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VV-ECMO — Advanced ARDS Management Protocol

Venovenous extracorporeal membrane oxygenation in refractory hypoxemic respiratory failure unresponsive to conventional lung-protective ventilation.

Written by: Saygı Hospital Health Guide Editorial Board
Published: · Last updated:

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What is VV-ECMO — Advanced ARDS Management Protocol?

VV-ECMO (Veno-Venous Extracorporeal Membrane Oxygenation) is a life-support system that temporarily assumes pulmonary function in respiratory failure. Blood is drained from a vein, oxygenated via a membrane oxygenator with CO2 removal, and returned to another vein (or to a different segment of the same vein). It does not support cardiac function.

Indications — severe ARDS with Murray score ≥3, P/F <80 (after >6 hours on optimal ventilation), pH <7.25 and PaCO2 >60 (when the disease is potentially reversible), bridge therapy (to transplant or recovery). The EOLIA trial (2018) did not show superiority of early VV-ECMO over conventional care, although mortality trended lower (28% vs 35%, p=0.09).

Cannulation — single-cannula (dual-lumen jugular — Avalon/Dragonfly) or dual-cannula (femoral drainage + jugular reinfusion). Target flow 4-6 L/min for adequate oxygenated return. Anticoagulation — heparin infusion targeting ACT 180-220 s or aPTT 1.5-2× baseline.

Ultra-protective ventilation (Gattinoni) — Vt 3-4 mL/kg, PEEP 10-15, plateau <25 cmH2O, FiO2 <0.5, respiratory rate 10-15. The aim is lung rest to allow recovery. Minimize sedation, plan for early mobilization.

Symptoms

Severe refractory ARDS — PaO2/FiO2 <80 despite optimal ventilation and prone positioning, with FiO2 1.0 and PEEP ≥15
Hitting pressure/volume limits on the ventilator (plateau >30 cmH2O) and respiratory acidosis with pH <7.25
Murray score ≥3 (combined scoring of PaO2/FiO2, PEEP, compliance, chest X-ray) or favorable RESP score
Bridge to lung transplantation — a suitable candidate with life expectancy
Severe ARDS caused by COVID-19, influenza, or bacterial pneumonia — potentially reversible cause

Risk Factors

Absolute contraindications — advanced multi-organ failure (SOFA >15), active intracranial hemorrhage, advanced malignancy, irreversible primary pathology
Relative contraindications — age >65-70 (individualized), mechanical ventilation for >7-10 days, severe obesity (BMI >45), serious comorbidities
Bleeding risk — mandatory anticoagulation, platelets <50 000, fibrinogen <1.5, active GI bleeding
Cannulation complications — major vascular injury, cardiac tamponade, air embolism
Infection — catheter-related bloodstream infection (5-10% per day, particularly with ECMO duration >14 days)

When to See a Doctor?

If you experience any of the following symptoms, seek medical attention promptly:

  • Severe ARDS unresponsive to conventional therapy with P/F <80 — early consultation with an ECMO center
  • Persistent hypoxemia despite prone positioning, NMB, and high PEEP; plateau pressure exceeding limits
  • Secondary causes investigated (infection, aspiration, barotrauma, pulmonary embolism excluded)

Treatment Methods

01
Patient selection — calculate Murray, RESP, and SAVE scores; consult the ECMO center; assess transport risk
02
Cannulation — single-cannula (jugular Avalon — lower cannula burden, easier early mobilization) or dual-cannula (femoral-jugular — easier placement, preferred in emergencies); echocardiographic/ultrasound guidance
03
Anticoagulation — start heparin infusion (bolus 50-100 U/kg, maintenance 7-20 U/kg/hour); target ACT 180-220 s (or aPTT 1.5-2×); argatroban as an alternative in HIT
04
Ultra-protective ventilation — Vt 3-4 mL/kg IBW, PEEP 10-15, plateau <25, FiO2 ≤0.5, RR 10-15, I:E 1:2. Goal: lung rest and prevention of atelectasis
05
Daily assessment — circuit inspection (thrombus, air), membrane function (pressure gradient), anticoagulation, infection monitoring (clinical rather than daily blood cultures), and signs of lung recovery (improved compliance, imaging)
06
Weaning — as lung function improves (P/F >150 during an ECMO-off trial, compliance >30), slowly reduce flow and turn off the gas sweep; assess over hours; decannulate if successful. Typical duration 7-14 days, sometimes >30 days in prolonged cases

Which Department to Visit?

You can visit our Göğüs Hastalıkları department for these complaints. Our specialist physicians will create the most suitable treatment plan for you.

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