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Volume Assessment & Endpoints of Resuscitation

Determination of intravascular volume status and endpoints of resuscitation: limitations of CVP, role of lactate, ScvO2, and IVC ultrasound in guiding resuscitation.

Source
Volume Assessment | SurgCritCare
Status
review pending
Updated
5/29/2026
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  • Endpoints of resuscitation* are clinical and laboratory findings that indicate a patient has returned to normovolemia after hypovolemic shock.
No single number confirms adequate volume status.

Poor Volume Indicators

Indicator • Why Unreliable • Heart rate / Blood pressure
Section
IndicatorWhy Unreliable
Heart rate / Blood pressurePoor volume indicators in isolation
CVPConsistently poor correlation with blood volume (Marik PE, Chest 2008)
Hemoglobin / HematocritReflects resuscitation fluid — never use for acute volume assessment

Useful Tools

Accurate for acute blood loss hypovolemia • Goal: normalize within first 6 hours
Section

Serum Lactate

  • Accurate for acute blood loss hypovolemia
  • Goal: normalize within first 6 hours

ScvO2 (Superior Vena Cava O2 Saturation)

  • Normal: 70–80%
  • Represents DO2 minus VO2 — confirms hypovolemia when low
  • Use as additional data point, not in isolation

IVC Ultrasound (Transhepatic)

  • Minimally or non-compressible IVC throughout respiratory cycle → normovolemia

Signs of Adequate Volume Status

MAP > 65 mmHg off all pressors • Lactate corrected over 2 measurements within 6 hours • Metabolic acidosis correcting (normalizing...
Section
  • MAP > 65 mmHg off all pressors
  • Lactate corrected over 2 measurements within 6 hours
  • Metabolic acidosis correcting (normalizing base deficit)
  • Non-compressible IVC on ultrasound

If Targets Not Met

Consider: ongoing blood loss, SIRS, missed injuries.
Section

Consider: ongoing blood loss, SIRS, missed injuries.

  • Adapted from SurgCritCare. org for structured display and mobile use. Verify against current institutional policies and attending guidance.*
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