patient use. METHODS: Data were collected from patient and technical records for all tracheostomized patients attending the National Respiratory Center in Sweden. In the surface study, 19 patients with long-term tracheostomy were included: six with Bivona TTS Si tubes, eight with Shiley PVC tubes, and five with Trachoe Twist PU tubes. All tubes were exposed in the trachea for 30 days before being analyzed by scanning electron microscopy (SEM) and attenuated total reflectance Fourier transform infrared spectroscopy (ATR-FTIR). New tubes and tubes exposed in phosphate-buffered saline were used as reference. RESULTS: Si tubes are used for longer periods of time than those made of PVC (P<.0001) and PU (P=.021). In general, all polymeric tubes were used longer than the recommended 30-day period. Eighteen of the 19 tubes exposed in patients demonstrated, in one or more areas of the tube, evident surface changes. The morphologic changes identified by SEM correlate well with the results obtained by ATR-FTIR. CONCLUSIONS: Si tracheostomy tubes are in general used longer than those made of PVC and PU. Most of the tubes exposed in the trachea for 30 days suffered evident surface changes, with degradation of the polymeric chains as a result.

Quality-of-life evaluation of patients with neuromuscular and skeletal diseases treated with noninvasive and invasive home mechanical ventilation.

BACKGROUND: Home mechanical ventilation (HMV) is known to be a successful therapy for chronic respiratory insufficiency, with regard to long-term survival. However, the quality of life (QoL) of patients receiving HMV has not previously been systematically investigated. The purpose of this study was to assess the QoL of patients with neuromuscular disorders and skeletal deformities (ie, restrictive lung disease) receiving HMV. METHODS: Patients receiving HMV treated by tracheostomy or noninvasive ventilation (NIV). Three different, standardized, and validated questionnaires were used: the Sickness Impact Profile (SIP), the Health Index (HI), and the Sense of Coherence (SOC) scale. Underlying diseases were postpolio dysfunction (37%), neuromuscular disorder (20%), scoliosis (15%), and other diseases (28%). RESULTS: The group treated with tracheostomy had higher HI scores than the group treated with NIV. For the three main diagnosis groups treated with tracheostomy or NIV, the patients with postpolio dysfunction treated with tracheostomy had lower SIP scores than the patients with postpolio dysfunction treated with NIV. This was in contrast to the patients with neuromuscular disorders treated with tracheostomy, who had higher scores in the SIP, compared with patients with postpolio dysfunction treated with tracheostomy and patients with neuromuscular disorders treated with NIV. A SIP score > 10% indicates a functional disability of clinical importance, and a high score on the HI and SOC scale indicates good perceived health. For the three main diagnosis groups treated with NIV, the patients with scoliosis had no dysfunction of clinical importance (4.6 +/- 3.7) on the SIP score compared with patients with postpolio dysfunction (15.5 +/- 7.6) and patients with neuromuscular disorders (13.2 +/- 5.2) [mean +/- SD]. The men showed more dysfunction in the SIP score than the women. CONCLUSION: Patients receiving HMV reported a good perceived health, despite severe physical limitations. The patients with postpolio dysfunction and the patients with scoliosis treated with tracheostomy perceived the best health, compared with NIV for this diagnosis.