Associations between entire blood viscosity and SARS-CoV-2-linked loss of life
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In a current examine revealed within the Journal of the American College of Cardiology, researchers depicted the hyperlink between coronavirus illness 2019 (COVID-19)-associated mortality and entire blood viscosity (WBV).

Study: Association of Blood Viscosity With Mortality Among Patients Hospitalized With COVID-19. Image Credit: giggsy25/Shutterstock


Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), a betaCoV, is liable for the continuing COVID-19 pandemic. Unlike different betaCoVs, COVID-19 options hypercoagulability, which considerably raises the chance of mortality and morbidity.

Although SARS-CoV-2 an infection was recognized primarily as a respiratory situation, mounting proof characterised COVID-19 by aberrant blood rheology, a dysregulated immune response, and thrombotic problems. A clinically verified indicator of blood rheology and a acknowledged determinant of cardiovascular threat is WBV.

According to present stories on COVID-19 sufferers, WBV ranges considerably heighten in the course of the acute and restoration phases of the sickness. Elevated plasma viscosity, a essential factor of WBV, has additionally been linked to worse outcomes and thrombotic occasions in lots of research involving acute COVID-19 sufferers.

About the examine

The current multihospital retrospective cohort analysis aimed to determine the connection between estimated BV (eBV) and loss of life in hospital-admitted SARS-CoV-2 sufferers. The authors speculate that larger WBV was linked to loss of life in hospitalized COVID-19 sufferers. They sought to discover the prognostic usefulness of eBV that might predict all-cause fatality throughout hospitalized COVID-19 sufferers.

The analysis volunteers included 5,621 hospital-admitted COVID-19 sufferers from the Mount Sinai Health System between 27 February 2020 and 27 November 2021. Further, eBV was decided using the Walburn-Schneck mannequin. To assess the correlation between eBV and loss of life, multivariate Cox proportional hazards fashions have been utilized. Sex, age, race, metabolic and cardiovascular comorbidities, baseline inflammatory biomarkers, and in-house pharmacotherapy have been all thought-about variables.


The authors found that heightened estimated low-shear BV (eLSBV) and estimated high-shear BV (eHSBV) have been related to elevated in-hospital loss of life amongst 5,621 hospitalized acute COVID-19 sufferers.

The enhance in mortality related threat per 1-centipoise (cP) in eHSBV corresponded to a 36% larger loss of life threat. Likewise, the chance of loss of life elevated by 7% with each 1-cP enhance in eLSBV. Consistent relationships between excessive eBV and loss of life have been noticed in all subsets of intercourse, age, metabolic or cardiovascular comorbidities, in-house pharmacotherapy (statins and heparins), and inflammatory laboratory marker ranges.

In fashions that managed for C-reactive protein (CRP), interleukin 6 (IL-6), D-dimer, and different biomarkers ceaselessly used for threat classification of hospitalized COVID-19 sufferers, the staff discovered that BV predicted mortality. Participants within the higher quartiles of eHSBV exhibited an adjusted hazard ratio (aHR) of 1.50 even after adjusting for the degrees of IL-6 and CRP, which have been linked to larger mortality.

The scientists didn’t discover a related correlation between WBV and COVID-19-linked mortality within the Asian inhabitants. With solely 6% of COVID-19 sufferers hospitalized within the examine coming from an Asian background, there could also be a scarcity of sufficient occurrences to detect a statistical discrepancy. Furthermore, the researchers speculate that Asians might have innate protection pathways towards the influence of blood hyperviscosity provided that they’d the bottom charge of thromboembolic illness.


The scientists claimed that the present analysis was the primary multicenter, intensive examine to look at the prognostic significance of WBV for predicting all-cause loss of life amongst hospitalized COVID-19 sufferers. According to the authors, only one prior examine, a longitudinal potential population-based investigation, has appeared into the connection between WBV and loss of life.

The examine findings illustrated that amongst hospitalized SARS-CoV-2 sufferers, eHSBV and eLSBV have been linked to larger in-hospital mortality charges. In the examine, elevated eLSBV and eHSBV have been linked to an elevation in inpatient COVID-19 mortality. Nonetheless, after accounting for inflammatory biomarkers similar to IL-6, the affiliation between eLSBV and mortality was now not statically related.

Likewise, high-shear viscosity was linked extra intently to the loss of life, with a 1-cP rise in eHSBV mirroring a 36% larger chance of mortality relative to eLSBV’s 7%. The staff famous that future analysis on the pathologic processes and variations of high- and low-shear blood hyperviscosity within the context of COVID-19 could be crucial.

Nevertheless, the connection between eBV and mortality endured throughout completely different subgroups, significantly in sufferers with out comorbid circumstances. Besides, the authors emphasised the need of additional research inspecting the affect of racial disparities on the medical outcomes of COVID-19.

Together, the present examine depicted that larger mortality amongst hospitalized SARS-CoV-2 sufferers was correlated considerably with elevated eBV. As a consequence, eBV might predict affected person outcomes in COVID-19’s early phases. The findings additionally highlighted the necessity to think about potential future therapies that goal to decrease WBV.

Journal reference:

  • Daein Choi, Ori Waksman, Aleesha Shaik, Phyu Mar, Qinzhong Chen, Daniel J. Cho, HyoungSup Kim, Robin L. Smith, Sascha N. Goonewardena, Robert S. Rosenson. (2022). Association of Blood Viscosity With Mortality Among Patients Hospitalized With COVID-19. Journal of the American College of Cardiologydoi:

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