תוצאת חיפוש

אלון שמיר וגלית שאלתיאל

מדוע בני אדם שונים זה מזה? מדוע ילדים דומים להוריהם? מדוע אחרים שונים זה מזה? למי מההורים דומה הילד במראהו החיצוני, ברמת המישכל שלו, בתכונותיו האישיות וברגישותו למחלות? שאלות אלו נשאלו, קרוב לוודאי, על ידי כל אחד מאיתנו, ללא מתן תשומת לב לעובדה שהתופעה בה אנו דנים היא למעשה שונות והגורמים לה בתוך המשפחות וביניהן. קיימת שונות שמוסברת אך ורק על בסיס תורשתי (מוטציה בגן A הגורמת לפנוטיפ B), ולעומתה קיימת שונות שמוסברת משונות גנטית ועד שונות הנובעת מהשפעת הסביבה. מחלות המוסברות על בסיס שונות כזו מכונות מחלות רבות-גורמים  (multifactorial diseases).

יורם אפשטיין ומיכה לשם

בשנת 2000 נכללו בישראל בניסויי חיה כ-250,000 בעלי-חיים. מרביתם (כ-85%) היו עכברים וחולדות וכ-11% היו עופות. שאר בעלי החיים, ובהם כ-700 ראשי בקר, כ-300 חזירים, כ-350 כלבים וחתולים ו-30 קופים, היוו כ-4% מכלל בעלי-החיים בניסוי. ההכרה שיש לבצע ניסויים בבעלי-חיים תוך הגבלות מוסריות והתנהגותיות נאותו, הביאה את מרבית המתוקנות שבמדינות לפרסם חוקים והוראות, שמטרתם להבטיח שבעלי-חיים אליהם מתייחסות התקנות יקבלו טיפול נכון, ולא יהיו חשופים לכאב וסבל בלתי-נחוצים.

יהושע (שוקי) שמר (1,2,3), ברכה רגר (1,4)

משרד הבריאות, ישראל (1), המרכז הישראלי להערכת טכנולוגיות בשירותי הבריאות, מכון גרטנר, תל-השומר (2), הפקולטה לרפואה, אוניברסיטת תל-אביב (3), המחלקה למיקרוביולוגיה ואימונולוגיה, הפקולטה למדעי הבריאות, אוניברסיטת בן-גוריון בנגב (4)

מחקר רפואי הוא תהליך שימיו כימי ההיסטוריה המתועדת. כבר לפני שלושת אלפים שנה, הוקדשו מאמצים ואמצעים לרפא מחלות ולגרום לבריאות טובה יותר, אולם רק בשלוש מאות השנים האחרונות, רתם האדם לרשותו את המדע כדי להשיג מטרות אלה ולהבין את מהות המחלות. בחמישים השנים האחרונות, הביא המחקר הרפואי לפריצות דרך שהתבטאו בהארכת תוחלת החיים ובשיפור חיי האדם. אולם, קיימת עדיין שורה ארוכה של מחלות חשוכות מרפא המחייבות להעמיק במחקר ויש צורך בהשקעות ואמצעים כדי להבין את התהוותן, מהלכן ודרך הטיפול בהן. שינויים חברתיים עולמיים מציבים אתגרים חדשים בפני מערכות הבריאות. מחלות זיהומיות כמו איידס או אבולה (ebola), התפרצות מחודשת של מחלת השחפת, העלייה בשיעור חולי הסרטן, העלייה בשכיחות השיטיון (dementia) כתוצאה מהארכת תוחלת החיים והשיעור העולה של נפגעים מנטילת סמים והגברת האלימות בחברה המודרנית, כל אלה, כמו מחלות אחרות, מחייבים הגברה והרחבה של המחקר הרפואי עם תחילת המילניום השלישי.

Sentinel Lymph Node Biopsy in Breast Cancer: A Validation Study and Preliminary Results

Aviram Nissan, Ram M. Spira, Roland Chisin, Oded Zamir, Diana Prus, Martin Klein, Mahmoud Badriyyah, Herbert R. Freund

Departments of Surgery. Biophysics and Nuclear Medicine, and Pathology. Hadassah University Hospital Mount Scopus and Hebrew University - Hadassah Medical School, Jerusalem

Introduction: Sentinel lymph node biopsy (SLNB) has been recently proven to be an accurate staging method for breast cancer, replacing axillary lymph node dissection (ALND) in selected cases. We present our initial experience and the process of introduction and implementation of SLNB in a University Hospital setting.

Material and methods: 46 SLNB were performed in 42 consecutive female patients with invasive breast cancer. Treatment included 0.4mCi-2mCi of Tc-99m rhenium colloid injected either 2 hours before surgery (0.4 mCi) or the night before surgery (2 mCi). Four milliliters of Patent Blue V were injected peritumoral 10 minutes prior to skin incision in all patients. Following SLNB all women underwent subsequent ALND. Sentinel nodes were processed both with multiple (10-15) H&E sections and immunohistochemistry with cytokeratin antibodies stain.

Results: Blue dye, isotope or the combination of both identified 43/46 (93%) of the sentinel lymph nodes. ALND was performed only unilaterally in 4 patients with bilateral breast cancer bringing the total evaluable SLNB to 39. In the 39 patients in whom the sentinel node was successfully identified and underwent ALND, the SLNB was true positive (TP) in 17/39 (44%) true negative (TN) in 20/39 (51%) and false negative in 2/39 [(5%), both T2 lesions] with overall accuracy of 95%. In the last 10 cases all sentinel nodes were successfully identified with 70% TP and 30% TN.

Conclusions: Experience with at least 30-40 consecutive cases for safe implementation of SLNB in clinical practice. Specific training and dedication is required for the entire team involved, including surgeons, nuclear medicine physicians and technicians and pathologists.  

ברכה רגר, עדנה סקל*,

*לשכת המדען הראשי, משרד הבריאות, ירושלים

בשלהי המאה העשרים, בד בבד עם ההתפתחות הטכנולוגית האדירה, החלו מתעוררים חששות מהנזקים העלולים ללוות את ההתקדמות המהירה. בעשורים האחרונים מגלים אירגוני "הירוקים" וקבוצות לשמירה על איכות הסביבה, פעילות רבה, שמטרתה לחשוף ולתקן את הנזקים (אם אכן יש כאלה) לפני שיהיה מאוחר מדי. לצרכים אלה מנוצלים כל ערוצי התיקשורת, החל מכינוסים מדעיים וכלה בעיתונות הכתובה ובטלוויזיה.

כינוס מדעי הוא אירוע סגור המיועד לאנשי מקצוע, הנערך לצרכים מקצועיים ולא כתגובה לדעת קהל או ללחצים ציבוריים וברוב המקרים ללא פירסום בתיקשורת. אולם, בשנים האחרונות נפרצה המסגרת, נוצר סדק בחומה המדעית המבוצרת ודעת הקהל מתחילה לקבוע סידרי עדיפויות וקדימויות. כתוצאה מהלחץ הציבורי הוגדל היקף המחקר ומספר הכינוסים שבהם מנסים המדענים וחוקרים לבדוק, לחקור ולאמת אם הפחד מפני הקרינה המגנטית אכן מוצדק ומה מידת הסיכון בהיחשפות לקרינה זו.

ישראל, נמצאת אמנם במקום השנים-עשר במספר הטלפונים הסלולריים לנפש, אולם בו בזמן היא נמצאת במקום הראשון במשך השיחה לנפש וכן במשך השיחות של ילדים. מספר הילדים שכבר בגיל צעיר משתמשים בטלפון נייד גדל והולך ומאחר שלפניהם עוד שנים ארוכות של שימוש במכשיר, דאגת ההורים מהווה תמריץ מוגבר לבחינת הסכנות הטמונות במכשיר הזה.

Long-Term Sequelae of Malignant Tumors in Childhood

N. M. Peretz, H. Goldberg, A. Kuten, I. Meller, E. Krivoi, A. Lorber, L. Bentur, A. Lightman, V. Gorenberg, M. Ben Arush-Weyl

Pediatric Hematology-Oncology Dept., Oncology Center, Pediatric Cardiology Unit, Pulmonology and Gynecology Depts., and Pediatric Endocrinology Unit; Rambam Medical Center and Technion-Israel Institute of Technology, Haifa; and Orthopedic-Oncology Unit, Tel Aviv-Sourasky Medical Center and Tel Aviv University

110 children with malignant diseases (leukemia excepted) who survived 5-20 years (median 9) post-therapy were followed (1996-1998). Median age during follow-up was 15 years (range 5-23). The most common malignancies were brain tumors, lymphoma, retinoblastoma and Wilm's tumor.

The 174 late side-effects included endocrine disorders (19%), cognitive impairment (14%), orthopedic dysfunction (12%), alopecia (12%), dental damage (11%), psychological (8%) and neurological (8%) disturbances, and azoospermia or amenorrhea (5%). There was no cardiac or renal damage and no second malignancy.

29% of side-effects were severe. There was significant reduction in quality of life in 54 (49%), in 27 of whom it was severe enough to require psychological intervention. Treatment of brain tumor caused 98 late side-effects in 28 patients (sequelae-to-patient ratio [SPR] 3.3). Most cognitive, endocrine and neurological disorders, and most cases of alopecia, dental and psychological difficulties were in these patients. There were frequent late complications in those treated for retinoblastoma (SPR 1.8), and bone or soft tissue sarcomas (SPR 0.8). Those treated for Wilm's tumor had few side-effects (SPR 0.4).

Late side effects were most frequent after radiation, reaching as high as SPR 2.4. It averaged only 0.5 in those treated with chemotherapy alone or in combination with surgery.

Reduction of late side-effects in these patients requires using less toxic modalities, as long as cure rate is not compromised. When considering secondary strategies, screening for early detection of late complications would enable immediate solutions, such as hormonal replacement or providing compensating skills for post-treatment disability.
 

Israel Naval Medical Institute: 20 Years of Applied Research, and Future Goals 

Ran Arieli, Avi Shupak

Israel Naval Medical Institute, Medical Corps, Israel Defense Forces

The Israel Naval Medical Institute (INMI) is unique as a research center located in a naval base and having close inter-relations with naval underwater units. It is ideal for applied research, and for mutual exchange of needs and of ideas and instructions.

Factors making this institute so suitable for applied research include: direct personal communication with combat divers, professional naval divers, submariners, civilian recreational divers and professional civilian divers, as well as naval vessel crews prone to seasickness; hyperbaric oxygen therapy is administered in cooperation with a large neighboring hospital.

Close spatial and personal relations with an academic institution (the Technion, with its Faculties of Medicine, Biology and Biophysics) provide a basis for cooperative research which expands research capabilities, and allows access to extensive expertise, instrumentation and equipment. Close ties with physicians who served at the INMI in the past also bring them into this research community.

During their specialization, physicians may spend up to 6 months working with us on a research project. Undergraduate, graduate and post-graduate students may complete their research at our institute with the agreement of their parent academic institutions.

Much of the research can be released to the international community. However, some is classified, serves only internal needs or is not of public interest. The number of published papers has stabilized since 1991 at about 16 a year.

Studies of gas exchange and oxygen toxicity originate mainly in the Hyperbaric Research Unit, research on motion sickness in the Motion Sickness and Human Performance Laboratory, and work on hyperbaric and diving medicine in the Clinical Section of the INMI.
 

Man in a Hot Climate - Early Studies of the Institute of Military Physiology 

Ezra Sohar, Yair Shapiro, Yoram Epstein

Institute of Military Medicine, Medical Corps, Israel Defense Forces and Heller Institute of Medical Research, Sheba Medical Center, Tel Hashomer

In the 1950's many IDF soldiers were hospitalized for heat stroke - about 25% of whom died. Analyzing these cases revealed that commanders misinterpreted human ability to perform in the heat and ignored basic concepts of fluid and electrolyte balance and heat load.

In the early 1960's a series of studies was conducted with regard to soldiers' performance in the heat. The first study (1959), which later became a classic, was conducted during a 21-day march from Eilat to Metula, crossing all climatic zones of Israel. The study was followed by other investigations which approached the issues of voluntary dehydration, fluid consumption vs sweat loss, salt additives, and the effect of heat load on performance.

Based on these early studies, proper regulations were issued to field officers. Over the years, the lessons learned from these studies saved many lives. The number of cases of heat stroke and of other climate-related injuries was dramatically reduced, and performance was enhanced.

Glucosamine Sulfate and Chondroitin Sulfates for Degenerative Joint Disease 

R. Debi, D. Robinson, G. Agar, N. Halperin

Orthopedic Dept., Assaf Harofeh Medical Center, Zrifin

Osteoarthritis results from progressive catabolic loss of cartilage proteoglycans due to imbalance between synthesis and degradation. The availability of glucosamine, an intermediate in mucopolysaccharide synthesis, can be rate-limiting for proteoglycan production in cartilage tissue culture.

57 patients suffering from osteoarthritis of the knee were randomized into a group treated for 4 weeks with daily IV glucosamine sulfate (GS) together with 800 mg chondroitin sulfate, and a placebo group. Knee pain at rest, on movement and on palpation, as well as range of knee motion were then recorded.

In the GS group, there was significant reduction of clinical symptoms (p<0.01), but no significant reduction in the placebo group. Physicians' assessment of tenderness and range of motion were significantly in favor of the GS group (p<0.01). In those treated with glycosamine there were no adverse reactions and no changes in laboratory blood tests.

Employment of Immigrant Russian Physicians 

Nurit Nirel

JDC-Brookdale Institute of Gerontology and Human Development, Jerusalem

This study examined trends in the employment of immigrant physicians from the former Soviet Union. We studied the changes in the proportion of immigrants employed as physicians between 1994 and 1998, job characteristics, positions, professional status, and improvement in employment characteristics, professional status, and in wages due to increased seniority.

The study population consisted of 7,000 physicians who had immigrated to Israel by June 1992 and had applied to the Ministry of Health for medical licensing. Of these, 726 were interviewed in 1994 and in 1998 all 726 were again approached and 84% were interviewed by telephone.

Of those interviewed in 1998, 63% were working as physicians, 21% in another occupation, and 16% were not working at all. Of those with medical licenses, 79% were working as physicians. Of those interviewed in 1994, 93% were still employed as physicians in 1998, and 88% of them had been so employed continuously. As of 1998, 85% of those interviewed had 5 or more years seniority as physicians in Israel, and half had been working for more than 5 years at their current place of employment.

The best predictor-variable for employment as a physician in 1998 was employment as a physician in 1994. The proportions of those employed by a public employer, of those earning monthly salaries, and of those with a tenured position, were greater in 1998 than in 1994.

In 1998, 70% reported being employed in a authorized staff position. Funding for the salaries of 75% of these physicians came from the budget of their place of employment, not from a grant, stipend, or temporary fund for the assistance of immigrants. These proportions increased with seniority. The proportions of specialists (22%) and residents (37%) had increased in 1998 relative to 1994 (when they were 8% and 23% respectively). In addition, since 1994 gross hourly wages had increased with seniority in real terms by more than 100%.

These findings are evidence of work stability and improvement in employment conditions of these immigrant physicians. Further, the 1998 follow-up indicated a trend toward becoming "established" and improvement in professional status. However, it also revealed models of temporary employment, not in compliance with physicians' collective work agreements, a situation that warrants examination. It is also important to examine the implications of the absorption of so many physicians for medical manpower in Israel, and for overall expenditure on health.

Patient Satisfaction and Hospital Services Evaluation by Regular and Private Patients

Sara Carmel, Jonathan Halevy

Dept. of the Sociology of Health, Faculty of Health Sciences, Ben-Gurion University of

the Negev, Beer Sheba; Sha'are Zedek Medical Center and Hebrew University-Hadassah Medical School, Jerusalem

"Sharap" is a private medical service integrated within our public clinic and hospital services. Clients may choose their physician by paying a fee in addition to what their health insurance agency (Kupat Holim) pays for. All other hospital services are supplied to all patients alike. The main purpose of this study was to evaluate the extent to which this declared policy is maintained in practice.

During 5 months in 1997, 198 Sharap patients and 198 regular patients were interviewed in the the general surgery, cardiac surgery, ENT, cardiology, newborn and gynecology wards of this hospital. Both groups were similar in regard to cause of hospitalization, gender, age group (10-year age ranges), and length of hospitalization (at least 24 hours).

Similar levels of satisfaction with hospitalization in general and with the nursing service and with supportive services were found in both groups. However, Sharap patients were more satisfied with their physicians than regular patients (87% vs 74%, respectively). Similar results were also found using indirect measures of satisfaction. About 86% in both groups reported having achieved the goal of improvement in health. A high proportion of respondents from both groups (82% and 88%, respectively) could not distinguish between Sharap and regular patients in the ward. However, a greater proportion of regular patients (35% vs 21%) wanted more extensive explanations from their physicians regarding their treatment.

Sharap patients belonged to higher socio-economic classes than regular patients. Our evaluation indicates that although the Sharap service enables the affluent to choose their preferred physician, resulting in a different doctor-patient relationship, the service does not create a significant feeling of discrimination among hospitalized patients, and does not interfere with the high level of health services available to the public at large.

Multicenter Community-Based Trial of Amlodipine in Hypertension

C. Yosefy, J.R. Viskoper, Y. Leshem, Y. Rav-Hon, G.I. Rosenberg, E. Yaskil

(Representing the 39 Investigators of Project AML-IL-95-001, WHO Collaborative Center for Prevention of CV Diseases) Ben-Gurion University of the Negev, Beer Sheba; Barzilai Medical Center, Ashkelon; Hypertension Clinic, Kupat Holim Afula; Statistics Consulting Unit, Haifa University; and Promedico Ltd., Petah Tikva

The safety and efficacy of Amlodipine (AML) for mild to moderate hypertension was evaluated in a "real life" setting. This open non-comparative trial included 123 men and 143 women (age 30-91 years, mean 59.4). All had sitting diastolic blood pressure (DBP) between 95 and 115 mmHg, confirmed in most by 2 baseline measurements, 2 weeks apart.

Eligible patients were given AML 5 mg daily as add-on or monotherapy and were evaluated 4 weeks later. If DBP was then >90 mmHg, the daily dose was raised to 10 mg; those with <90 mmHg remained on 5 mg. AML was continued for 8 weeks. Other BP-lowering drugs were unchanged.

Of the original 266 patients 22 (8.2%) withdrew due to adverse events (AE), and others were protocol violators, lost to follow-up or withdrew, leaving 211 available for efficacy analysis. In this major group BP was reduced from 165±15/101±4 to 139±11/83±5 after 12 weeks of AML (p<0.05). The reduction was greater in those under 70 years, from 173±12/100±5 to 142±12/80±4 (p<0.05). In those with BMI>30 kg/m², BP decreased from 165±15/101±5 to 140±12/83±5 (p<0.05).

Mean change in heart rate was -1.5 bpm (p<0.05). Mean final AML dose was 5.5 mg/day. The most common AML-related AE requiring cessation of the drug was pedal edema in 2.6% of the 266 patients; in 3.7% it persisted during therapy. Other AE occurring in >1% were dizziness in 1.8%, headache 1.5%, flushing 1.1% and fatigue 1.1%.

We conclude that AML is an effective and well-tolerated antihypertensive suitable for most hypertensive patients.

Pediatric Research in an Office-Setting Network

Zahi Grossman, Ernesto Kahan, Samuel Gross, Shai Ashkenazi, Itamar Shalit

Kupat Holim Maccabi, Tel Aviv; Israel Ambulatory Pediatric Association; Dept. of Family Medicine, Tel Aviv University; and Schneider Children's Medical Center, Petah Tikva

Pediatric care in the community is gradually replacing traditional care in hospitals. Despite that, research activity in the community setting is minimal due to objective difficulties. These are mainly constraints of time, office work and lack of research-supporting logistics. In the past decade, throughout the world, primary physicians interested in research have grouped together and formed research networks. The aim of such networks is to support and promote research in the community.

An Israel Pediatric Research in Office-Setting network (IPROS) was established 2 years ago by the Israel Ambulatory Pediatric Association (IAPA). Today, there are over 140 pediatricians listed in IPROS, representing the heterogeneous composition of pediatricians in Israel. The network's policy is defined by a joint steering committee. The committee is composed of IAPA representatives, senior network members and Schneider Hospital senior investigators. The research subjects are diverse, and represent common practical issues.

Effective intra-net communication is vital to the existence of the network, and is accomplished by 3 modalities: 1) semiannual updates by mail, 2) e-mail, using an electronic mailing list to facilitate connection between members, 3) semi-annual meetings. Research budgets are derived from public sources like the Ministry of Health and IAPA, and private sources such as pharmaceutical companies. The administration of the network is supported by Schneider Children's Medical Center, and financed by IAPA.

Depression Scale for Research in and Identification of Postpartum Depression

Saralee Glasser, Vita Barell

Health Services Research Unit, Ministry of Health, Sheba Medical Center, Tel Hashomer

Postpartum depression (PPD) is a relatively frequent and serious condition, with negative consequences for the mother, her infant, and the family. From research and clinical experience in many countries, it has been found that PPD can be identified early, and women at risk for developing PPD can be identified before delivery in the framework of primary health care service. The Edinburgh Postnatal Depression Scale (EPDS) has been found valid for this purpose, both in the original English version, and in translation to numerous languages. The Hebrew translation of the EPDS is presented, and it is recommended that Israeli researchers use the same translation to facilitate accumulation of knowledge regarding the epidemiology of PPD and intervention strategies in various Israeli population groups, and for comparison with data from other countries.

Effect of the Yom Kippur Fast on Parturition

A. Wiser, E. Maymon, M. Mazor, I. Shoham-Vardi, T. Silberstein, A. Wiznitzer, M. Katz

Depts. of Obstetrics and Gynecology and of Epidemiology, Soroka Medical Center, and Faculty of Health Sciences, Ben-Gurion University of the Negev, Beer Sheba

Food-withdrawal has been proposed as a possible mechanism for initiating the onset of labor in animals and humans. The hypothesis was based upon the reported increase in deliveries of infants during the Yom Kippur fast. We studied the effect of the fast on full term deliveries of Jewish women, with non-fasting Bedouin women as controls (1988-1995, 1,313 Jewish and 1,091 Bedouin deliveries). To determine the effect of Yom Kippur itself, delivery rates on Sukkot and Yom Kippur were compared in both groups. The mean delivery rate in the Jewish population was significantly higher during Yom Kippur and the day after, than during the 7 days before Yom Kippur (15.1±5.1 and 14.6±4.7 vs 10.7±3.5, p<0.04 and p<0.01, respectively). There was an increase in delivery rate during the 6 hours before the end of the fast. In the Bedouin women there were no changes in delivery rate during any of these periods. There were no significant differences in the rates of deliveries during the Sukkot festival between Jewish and Bedouin women. We conclude that fasting is associated with a significant increase in the rate of deliveries at term.