Validation of a portable nitric oxide analyzer for screening in primary ciliary dyskinesias
نویسندگان
چکیده
BACKGROUND Nasal nitric oxide (nNO) levels are very low in primary ciliary dyskinesia (PCD) and it is used as a screening test. METHODS We assessed the reliability and usability of a hand-held analyser in comparison to a stationary nitric oxide (NO) analyser in 50 participants (15 healthy, 13 PCD, 22 other respiratory diseases; age 6-79 years). Nasal NO was measured using a stationary NO analyser during a breath-holding maneuver, and using a hand-held analyser during tidal breathing, sampling at 2 ml/sec or 5 ml/sec. The three methods were compared for their specificity and sensitivity as a screen for PCD, their success rate in different age groups, within subject repeatability and acceptability. Correlation between methods was assessed. RESULTS Valid nNO measurements were obtained in 94% of participants using the stationary analyser, 96% using the hand-held analyser at 5 ml/sec and 76% at 2 ml/sec. The hand-held device at 5 ml/sec had excellent sensitivity and specificity as a screening test for PCD during tidal breathing (cut-off of 30 nL/min,100% sensitivity, >95% specificity). The cut-off using the stationary analyser during breath-hold was 38 nL/min (100% sensitivity, 95% specificity). The stationary and hand-held analyser (5 ml/sec) showed reasonable within-subject repeatability(% coefficient of variation = 15). CONCLUSION The hand-held NO analyser provides a promising screening tool for PCD.
منابع مشابه
Author's response to reviews Title:Validation of a portable nitric oxide analyser for screening in primary ciliary dyskinesia Authors:
متن کامل
Ciliary dyskinesias: primary ciliary dyskinesia in adults
Primary ciliary dyskinesia (PCD) is a genetic disorder of cilia structure and function, chronic infections of the respiratory tract, fertility problems and disorders of organ laterality. Establishing a definitive diagnosis can be challenging, requiring a compatible phenotype and detection of ciliary functional and ultra-structural defects, along with newer screening tools such as nasal nitric o...
متن کاملNitric oxide in primary ciliary dyskinesia.
Nitric oxide is continually synthesised in the respiratory epithelium and is upregulated in response to infection or inflammation. Primary ciliary dyskinesia (PCD) is characterised by recurrent sinopulmonary infections due to impaired mucociliary clearance. Despite chronic infections, nasal nitric oxide in such patients is markedly reduced and is used as a screening test for this condition. The...
متن کاملNasal nitric oxide screening for primary ciliary dyskinesia: systematic review and meta-analysis.
Nasal nitric oxide (nNO) concentrations are low in patients with primary ciliary dyskinesia (PCD) providing a noninvasive screening test. We conducted a systematic review of the literature to examine the utility of nNO in screening for PCD, in particular 1) different respiratory manoeuvres during sampling (velum closure, tidal breathing, etc.), 2) accuracy in screening young/uncooperative child...
متن کاملNasal nitric oxide is low early in life: case study of two infants with primary ciliary dyskinesia.
Nasal nitric oxide levels are low in patients with primary ciliary dyskinesia, but it is not known whether this defect is already present in the first months of life. The current authors measured nasal nitric oxide in two infants with situs inversus and primary ciliary dyskinesia, diagnosed by electron microscopy at 4 and 6 months of age, and in five healthy control infants. Nasal nitric oxide ...
متن کامل