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Nocturnal PtcCO2 Monitoring in Patients With Amyotrophic Lateral Sclerosis (ALS)

This study has been completed.
Information provided by (Responsible Party):
DELRIEU Jacqueline, Association Nationale pour les Traitements A Domicile, les Innovations et la Recherche Identifier:
First received: April 9, 2009
Last updated: January 25, 2017
Last verified: January 2017

Amyotrophic lateral sclerosis (ALS) is a neurodegenerative disease affecting motoneurons, with a prevalence around 5/100.000. Respiratory muscle involvement is a major feature in ALS and remains the main prognostic factor. Timing and rate of progression of this respiratory muscle involvement is also highly variable among individuals.

Respiratory manifestations justify a careful follow up including clinical evaluation, pulmonary function tests and blood gases. Prognostic value of respiratory muscle assessment has been clearly demonstrated in ALS, although several cut off values have been published. The clinical benefit of non invasive ventilation (NIV) is well established in ALS, but the optimal criteria for its initiation remain debated .

The 1999 consensus for NIV selected classical criteria to consider NIV in patients with respiratory symptoms suggesting hypoventilation: daytime hypercapnia (PaCO2 > 45 mmHg), nocturnal SaO2 < 89 % more than 5 consecutive minutes and for progressive neuromuscular disorders (NMD) (mainly ALS), a vital capacity (VC) < 50 % pred or a PImax < 60 cmH2O.

Besides daytime clinical and PFT assessment, nocturnal evaluation is essential in ALS. The prevalence of sleep apnea ranges from 16 % to 76 %.

Transcutaneous PCO2 (tcPCO2) is an attractive technique to evaluate non invasively nocturnal hypoventilation. The technique is well validated in different settings. Its use in neuromuscular disorders (NMD) is recent. In particular one study has demonstrated a high predictive value of tcPCO2 for the development of daytime hypoventilation within 1 year. To our knowledge, this technique has not been specifically assessed in ALS. There is a potential role for nocturnal PtcCO2 monitoring in the close follow up of ALS patients. Indeed, a close respiratory follow up of ALS patients is essential to determine the optimal timing of NIV, avoiding the occurence of unexpected acute respiratory failure.

Condition Intervention
Amyotrophic Lateral Sclerosis
Device: PtcCO2

Study Type: Interventional
Study Design: Intervention Model: Single Group Assignment
Masking: No masking
Primary Purpose: Prevention
Official Title: Potential Role for Nocturnal PtcCO2 Monitoring in the Close Follow up of ALS Patients.

Resource links provided by NLM:

Further study details as provided by Association Nationale pour les Traitements A Domicile, les Innovations et la Recherche:

Primary Outcome Measures:
  • Nocturnal Transcutaneous PCO2 [ Time Frame: 6 months ]

Secondary Outcome Measures:
  • Pulmonary function [ Time Frame: 6 months ]

Enrollment: 66
Study Start Date: April 2009
Study Completion Date: January 2017
Primary Completion Date: June 2014 (Final data collection date for primary outcome measure)
Arms Assigned Interventions
Experimental: PtcCO2 Device: PtcCO2
Nocturnal assessment will be performed during the initial polysomnography (and at 6 months) with a combined PtcCO2/pulse oxymetry TOSCA500 Radiometer monitoring evaluating different physiological parameters.


Ages Eligible for Study:   18 Years to 75 Years   (Adult, Senior)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No

Inclusion Criteria:

  • Amyotrophic lateral sclerosis :definite, probable or probable with EMG (Airlie House Criteria, 1998).
  • Forced vital capacity >70% pred.
  • Daytime PaCO2 <43 mmHg.
  • Venous HCO3- <28 mmol/L

Exclusion Criteria:

  • Patients unable to perform pulmonary function tests or nocturnal recordings.
  • Coexisting significant lung disease: moderate to severe asthma or COPD
  • Current NIV, CPAP or oxygen therapy.
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Please refer to this study by its identifier: NCT00879593

Lille, France, 59037
Pôle des maladies respiratoires et service EFR- Centre hospitalier Regional Universitaire
Lille, France
Sponsors and Collaborators
Association Nationale pour les Traitements A Domicile, les Innovations et la Recherche
Principal Investigator: Thierry PEREZ, MD CHRU LILLE
  More Information

Responsible Party: DELRIEU Jacqueline, PhD, Association Nationale pour les Traitements A Domicile, les Innovations et la Recherche Identifier: NCT00879593     History of Changes
Other Study ID Numbers: ANTADIR PTcCO2/SLA
Study First Received: April 9, 2009
Last Updated: January 25, 2017

Additional relevant MeSH terms:
Motor Neuron Disease
Amyotrophic Lateral Sclerosis
Pathologic Processes
Neurodegenerative Diseases
Nervous System Diseases
Neuromuscular Diseases
Spinal Cord Diseases
Central Nervous System Diseases
TDP-43 Proteinopathies
Proteostasis Deficiencies
Metabolic Diseases processed this record on May 22, 2017