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עמוד בית
Sat, 20.07.24

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August 2006
A. Primov-Fever, Y.P. Talmi, A. Yellin and M. Wolf
 Background: Intubation and tracheostomy are the most common causes of benign acquired airway stenosis. Management varies according to different conceptions and techniques.

Objectives: To review our experience with cricotracheal resection and to assess related pitfalls and complications.

Methods: We examined the records of all patients who underwent CTR[1] in a tertiary referral medical center during the period January 1995 to April 2005.

Results: The study included 61 patients (16 women and 45 men) aged 15–81 years. In 17 patients previous interventions had failed, mostly dilatation and T-tube insertion. Complete obstruction was noted in 19 patients and stenosis > 70% in 26. Concomitant lesions included impaired vocal cord mobility (n=8) and tracheo-esophageal fistula (n=5). Cricotracheal anastomosis was performed in 42 patients, thyrotracheal in 12 and tracheotracheal in 7. A staged procedure was planned for quadriplegic patients and for three others with bilateral impaired vocal cord mobility. Restenosis occurred in six patients who were immediately revised with T-tube stenting. Decanulation was eventually achieved in 57 patients (93.4%). Complications occurred in 25 patients, the most common being subcutaneous emphysema (n=5). One patient died of acute myocardial infarction on the 14th postoperative day.

Conclusions: CTR is a relatively safe procedure with a high success rate in primary and revised procedures. A staged procedure should be planned in specific situations, namely, quadriplegics and patients with bilateral impaired vocal cord mobility. 


 





[1] CTR = cricotracheal resection


E. Leibovitz, Y. Gerber, M. Maislos, E. Wolfovitz, T. Chajek-Shaul, E. Leitersdorf, U. Goldbourt and D. Harats for the HOLEM study group
 Background: Obesity is an independent risk factor for ischemic heart disease and affects the status of other risk factors for cardiovascular disease.

Objective: To study the attitude of physicians to obesity by examining discharge letters of overweight patients with ischemic heart disease.

Methods: We used the HOLEM database for this analysis. The HOLEM project was designed to study the NCEP (National Cholesterol Education Program) guideline implementation among patients with IHD[1] at hospital discharge. We documented the recording of risk factors and treatment recommendations for IHD by reviewing the discharge letters of 2994 IHD patients admitted to four central hospitals in Israel between 1998 and 2000. A follow-up visit was held 6–8 weeks after discharge, at which time the diagnosis of IHD was verified, risk factor status was checked, height and weight were measured and drug treatment was reviewed.

Results: Mean body mass index was 28.3 kg/m2 and 32% were obese (BMI[2] ³ 30 kg/m2). Only 39.6% of the obese patients and 65.8% of the morbidly obese patients (BMI ³ 40 kg/m2) had "obesity" noted in their discharging letters, and weight loss recommendation was written in only 15% of the obese patients' discharge letters. Acute episodes like acute myocardial infarction and unstable angina did not influence the notation of obesity, and only BMI and the number of additional risk factors were positively correlated with the notation of this risk factor.

Conclusions: Despite the importance of obesity, weight status was not noted and weight loss was not recommended in most of the discharge letters of obese IHD patients.


 





[1] IHD = ischemic heart disease

[2] BMI = body mass index


D.A. Vardy, T. Freud, P. Shvartzman, M. Sherf, O. Spilberg, D. Goldfarb and S. Mor-Yosef
 Background: Full medical coverage may often result in overuse. Cost-sharing and the introduction of a co-payment have been shown to cause a reduction in the use of medical services.

Objectives: To assess the effects of the recently introduced co-payment for consultant specialist services on patients' utilization of these services in southern Israel.

Methods: Computerized utilization data on specialists' services for 6 months before and 6 months after initiation of co-payment were retrieved from the database of Israel's largest health management organization.

Results: A decrease of 4.5% was found in the total number of visits to Soroka Medical Center outpatient clinics and of 6.8% to community-based consultants. An increase of 20.1% was noted in the number of non-actualized visits at the outpatient clinics. A decrease of 6.2% in new visits was found in the hospital outpatient clinics and of 6.5% in community clinics. A logistic regression model showed that the residents of development towns and people aged 75+ and 12–34 were more likely not to keep a prescheduled appointment.

Conclusion: After introduction of a modest co-payment, a decrease in the total number of visits to specialists with an increase in "no-shows" was observed. The logistic regression model suggests that people of lower socioeconomic status are more likely not to keep a prescheduled appointment.

Z. Kaufman, G. Aharonowitz, R. Dichtiar and M.S. Green
Background: Early clinical signs of influenza caused by a pandemic strain will presumably not differ significantly from those caused by other respiratory viruses. Similarly, early signs of diseases that may result from bioterrorism are frequently non-specific and resemble those of influenza-like illness. Since the time window for effective intervention is narrow, treatment may need to be initiated prior to a definitive diagnosis. Consequently, planning of medications, manpower and facilities should also account for those who would be treated for an unrelated acute illness.

Objectives: To estimate usual patterns of acute illness in the community as a baseline for integration into pandemic influenza and bioterrorism preparedness plans.

Methods: Between 2000 and 2003 we conducted 13 telephone surveys to estimate the usual incidence and prevalence of symptoms of acute illness in the community.

Results: On average, 910 households were included in each of the surveys, representing about 3000 people. The compliance rates for full interviews ranged from 72.3% to 86.0%. In winter, on average, about 2% of the Israeli population (individuals) suffered each day from fever of ≥ 38ºC, and about 0.8% during the other months. The prevalence of cough was higher, 9.2% in winter and 3% during summer. Daily incidence of fever ranged from about 0.4% per day in winter to about 0.2% in the fall. The prevalence and incidence of both fever and cough were highest for infants followed by children aged 1–5 years.

Conclusions: These background morbidity estimates can be used for planning the overall treatment requirements, in addition to actual cases, resulting from pandemic influenza or a bioterrorist incident.

I. Goldberg Cohen, G. Beck, A. Ziskind and J. Itskovitz-Eldor
 Embryonic stem cells, derived from the inner cell mass of embryos in the blastocyst stage, are cells capable of perpetual self-renewal and long-term propagation and hold the potential to differentiate to progeny of the three embryonic germ layers. Since their derivation approximately two decades ago, exploration of mouse ES cells made major advances in ES cell differentiation research and in the successful development and propagation of various cell types. The subsequent derivation of ES cells from human embryos allows detailed study of early developmental events practically unreachable in early human embryos, and the potential derivation of a variety of adult cell types differentiated from the ES cells holds immense therapeutic promise. Recently, the study of ES cell-derived teratomas identified the partial presence of human ES cell-derived premature vessels within the teratoma, and a preliminary protocol for the in vitro derivation of a vascular progenitor was developed based on the study with the mouse ES cells. Furthermore, genetic profiling identified a pattern of expression of various endothelial and vascular smooth muscle cell genes that provide additional Information on the degree of vascular development that ES cells undergo. Finally, the clinical application of ES cells in transplantation medicine is closer than ever following the affirmation that human ES cell-derived endothelial progenitors conferred increased neovascularization in transplanted engineered skeletal muscle. This review summarizes these recent advances in vascular development from human ES cells and their potential clinical applications.

A. Bar-Gil Shitrit, C. Reinus, S. Zeides and D. Braverman
July 2006
H. Liss
 Background: A publication bias exists towards positive results in studies funded by pharmaceutical companies.

Objectives: To determine whether drug studies in the pulmonary/allergy literature also demonstrate a publication bias towards more favorable results when a pharmaceutical company funds the study.

Methods: We reviewed all original articles published in seven pulmonary and allergy journals between October 2002 and September 2003. Included in the review were studies of inhaled corticosteroids (oral or nasal), long- or short-acting bronchodilators, or leukotriene receptor antagonists. Articles with funding from a pharmaceutical company and/or one or more authors employed by a pharmaceutical company were considered pharmaceutical company-sponsored studies. The remaining studies were considered not sponsored by a pharmaceutical company. Results were compared to ascertain whether positive results were obtained more frequently in the company-sponsored studies.

Results: Of the 100 articles included in this review 63 were considered pharmaceutical company-sponsored research. Results favorable for the drugs studies were significantly more common in those funded by a pharmaceutical company (98% vs. 32%).

Conclusions: In the pulmonary and allergy literature, as in other fields, there is a publication bias towards positive results in pharmaceutical company-sponsored research.

D. Starobin, M.R. Kramer, A. Yarmolovsky, D. Bendayan, I. Rosenberg, J. Sulkes and G. Fink
 Background: Different exercise tests are used to evaluate the functional capacity in chronic obstructive pulmonary disease. The cardiopulmonary exercise test is considered the gold standard, but the 6 minute walk and the 15 step exercise oximetry tests are considerably less expensive.

Objectives: To determine whether reliable data could be obtained at lower cost.

Methods: The study sample consisted of 50 patients with mild to severe stable COPD]1[. All underwent pulmonary function test and the cardiopulmonary exercise test, 6 minute walk and 15 step exercise oximetry test as part of their regular follow-up visit. Functional capacity was graded according to each test separately and the functional capacities obtained were correlated.

Results: The results showed that most of the patients had severe COPD according to pulmonary function tests (mean forced expiratory volume in the first second 46.3 ± 19.9% of predicted value). There was a good correlation between the cardiopulmonary exercise test and the 6 minute walk functional capacity classes (r = 0.44, P = 0.0013). We did not find such correlation between the 15 step exercise oximetry test and the cardiopulmonary exercise test (r = 0.07, P = 0.64).

Conclusions: The study shows that the 6 minute walk is a reliable and accurate test in the evaluation of functional capacity in COPD patients.


 





[1] COPD = chronic obstructive pulmonary disease


M. Katz Leurer, E. Be'eri and D. Zilbershtein
 Background: There is a growing demand for respiratory rehabilitation services for children dependent on tracheostomy and/or chronic mechanical ventilation. Discharging these patients home following their rehabilitation can be an arduous process.

Objectives: To define the length of time required to rehabilitate and discharge these patients, and to identify predictors of a prolonged or failed discharge process.

Methods: We conducted a retrospective chart review of patients admitted to the Respiratory Rehabilitation Unit at Alyn Hospital, Jerusalem, over a 4 year period.

Results: Of the 48 patients identified, 31 (64.7%) were eventually discharged, 13 (27.1%) remained hospitalized long-term, and 4 (8.3%) died during their hospitalization. The median length of hospitalization was 10 months: 6 months for purposes of rehabilitation therapy, and 4 months thereafter to resolve the logistics of discharge. Specific family characteristics – an unemployed father (odds ratio = 4.6, P = 0.02) and an additional family member with a disability (OR[1] = 5.8, P = 0.03) – as well as ongoing mechanical ventilation at the time of discharge (OR = 5.5, P < 0.01) were found to positively correlate with a prolonged or failed discharge process.

Conclusions:  Hospitalization in a pediatric respiratory rehabilitation unit may be prolonged for both medical and non-medical reasons, with the process of discharge home being particularly difficult in certain subsets of patients. A proactive discharge policy by hospitals, improved community support services, and legislation defining the rights of home-ventilated children may facilitate more efficient discharge home of these patients.


 





[1] OR = odds ratio


S.W. Moses, M. David, E. Goldhammer, A. Tal and S. Sukenik
D. Rimar, Y. Rimar and Y. Keynan
 Today, more than 10 years and 2000 articles since human herpesvirus 8 was first described by Chang et al., novel insights into the transmission and molecular biology of HHV-8[1] have unveiled a new spectrum of diseases attributed to the virus. The association of HHV-8 with proliferative disorders – including Kaposi's sarcoma, multicentric Castleman disease and primary effusion lymphoma – is well established. Other aspects of HHV-8 infection are currently the subject of accelerated research. Primary HHV-8 infection may manifest as a mononucleosis-like syndrome in the immunocompetent host, or in various forms in the immunocompromised host. The association of HHV-8 with primary pulmonary hypertension was observed by Cool et al. in 2003, but six clinical trials evaluating the role of HHV-8 in pulmonary hypertension have not been able to replicate this intriguing observation. It has been speculated that HHV-8 may secondarily infect proliferating endothelium in patients with pulmonary hypertension. HHV-8 epidemiology, modes of transmission, new spectrum of disease and treatment are presented and discussed.







[1] HHV-8 = human herpesvirus 8


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