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1.
Rev Med Interne ; 44(1): 5-11, 2023 Jan.
Article in French | MEDLINE | ID: mdl-35934597

ABSTRACT

INTRODUCTION: Before attending residency, 6th-year French medical students must validate a final examination including a practical clinical test in their faculty. However, the national ranking that determines their future specialty and region solely relies on a computerized knowledge test. Our goal was to investigate the association between the final faculty test and the national ranking test. METHODS: In our faculty, the final examination includes a computerized theoretical test (similar to the national one) and a practical test: a standardized evaluation of semiology skills at the bedside and a standardized assessment of relational skills with role plays. The agreements between the national test and faculty computerized and practical tests were analyzed by intraclass correlation coefficients (ICC). RESULTS: Data from 1806 students who underwent the three examinations from 2017 to 2021 were analyzed. There was a good agreement between the ranks in the faculty and national computerized tests: ICC 0.83 (95% CI 0.81-0.85). By contrast, the agreement between the ranks in the faculty practical test and the national computerized test was poor: ICC 0.13 (95% CI 0.08-0.17). Results were stable over the years. CONCLUSION: The agreement between the ranking of the current national test and the clinical skills assessed by a specific faculty test is poor. This could relate to a true independence or to different levels of motivation to perform well. Indeed, the result of the national test is the most important one as it determines their career. Incorporating a clinical assessment into the national ranking test will motivate students to acquire clinical skills and value those who perform well this practical dimension.


Subject(s)
Educational Measurement , Students, Medical , Humans , Educational Measurement/methods , Retrospective Studies , Physical Examination , Clinical Competence , Faculty, Medical
2.
Ethics Med Public Health ; 18: 100659, 2021 Sep.
Article in English | MEDLINE | ID: mdl-34493984

ABSTRACT

The concomitance of a migratory wave and the hospital crisis once again raises the question of the care that the French healthcare system is able to provide to migrants. On the occasion of SFFEM's 19th annual day, we present a synthesis of the research work that has been communicated at that time. Firstly, we will discuss how doctors have been able to overcome strangeness to revive the notion of hospitality according to Levinas; secondly, we will discuss how the hospital is departing from its mission of institutional hospitality because of administrative injunctions; thirdly, we will discuss how ethnomedicine gives us keys to open up to other cultural norms; fourthly, we will see the inadequacy that exists between rights of access to medical care and their effectiveness; finally, the conclusion of Xavier Emmanuelli, founder of the social ambulance service, will remind us how much the values of the French Republic call us to the notion of care and openness to otherness.

3.
Rev Med Interne ; 42(5): 302-309, 2021 May.
Article in English | MEDLINE | ID: mdl-33518414

ABSTRACT

INTRODUCTION: In France, at the end of the sixth year of medical studies, students take a national ranking examination including progressive clinical case-based multiple-choice questions (MCQs). We aimed to evaluate the ability of these MCQs for testing higher-order thinking more than knowledge recall, and to identify their characteristics associated with success and discrimination. METHODS: We analysed the 72 progressive clinical cases taken by the students in the years 2016-2019, through an online platform. RESULTS: A total of 72 progressive clinical cases (18 for each of the 4 studied years), corresponding to 1059 questions, were analysed. Most of the clinical cases (n=43, 60%) had 15 questions. Clinical questions represented 89% of all questions, whereas basic sciences questions accounted for 9%. The most frequent medical subspecialties were internal medicine (n=90, 8%) and infectious diseases (n=88, 8%). The most frequent question types concerned therapeutics (26%), exams (19%), diagnosis (14%), and semiology (13%). Level 2 questions ("understand and apply") accounted for 59% of all questions according to the Bloom's taxonomy. The level of Bloom's taxonomy significantly changed over time with a decreasing number of level 1 questions ("remember") (P=0.04). We also analysed the results of the students among 853 questions of training ECNi. Success and discrimination significantly decreased when the number of correct answers increased (P<0.0001 both). The success, discrimination, mean score, and mean number of discrepancies did not differ according to the diagnosis, exam, imaging, semiology, or therapeutic type of questions. CONCLUSION: Progressive clinical case-based MCQs represent an innovative way to evaluate undergraduate students.


Subject(s)
Students, Medical , Educational Measurement , France/epidemiology , Humans
4.
Rev Med Interne ; 42(4): 243-250, 2021 Apr.
Article in English | MEDLINE | ID: mdl-33288231

ABSTRACT

INTRODUCTION: Script concordance tests (SCTs) have been developed to assess clinical reasoning in uncertain situations. Their reliability for the evaluation of undergraduate medical students has not been evaluated. METHODS: Twenty internal medicine SCT cases were implemented in undergraduate students of two programs. The results obtained on the SCTs were compared to those obtained by the same students on clinical-based classical multiple-choice questions (MCQs). RESULTS: A total of 551/883 students (62%) answered the SCTs. The mean aggregate score (based on a total 20 points) was 11.54 (3.29). The success rate and mean score for each question did not differ depending on the modal response but the discrimination rate did. The results obtained by the students on the SCT test correlated with their scores on the MCQ tests. Among students, 446/517 (86%) considered the SCTs to be more difficult than classical MCQs, although the mean score did not differ between the SCT and MCQ tests. CONCLUSION: The use of SCTs is a feasible option for the evaluation of undergraduate students. The SCT scores correlated with those obtained on classical MCQ tests.


Subject(s)
Education, Medical, Undergraduate , Educational Measurement , Clinical Competence , Humans , Internal Medicine , Reproducibility of Results , Students, Medical
5.
Ann Intensive Care ; 6(1): 60, 2016 Dec.
Article in English | MEDLINE | ID: mdl-27389016

ABSTRACT

OBJECTIVE: Simulation-based teaching offers promising and diverse teaching possibilities. We aim to assess whether the death of the manikin increased anxiety amongst learner compared to similar simulation-based course where the manikin stays alive. METHODS: We conducted a cluster randomized study amongst multidisciplinary teams of emergency workers. Teams of physicians, nurses, and healthcare assistants were randomly assigned to participate in a simulation-based course where the simulated patient died (death group) or not (life group). We assessed anxiety at 1 month after the teaching using Spielberger STAI-state anxiety questionnaire. We compared reduction of anxiety when facing a life-threatening situation in both groups. RESULTS: We included 25 teams for a total of 129 participants. We analysed 63 participants in the death group and 57 in the life group. Baseline characteristics were similar in both groups, including baseline anxiety (STAI-state score 39.6 (7.8) in the death group vs 38.6 (7.1) in the life group). We report a significant reduction in both groups 1 month after the training: 6.6 (7.8) vs 6 (8.0), mean difference 0.5 (-2.4; 3.4). At 3 months, we report a significant greater reduction of anxiety in the death group (mean difference 4 [0.1; 7.9]). CONCLUSION: We observed in our sample that unexpected simulated patient death did not increase anxiety amongst multidisciplinary emergency workers.

6.
Rev Neurol (Paris) ; 172(4-5): 289-94, 2016.
Article in English | MEDLINE | ID: mdl-27062294

ABSTRACT

INTRODUCTION: Neurological disorders are frequently being managed by general practitioners. It is therefore critical that future physicians become comfortable with neurological examination and physical diagnosis. Graduating medical students often consider neurological examination as one of the clinical skills they are least comfortable with, and they even tend to be neurophobic. One way to improve the learning of neurological semiology is to design innovative learner-friendly educational methods, including simulation training. METHODS: The feasibility of mime-based roleplaying was tested by a simulation training program in neurological semiology called 'The Move'. The program was proposed to third-year medical students at Pierre and Marie Curie University in Paris during their neurology rotation. Students were trained to roleplay patients by miming various neurological syndromes (pyramidal, vestibular, cerebellar, parkinsonian) as well as distal axonopathy, chorea and tonic-clonic seizures. Using an anonymous self-administered questionnaire, the students' and teachers' emotional experience and views on the impact of the program were then investigated. RESULTS: A total of 223/365 students (61%) chose to participate in the study. Both students and teachers felt their participation was pleasant. Students stated that The Move increased their motivation to learn neurological semiology (78%), and improved both their understanding of the subject (77%) and their long-term memorization of the teaching content (86%). Although only a minority thought The Move was likely to improve their performance on their final medical examination (32%), a clear majority (77%) thought it would be useful for their future clinical practice. Both students (87%) and teachers (95%) thought The Move should be included in the medical curriculum. CONCLUSION: Mime-based roleplaying simulation may be a valuable tool for training medical students in neurological semiology, and may also help them to overcome neurophobia.


Subject(s)
Education, Medical/methods , Faculty, Medical/psychology , Neurology/education , Perception , Simulation Training/methods , Students, Medical/psychology , Adult , Attitude of Health Personnel , Curriculum , Feasibility Studies , Female , Humans , Inventions , Male , Patient Simulation , Professional Role/psychology , Role , Surveys and Questionnaires , Young Adult
7.
Arch Pediatr ; 23(2): 150-8, 2016 Feb.
Article in French | MEDLINE | ID: mdl-26774839

ABSTRACT

BACKGROUND: Medical schools aim to prepare medical students for their residency responsibilities. However, in France, there is no assessment of medical students' skills when they start their residency. GOAL: The objective of this study was to assess the quality of basic life support delivered by first-year residents in pediatrics during a simulated pediatric cardiopulmonary arrest. MATERIALS AND METHODS: First-year residents in pediatrics were assessed during a simulated pediatric cardiopulmonary arrest. Their performance score (based on adherence to international guidelines) and no-flow and no-blow fractions were recorded. RESULTS: Forty-two first-year residents were evaluated. Their median performance score was 4 out of 13. No-blow and no-flow fractions were 55 and 81 %, respectively. There was no correlation between their skills and their knowledge assessed during the national ranking exam at the end of the 6th year of medical school. CONCLUSION: At the beginning of their residency, pediatric residents are not able to properly provide basic life support. The introduction of simulation in French medical schools may be an effective way to improve their skills.


Subject(s)
Cardiopulmonary Resuscitation/education , Cardiopulmonary Resuscitation/standards , Clinical Competence , Heart Arrest/therapy , Internship and Residency , Pediatrics/education , Female , France , Humans , Male , Manikins , Surveys and Questionnaires
8.
Eur J Health Law ; 23(5): 470-80, 2016 Dec.
Article in English | MEDLINE | ID: mdl-29210247

ABSTRACT

France is faced with an ageing migrant population, and in the institutions for elderly, migrants represent only 4% and very few come from the Maghreb. Is it the result of a kind of discrimination or of other factors such as culture and traditions? In France migrants have access to aid and prevention of dependency plans. The reluctance to enter into institutions is maintained by the fear of cultural abuse and/or language barriers, and difficulties in financial and administrative matters. From the interviews of the MATC survey, we have pointed out the importance of culture and the tradition of filial piety. Nevertheless, solidarity in the family is decreasing but remains the basis of the care support to the elderly. The will to keep them in the family may limit both the diagnosis and the access to specific care. This attitude contributes to a kind of self-discrimination.


Subject(s)
Emigrants and Immigrants/legislation & jurisprudence , Health Services Accessibility/legislation & jurisprudence , Transients and Migrants/legislation & jurisprudence , Africa, Northern/ethnology , Aged , France , Humans
11.
Rev Mal Respir ; 27(8): 855-73, 2010 Oct.
Article in French | MEDLINE | ID: mdl-20965401

ABSTRACT

Chronic obstructive pulmonary disease (COPD) is a chronic disease characterized by incompletely reversible airflow limitation, measured by a decrease of FEV(1)/FVC ratio. International consensus does not agree on a single threshold for this ratio, which can define airflow obstruction. Although the prevalence of COPD in the elderly population varies according to the definition used, it definitely increases with age and could reach 15% in those over 65 years of age. Therefore, ageing of the population should result in increased prevalence and socioeconomical costs of COPD during coming years. In France, diagnosis of COPD in the elderly is difficult, late and insufficient. Management, which has the same goals as in younger populations, has to be global and coordinated. Some points should be considered with particular attention considering the cumulative risks related on the one hand to COPD and on the other to ageing: pharmacological side-effects, decreased physical and social autonomy, nutritional impairment, comorbidities. Given the lack of specific data in elderly populations, pharmacological indications are generally considered to be the same as in younger populations, but some additional precautionary measures are necessary. Pulmonary rehabilitation seems to be beneficial at any age. Palliative care comes up against important difficulties: an indefinite beginning of the palliative stage in COPD; insufficient palliative care resources; insufficient communication; insufficient utilization of palliative care resources. Global COPD management in elderly requires coordination, best reached in health care network organizations involving medical and/or social professionals.


Subject(s)
Pulmonary Disease, Chronic Obstructive , Age Factors , Aged , Aged, 80 and over , Cardiovascular Diseases/epidemiology , Case Management , Comorbidity , Depression/epidemiology , Depression/etiology , Drug Interactions , France/epidemiology , Humans , Malnutrition/epidemiology , Malnutrition/prevention & control , Palliative Care , Patient Care Team , Patient Education as Topic , Prevalence , Pulmonary Disease, Chronic Obstructive/diagnosis , Pulmonary Disease, Chronic Obstructive/drug therapy , Pulmonary Disease, Chronic Obstructive/epidemiology , Pulmonary Disease, Chronic Obstructive/psychology , Pulmonary Disease, Chronic Obstructive/rehabilitation , Respiratory System Agents/adverse effects , Respiratory System Agents/therapeutic use , Risk
12.
J Int Bioethique ; 21(4): 93-101, 162-3, 2010 Dec.
Article in French | MEDLINE | ID: mdl-21766725

ABSTRACT

Every code of ethics of health professionals in France considers the respect of dignity as a fundamental duty. The French 2002 Law on patient rights says that the person has the right to respect of dignity and of private life. After a presentation of the articles of ethics codes regarding dignity, this paper presents recommendations to deliver medical care in situations where dignity might be endangered such as for patients hospitalized in psychiatric services without consent, or for medical examination of prisoners or medical care to vulnerable patients unable to express their will, especially in palliative care or at the end of life. Respect of dignity after death is illustrated by the reflection conducted by the Espace Ethique de l'AP-HP (Paris area hospitals) and in the Chart of the mortuary yard. A survey of the patients' letters of complaint received by the emergency service of the Toulouse University Hospital showed that, in five years, there were 188 letters and 18 pointed out infringements to the dignity of the person. The health professional team is now aware of this obligation, and in the accreditation of the hospitals, the respect of dignity is one of the indicators of the quality of medical care.


Subject(s)
Inpatients , Patient Rights/legislation & jurisprudence , Personhood , Humans , Informed Consent , Personal Autonomy , Quality Assurance, Health Care
13.
Rev Epidemiol Sante Publique ; 57(4): 231-9, 2009 Aug.
Article in French | MEDLINE | ID: mdl-19540684

ABSTRACT

BACKGROUND: French and Quebec legislation allow the inclusion of decisionally-incompetent subjects in research, provided certain conditions are met. In both jurisdictions, ethics committees are charged with ensuring that research protocols meet these conditions. We investigated committee members' knowledge and opinions regarding substitute consent for research purposes. METHODS: Two consecutive postal surveys were conducted among all members of ethics committees from France and Quebec. Knowledge and opinions about proxy consent were measured with clinical vignettes describing hypothetical situations involving incapable adults. For each vignette, respondents were asked to either identify the person legally authorized to consent or choose the substitute decision-maker whom they considered best suited to do so. RESULTS: Knowledge of the legislation governing substitute consent was poor in both samples, especially in situations involving an incompetent person who did not have a legal representative. Knowledge was worse among French ethics committee members (p<0.001). In hypothetical clinical studies that involved no risk to the subject's health, 59% of respondents favored consent from a close relative. As the risk increased, the proportion gradually decreased to 14.2%, while the proportion against soliciting the cognitively impaired older adult tended to increase (from 5.8 to 31.2%). These trends were observed in both samples. CONCLUSION: These findings underscore the need to better educate ethics committee members about legislation regarding prospective subjects who lack decisional capacity. Such efforts could improve both knowledge of and compliance with legal provisions that enable or restrict the participation of cognitively-impaired patients in research projects. Moreover, study findings provide some support for enlarging the category of persons who are authorized to consent to low-risk research on behalf of incapacitated adults who lack legal representation.


Subject(s)
Ethics Committees, Research , Informed Consent/legislation & jurisprudence , Professional Competence , Adult , Female , France , Humans , Male , Mental Competency/legislation & jurisprudence , Middle Aged , Quebec , Research Subjects/legislation & jurisprudence , Surveys and Questionnaires
14.
Eur Respir J ; 34(2): 365-70, 2009 Aug.
Article in English | MEDLINE | ID: mdl-19251778

ABSTRACT

High cervical spinal cord injuries induce extreme handicap and tactile isolation. Tracheotomised tetraplegic patients are also bound to be olfaction deprived. By restoring negative pressure inspiration, diaphragm pacing (DP) should improve olfaction. We tested olfaction in 10 consecutive tetraplegics during positive pressure mechanical ventilation and DP, using the University of Pennsylvania Smell Identification Test (UPSIT). Quality of life was assessed using the Satisfaction with Life Scale (SWLS). Self-perceived benefits of DP were studied using an in-house questionnaire. Olfaction was very poor during positive pressure mechanical ventilation (UPSIT, mean+/-SD 17.1+/-6.4, anosmia or severe microsmia). It improved during DP (35.2+/-1.9, normosmia or mild microsmia; p<0.0001) and SWLS was 18.5+/-4.2. Nine patients stated that DP had improved their quality of life. This was driven by better mobility (ranked first), improved self-image and relationships with others (ranked second), improved olfaction and better feeling of security (both ranked third). Improved olfaction is among the benefits of DP and should be mentioned to patients considered for this therapy. Furthermore, attention to olfaction is warranted in tracheotomised ventilator-dependent patients, as a putative path towards improvement of quality of life.


Subject(s)
Diaphragm/physiopathology , Quadriplegia/physiopathology , Quadriplegia/rehabilitation , Smell , Adult , Electric Stimulation Therapy/methods , Female , Humans , Male , Middle Aged , Phrenic Nerve/physiopathology , Pressure , Quality of Life , Respiration, Artificial , Surveys and Questionnaires
16.
Rev Sci Instrum ; 78(1): 013108, 2007 Jan.
Article in English | MEDLINE | ID: mdl-17503908

ABSTRACT

We describe new developments aimed to extend the capabilities and the sensitivity of the (e,2e)(e,3e) multicoincidence spectrometer at Orsay University [Duguet et al., Rev. Sci. Instrum. 69, 3524 (1998)]. The spectrometer has been improved by the addition of a third multiangle detection channel for the fast "scattered" electron. The present system is unique in that it is the only system which combines three toroidal analyzers all equipped with position sensitive detectors, thus allowing the triple coincidence detection of the three electrons present in the final state of an electron impact double ionization process. The setup allows measurement of the angular and energy distributions of the ejected electrons over almost the totality of the collision plane as well as that of the scattered electron over a large range of scattering angles in the forward direction. The resulting gain in sensitivity ( approximately 25) has rendered feasible a whole class of experiments which could not be otherwise envisaged. The setup is described with a special emphasis on the new toroidal analyzer, data acquisition hardware, and data analysis procedures. The performances are illustrated by selected results of (e,2e) and (e,3e) experiments on the rare gases.


Subject(s)
Electrons , Scattering, Radiation
17.
Neurology ; 67(2): 288-92, 2006 Jul 25.
Article in English | MEDLINE | ID: mdl-16864822

ABSTRACT

OBJECTIVE: To assess the value of the diaphragmatic response to transcranial magnetic stimulation (TMS) in predicting the recovery of ventilatory activity after CNS lesions responsible for central respiratory paralysis. METHODS: The authors studied 11 long-term ventilator-dependent patients with central respiratory paralysis (description group: spinal trauma 10, medullary ischemia 1) and 16 patients with central respiratory paralysis for less than 10 weeks (prognostic group, evaluated after a 1-year follow-up: spinal trauma 8, medullary ischemia 4, radiation myelitis 1, subdural hematoma 1, complication of neurosurgery 2). RESULTS: In the description group, all the patients had a bilaterally abolished diaphragm response. In the prognostic group, six patients were fully ventilator dependent because of a complete absence of ventilatory activity at follow-up time. They lacked any diaphragm response. The 10 other patients had recovered ventilatory activity and full (n = 9) or partial (n = 1) ventilatory autonomy. In nine cases, diaphragm response was present at least on one side, with a normal latency (right: 15.6 +/- 1.5 milliseconds; left: 16.2 +/- 2.2 milliseconds). The test had 100% specificity (95% CI 52 to 100) and 90% sensitivity (95% CI 54 to 99) to predict the recovery of ventilatory activity. CONCLUSION: Electrophysiologic studies of the diaphragm in response to transcranial magnetic stimulation may help predict the recovery of central respiratory paralysis within 1 year.


Subject(s)
Central Nervous System Diseases/epidemiology , Outcome Assessment, Health Care/methods , Pulmonary Ventilation , Recovery of Function , Respiration, Artificial/statistics & numerical data , Respiratory Paralysis/epidemiology , Respiratory Paralysis/therapy , Adolescent , Adult , Causality , Central Nervous System Diseases/therapy , Child , Comorbidity , Female , France/epidemiology , Humans , Male , Middle Aged , Prognosis , Reproducibility of Results , Sensitivity and Specificity , Transcranial Magnetic Stimulation/statistics & numerical data , Treatment Outcome , Ventilator Weaning/statistics & numerical data
18.
Eur Respir J ; 27(6): 1236-43, 2006 Jun.
Article in English | MEDLINE | ID: mdl-16481386

ABSTRACT

The home ventilator market has grown in size and complexity. The aim of this study was to determine if common home ventilators are user-friendly for trained intensive care unit (ICU) physicians. Eleven ventilator models were tested by 13 ICU physicians without practical experience in home mechanical ventilation. Six tests were defined (start-up, unlocking, mode and setting recognition, mode change, pressure setting and alarm). For each test, the physicians were timed and their performance compared with a reference time established by a technician. The physicians also had to rate their global assessment of each machine on a visual analogue scale. The start-up test was the only test for which there was no significant difference between the physicians and the technician, except for two ventilators. The physicians were slower than the technician to unlock the ventilator and change the ventilatory mode, with some complete failures during these tests and heterogeneous results between physicians and between ventilators. Mistakes occurred in close to 50% of cases during the ventilatory mode and settings recognition test. The mean time for the most rapid of the physicians for all the tests was 58+/-53 s, compared with 15+/-9 s for the technician. In conclusion, trained intensive care unit physicians perform poorly when confronted with home mechanical ventilators without specific prior training. Therefore, it is hypothesised that the user-friendliness of home ventilators for other categories of users might be questionable.


Subject(s)
Home Care Services , Technology Assessment, Biomedical , Ventilators, Mechanical/standards , Attitude of Health Personnel , Benchmarking/standards , Equipment Design/standards , Equipment Safety/standards , France , Humans , Intensive Care Units , Time and Motion Studies , User-Computer Interface
19.
Rev Mal Respir ; 22(5 Pt 1): 731-7, 2005 Nov.
Article in French | MEDLINE | ID: mdl-16272975

ABSTRACT

BACKGROUND: Ventilation via a tracheostomy is effective but very restricting in patients with neuromuscular disease. Return to non-invasive ventilation (NIV) is possible but this is not common practice, partly for want of standardised procedures ensuring a safe transition. METHODS: A procedure for transfer of ventilation via a tracheostomy to a mask has been developed based on the literature and local experience (feasibility of NIV, absence of laryngo-tracheal lesions, adequate leak compensation, effective cough). It has been tested in three patients with severe but stable neuromuscular disorders (chronic polyneuropathy in two cases and progressive spinal amyotrophy on one). RESULTS: The three patients were able to be extubated and established on domiciliary ventilation in 6,7 and 10 days, at the end of which all were discharged home. After 4 months in two cases and 6 months in the other no significant complications developed, the respiratory status under NIV was comparable to that previously under tracheostomy and the patients were satisfied with the change. CONCLUSION: The proposed algorithm seems to permit a rapid and safe transition from a tracheostomy to a mask. Large scale studies are needed to verify this concept and subsequently to identify within which group a similar approach may be correctly applied.


Subject(s)
Neuromuscular Diseases/complications , Respiration, Artificial , Respiratory Insufficiency/therapy , Tracheostomy , Adult , Algorithms , Female , Humans , Laryngeal Masks , Male , Middle Aged , Respiratory Insufficiency/etiology
20.
Acta Biotheor ; 52(4): 241-54, 2004.
Article in English | MEDLINE | ID: mdl-15520532

ABSTRACT

Expiratory flow limitation (EFL) can occur in mechanically ventilated patients with chronic obstructive pulmonary disease and other disorders. It leads to dynamic hyperinflation with ensuing deleterious consequences. Detecting EFL is thus clinically relevant. Easily applicable methods however lack this detection being routinely made in intensive care. Using a simple mathematical model, we propose a new method to detect EFL that does not require any intervention or modification of the ongoing therapeutic. The model consists in a monoalveolar representation of the respiratory system, including a collapsible airway that is submitted to periodic changes in pressure at the airway opening: EFL provokes a sharp expiratory increase in the resistance Rc of the collapsible airway. The model parameters were identified via the Levenberg-Marquardt method by fitting simulated data on the airway pressure and the flow signals recorded in 10 mechanically ventilated patients. A sensitivity study demonstrated that only 8/11 parameters needed to be identified, the remaining three being given reasonable physiological values. Flow-volume curves built at different levels of positive expiratory pressure, PEEP, during "PEEP trials" (stepwise increases in positive end-expiratory pressure to optimize ventilator settings) have shown evidence of EFL in three cases. This was concordant with parameter identification (high Rc during expiration for EFL patients). We conclude from these preliminary results that our model is a potential tool for the non-invasive detection of EFL in mechanically ventilated patients.


Subject(s)
Forced Expiratory Flow Rates , Nonlinear Dynamics , Respiration, Artificial , Adult , Aged , Aged, 80 and over , Humans , Middle Aged , Models, Theoretical
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