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Journal Information
Vol. 73. Issue 2.
Pages 104-112 (March - April 2022)
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Vol. 73. Issue 2.
Pages 104-112 (March - April 2022)
Original Article
Blood Viscosity in COVID-19 Patients With Sudden Deafness
Viscosidad sanguínea en pacientes COVID-19 con sordera súbita
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Francisco Javier García-Callejoa,
Corresponding author
otorrinolaringologo65@gmail.com

Corresponding author.
, Ramón Balaguer-Garcíaa, María Dolores Lis-Sancernib, Luis Ruescas-Gómezc, Marta Murcia-Lópezb
a Servicio de ORL, Hospital General de Requena, Valencia, Spain
b Medicina Familiar y Comunitaria, Hospital General de Requena, Valencia, Spain
c Servicio de Urgencias, Hospital General de Requena, Valencia, Spain
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Figures (2)
Tables (3)
Table 1. 2019 SEORL Criteria on Hearing Improvement in SD, Considering the Degree of Recovery by the Average Hearing Threshold From 250 to 8000 Hz in the Second LTA Within 30 Days of the First LTA.
Table 2. Characteristics of the Patients Hospitalised for COVID-19 and Grouped Into the 3 Cohorts Considered (*P < .001).
Table 3. Threshold Drop in the First LTA Broken Down by Frequency and Mean Value of TBV at SR at 300 s−1 for Each Case With SD. Cases 1–9 Are Admissions With COVID-19. Cases 10 and 11 Are Uninfected Outpatients in 2020. Cases 12–15 Are Cases Detected in 2019.
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Abstract
Background

Changes in blood viscoelastic properties have been proposed previosuly as etiopathogenesis for severe complications in COVID-19 and some cases of Sudden Deafness (SD). This is an attempt to verify if SD cases in patients admitted for SARS-Cov-2 infection can be correlated.

Patients and methods

A prospective follow-up was carried out with COVID-19 patients, monitoring their blood viscosity (BV) at high shear rate (300 s−1) and inquiring them periodically for eventual hearing loss. This measurement was extended to cases bearing of SD in 2019 and 2020 without infection and a control group of healthy normoacoustic subjects.

Results

The normality range was 4,16 ± 0,62 cps. 330 cases admitted for COVID-19 were evaluated from February 24th, 2020 to March 24th, 2021, 85 of them attended in ICU. After anamnesis and Audiometric Tone Thresholds developed as soon as possible, 9 SD were detected, all belonging to ICU group. The mean BV was 4,38 ± 0,43 cps in the ward group, 4,53 ± 0,39 cps in the ICU patients without SD, and 4,85 ± 0,52 cps in the cases with SD, with statistically significant differences. Highest BV elevations in the SD cases were detected between days 6 and 10 of hospital admission. In 2019 four cases consulted with SD, and another two did it in 2020 without a diagnosis of COVID-19, with normal BV values.

Conclusions

During SARS-Cov-2 infection, patients may show high BV and SS, although an inpatients control group and a larger sample volume are necessary to confirm the predisposition to hyperviscosity. The incidence of hearing damage is considerable if its possible appearance is taken into account, within the limitations of critical patients with COVID-19.

Keywords:
Sudden deafness
COVID-19
Blood viscosity
SARS-Cov-2
Sensorineural hearingloss
Resumen
Antecedentes

La alteración en las propiedades viscoelásticas de la sangre ha sido anteriormente propuesta como etiopatogenia de complicaciones severas por COVID-19 y algunos casos de Sordera Súbita (SS). Pretendemos verificar si la aparición de casos de SSI en pacientes ingresados por infección por SARS-Cov-2 puede correlacionarse de este modo.

Pacientes y metodos

Estudio longitudinal prospectivo de pacientes ingresados en nuestro Centro por COVID-19, efectuando monitorización de la viscosidad sanguínea (VS) a alta velocidad de cizallamiento (300 seg−1) y un requerimiento periódico personal sobre hipoacusia. Esta determinación se extendió a casos atendidos por SS sin infección en 2019 y 2020 y un grupo control de sujetos sanos normoacúsicos.

Resultados

El rango de normalidad se situó en 4,16 ± 0,62 cps. Entre el 24 de Febrero de 2020 y el 24 de Marzo de 2021 se evaluaron 330 casos ingresados por COVID-19, 85 asistidos en UCI. Fueron identificadas tras anamnesis y ATL todo lo inmediata que el status clínico lo permitió hasta 9 casos con SS, todos pertenecientes al grupo de UCI. La VS media fue 4,38 ± 0,43 cps en el grupo de sala, 4,53 ± 0,39 cps en los pacientes en UCI sin SS, y 4,85 ± 0,52 cps en los casos con SS, con diferencias estadísticamente significativas. Las mayores elevaciones de la VS en los casos con SS se detectaron entre los días 6 y 10 del ingreso hospitalario. En 2019 consultaron 4 casos, y otros 2 en 2020 sin diagnóstico de COVID-19, con valores normales de VS.

Conclusiones

Durante la infección por SARS-Cov-2 los pacientes pueden presentar elevación en la VS y SS, si bien se hacen necesarios un grupo control hospitalario y un volumen muestral mayor para confirmar la predisposición a la hiperviscosidad. La incidencia del daño auditivo resulta considerable si se tiene en cuenta su posible aparición en pacientes críticos con COVID-19.

Palabras-clave:
Sordera súbita
COVID-19
Viscosidad sanguínea
SARS-Cov-2
Hipoacusia neurosensorial

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