The Role of Central Venous Oxygen Saturation (ScvO2) as an Indicator of Blood Transfusion in the Critically Ill

U

University of Szeged (SZTE)

Status

Unknown

Conditions

Anemia
Blood Transfusion; Hemoglobinemia
Hypoxia

Treatments

Biological: Blood transfusion

Study type

Interventional

Funder types

Other

Identifiers

NCT03138200
ScvO2 transfusion

Details and patient eligibility

About

Transfusion of red blood cells is an everyday practice in critical care with the primary aim of restoring adequate tissue oxygenation. However, blood transfusion may also be harmful and costly, therefore a so called restrictive transfusion regime has been suggested by recent guidelines. These transfusion guidelines consider certain levels of hemoglobin as transfusion trigger, which on its own gives little information if any about the balance between oxygen delivery (DO2) and consumption (VO2). Hence, there is a clear need for additional physiologic transfusion trigger values. One of the potentially useful and easily obtainable physiological parameters is the central venous oxygen saturation (ScvO2), which has been shown to be a potential transfusion trigger value in hemodynamically stable but anemic patients. However, the role of ScvO2 as a transfusion trigger value was examined only in a retrospective observational study and in animal experiment. The normal value of ScvO2 in a resting adult at rest is around 70-75%, which is the product of the VO2 and DO2 relationship. Low ScvO2 usually indicates inadequate DO2. It was found in an observational study that if ScvO2>70% before transfusion due to transfusion only the value of hemoglobin increased but the value of ScvO2 did not change. This finding indicates that the DO2 may have been adequate in spite of the low hemoglobin value and the transfusion may have been unnecessary. In one of their recent animal experiments, the investigators reported that in an isovolemic-anemia model the value of ScvO2<70% was only reached when the value of hemoglobin was far less, 59 g/L, than the recommended lowest value of 70g/L as transfusion trigger by guidelines. Despite the pathophysiological rationale and the encouraging results of retrospective studies and animal experiments, prospective randomized trials in order to test the effects of an ScvO2-assisted transfusion protocol are yet to be performed. The aim of this study is to investigate the effects of an ScvO2-assisted transfusion protocol as compared to the guideline-based, hemoglobin levels guided transfusion practice.

Enrollment

160 estimated patients

Sex

All

Ages

18+ years old

Volunteers

No Healthy Volunteers

Inclusion criteria

  • Adult (>18 y)
  • Critically ill anemic but hemodynamically stable patients treated on the ICU in whom transfusion is considered by the attending physician
  • Routine ICU monitoring: invasive blood pressure, CVC, hourly urine output
  • Anemia is defined as Hb<100 g/L

Hemodynamic stability is defined as:

  • heart rate (HR)<100/min,
  • mean arterial pressure (MAP)>60 mmHg
  • no or "minimal" requirement of noradrenaline (NA): compensation for sedation not exceeding 5 µg/min

stable homeostasis:

i. pH: 7.30-7.45 ii. HCO3 > 20 mmol/L iii. lactate < 2 mmol/L e. normal hourly urine output for the last 2 hours not facilitated by diuretics: >0.5ml/kg/h

Central venous catheter in situ (position in the v. cava superior confirmed by chest x-ray)

Exclusion criteria

  • Pregnancy
  • Head injury requiring ICP monitoring guided control of ICP
  • Shock of any origin
  • Patients with heart failure
  • Patients with renal failure

Trial design

Primary purpose

Supportive Care

Allocation

N/A

Interventional model

Single Group Assignment

Masking

None (Open label)

160 participants in 1 patient group

Blood transfusion based on central venous oxygen saturation
Other group
Treatment:
Biological: Blood transfusion

Trial contacts and locations

0

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Data sourced from clinicaltrials.gov

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