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CompletedNCT04853940Updated Apr 5, 2022

Respiratory Muscle Function, Dyspnea, Exercise Capacity and Quality of Life in Severe COVID19 Patients

An observational study in Covid19, sponsored by Fundacion para la Investigacion Biomedica del Hospital Universitario Ramon y Cajal. Completed at 1 site in Spain. Open to participants aged 18 Years and older. Per ClinicalTrials.gov, last updated 2022-04-05.

Sponsored by Fundacion para la Investigacion Biomedica del Hospital Universitario Ramon y Cajal · Observational

Study type
Observational
Model
Cohort
Time perspective
Prospective
Enrollment
50
Ages
18 Years and older
Sex
All
01

Study summary

Further knowledge regarding sequelae in severe COVID-19 patients who have required ICU admission for invasive mechanical ventilation is still needed. Available evidence suggests ongoing respiratory impairment and impact in quality of life.

Read the detailed description

PURPOSE: To evaluate post-ICU clinical outcomes in severe COVID-19 ICU survivors.

DESIGN: A prospective observational study conducted in public hospital in Madrid, Spain.

METHODS:

Participants: patients diagnosed with severe COVID-19 who have survived ICU admission for invasive mechanical ventilation and have been discharged from hospital.

Intervention: Patients will be invited to attend follow-up visits at the hospital for assessments 3 months and 6 months after ICU discharge.

Outcome measures: Tests of respiratory muscles function will include ultrasonography of the diaphragm muscle to measure diaphragm thickness (DT), diaphragm thickening ratio (TR) and diaphragm excursion (DE); respiratory muscle strength measurement to obtain Maximal Inspiratory Pressure (MIP), Maximal Expiratory Pressure (MEP) and Maximal Sniff Nasal Inspiratory Pressure (SNIP); functional exercise capacity will be assessed with the Six Minutes Walk Test (6MWT); dyspnea and health-related quality of life will be evaluated with the Modified Medical Research Council Scale (mMRC Scale) and the Saint George's Respiratory Questionnaire (SGRQ). Data on participants' demographics and clinical data will also be collected.

Statistical Analysis: Descriptive statistics will be used to summarise data. Spearman's correlation coefficients will be used to explore associations between variables.

CONCLUSIONS AND SIGNIFICANCE OF THE RESEARCH: Understanding post-ICU clinical outcomes in patients with severe COVID-19 may help develop future prevention, therapeutic and follow-up strategies that improve quality of care and outcomes

02

Conditions studied

  • Covid19

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Keywords

  • COVID19
  • Diaphragm ultrasound
  • Respiratory muscle strength
  • Dyspnea
  • Exercise Capacity
  • Quality of life
  • Post-ICU outcomes
03

In context

COVID-19

7,640 studies on the registry are indexed under COVID-19; 488 are open to participants now.

This study's enrollment of 50 is below the median of 261 across 3,136 observational studies indexed under COVID-19.

Browse COVID-19 studies →

Lead sponsor

Fundacion para la Investigacion Biomedica del Hospital Universitario Ramon y Cajal is the lead sponsor of 82 studies on the registry; 21 are open to participants now.

Counted across the registry records on this site, refreshed daily.

04

Who can participate

Ages eligible
18 Years and older
Sexes eligible
All
Accepts healthy volunteers
No
Sampling method
Non-probability sample

Study population

Patients diagnosed with COVID19 pneumonia who are discharged from the Ramón y Cajal University Hospital ICU from 1 October 2020 to 28 February 2021 will be eligible for the study

Inclusion criteria

  • ⋧18 years old,
  • subjects diagnosed with COVID-19 confirmed by positive SARS-CoV-2 PCR testing who require admission to ICU for invasive mechanical ventilation
  • invasive ventilation > 24 hours.

Exclusion criteria

Exclusion Criteria:

  • pre-existing cognitive impairment,
  • communication/language barrier
  • any concurrent physical or mental health condition/ impairment that prevents subjects from taking part in evaluations or providing informed consent
  • loss of independent walking ability (with or without walking aids) prior to hospitalisation defined by a score of ≤2 on the mobility item of the modified Barthel Index,
  • pregnancy,
  • any injuries/surgery that requires medical bed rest.
05

Study design

Observational model
Cohort
Time perspective
Prospective
Enrollment
50 participants (actual)
Patient registry
No

Interventions

  • OtherData collection and clinical testing of subjects

    6-months follow-up with clinical testing at 3 and 6 months

06

What researchers measure

Primary outcomes

  1. Maximal Inspiratory Pressure (MIP) (centimetres of water, cmH20)

    It is the greater pressure which may be generated during maximal inspiration by the inspiratory muscles.

    Time frame: < 3 months after ICU discharge

  2. Maximal Inspiratory Pressure (MIP) (centimetres of water, cmH20)

    It is the greater pressure which may be generated during maximal inspiration by the inspiratory muscles.

    Time frame: within 6 months after ICU discharge

Secondary outcomes

  1. Diaphragm Thickening Ratio during deep breathing (centimetres)

    B-mode Diaphragm ultrasound will be performed to measure diaphragm thickening ratio during deep breathing. Diaphragm Thickening Ratio = Diaphragm Thickness at Functional Residual Capacity/ Diaphragm thickness at Total Lung Capacity.

    Time frame: within 3 months after ICU discharge

  2. Diaphragm Thickening Ratio during deep breathing (centimetres)

    B-mode Diaphragm ultrasound will be performed to measure diaphragm thickening ratio during deep breathing. Diaphragm Thickening Ratio = Diaphragm Thickness at Functional Residual Capacity/ Diaphragm thickness at Total Lung Capacity.

    Time frame: within 6 months after ICU discharge

  3. Diaphragm Thickening Ratio during quiet breathing (centimetres)

    B-mode Diaphragm ultrasound will be performed to measure diaphragm thickening ratio at Tidal Volume. Diaphragm Thickening Ratio = Diaphragm Thickness at the end of a quiet expiration/ Diaphragm thickness at the end of a quiet inspiration.

    Time frame: within 3 months after ICU discharge

  4. Diaphragm Thickening Ratio during quiet breathing (centimetres)

    B-mode Diaphragm ultrasound will be performed to measure diaphragm thickening ratio at Tidal Volume. Diaphragm Thickening Ratio = Diaphragm Thickness at the end of a quiet expiration/ Diaphragm thickness at the end of a quiet inspiration.

    Time frame: within 6 months after ICU discharge

  5. Diaphragm Excursion during deep breathing (centimetres)

    M-mode Diaphragm Ultrasound imaging will be performed to measure diaphragm excursion during deep breathing defined as the displacement (centimetres) of the diaphragm between Functional Residual Capacity and Total Lung Capacity

    Time frame: within 3 months after ICU discharge

  6. Diaphragm Excursion during deep breathing (centimetres)

    M-mode Diaphragm Ultrasound imaging will be performed to measure diaphragm excursion during deep breathing defined as the displacement (centimetres) of the diaphragm between Functional Residual Capacity and Total Lung Capacity.

    Time frame: within 6 months after ICU discharge

  7. Maximal Expiratory Pressure (MEP) (cmH20)

    It is the greater pressure which may be generated during maximal expiration by the inspiratory muscles.

    Time frame: within 3 months after ICU discharge

  8. Maximal Expiratory Pressure (MEP) (cmH20)

    It is the greater pressure which may be generated during maximal expiration by the inspiratory muscles.

    Time frame: within 6 months after ICU discharge

  9. Modified Medical Research Council (mMRC) Dyspnea score

    Dyspnea will be measured with the mMRC Dyspnea scale (range: 0-4, higher values indicating higher level of dyspnea)

    Time frame: within 3 months following ICU discharge

  10. Modified Medical Research Council (mMRC) Dyspnea score

    Dyspnea will be measured with the mMRC Dyspnea scale (range: 0-4, higher values indicating higher level of dyspnea)

    Time frame: within 6 months following ICU discharge

  11. 6-Minutes Walk Test (6MWT) (metres)

    The 6MWT will be used to measure exercise capacity

    Time frame: within 3 months following ICU discharge

  12. 6-Minutes Walk Test (6MWT) (metres)

    The 6MWT will be used to measure exercise capacity

    Time frame: within 6 months following ICU discharge

  13. Saint George's Respiratory Questionnaire (SGRQ) score

    The SGRQ is used to measure health-related quality of life (range: 0-100, higher scores represent higher impairment in quality of life)

    Time frame: within 3 months following ICU dischargemonths following ICU discharge

  14. Saint George's Respiratory Questionnaire (SGRQ) score

    The SGRQ is used to measure health-related quality of life (range: 0-100, higher scores represent higher impairment in quality of life)

    Time frame: within 6 months following ICU dischargemonths following ICU discharge

07

Study locations

1 site
  • ICU. Ramón y Cajal University Hospital
    Madrid, 28034, Spain
08

References and documents

Individual participant data

Plan to share: Undecided

No publications or documents are linked to this record.

09

Updates

Tracking since Sep 25, 2026
No changes since tracking began. The registry record was last updated on Apr 5, 2022, before this site started recording changes on Sep 25, 2026. Its history is on ClinicalTrials.gov ↗
10

Registry details

Key details

Study ID
NCT04853940
Lead sponsor
Fundacion para la Investigacion Biomedica del Hospital Universitario Ramon y Cajal
Responsible party
Maria Natividad Seisdedos Nunez (Senior Physiotherapist, MSc, Fundacion para la Investigacion Biomedica del Hospital Universitario Ramon y Cajal) — Principal investigator
First posted
Apr 22, 2021
Start date
Jan 1, 2021
Primary completion
Nov 30, 2021
Completion
Jan 1, 2022
Last update
Apr 5, 2022

Study contacts

Luís López-González, BSc,MSc
principal investigator · Fundación Ramón y Cajal
View the source record on ClinicalTrials.gov ↗

Not currently enrolling

This study is completed, as verified in Mar 2022. You cannot join it, but the record below documents what was studied.

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