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Biomedical subjects

I A Brosens

Publications and source records attributed to I A Brosens.

At least 19 recordsLinked to original sources
PubMed1998

Endometriosis. Current issues in diagnosis and medical management.

OBJECTIVE: To explore the hypothesis that endometriosis is a disease not just because it exists but because it is functionally active. STUDY DESIGN: Qualitative research analyzing the morphologic appearances of endometriosis and the clinical effect of medical therapies. RESULTS: Analysis of the appearances of symptomatic endometriosis demonstrates that the ectopic endometriumlike tissue mimics eutopic endometrium but with loss of polarization. Ectopic implants resembling superficial endometrium are hemorrhagic and associated with adhesion and pseudocyst or endometrioma formation. Ectopic implants resembling basal or junction zone endometrium are associated with nodular adenomyotic lesions in the posterior fornix and pelvic supportive structures. They are characterized by smooth muscle hyperplasia and T-lymphocyte aggregates. CONCLUSION: Medical therapy has been shown to be very efficient in reducing pelvic pain as soon as amenorrhea is created and maintained. Regression, but not elimination, of the implant is obtained by medical therapy. Clinical data support the hypothesis that the efficacy of medical therapy is largely achieved by preventing cyclic bleeding in the implants.

Amenorrhea↗
PubMed1997

Endometriosis--a disease because it is characterized by bleeding.

The hypothesis is advanced that endometriosis, an ovarian steroid hormone-dependent process, is physiologic unless recurrent bleeding in the ectopic implants causes progressive disease and symptoms. Diagnosis should take into account the detection of chronic bleeding, and efficient medical treatment can be achieved by amenorrhea without the induction of hypoestrogenism.

Endometriosis↗
PubMed1996

Reconstruction of the ovary containing large endometriomas by an extraovarian endosurgical technique.

OBJECTIVE: To describe and evaluate the surgical treatment of large ovarian endometriomas by an extraovarian endosurgical technique. DESIGN: Prospective case series study. SETTING: University center and tertiary referral center for endoscopic surgery. PATIENTS: Patients with large ovarian endometriomas. INTERVENTION: A two-step endosurgical procedure: the first step is a combined diagnostic and operative procedure confirming the diagnosis and preparing the involution of the pseudocyst and the second step includes adhesiolysis and superficial coagulation of the inverted cortex. MAIN OUTCOME MEASURES: Operative findings and recurrence of endometriomas in the operated ovaries. RESULTS: Sixteen patients presenting with 20 large typical ovarian endometriomas were operated using the two-step endosurgical technique. Both steps were performed on 18 endometriomas. One patient with bilateral endometriomas refused the second endoscopic procedure. The long-term follow-up showed no recurrence in the 18 ovaries that were treated by the two-step endoscopic technique. CONCLUSIONS: The two-step extraovarian endosurgical technique can be applied in large typical endometriomas to reconstruct the ovary without excision and is followed by a low recurrence rate.

Adult↗
PubMed1996

Peritoneal healing after fibrin glue application: a comparative study in a rat model.

The influence of fibrin glue on adhesion formation and peritoneal healing is evaluated in a prospective, randomized, controlled study. In all, 20 Wistar rats underwent microsurgical suturing of two silicone sheets, one covered with a fibrin glue barrier, to the anterior peritoneum. Each animal thus served as its own control. After 10 days, adhesions and peritoneal healing were evaluated by a blinded observer through a second-look laparotomy. Adhesions were scored using a modification of the classification of Diamond. Tissue around the silicone sheet was examined histologically and by scanning electron microscopy to evaluate the inflammatory reaction and peritoneal healing (ingrowth of blood vessels and quality of peritoneal cells). Adhesion scores for treated and control sides were (mean +/- SD) 2.89 +/- 4.68 and 6.79 +/- 9.09 (P = 0.181) respectively, and the percentage of the sheet covered by peritoneum was 26.25 +/- 31.50 and 29.21 +/- 40.21 (P = 0.226) respectively. Using the paired Wilcoxon rank test, the P values for the ingrowth of blood vessels and peritoneal healing evaluated by histology and scanning electron microscopy were 0.842, 0.692 and 0.695 respectively. We conclude that although the mean adhesion score was reduced by > 50% by fibrin glue, there is no statistically significant difference concerning adhesion formation or peritoneal healing with the use of fibrin glue.

Animals↗
PubMed1995

Intrauterine endoscopic creation of urinary tract obstruction in the fetal lamb: a model for fetal surgery.

OBJECTIVE: Our purpose was to evaluate the feasibility of intrauterine endoscopic fetal surgery in a fetal lamb model by creating a urinary tract obstruction. STUDY DESIGN: Lower urinary tract obstruction was created by ligation of the urethra and urachus in 21 fetal lambs, eight at 95 to 105 days' gestation (term 145 days) and 13 at 70 to 75 days. The endoscopic approach consisted of a 0-degree 5 mm telescope, three 5 mm cannulas, uterine distention by amnioinfusion, and adapted instrumentation. Intrauterine fetal monitoring included temperature and pulse oximetry registration. RESULTS: In 20 cases the urachus could be identified and ligated inside the umbilical cord. The urethra was ligated in the anterior abdominal wall (n = 7) or obstructed at the level of the penis (n = 13). Mean fetal heart rate was 147 +/- 35 beats/min, and fetal temperature at the end of intervention was 38.14 degrees +/- 2.1 degrees C. The overall postoperative survival rate was 76%. CONCLUSION: Urinary tract obstruction can be created endoscopically in the fetal lamb. This operation can serve as a model for endoscopic fetal surgery.

Animals↗
PubMed1995

Clinical value and cumulative pregnancy rates following rigid salpingoscopy during laparoscopy for infertility.

This study was designed to evaluate the routine use of rigid salpingoscopy during diagnostic laparoscopy for infertility, and to relate the morphologic image of the endosalpinx with pregnancy outcome. A total of 158 consecutive patients (232 Fallopian tubes) undergoing a diagnostic laparoscopy for infertility were studied. Salpingoscopy was performed at the time of diagnostic laparoscopy for infertility. The intraluminal image was classified using a simplified classification (class I-V). The relationship between this classification and the cumulative pregnancy rates was calculated using life table analysis. Patients with a normal salpingoscopy (class I and II) had a 71% cumulative pregnancy rate. In the intermediate group (class III) the cumulative pregnancy rate was 34%. No intrauterine pregnancies were observed in the group with severe intratubal pathology (class IV and V). Of the 107 slapingoscopies of patients with endometriosis 105 (98%) were class I or II. However, among patients with pelvic adhesions, only 42% were normal. Nine out of 50 abnormal salpingoscopies were found when no tubal factor was suspected during laparoscopy, without any pelvic adhesions. These results suggest that salpingoscopy is an important tool for detecting mucosal abnormalities, and for eventually referring patients for assisted reproductive technology. Salpingoscopy is usually normal in patients with endometriosis, but in patients with non-endometriotic pelvic adhesions it is not.

Adult↗
PubMed1994

A model for fetal surgery through intrauterine endoscopy.

Video-endoscopic technology may offer new hope for the future of fetal surgery. Ten time-dated pregnant ewes (95 to 105 days; term, 145 days) were used to develop a model of fetal surgery through intrauterine endoscopy. Special 5-mm ports were designed with short, flexible, balloon-tipped shafts. The cannulas were inserted through purse-stringed hysterostomies. Amnioinfusion of warmed physiological fluid (Hartmann) was used as the work medium. Fetal heart rate and oxygen saturation (pulse oximetry), temperature, and amniotic pressure were monitored continuously through endoscopically placed sensors. Surgical procedures included subcutaneous dissection of the abdominal wall and ligation of the urethra in the male fetus (n = 7), ligation of the urachus within the umbilical cord (n = 8), and endoscopy of the fetal esophagus and trachea (n = 6). Bloodless surgery was achieved with a novel coagulation device that allows bipolar cutting and coagulation in an electrolyte-rich fluid medium. The mean fetal operative time was 147 minutes (range, 130 to 195). The intraamniotic temperature was maintained between 38.0 +/- 0.9 degrees C and 41.7 +/- 1.7 degrees C throughout the procedure. Oxygen saturation ranged from 51 +/- 20% to 72 +/- 14%, and fetal heart rate from 120 to 140 beats per minute. In conclusion, intrauterine endoscopy in a fluid medium allows fully monitored surgical procedures, lasting more than 2 hours, to be performed on the fetal lamb.

Animals↗
PubMed1994

The endoscopic localization of endometrial implants in the ovarian chocolate cyst.

OBJECTIVE: To describe the characteristics of the endometrial cyst and to locate the implants for selective biopsy. DESIGN: Prospective study. SUBJECTS: Fifty-one women with one or two ovarian chocolate cysts of 3 cm or more were investigated. INTERVENTIONS: Laparoscopy and random biopsy versus a new technique of ovarioscopy and selective biopsy. MAIN OUTCOME MEASURE: Visual characteristics and histopathology of endometrial cysts. RESULTS: The clinical suspicion of an endometrioma was confirmed in a series of 59 hemorrhagic cysts by histopathology in 89% and 42%, respectively, of typical and atypical cases and in 27% of recurrent chocolate cysts in the presence of postoperative adhesions. The atraumatic technique of ovarioscopy allowed description of the typical characteristics of the inner wall of the endometrioma and location of the active implants for biopsy. Endometrial tissue was obtained by small ovarioscopy-guided biopsies in 82% of the cases versus 42% in large random biopsies. Red lesions were highly significant for a mucosa-type implant and were predominantly located at the site of invagination stigma and adhesions with the pelvic wall. CONCLUSIONS: Endoscopy of ovarian chocolate cysts allows observation of typical features of the wall that differentiates it from other benign cysts of the ovary. Microbiopsies obtained under endo-ovarian endoscopy provided significantly more active, endometrial tissue than random biopsies. The data confirm that in most cases the endometrioma is formed by invagination of the cortex and that active implants are located at the site of invagination. Ovarioscopy is therefore proposed as a useful tool to differentiate in doubtful cases between a hemorrhagic functional and an endometriotic cyst and to select the sites for biopsies.

Adult↗
PubMed1994

Polycystic ovarian disease treated by laparoscopic argon laser capsule drilling: comparison of vaporization versus perforation technique.

Forty-four anovulatory women with polycystic ovarian disease (PCOD) were laparoscopically treated with the argon laser. Eighty percent of them were previously resistant to clomiphene citrate therapy. After surgery spontaneous ovulation occurred in 80% of the women. Spontaneous conception occurred in 55% of patients, and another 18% of the women who were previously resistant to clomiphene citrate conceived post-operatively after clomiphene citrate therapy. This gives an overall conception rate of 73% after 18 months (using life table analysis). Two different drilling techniques were used: classical vaporization of the ovarian capsule (22 women), and simple perforation of the ovarian capsule with subcapsular destruction of the ovarian stroma (22 women). No different ovulation or pregnancy rates were observed post-operatively between the two techniques. These results suggest that patients with PCOD can be induced to ovulate, and subsequently conceive, by laparoscopic argon laser treatment. The technique with minimal trauma to the ovarian capsule seems preferable.

Adult↗
PubMed1994

Fetoscopy-guided fetal endoscopy in a sheep model.

Video-endoscopic surgical treatment of the fetus may, in the future, become an alternative to open fetal operation. Six 95-day-old fetal lambs were examined through intrauterine endoscopy using amnioinfusion and specially designed balloon-tipped cannulas. The fetuses were monitored endoscopically for oxygen saturation, heart rate and temperature throughout the procedure. With a rigid 5 millimeter telescope and a flexible 3 millimeter endoscope, the respiratory and upper gastrointestinal tracts could be examined. No mucosal or other trauma was noted upon completion of the endoscopy; all lambs survived the procedure. While the applications of fetal endosurgery are likely to be similar to those of open fetal operation, fetal endoscopy (looking in the fetus) is a new entity for which clinical relevance (rather than mere feasibility) remains to be demonstrated. This technique, however, could become a valuable research tool to study fetal gastrointestinal and pulmonary physiologic factors in situ.

Animals↗
PubMed1994

New principles in the management of endometriosis.

The current management of endometriosis includes expectant, medical, surgical and combined therapies and the selection is based on the staging of the disease proposed by the American Fertility Society (AFS). This approach, however, has proven to be inadequate for the selection of medical treatment. Peritoneal endometriosis represents a range of lesions of different activity and stage of evolution. Surgical resection carries a risk of adhesion formation. Two to three months of medical therapy can induce inactivation and regression of active lesions. These factors should be taken into account in the selection of therapy. Ovarian endometrial cysts are indications for reconstructive surgery. The extent of adhesions and fibrosis, rather than the size of the cyst, determine the surgical outcome. The invaginated cortex explains the frequent association with lutein cysts. Large cysts can be conservatively treated at laparoscopy in a three-step procedure with a 3-month medical therapy between the first and second laparoscopy. Deep nodular endometriosis presents different lesions varying from fibrosis to adenomyosis. The effect of a therapeutic medical trial can be evaluated within 2 months. Different modalities are available for long-term medical therapy. Surgical resection is the treatment of choice for the adenomyosis type.

Endometriosis↗