Hernia Repair With Open Component Separation



Hernia Repair With Open Component Separation


Ibrahim Khansa

Jeffrey E. Janis





ANATOMY



  • The layers of the lateral abdominal wall, from superficial to deep, are the external oblique, internal oblique, and transversus abdominis muscles, transversalis fascia, and peritoneum.


  • The segmental intercostal nerves to the abdominal wall musculature travel in the layer between the internal oblique and transversus abdominis muscles.


  • Vascular perforators to the abdominal wall skin emerge from the deep epigastric vessels.



    • They are arranged into a medial and a lateral row.


    • The medial row is dominant, especially the periumbilical perforators.


PATIENT HISTORY AND PHYSICAL FINDINGS



  • Assess if any indications for urgent surgery are present.



    • Bowel obstruction


    • Incarceration/strangulation


    • Infected mesh


  • Assess effect of hernia on the patient.



    • Ability to carry out activities of daily living


    • Pain at hernia site


    • Difficulty with defecation


  • On physical examination, look for:



    • Peritoneal signs


    • Reducibility of hernia


    • Edges of fascial defect


    • All scars on the abdomen (which will affect vascularity)


    • Presence of skin graft


    • Presence of a fistula


    • Presence of an ostomy


IMAGING



  • CT scan of the abdomen is useful to delineate:



    • The size, extent, and borders of the fascial defect


    • Whether component separation has been performed previously


    • The integrity of the musculofascial components (may have been previously resected)


    • An estimate of the loss of domain


    • Presence and position of prior mesh, if applicable


    • The thickness of soft tissue between the hernia (sac) and overlying skin


SURGICAL MANAGEMENT


Preoperative Planning



  • Assess suitability of the patient for major surgery.



    • Smokers and tobacco users should completely abstain for at least 4 weeks preoperatively and 4 weeks postoperatively.1,2


    • Nutrition should be optimized before surgery (prealbumin greater than 15 mg/dL, albumin greater than 3.25 g/dL).2,3


    • Diabetes should be well controlled (HbA1c ≤ 7.4%).2


    • Body mass index should be 42 or less, and preferably less than 40.2


  • After hernia dissection and lysis of adhesions, assess whether component separation is needed:



    • Apply Kocher clamps on the medial edge of the rectus complex on each side.


    • Attempt to simulate midline reapproximation of the rectus complexes by bringing the two sides toward each other.



      • If too much tension is present, which may result in fascial cheese wiring or inability to obtain primary musculofascial reapproximation, start with unilateral component separation and reassess.


      • If still there is too much tension after unilateral component separation, perform bilateral component separation.


Positioning



  • Supine with arms abducted 90 degrees and all pressure points padded



Approaches



  • Multiple approaches are possible for component separation.



    • Anterior component separation through the hernia defect itself:



      • Open


      • Minimally invasive


    • Anterior component separation through separate lateral incisions: Endoscopic


    • Posterior component separation: Transversus abdominis release (TAR)

Dec 6, 2019 | Posted by in Reconstructive microsurgery | Comments Off on Hernia Repair With Open Component Separation

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