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Blood Viscosity in COVID-19 Patients With Sudden Deafness
Francisco Javier García-Callejo1, Ramón Balaguer-García1, María Dolores Lis-Sancerni2
1Servicio de ORL, Hospital General de Requena, Valencia, Spain.
Acta Otorrinolaringologica Espanola
|April 10, 2022
Summary
Sudden deafness (SD) in COVID-19 patients may be linked to elevated blood viscosity (BV). Higher BV levels were observed in patients with sudden deafness, particularly those in intensive care units (ICUs).
Area of Science:
- Otorhinolaryngology
- Infectious Diseases
- Hematology
Background:
- Blood viscoelastic properties are implicated in severe COVID-19 complications and Sudden Deafness (SD).
- This study investigates a potential correlation between SARS-CoV-2 infection and SD.
Purpose of the Study:
- To determine if Sudden Deafness (SD) in patients admitted for SARS-CoV-2 infection correlates with blood viscosity (BV).
Main Methods:
- Prospective follow-up of COVID-19 patients monitoring blood viscosity (BV) at high shear rate (300 s⁻¹).
- Periodic inquiry for hearing loss and audiometric evaluation.
- BV measurements were also taken for non-infected SD cases (2019-2020) and healthy controls.
Main Results:
- 9 cases of SD were detected among 330 COVID-19 patients, all from the ICU group.
- Mean BV was significantly higher in patients with SD (4.85 ± 0.52 cps) compared to non-ICU (4.38 ± 0.43 cps) and ICU without SD (4.53 ± 0.39 cps) groups.
- Highest BV elevations in SD cases occurred between days 6-10 of hospital admission; non-infected SD cases had normal BV.
Conclusions:
- COVID-19 patients can exhibit high blood viscosity (BV) and Sudden Deafness (SD).
- The incidence of hearing damage in critical COVID-19 patients is considerable.
- Further research with larger sample sizes and inpatient controls is needed to confirm hyperviscosity predisposition.
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