Respiratory Muscle Assesment in COVID-patients Without Hospitalization

Study Results

Results pending

The study team has not published outcome measurements, participant flow, or safety data for this trial yet. Check back later for updates.

Basic Information

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Recruitment Status

COMPLETED

Total Enrollment

25 participants

Study Classification

OBSERVATIONAL

Study Start Date

2024-12-01

Study Completion Date

2024-12-01

Brief Summary

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Fatigue and exercise intolerance after survived COVID-19-infection might be related to weakness of the respiratory muscles. The aim of the project is to measure respiratory muscle function and strength in our respiratory physiology laboratory in patients who were not hospitalized during the acute COVID-19-infection but still complain of different persistent symptoms including exertional dyspnea and fatigue.

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Detailed Description

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Since the beginning of the COVID pandemic, more and more recovered patients have a number of persistent symptoms including exertional dyspnea and fatigue even months after recovering from acute coronavirus disease 2019 (COVID-19). These symptoms often cannot be explained because routine clinical diagnoses, including extensive cardiac and pulmonary examinations, do not reveal any relevant abnormalities.

In our previous study (Regmi et al) with 50 patients formerly hospitalized due to acute COVID-19 infection, it was shown that diaphragm muscle weakness contributes to persistent exertional dyspnea about one year after hospitalization for COVID-19, regardless of mechanical ventilation. Additionally, the severity of exertional dyspnea correlated with the extent of diaphragmatic weakness.

Since laboratory findings, pulmonary function tests and cardiological routine examinations did not reveal any significant impairments, this was the first time that a potential pathophysiological correlate is objectively associated with dyspnea in long COVID-19 syndrome. The results of our study were clinically relevant because the persistent symptom burden in patients after surviving COVID-19 infection remains very high. In addition diaphragm training presents itself as a potential therapeutic target, since in other diseases such as COPD, such training has been shown to improve the symptoms. Therefore, the investigators believe that the results provide important perspectives, both for the pathophysiological understanding and for the potential treatment of persistent exertional dyspnea in patients.

However, a considerable gap exists here: a significant number of patients who suffer from an acute COVID-19 infection but do not have a severe course during the initial infection, so that hospitalization is not necessary, still complain of different persistent symptoms. Here, too, despite an extensive cardiopulmonary work-up, there is a lack of a sufficient explanation of the lasting complaints. It is precisely in these patients that a possible role of diaphragmatic weakness on the symptoms is yet to be investigated using already established gold standard techniques.

Conditions

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Diaphragm Injury Covid19

Study Design

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Observational Model Type

COHORT

Study Time Perspective

PROSPECTIVE

Interventions

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Comprehensive assessment of respiratory muscle function.

Comprehensive assessment of respiratory muscle function to the point of its invasive assessment with recordings of twitch transdiaphragmatic pressure in response to magnetic phrenic nerve stimulation and stimulation of the lower thoracic nerve roots.

Intervention Type DIAGNOSTIC_TEST

Eligibility Criteria

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Inclusion Criteria

* Patients with COVID-19 infection without hospitalization during the acute infection (n=25)
* Patients aged at least 18 years, who are mentally and physically able to consent and participate into the study

Exclusion Criteria

* Clinically pre-established cardiovascular disease or other pulmonary diseases which might lead to exertional dyspnea (systolic heart failure, COPD).
* Body-mass-index (BMI) \>40
* Expected absence of active participation of the patient in study-related measurements
* Alcohol or drug abuse
* Metal implant in the body that is not MRI compatible (NON MRI compatible pacemaker, implantable defibrillator, cervical implants, e.g. brain pacemakers etc.)
* Slipped disc
* Epilepsy
* Bound to a wheel chair

Minimum Eligible Age

18 Years

Maximum Eligible Age

75 Years

Eligible Sex

ALL

Accepts Healthy Volunteers

No