Presentation on theme: "Synthetic and Biological Prostheses in Reconstructive Pelvic Floor Surgery Menchem Alcalay, MD Head, Urogynecology Unit Department of Ob Gyn Chaim Sheba."— Presentation transcript:
Synthetic and Biological Prostheses in Reconstructive Pelvic Floor Surgery Menchem Alcalay, MD Head, Urogynecology Unit Department of Ob Gyn Chaim Sheba Medical Center
Recurrence Prolapse Rate 29% of women who had surgery for GSI or POP. 1 10-20 % of patients will require further intervention after failed primary continence surgery. 2 2 Kholi N et al. Am J Obstet Gynecol 1996;175:1476–1482. 1 Olsen AL, et al..Obstet Gynecol 1997;89:501–506.
Attributing Factors to Failure Inappropriate choice of procedure Inappropriate suture material Lack of surgical expertise Inherent deficiencies in tissue quality Inherent deficiencies in post operative healing Persistent intra abdominal pressure
Surgical Principles of Abdominal Hernia Repair In failure case - reinforcement of the repair by prosthetic graft. The graft should be left with no tension.
Ideal Prostheses Biocompatible Inert Lack of allergic / inflammatory response Sterile Non carcinogenic Resistant to mechanical stress Available and affordable
Xenografts Porcine or bovine derived tissue Ready availability Lack of ethical implications regarding human tissue usage No significant inflamatory response in animal trials Remodeling with collagenous infiltration FDA approval of animals (porcine small intestinal mucosa or bovine pericardium)
Experience of Abdominal Sacrocolpopexy 203 patients for 5 years 137 had previous failed surgery Recurrent vault prolapse - 2% 14 (7%) developed rectocele requiring surgery 24 (12%) developed GSI requiring surgery Mesh erosion in 4 (2%) Carey MP, Dwyer PL, Curr Op Ob Gyn 2001;13:499-505
Laparoscopic Sacrocolpopexy Results The laparoscopic procedure is long and has specific complications such as: Mesh rejection Massive bleeding from the presacral space 77 cases who underwent laparoscopic SC with mean FU of 1 year* : 1 recurrent cystocele who needs repair 2 cases of recurrent GSI that were operated Operative time: 292 to 180 minutes. * Cosson M et al. J Gynecol Obstet Biol Reprod (Paris) 2000 ;29:746-750.
Laparoscopic Sacrocolpopexy Results 19 patients underwent a sacral colpopexy, modified culdoplasty, and Burch urethropexy. Six paravaginal and 13 posterior vaginal repairs were performed. At 1 year, one patient had mild genuine stress incontinence (93% cure rate) and none had vault eversion (100% cure rate). Two patients had grade 1 cystocele; one had grade 1 and two grade 2 rectoceles. Ross JW. J Am Assoc Gynecol Laparosc 1997 Feb;4(2):173-83
Laparoscopic Sacrocolpopexy Results Reported 15 cases of laparoscopic ASC who were followed for 3-40 months. Cure rate for apical prolapse: 100% 1 patient required laparotomy for massive presacral bleeding. Nezhat CH, Nezhat F, Nezhat C. Obstet Gynecol 1994 ;84:885-8.
76 patients underwent the procedure 1993-1999 35 had also GSI Operating time: 100 - 345 minutes Mean hospital stay 4.9 days (2-10) Correction of the prolapse: 96% Complications: 1 small injury to colon 1 1 conversion to laparotomy - CO2 Bruyere F et al. Prog Urol 2001 Dec;11(6):1320-6 Laparoscopic Sacrocolpopexy Results
Anterior Colporrhaphy Prosthetic Reinforcement Results 24 women with recurrent cystocele had to classical repair or Marlex mesh repair. 2 years follow up Cystocele recurrence - 4/12 control 0/12 mesh p<0.05 Mesh related complications - 3/12 Julian TM. Am J Obstet Gynecol 1996 Dec;175(6):1472-5
Prospective randomized trial of polyglactin 910 mesh to prevent recurrence of cystoceles and rectoceles RCT comparing 160 patients with and without polyglactin 910 mesh. At 1 yr follow-up recurrent cystocele: Beyond mid vaginal plane (p=0.02): non mesh group – 43% mesh group – 25% To the hymenal ring (p=0.04): non mesh group – 10% mesh group – 2.5% 13 recurrent rectoceles were noted - no differences between groups. Polyglactin 910 mesh was found to be useful in the prevention of recurrent cystoceles Sand P et al. Am J Obstet Gynecol 2001 Jun;184(7):1357-62
Anterior colporrhaphy: a randomized trial of three surgical techniques 3 techniques: standard (ST), standard plus polyglactin 910 mesh (ST+), or ultralateral anterior colporrhaphy (ULT) 109 patients underwent operation, and 83 patients (76%) returned for follow-up FU - 23.3 months; satisfactory or optimal results: ST - 30%ST+ - 42%ULT – 46% These 3 techniques of anterior colporrhaphy provided similar anatomic cure rates and symptom resolution for anterior vaginal prolapse repair. The addition of polyglactin 910 mesh did not improve the cure rate compared with standard anterior colporrhaphy. Weber A et al. Am J Obstet Gynecol 2001 Dec;185(6):1299-304
Anterior Compartment Surgery with Prosthetic Reinforcement
Anterior Colporrhaphy Reinforced with Four Corner Anchored Polypropylene Mesh 38 patients – dissection to ATFP Follow up – 21 (12-29) months Success rate – 87% Concomitant SI – 100% cure with TVT (n=8) De novo SI – 16.7% (n=5) Erosions – 10.5% (n=4) Risk factors for failure – DM, chronic cough Hung MJ et al. Int Urogynecol J Pelvic Floor Dysfunct. 2004;15(6):399-406
Perigee System for Anterior Prolapse Repair Large-pore monofilament Polypropylene mesh system for correcting central defect and four self-attached horns for correcting lateral defect. The implanted procedure consist of four steps: –1) Lateral vaginal wall dissection as far as ischiopubic rami –2) Performance of two upper marks at genitofemoral fold and two lower marks at 2 cm laterally and 3 cm lower – 3) Insertion of the upper needles parallel to the ischiopubic rami and connection with the mesh's "arms" plus insertion of the lower needles vertically and connection with mesh's "legs" –4) Adjusting the mesh with free tension.
Transobturator correction of cystocele Initial results 15 patients FU – 3 months POP-Q points pre6 wks3 mon Aa +0.09 -3.00-2.73 Ba +1.73-2.82-2.82 No major complications Palma A et al. Actas Urol Esp. 2005 Jan;29(1):89-92.
Cochrane Systematic Review Surgical Management of POP in Women – 10/2004 Standard anterior repair was associated with more recurrent cystoceles than when supplemented by Vycril mesh overlay (RR 1.39, 95% CI 1.02-1.90). Data on morbidity and other clinical outcomes were too few for reliable comparisons. Maher C et al. The Cochrane Database on Systematic Reviews 2005 Issue 3
Anterior Compartment Repair with Prosthetic Reinforcement Mixed evidence supporting prosthetic reinforcement in primary cystocele repair Prosthetic graft does appear to improve outcome of recurrent cystocele Variable risk of erosion Erosion problem may be overcome by xenograft, but long term durability is unknown.
Posterior Compartment Reinforcement Standard technique (post. Colp.) with mesh interposition Bilateral mesh fixation to SSL with mesh interposition into the recto vaginal septum Insertion of sling at the level of ischiac spines with mesh attachment to the sling –Posterior IVS with mesh – Apogee
What is Small Intestinal Submucosa (SIS)? SIS is a natural biomaterial harvested from the porcine small intestine and made into a biocompatible medical product using a patented process. The final product is a three-dimensional, extracellular matrix (ECM) comprised of collagen, non-collagenous proteins and other biomolecules including glycosaminoglycans, proteoglycans, and glycoproteins. SIS is dried, packaged and sterilized, permitting long-term storage at room temperature. SIS is fabricated into a variety of shapes and thicknesses, and is easily rehydrated and handled during surgery.
Natural Extracellular Matrix Range of additional components ProteinsCarbohydrates Glycosaminoglycans (GAG) Proteoglycans (PG) Glycoproteins (GP) Collagen Lipids
Matrix Sequence Following implantation, tissues adjacent to the SIS matrix begin to deliver cells and nutrients. The body’s tissue grows completely into the surgical site while SIS maintains the needed tissue support. SIS is gradually replaced as the body reinforces and rebuilds the weakened site. Cells rapidly invade the SIS matrix. Capillary growth follows allowing more nutrients and cells to enter the matrix.
The SIS is already being invaded by adjacent cells. A mild inflammatory response is occurring and matrix deposition by the cells has begun. The SIS remains largely intact at this time point. Underlying Abdominal Muscle Area of Overlying Skin, Superficial Fascia, and Adipose Tissue SIS SIS After 7 Days
The SIS continues to be invaded by cells. A mild inflammatory response is present as the matrix is gradually remodeled. The SIS layers gradually separate as the cells populate the graft site and secrete their own matrix. SIS After 1 Month Underlying Abdominal Muscle Area of Overlying Skin, Superficial Fascia, and Adipose Tissue SIS
The delineation between SIS and the surrounding abdominal wall becomes difficult to distinguish as the SIS gradually takes on the appearance of the surrounding tissue. Except for a relative acellularity in comparison to the surrounding tissues, SIS can no longer be clearly identified. SIS After 3 Months Underlying Abdominal Muscle SIS
The SIS can no longer be distinguished from the surrounding abdominal tissue. The abdominal wall has been remodeled and resembles normal fibroadipose tissue with extensive vascularity and organized collagen bundles. Occasionally, pieces of SIS-like tissue can be distinguished, but clear identification of the SIS is no longer possible. Underlying Abdominal Muscle Area of Overlying Skin, Superficial Fascia, and Adipose Tissue Area of SIS Implant (SIS not detectable) SIS After 6 Months
SIS can no longer be seen, though the area of implant can be determined from the surrounding tissue due to the organized collagenous tissue remaining in the area. The area remains normally vascularized, and focal areas of muscle ingrowth are common. Any inflam- mation is completely resolved and the abdominal wall appears histologically normal. Underlying Abdominal Muscle Muscle Ingrowth Organized Collagenous Tissue SIS After 1 Year
The area of implant must be determined based on the location of the surrounding musculature and the fibroadipose tissue of the abdominal wall. There is no evidence of SIS and no evidence of inflammation. Muscle bundles and organized collagen can be seen in the area where the implant had been placed, but the area of implant cannot be discerned from the surrounding tissues. Organized Collagen Fat Overlying Abdominal Muscle Layer Muscle SIS After 2 Years
Conclusions Meshes are been used in reconstructive pelvic surgery for > 10 years Meshes reduce the rate of failure in recurrent cases of cystoceles The long term efficacy and potential morbidity associated with the new materials is unknwon Current evidence favor Type I synthetic polypropilene grafts (erosion ; infection) Xenografts are promising grafts