Sublingual microcirculation does not reflect red blood cell transfusion thresholds in the intensive care unit-a prospective observational study in the intensive care unit

Purpose Hemoglobin (Hb) transfusion thresholds are established in intensive care units. A restrictive transfusion threshold (Hb 70-75 g/l) is recommended in septic patients, and a liberal transfusion threshold (Hb 90 g/l) for cardiogenic shock. It is unclear whether these historically adopted transf...

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Veröffentlicht in:Critical care (London, England) England), 2020-01, Vol.24 (1), p.18-18, Article 18
Hauptverfasser: Scheuzger, Jonas, Zehnder, Anna, Meier, Vera, Yeginsoy, Desiree, Flukiger, Julian, Siegemund, Martin
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container_issue 1
container_start_page 18
container_title Critical care (London, England)
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creator Scheuzger, Jonas
Zehnder, Anna
Meier, Vera
Yeginsoy, Desiree
Flukiger, Julian
Siegemund, Martin
description Purpose Hemoglobin (Hb) transfusion thresholds are established in intensive care units. A restrictive transfusion threshold (Hb 70-75 g/l) is recommended in septic patients, and a liberal transfusion threshold (Hb 90 g/l) for cardiogenic shock. It is unclear whether these historically adopted transfusion thresholds meet the challenges of individual patients. Methods We evaluated microvascular flow index (MFI) and proportion of perfused vessels (PPV) in the sublingual microcirculation with CytoCam-IDF microscopy and near-infrared spectroscopy (NIRS). A study team-independent, treating intensivist assigned a total of 64 patients to 1 of 2 two transfusion thresholds, 43 patients to the Hb 75 g/l threshold and 21 patients to the Hb 90 g/l threshold, at a surgical intensive care unit. We performed microcirculatory measurements 1 h before and 1 h after transfusion of 1 unit of red blood cells. Results Microcirculatory flow variables correlated negatively with pre-transfusion flow variables (Delta MFI: rho = - 0.821, p < 0.001; Delta PPV: rho = - 0.778, p < 0.001). Patients with good initial microcirculation (cutoffs: MFI > 2.84, PPV > 88%) showed a deteriorated microcirculation after red blood cell transfusion. An impaired microcirculation improved after transfusion. At both transfusion thresholds, approximately one third of the patients showed an initially impaired microcirculation. In contrast, one third in every group had good microcirculation above the cutoff variables and did not profit from the transfusion. Conclusion The data suggest that the established transfusion thresholds and other hemodynamic variables do not reflect microcirculatory perfusion of patients. Blood transfusion at both thresholds 75 g/l and 90 g/l hemoglobin can either improve or harm the microcirculatory blood flow, questioning the concept of arbitrary transfusion thresholds.
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A restrictive transfusion threshold (Hb 70-75 g/l) is recommended in septic patients, and a liberal transfusion threshold (Hb 90 g/l) for cardiogenic shock. It is unclear whether these historically adopted transfusion thresholds meet the challenges of individual patients. Methods We evaluated microvascular flow index (MFI) and proportion of perfused vessels (PPV) in the sublingual microcirculation with CytoCam-IDF microscopy and near-infrared spectroscopy (NIRS). A study team-independent, treating intensivist assigned a total of 64 patients to 1 of 2 two transfusion thresholds, 43 patients to the Hb 75 g/l threshold and 21 patients to the Hb 90 g/l threshold, at a surgical intensive care unit. We performed microcirculatory measurements 1 h before and 1 h after transfusion of 1 unit of red blood cells. Results Microcirculatory flow variables correlated negatively with pre-transfusion flow variables (Delta MFI: rho = - 0.821, p &lt; 0.001; Delta PPV: rho = - 0.778, p &lt; 0.001). Patients with good initial microcirculation (cutoffs: MFI &gt; 2.84, PPV &gt; 88%) showed a deteriorated microcirculation after red blood cell transfusion. An impaired microcirculation improved after transfusion. At both transfusion thresholds, approximately one third of the patients showed an initially impaired microcirculation. In contrast, one third in every group had good microcirculation above the cutoff variables and did not profit from the transfusion. Conclusion The data suggest that the established transfusion thresholds and other hemodynamic variables do not reflect microcirculatory perfusion of patients. Blood transfusion at both thresholds 75 g/l and 90 g/l hemoglobin can either improve or harm the microcirculatory blood flow, questioning the concept of arbitrary transfusion thresholds.</description><identifier>ISSN: 1466-609X</identifier><identifier>ISSN: 1364-8535</identifier><identifier>EISSN: 1364-8535</identifier><identifier>EISSN: 1466-609X</identifier><identifier>EISSN: 1366-609X</identifier><identifier>DOI: 10.1186/s13054-020-2728-7</identifier><identifier>PMID: 31952555</identifier><language>eng</language><publisher>LONDON: Springer Nature</publisher><subject>Aged ; Blood ; Blood flow ; Blood transfusion ; Capillary density ; Cardiogenic shock ; Critical Care Medicine ; Critical illness ; Diseases ; Erythrocyte Transfusion - classification ; Erythrocyte Transfusion - methods ; Erythrocyte Transfusion - trends ; Female ; General &amp; Internal Medicine ; Glycosylated hemoglobin ; Health aspects ; Hemoglobins ; Humans ; Infrared spectroscopy ; Intensive care ; Intensive care unit ; Intensive Care Units - organization &amp; administration ; Intensive Care Units - statistics &amp; numerical data ; Investigations ; Life Sciences &amp; Biomedicine ; Male ; Measurement ; Microcirculation ; Microcirculation - physiology ; Microscopy ; Middle Aged ; Mortality ; Mouth Floor - blood supply ; Mouth Floor - physiopathology ; Observational studies ; Patient outcomes ; Pay-per-view television ; Physiological aspects ; Prospective Studies ; Science &amp; Technology ; Shock ; Spectroscopy ; Spectroscopy, Near-Infrared - methods ; Sublingual microcirculation ; Transfusion ; Transfusion Medicine - methods ; Transfusion Medicine - standards ; Vessel perfusion</subject><ispartof>Critical care (London, England), 2020-01, Vol.24 (1), p.18-18, Article 18</ispartof><rights>COPYRIGHT 2020 BioMed Central Ltd.</rights><rights>2020. 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A restrictive transfusion threshold (Hb 70-75 g/l) is recommended in septic patients, and a liberal transfusion threshold (Hb 90 g/l) for cardiogenic shock. It is unclear whether these historically adopted transfusion thresholds meet the challenges of individual patients. Methods We evaluated microvascular flow index (MFI) and proportion of perfused vessels (PPV) in the sublingual microcirculation with CytoCam-IDF microscopy and near-infrared spectroscopy (NIRS). A study team-independent, treating intensivist assigned a total of 64 patients to 1 of 2 two transfusion thresholds, 43 patients to the Hb 75 g/l threshold and 21 patients to the Hb 90 g/l threshold, at a surgical intensive care unit. We performed microcirculatory measurements 1 h before and 1 h after transfusion of 1 unit of red blood cells. Results Microcirculatory flow variables correlated negatively with pre-transfusion flow variables (Delta MFI: rho = - 0.821, p &lt; 0.001; Delta PPV: rho = - 0.778, p &lt; 0.001). Patients with good initial microcirculation (cutoffs: MFI &gt; 2.84, PPV &gt; 88%) showed a deteriorated microcirculation after red blood cell transfusion. An impaired microcirculation improved after transfusion. At both transfusion thresholds, approximately one third of the patients showed an initially impaired microcirculation. In contrast, one third in every group had good microcirculation above the cutoff variables and did not profit from the transfusion. Conclusion The data suggest that the established transfusion thresholds and other hemodynamic variables do not reflect microcirculatory perfusion of patients. Blood transfusion at both thresholds 75 g/l and 90 g/l hemoglobin can either improve or harm the microcirculatory blood flow, questioning the concept of arbitrary transfusion thresholds.</description><subject>Aged</subject><subject>Blood</subject><subject>Blood flow</subject><subject>Blood transfusion</subject><subject>Capillary density</subject><subject>Cardiogenic shock</subject><subject>Critical Care Medicine</subject><subject>Critical illness</subject><subject>Diseases</subject><subject>Erythrocyte Transfusion - classification</subject><subject>Erythrocyte Transfusion - methods</subject><subject>Erythrocyte Transfusion - trends</subject><subject>Female</subject><subject>General &amp; Internal Medicine</subject><subject>Glycosylated hemoglobin</subject><subject>Health aspects</subject><subject>Hemoglobins</subject><subject>Humans</subject><subject>Infrared spectroscopy</subject><subject>Intensive care</subject><subject>Intensive care unit</subject><subject>Intensive Care Units - organization &amp; 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A restrictive transfusion threshold (Hb 70-75 g/l) is recommended in septic patients, and a liberal transfusion threshold (Hb 90 g/l) for cardiogenic shock. It is unclear whether these historically adopted transfusion thresholds meet the challenges of individual patients. Methods We evaluated microvascular flow index (MFI) and proportion of perfused vessels (PPV) in the sublingual microcirculation with CytoCam-IDF microscopy and near-infrared spectroscopy (NIRS). A study team-independent, treating intensivist assigned a total of 64 patients to 1 of 2 two transfusion thresholds, 43 patients to the Hb 75 g/l threshold and 21 patients to the Hb 90 g/l threshold, at a surgical intensive care unit. We performed microcirculatory measurements 1 h before and 1 h after transfusion of 1 unit of red blood cells. Results Microcirculatory flow variables correlated negatively with pre-transfusion flow variables (Delta MFI: rho = - 0.821, p &lt; 0.001; Delta PPV: rho = - 0.778, p &lt; 0.001). Patients with good initial microcirculation (cutoffs: MFI &gt; 2.84, PPV &gt; 88%) showed a deteriorated microcirculation after red blood cell transfusion. An impaired microcirculation improved after transfusion. At both transfusion thresholds, approximately one third of the patients showed an initially impaired microcirculation. In contrast, one third in every group had good microcirculation above the cutoff variables and did not profit from the transfusion. Conclusion The data suggest that the established transfusion thresholds and other hemodynamic variables do not reflect microcirculatory perfusion of patients. Blood transfusion at both thresholds 75 g/l and 90 g/l hemoglobin can either improve or harm the microcirculatory blood flow, questioning the concept of arbitrary transfusion thresholds.</abstract><cop>LONDON</cop><pub>Springer Nature</pub><pmid>31952555</pmid><doi>10.1186/s13054-020-2728-7</doi><tpages>10</tpages><orcidid>https://orcid.org/0000-0002-1453-4180</orcidid><orcidid>https://orcid.org/0000-0002-2013-4140</orcidid><oa>free_for_read</oa></addata></record>
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subjects Aged
Blood
Blood flow
Blood transfusion
Capillary density
Cardiogenic shock
Critical Care Medicine
Critical illness
Diseases
Erythrocyte Transfusion - classification
Erythrocyte Transfusion - methods
Erythrocyte Transfusion - trends
Female
General & Internal Medicine
Glycosylated hemoglobin
Health aspects
Hemoglobins
Humans
Infrared spectroscopy
Intensive care
Intensive care unit
Intensive Care Units - organization & administration
Intensive Care Units - statistics & numerical data
Investigations
Life Sciences & Biomedicine
Male
Measurement
Microcirculation
Microcirculation - physiology
Microscopy
Middle Aged
Mortality
Mouth Floor - blood supply
Mouth Floor - physiopathology
Observational studies
Patient outcomes
Pay-per-view television
Physiological aspects
Prospective Studies
Science & Technology
Shock
Spectroscopy
Spectroscopy, Near-Infrared - methods
Sublingual microcirculation
Transfusion
Transfusion Medicine - methods
Transfusion Medicine - standards
Vessel perfusion
title Sublingual microcirculation does not reflect red blood cell transfusion thresholds in the intensive care unit-a prospective observational study in the intensive care unit
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