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  • Atomic, Molecular and Optical Physics  (3)
  • Colonoscopy  (3)
  • Ileal pouch-anal anastomosis  (3)
  • 1
    ISSN: 1530-0358
    Keywords: Ileal pouch-anal anastomosis ; Complication ; Function ; Fistula ; Stricture ; Anastomotic separation ; Pelvic sepsis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract PURPOSE: This study investigated the functional significance of perineal complications after ileal pouch-anal anastomosis. METHODS: Review of a prospective registry of 628 patients was undertaken. Bowel function was assessed by detailed functional questionnaire. Statistical analyses were performed using chi-squared and Fisher's exact probability tests. RESULTS: Of 628 patients, 153 (24.4 percent) had 171 perineal complications. The 277 control patients had no complications. Complications included 66 (10.5 percent) anastomotic strictures, 28 (4.5 percent) anastomotic separations, 36 (5.7 percent) pouch fistulas, 41 (6.5 percent) episodes of pelvic sepsis, and 18 (2.9 percent) patients with multiple complications. After these complications were addressed, the pouch failure rate was low (10 percent); in 90 percent of patients, the pouch could be salvaged. Most pouch failures were the result of pouch fistulas, and most occurred in patients ultimately diagnosed with Crohn's disease. Functional results after cure of these perineal complications revealed no significant functional differences between control patients and those cured of anastomotic separations, anastomotic strictures, and pouch fistulas. Only a few minor differences were demonstrated in function after an episode of pelvic sepsis. The major deterioration in function occurred after treatment for multiple perineal complications. CONCLUSIONS: An appreciable number of perineal complications occur after ileal pouch-anal anastomosis. Pouch-perineal fistulas are associated with the highest pouch failure rate. The majority of these fistulas occur in patients ultimately diagnosed with Crohn's disease or indeterminate colitis. Although there is no substitute for good technique and sound clinical judgment in the success of ileal pouch-anal anastomosis, if perineal complications are successfully treated, functional outcome is equivalent to that in patients without perineal complications.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Diseases of the colon & rectum 38 (1995), S. 402-406 
    ISSN: 1530-0358
    Keywords: Colonoscopy ; Fluoroscopy ; Cecum ; Ileocecal valve ; Transillumination ; Appendiceal orifice
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract PURPOSE: Establishing intubation of the cecum can be a laborious, frustrating, and sometimes erroneous endeavor. Following confirmed colonoscopic intubation of the cecum, the presence of three anatomic landmarks (alone and in combination) were evaluated to precisely define their reliability. METHODS: Between February 1991 and January 1992, 771 of 904 consecutive colonoscopic examinations were completed to the cecum as confirmed by fluoroscopy. RESULTS: All three cecal landmarks studied (ileocecal valve, appendiceal orifice, and transillumination) were present in 64 percent of patients, and two landmarks were seen in 32 percent (96 percent of patients had multiple landmarks). The ileocecal valve was the most reliable cecal landmark (98 percent), followed by the appendiceal orifice (87 percent) and transillumination through the abdominal wall (75 percent). CONCLUSIONS: The ileocecal valve is the most reliable cecal landmark and is invariably visualized, even when all other cecal landmarks are obscure. Although other cecal landmarks are usually identifiable, they are most valuable when found in association with the ileocecal valve.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Diseases of the colon & rectum 38 (1995), S. 964-968 
    ISSN: 1530-0358
    Keywords: Colonoscopy ; Fluoroscopy ; Diverticulitis ; Cecum
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract PURPOSE AND METHODS: Certain factors in a patient's history, such as prior abdominal surgery or complicated diverticular disease, have been reported to hinder cecal intubation during colonoscopy. Over a 16-month period, 1,047 consecutive colonoscopies were prospectively evaluated to determine whether these factors were indeed clinically relevant. RESULTS: Of the 90 patients (9 percent) who had incomplete intubation of the colon, there were significantly more women (66 percent) than men (34 percent) (P 〈0.001). Women with a history of abdominal hysterectomy had a significantly lower cecal intubation rate (P 〈 0.01). A history of diverticulitis did not alter the cecal intubation rate. In patients with incomplete colonic intubation, the most proximal extent of intubation was the sigmoid colon in women (31 percent) and the right colon in men (68 percent). Sixty-seven percent of patients with incomplete intubation of the colon had a prior colonoscopy completed to the cecum (67 percent women, 67 percent men), whereas 50 percent had a follow-up colonoscopy completed to the cecum (56 percent women, 40 percent men). CONCLUSIONS: Women, especially those with a history of abdominal hysterectomy, had a significantly lower cecal intubation rate usually because of an impassable sigmoid colon. Prior inability to complete colonoscopy to the cecum does not necessarily forecast future failure.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1530-0358
    Keywords: Ileal pouch-anal anastomosis ; Afferent limb obstruction ; Enteroenterostomy ; Pouchopexy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract PURPOSE: Small-bowel obstruction is a common complication after ileal pouch-anal anastomosis (IPAA). Acute angulation of the afferent limb at the pouch inlet is the cause of obstruction in a subset of patients requiring laparotomy. METHODS: Patients were identified from the Lahey Clinic ileoanal pouch registry, a prospective computerized database of all patients who have undergone IPAA since 1980. Records of patients who were identified as having afferent limb obstruction as a cause of bowel obstruction after IPAA were reviewed. RESULTS: A total of 567 patients had undergone total proctocolectomy and ileoanal J-pouch at time of the study. Of 122 patients with one or more episodes of obstruction after IPAA, 48 required operative intervention. Afferent limb obstruction was identified as the cause of obstruction in six patients (12 percent). The most common presentation was recurrent partial obstruction (4 of 6 patients). Contrast small-bowel series and enemas were suggestive of obstruction in four of six patients, the most consistent radiographic finding being small-bowel dilation to the level of the pouch inlet. All patients underwent laparotomy for unresolved obstruction. Intraoperatively, the afferent limb was found to be adherent posterior to the pouch, causing acute angulation at the pouch inlet. Rather than risk injury to the pouch or its mesentery, the obstruction was bypassed by side-to-side anastomosis of the afferent limb to the pouch (enteroenterostomy) in five of six patients. One patient underwent ileostomy only because of technical considerations. Two patients required re-exploration and pexy of the afferent limb to the pelvic sidewall (pouchopexy) to relieve recurrent afferent limb obstruction. CONCLUSION: Afferent limb obstruction should be suspected in patients with recurrent obstruction after IPAA. Bypass of the obstructed segment from distal ileum to the pouch is safe and effective treatment. Because of the risk of recurrent afferent limb angulation, concurrent pouchopexy should be considered.
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 1530-0358
    Keywords: Health-related quality of life ; Familial adenomatous polyposis ; Ileorectal anastomosis ; Ileal pouch-anal anastomosis ; Functional outcome ; SF-36
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract PURPOSE: The main impetus for a patient with familial adenomatous polyposis to choose colectomy with ileorectal anastomosis over ileal pouch-anal anastomosis is the better functional result. However, does better functional result necessarily translate into better overall quality of life? Previous studies of other diseases have demonstrated no such correlation. This study was performed to determine whether any relationship exists between functional result and quality of life in patients with familial adenomatous polyposis after ileorectal anastomosis and ileal pouch-anal anastomosis. METHODS: All patients with familial adenomatous polyposis who underwent colectomy with ileorectal anastomosis or proctocolectomy with ileal pouch-anal anastomosis from 1980 to 1998 were studied. Functional data were obtained by questionnaire. Health-related quality of life was assessed by two validated instruments, the SF-36 Physical and Mental Health Summary Scales and the SF-36 Health Survey, which measure physical and mental functioning and eight separate health-quality dimensions, including health perception, physical and social functioning, physical and emotional role limitations, mental health, bodily pain, and energy or fatigue. RESULTS: Data were obtained in 44 of 68 patients, 14 with ileorectal anastomosis and 30 with ileal pouch-anal anastomosis. No differences were demonstrated between the two groups for patient age, mean follow-up time, and mean patient age at operation. Functional results were worse for the ileal pouch-anal anastomosis groupvs. the ileorectal anastomosis group in number of bowel movements per day (7.5vs. 5.2;P〈0.05), leakage (43vs. 0 percent;P〈0.01), pad usage (17vs. 0 percent;P〈0.01), perianal skin problems (33vs. 7 percent;P〈0.01), food avoidance (80vs. 43 percent;P〈0.01), and inability to distinguish gas (37vs. 7 percent;P〈0.01). Results of the health-related quality-of-life surveys, however, demonstrated no difference between the ileal pouch-anal anastomosis and ileorectal anastomosis groups. The Physical and Mental summary scales for the ileal pouchanal anastomosis and ileorectal anastomosis groups were not significantly different (Physical Health Scale, 50.3vs. 50.9; Mental Health Scale, 51.7vs. 49.6), and none of the eight dimensions of the SF-36 health survey demonstrated statistical differences between the ileal pouch-anal anastomosis and ileorectal anastomosis groups. CONCLUSION: Better functional results were not equated with better quality of life in this pilot study. Although patients with the ileorectal anastomosis have better functional results than those withileal pouch-anal anastomosis, the measured health-related quality of life as determined by a validated generic health-related quality-of-life instrument is the same for both groups. These results suggest that all patients with familial adenomatous polyposis might be optimally treated with an ileal pouch-anal anastomosis. More importantly, this study suggests that health-related quality of life should play a greater role in the evaluation of care and treatment in colon rectal surgery.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Surgical endoscopy and other interventional techniques 7 (1993), S. 33-36 
    ISSN: 1432-2218
    Keywords: Colonoscopy ; Fluoroscopy ; Cecum ; Ileocecal sphincter ; Appendiceal orifice ; Transillumination
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Confirming colonoscopic intubation of the cecum can be a laborious, time-consuming, and often frustrating endeavor. Anatomic landmarks may offer visual clues of cecal intubation, but the predictability of this evidence is unclear. The presence of three cecal landmarks, alone and in combination, were evaluated to precisely define their reliability. Between February and October of 1991, 601 of 708 (85%) consecutive colonoscopic examinations were able to be completed to the cecum as confirmed by fluoroscopy. All three cecal landmarks studied were present in 64% (386/601), two cecal landmarks in 32% (189/601), and one cecal landmark in 4% (26/601) of the patients. Therefore, at least two cecal landmarks were identified in 96% (575/601) of the patients. The ileocecal sphincter was identified in 98% (591/601) of patients overall, in 98% (185/189) of patients with 2 cecal landmarks, and in 77% (20/26) of patients with 1 cecal landmark. The appendiceal orifice was seen in 87% (524/601) of patients overall and in 72% (137/189) of patients with 2 cecal landmarks. Transillumination through the abdominal wall was possible in 74% (447/601) of patients overall and in 30% (56/189) of patients with 2 cecal landmarks. In summary, the ileocecal sphincter is the most reliable cecal landmark and is invariably visualized, even when all other landmarks are obscure. While other cecal landmarks, such as the appendiceal orifice and transillumination, are consistently identified, they are most valuable when found in association with the ileocecal sphincter.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    International Journal of Quantum Chemistry 19 (1981), S. 131-137 
    ISSN: 0020-7608
    Keywords: Computational Chemistry and Molecular Modeling ; Atomic, Molecular and Optical Physics
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A compact and efficient scaled single-zeta basis set has been developed for use in conjunction with the coreless Hartree-Fock silicon effective potential. The scale factors were determined by minimizing the electronic energy of the disilane molecule. Based upon a generalized valence bond computation using this basis, we conclude that the classical concept of localized σ bonds is adequate to fully explain the electronic structure of disilane in analogy to the ethane molecule.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    International Journal of Quantum Chemistry 21 (1982), S. 565-579 
    ISSN: 0020-7608
    Keywords: Computational Chemistry and Molecular Modeling ; Atomic, Molecular and Optical Physics
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: We have employed an effective potential and a single-zeta basis in SCF-MO computations to estimate the relative stability of linear disilyne HSiSiH and five isomeric structures defined in earlier all-electron ab initio SCF-MO computations. The effect of electron correlation has been estimated by generalized valence-bond (GVB) computations for the five valence electron pairs of these structures. All our computations indicate that linear disilyne is the least stable structure and that H2SiSi, the silicon analog of vinylidene carbene, is the most stable structure. In these structures silicon occurs in divalent and tetravalent states. The nature of silicon bonding in these valence states is illustrated by contour diagrams of the GVB orbital pairs.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    International Journal of Quantum Chemistry 32 (1987), S. 547-554 
    ISSN: 0020-7608
    Keywords: Computational Chemistry and Molecular Modeling ; Atomic, Molecular and Optical Physics
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: In the original formulation of the MNDO method, the approximation of two-center two-electron integrals over p orbitals is not rotationally invariant, and the coulombtype integrals do not match their one-center counterparts. In recent computer codes the rotational invariance has been restored by dropping the original approximation for two-center exchange integrals over π orbitals, which at the same time disconnected these too from the one-center values. It is shown in this paper that the rotational invariance problem can be overcome in the framework of the original approximation. It is also demonstrated that the mismatch between the one- and two-center two-electron integrals may be the reason for the too short Si-Si bond lengths predicted by MNDO.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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