Free Flap Failure Recognition and Salvage

Algorithm Steps

1. ▶

   Start

   Suspected Free Flap Compromise

   Change in flap appearance or signals

   1. ●

      Action

      Baseline Flap Monitoring

      Normal postoperative appearance

      • COLOR: Pink, matches recipient site
      • CAPILLARY REFILL: 1-2 seconds
      • TEMPERATURE: Warm to touch
      • TURGOR: Soft, non-tense
      • DOPPLER: Audible arterial signal
      • MONITORING FREQUENCY:
      • - Q1h x 24h, then Q2h x 48h
      • - More frequent if high-risk
      1. ⚠

         Warning

         Clinical Changes Detected

         Deviation from baseline

         • ALERT SIGNS:
         • - Color change (pale OR dusky)
         • - Capillary refill change
         • - Temperature change (cool)
         • - Turgor change (tense OR flaccid)
         • - Doppler signal change/loss
         • IMMEDIATE ACTION: Call attending
         1. ◆

            Decision

            Type of Compromise?

            Arterial vs Venous vs Mixed

            1. ⚠

               Warning

               Arterial Insufficiency

               Inflow problem

               • CLINICAL SIGNS:
               • - PALE/WHITE flap
               • - Cool to touch
               • - Slow/ABSENT capillary refill
               • - Collapsed veins
               • - NO arterial Doppler
               • CAUSES:
               • - Thrombus
               • - Kink/compression
               • - Vasospasm
               • - Hematoma compression
               • TIME WINDOW: <6 hours optimal
               1. ●

                  Action

                  Immediate Bedside Interventions

                  While preparing for OR

                  • GENERAL:
                  • - Remove all dressings
                  • - Check for external compression
                  • - Optimize positioning (elevate/lower)
                  • - Warm room, warm blankets
                  • FOR VENOUS:
                  • - Leech therapy if available
                  • - Pinprick bleeding every 30 min
                  • - Heparin gauze
                  • FOR ARTERIAL:
                  • - Papaverine topically
                  • - Warm saline compresses
                  1. ●

                     Action

                     Pharmacologic Support

                     Anticoagulation/vasodilation

                     • HEPARIN (if not contraindicated):
                     • - Bolus 5000 units IV
                     • - Or therapeutic infusion
                     • DEXTRAN 40 (controversial):
                     • - 20 mL/hr if used
                     • ASPIRIN:
                     • - 325 mg daily if not on already
                     • VASODILATORS (for spasm):
                     • - Papaverine topical/intra-arterial
                     • - Verapamil intra-arterial
                     • - Nicardipine
                     1. ●

                        Action

                        Operative Exploration

                        Definitive management

                        • TIMING: Within 2-4 hours of diagnosis
                        • EXPLORATION:
                        • - Inspect anastomoses
                        • - Check for kink/compression
                        • - Evaluate thrombus
                        • THROMBECTOMY:
                        • - Fogarty catheter
                        • - Milking clot
                        • REVISION:
                        • - Re-do anastomosis if needed
                        • - Vein graft if length issue
                        • - Supercharged with additional vein
                        1. ◆

                           Decision

                           Salvage Successful?

                           Post-revision assessment

                           1. ✓

                              Outcome

                              Flap Salvaged

                              Continue close monitoring

                              • Increase monitoring frequency
                              • Continue anticoagulation
                              • Optimize conditions
                              • Watch for re-thrombosis
                              • Salvage success rate: 50-80%
                           2. ✓

                              Outcome

                              Flap Loss

                              Plan for reconstruction

                              • Debride necrotic tissue
                              • Wound care/VAC
                              • Consider: Second free flap, local flap, skin graft
                              • Timing: Delayed reconstruction
                              • Total flap loss rate: 2-5%
            2. ⚠

               Warning

               Venous Congestion

               Outflow problem (more common)

               • CLINICAL SIGNS:
               • - DUSKY/PURPLE/BLUE flap
               • - Warm or cool
               • - BRISK capillary refill (<1 sec)
               • - DARK blood on pinprick
               • - Tense, swollen flap
               • - Arterial Doppler may be present
               • CAUSES:
               • - Venous thrombus
               • - External compression
               • - Kinking
               • TIME WINDOW: <12 hours (more forgiving)