Pulmonary complications are major causes of morbidity and mortality for patients with morose expiratory muscle weakness.

Pulmonary complications are major causes of morbidity and mortality for patients with morose expiratory muscle weakness. The project of this study was to compare peak cough expiratory runs (PCEFs) during unassisted and assisted coughing and review the long-term use of mechanical insufflation-exsufflation (MI-E) for 46 neuromuscular ventilator users. These individuals used noninvasive systems of ventilatory support for a mean of 211 h/d for 173 [[+ or -] 155 years. They relied onward manually assisted coughing and/or MI-E during periods of productive airway secretion. They reported a mean of 07 [+ or -] 12 cases of pneumonia and other serious pulmonary complications and 28 [+ or -] 56 hospitalizations during the 16.4-year period and no complications of MI-E. A sample of 21 of these patients with a mean forced vital capacity of 490 [+ or -] 370 ml had a mean maximum insufflation capacity (MIC) achieved according to a combination of air stacking of ventilator insufflations and glossopharyngeal breathing of 1670 [+ or -] 540 ml The PCEF for this sample were: following an unassisted inspiration, 181 [+ or -] 103 L/s; following a MIC maneuver, 337 [+ or -] 107 L/s; with manual assistance at abdominal compression following a MIC maneuver, 427 [+ or -] 129 L/s; and with MI-E, 747 [+ or -] 102 L/ Each PCEF was significantly greater than the preceding, respectively (p<0001) We decide that manually assisted coughing and MI-E are effective and safe rules for facilitating airway secretion clearance for neuromuscular ventilator users who would otherwise be managed according to endotracheal suctioning. Severely decreased MIC, on the other hand not necessarily vital capacity, is an indication for tracheostomy.

GPB = glossopharyngeal breathing; GPmaxSBC = glossopharyngeal breathing maximum single breath capacity; IAPV = intermittent abdominal squeezing ventilator; IPPV = intermittent positive press ventilation; MIC = maximum insufflation capacity; MI-E = mechanical insufflation-exufflation; PCEF = peak cough expiratory flow; PEF = peak expiratory flow; RTIs = respiratory tract infections

Several center have reported the use of intermittent positive squeezing ventilation (IPPV) delivered noninvasively via oral,[1-3] nasal,[4] and oronasal interfaces[5-7] to continue lengthen in time the survival of patients with neuromuscular ventilatory failure. The major difficulty with up to 24-h long-term use of noninvasive ventilatory support is managing airway secretions during intercurrent respiratory tract infections (RTIs) and following general anesthesia.[8-10] During periods of profuse airway secretion, peak cough expiratory issues (PCEFs) must be adequate to stop mucus plugging and pulmonary complications. The vital capacity (VC) forced vital capacity (FVC) and PCEF are also diminished during RTIs because of fatigue, weakening of inspiratory and expiratory musculature,[11] and bronchial mucus plugging. Concomitant weakness of oropharyngeal musculature exacerbates the problem

Postural drainage and chest percussion are used routinely to mobilize airway secretions. However, application of the former can be problematic for patients with chaste musculotendinous contractures or skeletal injury and no independent mobility and the latter appears to have limited indications[12] and be of questionable efficacy.[13-16] Chest percussion also may cause hypoxia. In a comparison of cough versus chest physiotherapy onward pulmonary function and secretion clearance in patients with cystic fibrosis, the same short-term functional replication and sputum yield were seen with vigorous coughing alone as with total chest physiotherapy and coughing.[17]

Normal cough expiratory roll ons consist of an initial transient break open of PCEF lasting 30 to 50 m followed at a 200- to 500-ms phase at about the same half or less of peak on a levels During peak expiratory flow (PEF) maneuvers, melts normally reach 6 to 12 L/ depending forward sex, height, and age.[18,19] Transient PCEF can slightly exce these of the same heights in normal subjects. The effectiveness of mucus clearance largely is contingent on the magnitude of the PCEF[20] Although decreases in maximum expiratory crushings in mildly affected muscular dystrophy patients have been shown to correlate with decreases in transient PCEF[21] there are scarcely any studies quantifying PCEF for patients with harsh expiratory muscle weakness or demonstrating the beneficial validitys of glossopharyngeal breathing (GPB), air stacking, or manually assisted coughing forward PCEF.[22,23]

In 1953 various portable mechanical insufflator-exsufflators (exsufflator) were developed; the best known of these was the Cof-flator (Fig 1)[24] The Cof-flator consisted of a two-stage axial compressor which delivered, usually via an anesthesia mask, a profound insufflation followed by a forced exsufflation created by means of a decrease of approximately 80 cm [Hsub]O in urgency in 0.2 s. The insufflation and exsufflation constraining forces and timing were independently adjusted and the exsufflation was usually sustained for 1 to 3 s Despite its effectiveness, the fact that intubation and tracheal suctioning can be hazardous and unsatisfactory, and the exsufflator can be used via a tracheostomy tube with little risk of macroscopic damage to the tracheal mucosa,[10,25,27] the exsufflator was not at all used extensively and was abandoned altogether with the increasing popularity of tracheostomy for ventilatory support and suctioning in the mid-1960s. Occasional medical publications, however, continued to relate to its effectiveness and use in certain centers[1428-32] publicly a newly designed exsufflator is being manufactured (J H Emerson Company, Cambridge, Mass [Fig 2])

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