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1.
Rev Mal Respir ; 38(8): 797-806, 2021 Oct.
Article in French | MEDLINE | ID: mdl-34099358

ABSTRACT

INTRODUCTION: The objectives of our study were to estimate the prevalence of asthma in adults in France and to study the effects of gender on the associations of asthma with the corpulence and socio-economic characteristics of individuals. METHODS: We estimated the prevalence of current asthma (asthma attack in the past 12 months or current treatment for asthma) from data collected at inclusion in the Constances cohort study in 2013-2014. Analyses were performed separately in men and women, using robust Poisson regression for multivariate analysis. RESULTS: Using data from 34,100 participants in the cohort (men: 47.7 %; mean age: 44.6 years), the prevalence of current asthma was estimated to be 5.8 % (5.1 % in men, 6.4 % in women). The risk of asthma was increased in women with high body mass index (BMI) or waist circumference. In men, only a high waist circumference was associated with an increased risk of asthma. An association with low socioeconomic status was observed only among women. CONCLUSION: The associations of asthma with corpulence and socioeconomic status differed between men and women. Additional analyses should provide a better understanding of the mechanisms responsible for these differences.


Subject(s)
Asthma , Adult , Asthma/epidemiology , Body Mass Index , Cohort Studies , Cross-Sectional Studies , Female , France/epidemiology , Humans , Male , Prevalence , Waist Circumference
2.
Ann Fr Anesth Reanim ; 31(12): 933-6, 2012 Dec.
Article in French | MEDLINE | ID: mdl-23117038

ABSTRACT

INTRODUCTION: The use of magnesium sulfate (MgSO(4)) has been advocated since 2000 in France in the management of eclampsia. The aim of this study was to determine the frequency of use of this treatment for eclampsia in a French department. PATIENTS AND METHODS: All patients obstetrical patients admitted to Critical Care Units of Seine-Maritime for eclampsia over a period of 7 years (2002-2008) were included. Obstetric data, the treatment used for eclampsia and pre-eclampsia and maternofetal complications were collected. The primary outcome parameter was the use of MgSO(4) in the secondary prevention of eclampsia. RESULTS: Thirty-nine patients were included. Nineteen patients (48%) had eclampsia in prepartum, three (8%) in per-partum and 17 (44%) in post-partum periods. The use of MgSO(4) in the secondary prevention of eclampsia was observed in 92% of cases (36/39). Primary prevention was seen in 8% of cases. The duration of treatment was 2 days (1-7 days). The maternal and perinatal mortality was respectively 2.5 and 11%. CONCLUSION: In this study, the use of MgSO(4) in the secondary prevention is frequent. This result emphasizes the importance of the recommendations of learned societies in the homogenization of the management of rare but serious conditions such as eclampsia.


Subject(s)
Eclampsia/prevention & control , Magnesium Sulfate/therapeutic use , Tocolytic Agents/therapeutic use , Adolescent , Adult , Apgar Score , Critical Care , Eclampsia/mortality , Female , Fetal Death , Humans , Hypertension/chemically induced , Hypertension/drug therapy , Infant, Newborn , Magnesium Sulfate/adverse effects , Perinatal Mortality , Pre-Eclampsia/prevention & control , Pregnancy , Pregnancy Outcome , Retrospective Studies , Tocolytic Agents/adverse effects , Young Adult
4.
Ann Fr Anesth Reanim ; 28(9): 795-8, 2009 Sep.
Article in French | MEDLINE | ID: mdl-19647976
6.
Obes Surg ; 19(9): 1256-61, 2009 Sep.
Article in English | MEDLINE | ID: mdl-19437082

ABSTRACT

INTRODUCTION: Roux-en-Y gastric bypass (RYGB) restricts food intake. Consequently, patients consume less calcium. In addition, food no longer passes through the duodenum, the main site of calcium absorption. Therefore, calcium absorption is significantly impaired. The goal of this study is to compare two common calcium supplements in gastric bypass patients. METHOD: Nineteen patients were enrolled in a randomized, double-blinded, crossover study comparing the absorption of calcium from calcium carbonate and calcium citrate salts. Serum and urine calcium levels were assessed for peak values (C (max)) and cumulative calcium increment (area under the curve [AUC]). Serum PTH was assessed for minimum values (PTH(min)) and cumulative PTH decrement (AUC). Statistical analysis was performed using a repeated analysis of variance model. RESULTS: Eighteen subjects completed the study. Calcium citrate resulted in a significantly higher serum C (max) (9.4 + 0.4 mg/dl vs. 9.2 + 0.3 mg/dl, p = 0.02) and serum AUC (55 + 2 mg/dl vs. 54 + 2 mg/dl, p = 0.02). Calcium citrate resulted in a significantly lower PTH(min) (24 + 11 pg/ml vs. 30 + 13 pg/ml, p = 0.01) and a higher AUC (-32 + 51 pg/ml vs. -3 + 56 pg/ml, p = 0.04). There was a non-significant trend for higher urinary AUC in the calcium citrate group (76.13 + 36.39 mg/6 h vs. 66.04 + 40.82, p = 0.17). CONCLUSION: Calcium citrate has superior bioavailability than calcium carbonate in RYGB patients.


Subject(s)
Calcium Carbonate/pharmacokinetics , Calcium Citrate/pharmacokinetics , Dietary Supplements , Gastric Bypass , Obesity, Morbid/metabolism , Obesity, Morbid/surgery , Adult , Area Under Curve , Cross-Over Studies , Double-Blind Method , Female , Humans , Intestinal Absorption , Male , Middle Aged , Parathyroid Hormone/blood
7.
Med Mal Infect ; 38(11): 586-94, 2008 Nov.
Article in French | MEDLINE | ID: mdl-18976872

ABSTRACT

OBJECTIVE: The main aim of this study was to determine how much staff at the Clermont-Ferrand university hospital, France, knew about influenza and its relation with the vaccinal rate. The other aim was to develop better-targeted information campaigns and prevention policy in the work place. DESIGN: A self-administered questionnaire was sent to the 7601 salaried staff of the hospital in May 2005. The staff was asked to give details on socioprofessional characteristics, vaccinal status, and knowledge about the influenza virus (mode of transmission, contagiousness, measures of prevention, populations affected, mortality, vaccination schedule, and vaccination target populations). Multiple-choice questions on knowledge of influenza were scored according to the answer given. RESULTS: The response rate was 26.5%. The 2011 completed questionnaires were representative of the working staff. They showed a positive correlation between the rate of vaccination and knowledge of influenza, with a 0.98 coefficient. They also showed that the staff was very largely unaware of population groups most at risk for influenza (1% of correct answers). CONCLUSIONS: Primary prevention campaigns will only be effective if the target population has a better awareness of the issues involved. This study highlights the areas in which knowledge was heterogeneous or inadequate, and the information that could be decisive in increasing vaccinal coverage among staff. This information should focus on modes of transmission, contagiousness, mortality, and above all on populations at risk.


Subject(s)
Hospitals, University , Influenza Vaccines/administration & dosage , Influenza, Human/prevention & control , Personnel, Hospital/psychology , Personnel, Hospital/statistics & numerical data , Surveys and Questionnaires , Adolescent , Adult , Aged , France , Health Knowledge, Attitudes, Practice , Humans , Immunization/statistics & numerical data , Knowledge , Middle Aged , Young Adult
10.
Surg Endosc ; 18(7): 1029-37, 2004 Jul.
Article in English | MEDLINE | ID: mdl-15162240

ABSTRACT

BACKGROUND: Obesity is a growing health problem that contributes to numerous life-threatening or disabling disorders, including coronary artery disease, hypertension, type 2 diabetes mellitus, hyperlipidemia, degenerative joint disease, and obstructive sleep apnea. Significant weight reduction in the morbidly obese improves or reverses associated illness and benefits well-being. The purpose of the SAGES Appropriateness Conference was to summarize the state of the art for open and laparoscopic operations for the morbidly obese. METHODS: The English literature comparing bariatric procedures was reviewed and grouped by level of evidence by three surgeons (BS, LV, and CC). From more than 1,500 articles, all conference participants were provided with reprints and table summaries of no less than 50 selected manuscripts. Ten experts were requested to present reviews and make evidence-based arguments for and against the open and laparoscopic approaches in written format. An expert panel of six surgeons, including an ethicist and patient, commented on implications of data presented. The finalized statement was e-mailed to all participants for approval and comment. RESULTS: Consensus statements were achieved on various aspects of morbid obesity, including indications for surgery, resolution of comorbid illnesses with significant weight loss, and the importance of committed bariatric program. Our panel of experts agreed, in general, to the advantages of laparoscopic approaches compared to open operations in skilled hands. CONCLUSIONS: Laparoscopic Roux-en-Y gastric bypass (RYGB) affords improved short-term recovery compared to open gastric bypass. Laparoscopic adjustable banding can be performed with lower average mortality than either RYGB or any of the malabsorptive operations, and it produces variable degrees of short-term weight loss. Prospective randomized trials are needed to compare gastric bypass, malabsorptive, and restrictive procedures.


Subject(s)
Bariatrics/methods , Obesity, Morbid/surgery , Aftercare , Anastomosis, Roux-en-Y , Biliopancreatic Diversion/ethics , Biliopancreatic Diversion/methods , Comorbidity , Evidence-Based Medicine , Gastric Bypass/ethics , Gastric Bypass/methods , Gastroplasty/ethics , Gastroplasty/methods , Humans , Laparoscopy/ethics , Laparoscopy/methods , Malabsorption Syndromes/etiology , Obesity, Morbid/complications , Postoperative Complications , Treatment Outcome , Weight Loss
11.
Surg Endosc ; 17(11): 1796-802, 2003 Nov.
Article in English | MEDLINE | ID: mdl-12958683

ABSTRACT

BACKGROUND: Previous studies have shown that ursodiol decreases gallstone formation from 32% to 2% following open gastric bypass, but no data exist on laparoscopic Roux-en-Y gastric bypass (LRYGB) using intraoperative ultrasound (IOUS) screening. METHODS: LRYGB with IOUS were performed on 195 consecutive patients. Patients with gallstones underwent simultaneous cholecystectomy, and patients without gallstones were prescribed ursodiol, 300 mg twice daily, for 6 month. Follow-up survey and ultrasound. RESULTS: Of 195 patients, 44 (23%) had had a prior cholecystectomy, 21 (11%) underwent a simultaneous cholecystectomy, 129 (66%) had gallbladders left intact, and one (0.5%) false negative IOUS was excluded. Of 69 patients with ultrasound and survey follow-up (mean, 10 months), 19 (28%) developed gallstones seven with symptoms), and 50 (72%) were gallstone free. Forty-one percent of patients were compliant with ursodiol. There was no difference in compliance between patients with and without gallstones. In patients with gallstones, all of the symptomatic patients were noncompliant, whereas none of the compliant patients developed symptoms. Medication side-effects occurred in 17 of 69 patients (25%). CONCLUSIONS: IOUS during LRYGB efficiently screens for gallstones, and selective cholecystectomy followed by prophylactic ursodiol results in low morbidity. Improvements in compliance may lower the incidence of postoperative gallstone formation.


Subject(s)
Cholagogues and Choleretics/therapeutic use , Cholecystectomy, Laparoscopic , Cholelithiasis/prevention & control , Gastric Bypass , Intraoperative Care , Laparoscopy , Obesity, Morbid/surgery , Postoperative Complications/prevention & control , Ultrasonography, Interventional , Ursodeoxycholic Acid/therapeutic use , Adult , Anastomosis, Roux-en-Y , Cholagogues and Choleretics/administration & dosage , Cholelithiasis/complications , Cholelithiasis/diagnostic imaging , Cholelithiasis/drug therapy , Cholelithiasis/epidemiology , Female , Humans , Male , Middle Aged , Obesity, Morbid/complications , Patient Compliance , Postoperative Complications/drug therapy , Treatment Outcome , Ursodeoxycholic Acid/administration & dosage
12.
Surg Endosc ; 17(5): 679-84, 2003 May.
Article in English | MEDLINE | ID: mdl-12618940

ABSTRACT

BACKGROUND: Gastrointestinal leak is a complication of laparoscopic Roux-en-Y gastric bypass (LRYGB). Contrast studies may underdiagnose leaks, forcing surgeons to rely solely on clinical data. This study was designed to evaluate various clinical signs for detecting leakage after LRYGB. METHODS: We retrospectively reviewed 210 consecutive patients who underwent LRYGB between April 1999 and September 2001. There were nine documented leaks (4.3%). Clinical signs between patients with leaks (group 1) and those without leaks (group 2) were compared using univariate and multivariate logistic regression analysis. RESULTS: Evidence of respiratory distress and a heart rate exceeding 120 beats per min were the two most sensitive indicators of gastrointestinal leak. Routine upper gastrointestinal contrast imaging detected only two of nine leaks (22%). CONCLUSION: Leak after LRYGB may be difficult to detect. Evidence of respiratory distress and tachycardia exceeding 120 beats per min may be the most useful clinical indicators of leak after laparoscopic Roux-en-Y gastric bypass.


Subject(s)
Anastomosis, Roux-en-Y/adverse effects , Gastric Bypass/adverse effects , Laparoscopy/adverse effects , Laparoscopy/methods , Obesity, Morbid/surgery , Adult , Anastomosis, Roux-en-Y/methods , Anastomosis, Roux-en-Y/statistics & numerical data , Drainage , Female , Gastric Bypass/methods , Gastric Bypass/statistics & numerical data , Humans , Laparoscopy/statistics & numerical data , Logistic Models , Male , Multivariate Analysis , Postoperative Complications/etiology , Predictive Value of Tests , Respiratory Distress Syndrome/etiology , Retrospective Studies , Sensitivity and Specificity , Surgical Stapling/adverse effects , Surgical Stapling/statistics & numerical data , Tachycardia/etiology
13.
J Emerg Nurs ; 27(4): 327-34, 2001 Aug.
Article in English | MEDLINE | ID: mdl-11468626

ABSTRACT

INTRODUCTION: The new standards of the joint commission on accreditation of healthcare organizations specify the patient's right to appropriate assessment and management of pain. With this impetus, we looked at our own practice to see how well we assess and manage patients with pain. METHODS: Patients who presented with minor nonemergent pain were interviewed on arrival, and then again before discharge, with use of a structured questionnaire. A total of 68 completed pain surveys were analyzed. RESULTS: With use of a visual analog scale, patients rated their pain on arrival and at discharge; they also rated pain they were willing to accept when it was time for discharge. Sixty percent of the patients went home with more pain than they were willing to accept. Fifty-one percent of the patients were offered something for pain, and only half of them said the pain relief was adequate. The median time from arrival to administration of pain medication was 104 minutes. Surprisingly, the median patient satisfaction rating for overall care was "very good." DISCUSSION: This survey revealed that acute pain conditions are underevaluated and undertreated in one fast-track setting, suggesting that ED staff need more education about the management of acute pain. It also showed that relying on patient satisfaction surveys as surrogate markers for how well we manage pain is erroneous.


Subject(s)
Emergency Service, Hospital/standards , Emergency Treatment/standards , Pain Measurement/psychology , Pain Measurement/standards , Pain/prevention & control , Pain/psychology , Patient Satisfaction , Triage/standards , Acute Disease , Adult , Emergency Nursing/standards , Emergency Treatment/methods , Female , Health Services Research , Humans , Male , Nursing Evaluation Research , Pain/diagnosis , Practice Guidelines as Topic , Surveys and Questionnaires , Time Factors , Triage/methods
14.
Obes Surg ; 11(1): 46-53, 2001 Feb.
Article in English | MEDLINE | ID: mdl-11361168

ABSTRACT

BACKGROUND: The laparoscopic Roux-en-Y gastric bypass (LRYGBP) may be performed using a variety of methods. The purpose of this study was to learn how to perform the Roux-en-Y gastric bypass operation laparoscopically, using a porcine model. MATERIALS AND METHODS: 11 domestic pigs (mean weight 47 kg) underwent LRYGBP. In 8 animals, a completely laparoscopic approach was attempted, while in 3 animals a hand-assist device was used. Techniques for anvil placement, pouch calibration, and limb-length measurement were evaluated. Animals were sacrificed at the end of the procedure, and operative results were recorded. RESULTS: The hand-assist device restored tactile feedback but obscured visualization. The gastrojejunostomy leak rate was 64%, and the jejunojejunostomy leak rate was 73%. Anvil placement using transgastric and transoral methods was feasible. Calibrating the pouch with a Baker's tube was more accurate than using anatomical landmarks. Measuring limb-lengths using Babcock clamps was reliable with practice. CONCLUSION: The frailty of the porcine small intestine may limit one's ability to achieve intact anastomoses. Despite the anatomic limitations, the porcine model was well-suited for skill development and evaluation of techniques for performing the LRYGBP operation.


Subject(s)
Anastomosis, Roux-en-Y/methods , Disease Models, Animal , Gastric Bypass/methods , Gastroscopy/methods , Jejunum/surgery , Laparoscopy/methods , Stomach/surgery , Anastomosis, Roux-en-Y/adverse effects , Anastomosis, Roux-en-Y/instrumentation , Animals , Gastric Bypass/adverse effects , Gastric Bypass/instrumentation , Gastroscopy/adverse effects , Jejunostomy/adverse effects , Jejunostomy/methods , Laparoscopy/adverse effects , Obesity, Morbid/surgery , Suture Techniques , Sutures , Swine , Treatment Outcome
15.
Acta Psychiatr Scand Suppl ; (410): 63-8, 2001.
Article in English | MEDLINE | ID: mdl-11863053

ABSTRACT

OBJECTIVE: The authors present an account of the current state of sectorization in France and its development over the last decade. METHOD: The paper is based on statistics collected by the French Health Ministry and on relevant laws and regulations. Comments by patients, families and professionals are presented. RESULTS: The supply of mental health care is usually satisfactory, and there is a tendency for in-patient units to be converted into day hospitals. There is a large disparity between regions, especially in child and adolescent psychiatry. The 1838 law governing compulsory admissions was revised in 1990, and this revision was the object of a commission of inquiry in 1995. Psychiatric units work on the borders between health and social services and are forging new links between the two. CONCLUSION: Psychiatric care requires an integrated health and social perspective. In the field of mental health legislation European recommendations are called for.


Subject(s)
Mental Health Services/trends , Psychiatry/trends , Public Health/trends , Commitment of Mentally Ill/legislation & jurisprudence , Delivery of Health Care/organization & administration , Delivery of Health Care/trends , Family , France , Humans , Mental Health Services/legislation & jurisprudence , Psychiatric Nursing/organization & administration , Psychiatric Nursing/trends , Psychiatry/organization & administration
16.
Obes Surg ; 10(4): 361-5, 2000 Aug.
Article in English | MEDLINE | ID: mdl-11007630

ABSTRACT

BACKGROUND: Laparoscopic techniques have been used to perform the Roux-en-Y gastric bypass (RYGBP). The gastrojejunostomy may be constructed using an end-to-end anastomosis (EEA) stapler. Most reports describe passing the EEA anvil transorally using an esophagogastroscope and a pull-wire technique. METHOD: We describe problems experienced using this technique and present an alternative method. RESULTS: Esophageal injury may occur during laparoscopic RYGBP (LRYGBP) using the transoral anvil placement technique. When the anvil is retrieved into the gastric pouch, the anvil may become lodged at the cricopharngeus muscle. Dislodgment can be problematic and time-consuming. We present a case of mild esophageal injury which occurred during transoral anvil placement. The patient had transient postoperative dysphagia and recovered without sequelae. We present an alternative method in which the anvil is passed through a gastrotomy. CONCLUSION: Transgastric anvil placement alleviates the need for endoscopy, thereby saving time and resources. This technique eliminates the potential for esophageal injury. The transgastric anvil placement technique has proven reliable. The transgastric method may make the LRYGBP operation safer and easier to perform.


Subject(s)
Esophagus/injuries , Gastric Bypass/methods , Laparoscopy/methods , Adult , Anastomosis, Roux-en-Y , Female , Gastric Bypass/adverse effects , Humans , Laparoscopy/adverse effects
17.
Am Surg ; 66(7): 631-5, 2000 Jul.
Article in English | MEDLINE | ID: mdl-10917472

ABSTRACT

Age greater than 55 is often stated to be a contraindication to nonoperative management of intraperitoneal solid organ injury, based upon failures in early experiences of nonoperative therapy. Refinements in the criteria for nonoperative management of hepatic and splenic injuries have yielded improved success rates compared with those in initial reports, raising questions as to the validity of an age-related contraindication. A retrospective chart review of patients more than 55 years of age sustaining blunt hepatic and/or splenic injury at two urban Level I trauma centers was performed. Patients were stratified into three groups in which selection criteria could not consistently be determined: those managed nonoperatively, those managed operatively, and those who died within 24 hours. The purpose of this review is to identify whether age is a determinant for nonoperative management of abdominal solid organ injury. Eighty-eight patients were identified (mean age, 68.7 +/- 9.8), 17 of whom died in the emergency department or after operative intervention. Of the remaining 71 patients, 37 were originally managed nonoperatively (mean age 69.9 +/- 9.1, mean Injury Severity Score 19.9), 24 sustained hepatic injuries (grades I-IV), 12 sustained splenic injuries (grades I-III), and one patient sustained both organ injuries. Three patients with multisystem trauma died from complications unrelated to their solid organ injury (one brain death, one septic death, and one respiratory arrest). A single patient, with a grade I liver injury, required delayed exploration (for a persistent, unexplained metabolic acidosis) and underwent a nontherapeutic celiotomy. All but one of the 37 patients were successfully treated nonoperatively, for a 97 per cent success rate. We conclude that hemodynamically stable patients more than 55 years of age sustaining intra-abdominal injury can be observed safely. Age alone should no longer be considered an exclusion criterion for nonoperative management of intra-abdominal solid organ injury.


Subject(s)
Abdominal Injuries/diagnosis , Abdominal Injuries/therapy , Abdominal Injuries/complications , Abdominal Injuries/mortality , Abdominal Injuries/physiopathology , Abdominal Injuries/surgery , Age Factors , Aged , Aged, 80 and over , Female , Hemodynamics , Humans , Injury Severity Score , Liver/injuries , Male , Medical Records , Middle Aged , Patient Selection , Retroperitoneal Space/injuries , Retrospective Studies , Spleen/injuries , Survival Analysis , Thoracic Injuries/complications , Treatment Outcome
18.
Therapie ; 55(1): 63-9, 2000.
Article in English | MEDLINE | ID: mdl-10860003

ABSTRACT

The cardiovascular system is one of the primary vital functions which have to be examined during safety pharmacology studies. Cardiovascular system functioning is maintained by cardiac electrical activity and by pump-muscle function which contribute to haemodynamic efficacy. The aim of cardiovascular safety pharmacology is to evaluate the effects of test substances on the most pertinent components of this system, in order to detect potentially undesirable effects, before engaging in clinical trials. In the basic programme, a detailed haemodynamic evaluation is carried out in the anaesthetized dog. It is completed by cardiac and/or cellular electrophysiology investigations in order to assess the arrhythmogenic risk. The basic programme can be preceded by rapid and simple testing procedures, during the early drug discovery stage. It should be completed, if necessary, by specific supplementary studies, depending on the data obtained during the early clinical trials. The following article describes and presents an analytic strategy aimed at problems of cardiovascular risk.


Subject(s)
Cardiovascular System/drug effects , Drug-Related Side Effects and Adverse Reactions , Pharmacology, Clinical/methods , Animals , Dogs
19.
Bioorg Med Chem Lett ; 10(8): 805-9, 2000 Apr 17.
Article in English | MEDLINE | ID: mdl-10782691

ABSTRACT

A series of 3-(4-piperidinylthio)-1H-indoles was synthesized and evaluated in mice in the phenylbenzoquinone(PBQ)-induced writhing and hot plate tests. Most of these compounds are good analgesics with activities comparable to that of morphine. Among them compound 1i (UP 237-61), which has a strong serotonin binding profile, has an interesting antinociceptive activity which is not reversed by naloxone.


Subject(s)
Analgesics, Non-Narcotic/pharmacology , Indoles/pharmacology , Administration, Oral , Analgesics, Non-Narcotic/administration & dosage , Animals , Indoles/administration & dosage , Mice
20.
Int J Radiat Oncol Biol Phys ; 45(1): 215-25, 1999 Aug 01.
Article in English | MEDLINE | ID: mdl-10477026

ABSTRACT

PURPOSE: Conventional portal verification requires that a qualified radiation oncologist make decisions as to the set-up acceptability. This scheme is no longer sustainable with the large numbers of images available on-line and stringent time constraints. Therefore the objective of this study was to develop, optimize, and evaluate on clinical data an artificial intelligence decision-making tool for portal verification. The tool, based on the artificial neural network (ANN) approach, should approximate, as closely as possible, portal verification assessments made by a radiation oncologist expert. METHODS AND MATERIALS: A total of 328 electronic portal images of tangential breast irradiations were included in the study. A radiation oncologist expert evaluated these images and rated the treatment set-up acceptability on a scale from 0 to 10. Translational and rotational errors in the placement of the radiation field boundaries formed seven-dimensional feature vectors that represented each of the 328 portal images/treatments. The feature vectors were used as inputs to a three-layer, feedforward ANN. The neural network was trained on the oncologist's ratings. RESULTS: The rms discrepancy between the ANN and the expert's ratings was 1.05 rating points. Using the decision threshold equal to 5 for both sets of ratings, the ANN classifier was capable of detecting 100% of the portals classified as "unacceptable" by the expert. Only 6.5% of portals acceptable to the oncologist were misclassified as "unacceptable" by the ANN. CONCLUSION: The results of this study indicate the feasibility of using the ANN portal image classifier as an automated assistant to the radiation oncologist. Its role would be to recommend an appropriate decision as to the acceptability or otherwise of a given treatment set-up depicted in a portal image.


Subject(s)
Breast Neoplasms/radiotherapy , Neural Networks, Computer , Radiation Oncology/standards , Radiotherapy, Computer-Assisted/standards , Breast Neoplasms/diagnostic imaging , Feasibility Studies , Female , Humans , Observer Variation , Physical Phenomena , Physics , Radiography , Sensitivity and Specificity
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