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Sniff nasal inspiratory pressure as a prognostic factor of tracheostomy or death in amyotrophic lateral sclerosis

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Abstract

Forced vital capacity (FVC) shows limitations in detecting respiratory failure in the early phase of amyotrophic lateral sclerosis (ALS). In fact, mild-to-moderate respiratory muscle weakness may be present even when FVC is normal, and ALS patients with bulbar involvement might not be able to perform correctly the spirometry test. Sniff nasal inspiratory pressure (SNIP) is correlated with transdiaphragmatic strength. We evaluated SNIP at baseline as a prognostic factor of tracheostomy or death in patients with ALS. In a multidisciplinary tertiary care center for motorneuron disease, we enrolled 100 patients with ALS diagnosed with El Escorial criteria in the period between January 2006 and December 2010. Main outcome measures were tracheostomy or death. RECursive Partitioning and AMalgamation (RECPAM) analysis was also used to identify subgroups at different risks for the tracheostomy or death. Twenty-nine patients with ALS reached the outcome (12 died and 17 had tracheostomy). Using a multivariate model SNIP correctly classified the risk of the composite event within 1 year of follow-up with a continuous Net Reclassification Improvement cNRI of 0.58 (p = 0.03). Sex, Amyotrophic Lateral Sclerosis Functional Rating Scale revisited, site of onset, and FVC did not improve the classification of prognostic classes. SNIP ≤18 cmH2O identified the RECPAM class with the highest risk (Class 1, hazard ratio = 9.85, 95 % confidence interval: 2.67–36.29, p < 0.001). SNIP measured at baseline identified patients with ALS with initial respiratory failure. Finally, using only ALS patients with spinal onset of the disease, our findings were mostly overlapping with those reported in the models including the whole sample. At baseline, SNIP appeared to be the best predictor of death or tracheostomy within 1 year of follow-up. The measurement of SNIP in the early phase of the disease may contribute to identify patients with high risk of mortality or intubation. SNIP may also provide an additional tool for baseline stratification of patients with ALS in clinical trials.

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Abbreviations

ALS:

Amyotrophic lateral sclerosis

ALSFRS-R:

Revised amyotrophic lateral sclerosis Functional Rating Scale

AUC:

Area under the receiver operating characteristic Curve

BDI:

Beck Depression Inventory

EI:

Executive index

FAB:

Frontal Assessment Battery

FVC:

Forced vital capacity

FTD:

Frontotemporal dementia

NIV:

Noninvasive ventilation

MMSE:

Mini-Mental State Examination

MMT:

Manual muscle testing

MoCA:

Montreal Cognitive Assessment

95 % CI:

95 % confidence intervals

RECPAM:

RECursive Partitioning and Amalgamation

ROC:

Receiver-operating characteristic

SD:

Standard deviation

SDMT:

Symbol Digit Modalities Test-Oral version

ST:

Stroop test

VFT:

Verbal Fluency Test

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Acknowledgments

This research was supported by European Community’s Seventh Framework Programme (FP7/2007-2013 under grant agreement 259867).

Conflicts of interest

The authors declare no financial or other conflicts of interest.

Ethical standard

The study has been approved by the Local Ethical Committee and has therefore been performed in accordance with the ethical standards laid down World Medical Association’s 2008 Declaration of Helsinki. All persons gave their informed consent prior to their inclusion in the study.

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Correspondence to Giancarlo Logroscino.

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Capozzo, R., Quaranta, V.N., Pellegrini, F. et al. Sniff nasal inspiratory pressure as a prognostic factor of tracheostomy or death in amyotrophic lateral sclerosis. J Neurol 262, 593–603 (2015). https://doi.org/10.1007/s00415-014-7613-3

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  • DOI: https://doi.org/10.1007/s00415-014-7613-3

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