Long-COVID is Associated with Impaired Red Blood Cell Function

Area of Science:

• Hematology
• Infectious Diseases
• Pulmonology

Background:

• COVID-19, caused by SARS-CoV-2, can lead to long-term symptoms in 10-35% of patients.
• Red blood cell precursors are a target of SARS-CoV-2, suggesting dysregulation in hemoglobin and iron metabolism.
• Understanding Long-COVID's hematological impact is crucial for patient recovery.

Purpose of the Study:

• To investigate differences in blood gas and hematological parameters between healthy individuals and Long-COVID patients.
• To explore the link between SARS-CoV-2 infection and erythrocyte functionality.
• To identify potential mechanisms behind Long-COVID symptoms like fatigue and dyspnea.

Main Methods:

• Comparative analysis of clinical blood gas and hematological parameters.
• Inclusion of over 20 healthy donors and Long-COVID patients.
• Focus on parameters like oxygen and carbon monoxide binding, iron levels, and lymphocyte counts.

Main Results:

• Long-COVID patients showed impaired oxygen binding to hemoglobin and increased carbon monoxide binding.
• Decreased plasma iron and transferrin saturation were observed, with elevated mean corpuscular hemoglobin.
• Lower base excess, bicarbonate, and lymphocyte levels were noted in Long-COVID patients.

Conclusions:

• Data suggest impaired erythrocyte functionality in Long-COVID patients, causing diminished oxygen supply.
• This erythrocyte dysfunction may contribute to Chronic Fatigue Syndrome (CFS), dyspnea, and anemia.
• Further research is needed to elucidate the underlying pathomechanisms of these Long-COVID-related hematological changes.