Related Experiment Videos
Respiratory muscle dysfunction associated with human immunodeficiency virus infection
L Schulz1, H N Nagaraja, N Rague
1Department of Internal Medicine, College of Medicine, Ohio State University, Columbus, USA.
Summary
Human immunodeficiency virus (HIV) infection is linked to weakened respiratory muscles, impacting breathing capacity. This study found HIV+ individuals exhibit reduced inspiratory and expiratory pressures, contributing to breathlessness.
Area of Science:
- Pulmonary Medicine
- Infectious Diseases
- Respiratory Physiology
Background:
- Skeletal muscle abnormalities are known in human immunodeficiency virus (HIV) infection.
- The impact of HIV on respiratory muscle function remains poorly understood.
- Unexplained dyspnea is a common symptom in HIV-positive individuals.
Purpose of the Study:
- To investigate respiratory muscle strength and endurance in HIV-positive individuals.
- To determine if respiratory muscle dysfunction contributes to dyspnea in HIV.
- To compare respiratory muscle function between HIV-positive and HIV-negative males.
Main Methods:
- Maximal inspiratory pressure (MIP) and maximal expiratory pressure (MEP) were measured.
- Inspiratory muscle endurance was assessed using an incremental threshold loading (ITL) protocol.
- 23 HIV-positive outpatients and 14 HIV-negative controls were studied.
Main Results:
- HIV-positive subjects showed significantly lower mean MIP and MEP compared to controls.
- Respiratory muscle endurance, measured by load at task failure during ITL, was reduced in the HIV-positive group.
- No correlation was found between respiratory muscle performance and CD4+ count or azidothymidine (AZT) use.
Conclusions:
- HIV seropositivity is associated with impaired respiratory muscle performance.
- Respiratory muscle dysfunction may be a contributing factor to dyspnea in HIV patients.
- Further research is warranted to explore interventions for respiratory muscle weakness in HIV.