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עמוד בית
Thu, 24.07.25

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November 2001
Haim Ashkenazi, MD, Bernard Rudensky, PhD, Esther Paz, MA, David Raveh, MD, Jonathan A. Balkin, MBBCh, Dan Tzivoni, MD and Amos M. Yinnon, MD

Background: Recent studies have suggested a possible association between Chlamydia pneumoniae infection and coronary heart disease.

Objectives: To determine titers of antibodies to Chlamydia pneumoniae in patients with acute  myocardial infraction compared with titers in several control groups.

Methods: This prospective case-control study investigated 209 individuals. We assessed the serum IgG antibody titers to Chlamydia pneumoniae in 57 consecutive patients admitted with AMI to our intensive coronary care unit during a 4 month period. A serum sample was drawn upon admission after 6 weeks. Results were compared with those of four control groups: a) patients admitted with community-acquired pneumonia (n=18), b) patients with community-acquired urinary tract infection (n=42), c) patients with angiographically normal coronary artery disease (n=44), and d) patients with stable coronary artery disease (n=48). Serum immunoglobin G antibody titers to C. pneumoniae were determined using standard micro-immunofluorescene technology.

Results: Of 57 patients with AMI, 32 (56%) had a high lgG titer to C. pneumoniae (>=1:256) on the initial test, which remained unchanged (62%) after 6 weeks. The percentage of patients with high titers was significantly lower in the control groups: 5 of 18 patients (28%) in the pneumonia group (P<0.01), 11 of 42 (26%) in the urinary tract infection group (P<0.01), 11 of 44 (25%) with normal coronary arteries (P<0.01), and 17 of 48 (35%) with stable chronic ischemic heart disease (P<0.05).

Conclusion: The detection of high titers of lgG antibodies to C. pneumoniae in many patients with AMI, compared to control groups, suggest that chronic Chlamydia pneumoniae infection plays a role in the pathogenesis of atherosclerosis and acute ischemic events.

Mariana Munichor, MD, Daniel Gold, PhD, Jacob Lengy, PhD, Ran Linn, MD and David Merzbach, PhD
October 2001
Galya Rozen, MD, David R. Samuels, MD and Annat Blank, MD
September 2001
David S. Blondheim, MD, Orna Blondheim, MD and S.H. Blondheim, MD

Background: Fasting is required by the Jewish and Islamic religions, and may sometimes be necessary for non­religious reasons as well. Very little empiric data are available on the effect of 24 hours of food and water deprivation.

Objectives:  To compare the effects of the dietary composition of different pre-fast meals on subjective discom­fort and various other parameters of a 24 hour food and water fast.

Methods: Thirteen volunteers of both genders participated in a non-randomized crossover study. Each consumed three different equicaloric pre-fast meals in which the main source of calories was protein (49% of calories), carbohydrate (86%), or fat (69%). Weight, heart rate, blood pressure, blood and urine were tested before and after 24 hours of fasting, and the subjective evaluations of the discomfort during the three fasts were compared.

Results: After the protein-rich meal greater discomfort and more side effects were reported. Weight and blood pressure decreased at the end of the fasts that followed each of the three meals heart rate increased after the high fat and carbohydrate meals but not after the protein meal. The main laboratory findings were a 40% increase in blood urea nitrogen and higher urine osmolarity after the protein-rich meal than after the other meals.

Conclusion: A protein-poor pre-fast meal is likely to be followed by easier fasting.
 

August 2001
July 2001
Boaz Meijer, MD, David Branski, MD and Eitan Keren, MD

Background: Prevention of cigarette smoking is an important issue in public health policy. Since most adult smokers began smoking in childhood, understanding behavor­ial factors associated with smoking initiation would contribute to smoking initiation programs. Health-related behavior may vary between different ethnic groups.

Objectives: To determine the prevalence of smoking among Jewish and Arab adolescents in Jerusalem, and whether there are differences in smoking initiation between the two ethnic groups.

Methods: We carried out a cross-sectional survey of all students in the 6th to 11th grades (age range 11-17 years) of a Jewish school and an Arab school in the Jerusalem area, using an anonymous self-completion questionnaire. A total of 791 questionnaires was analyzed, 479 from the Jewish students and 312 from the Arab students.

Results: The lowest prevalence of smoking was found among Arab female students and the highest among Jewish female students (9% vs. 41%, P<O.OO1). The prevalence of smoking among Jewish and Arab males was similar. More Arab female students smoked than their mothers. Peer pressure seemed to be a more important factor among Jewish students.

Conclusions: This study demonstrated the presence of ethnic differences in smoking prevalence and the reasons for smoking among adolescents in Israel. These results suggest the need for specific smoking prevention policies for different ethnic groups.

June 2001
Stacey Spivack, MD, Elliot Kalker, MD, David Samuels, MD and Dan E. Orron, MD
May 2001
Raul Raz, MD, Ronith Koren, PhD and David Bass, MD

Background: Previous data showed that new recombi­nant hepatitis B virus vaccine, which contains the S-protein component of the HBV surface together with the Pre-S1 and Pre-S2, is considerably more immunogenic than a second-generation recombinant I-IBV vaccine.

Objectives:To compare the immunogenicity and safety of a novel recombinant HBV vaccine S1, Pre-S1 and Pre-S2 protein components of the hepatitis B surface antigen - Bio­TM

HepTM 10
לg dose, to a licensed vaccine containing only the S-protein component - Engerix-B, 20 לg dose.

Methods: A prospective randomized study included 524 adults - 260 in the Bio-Hep group and 264 in the Engerix-B group. Both vaccines were administered in a three-dose regimen given at 0, 1 and 6 months, and adverse events were recorded on a diary card 5 days after each vaccination. lmmunogenicity was tested by measuring anti-hepatitis B surface antibody.

Results: One month after the third injection, 98% of the BioHepTM subjects were found to be seroprotected vs. 85.1% of the Engerix-B group. In addition, the geometric mean titers were 2,203 mlU/ml and 326 mlU/ml in the Bio-Hep-B and Engerix-B groups respectively. An immunogenic advantage of Bio-Hep-B was suggested by the rapid onset of antibody response - 66.5% were seroconverted one month after the first injection as compared to 19.3% in the Engerix-B group. No unexpected adverse events were observed, and the recorded events were mild in both groups.

Conclusions: BioHepTM, a novel recombinant HBV vaccine containing 5, Pre-S1 and Pre-S2 protein components. at a lower dose, is safe and more immunogenic than the conventional HBV vaccine that contains only S protein.

David Kershenobich, MD, PhD and Cristian Heinrich Henonin, MD

The hepatitis C virus is an enveloped positive-sense single-stranded RNA virus, which has been classified into 6 major genotypes and over 100 subtypes. HCV replicates mainly in the hepatocyte. Recently, infectious HCV cDNA clones have been generated. Despite evidence that innate and adaptative humoral and cellular immune responses are activated as part of an antiviral defense, HCV has a remarkable ability to establish persistent infection. The analysis of viral kinetics using mathematical modeling shows a relative steady state without treatment, while an immediate biphasic HCV decline occurs in blood during successful treatment, the latter being predictive of clearance of HCV by the end of treatment.

March 2001
Michael Davidovitch, MD, Gabriela Holtzman, MD and Emanuel Tirosh, MD

Background: Autism is a pervasive developmental dis­order. The incidence rate and other related epidemiological characteristics of the Israeli population are not available.

Objectives: To assess the incidence rate of autism in the Haifa area and to compare family characteristics with previous reports from other countries.

Methods: We approached facilities in the Haifa area that are involved with the diagnosis and treatment of autism. The study group comprised children born between 1989 and 1993. Records of the children were scrutinized and 69% of the mothers were interviewed. Live-birth cohorts of the same years were employed for incidence computation.

Results: An incidence rate of 1/1000 was derived. Male to female ratio was 4.2:1. Pregnancy and perinatal periods were mostly uneventful. A low prevalence of developmental and emotional morbidity was reported for family members.

Conclusions: The epidemiological characteristics found in the Haifa area are similar to those reported from non-Israeli communities. This finding supports an underlying biological mechanism for this disorder. These data can be used for future trend analyses in Israel.
 

February 2001
Ma C. Gutierrez-Ruiz, PhD, Luis E. Gomez Quiroz, MSc, Elizabeth Hernandez, MSc, Leticia Bucio, PhD, Veronica Souza, MSc, Luis Llorente, PhD and David Kershenobich, PhD

Background: Inflammatory mediators, including cytokines and reactive oxygen species. are associated with the pathology of chronic liver disease. Hepatocytes are generally considered as targets but not producers of these important mediators.

Objectives: To investigate whether cells of hepatocellular lineage are a potential source of various cytokines we estimated the expression and secretion of tumor necrosis factor alpha, transforming growth factor beta 1 and interleukins I beta, 6 and 8 in the culture of well-differentiated human HepG2 cells treated for 24 hours with ethanol, acetaldehyde and lipopolysaccharide. Lipid peroxidation damage, glutathione content and glutathione perox­idase, catalase and superoxide dismutase activity were also determined.

Methods: HepG2 cells were treated for 24 hours with ethanol (50 mM), acetaldehyde (175 ìM) and LPS (1 ìg/ml). TNF-á, TGF­-â, L-1â, IL-6 and IL-8 mRNA were determined by reverse transcriptase polymerase chain reaction and secretion by en­zyme-linked immunoassay. Lipid peroxidation damage, glutathione content and antioxidant enzyme activities were determined spectrophotometrically.

Results: Exposure to ethanol for 24 hours induced the expression of TNF-á and TGF- â1. secretion of IL-1â and TGF-â1 and decreased catalase activity. Acetaldehyde markedly increased TNF-á and IL-8 expression, stimulated IL-1â and IL-8 secretion, increased lipid peroxidation damage and decreased catalase activity, while LPS exposure induced the expression of TNF-á. TGF- â1, IL-6 and IL-8, the secretion of TGF-â1, IL-1â, IL-6 and IL-8, and a decrease in catalase activity. No change in GSH, GSHPx or SOD was found in any experimental condition.

Conclusions: The present studies confirm and extend the notion that hepatocytes respond to ethanol, acetaldehyde and LPS-producing cytokines. Oxidative stress produced by the toxic injury plays an important role in this response through up­regulation of inflammatory cytokines.

January 2001
Pnina Langevitz MD, Avi Livneh MD, Lily Neumann PhD, Dan Buskila MD, Joshua Shemer MD, David Amolsky MD and Mordechi Pras MD

Background: Familial Mediterranean fever is a genetic disorder manifested by recurrent attacks of peritonitis, pleuritis and arthritis, and characterized by clinical, histological and laboratory evidence for localized and systemic inflammation. Colchicine treatment usually prevents the attacks and the associated inflammation. Inflammation of atherosclerosis and ischemic heart disease.

Objective: To study the effect of inflammation and its prevention on occurrence of IHD, using FMF as a model.

Methods and Patients: We studied the presence of IHD and its risk factors in 290 FMF patients aged 40 years or more, and in two control groups – 233 spouses of the FMF patients’ and 126 patients with inflammatory diseases obtained from other outpatient clinics. FMF patients were also compared with age and gender-matched individuals from the population reference data of the Israel Ministry of Health.

Results: The prevalence of IHD in FMF patients was significantly lower than in the group of controls from other outpatient clinics (15.5% vs. 30.2% P< 0.05) and comparable with their spouses (11.2%) and with the matched general population in Israel (16%).

Conclusion: These findings suggest that despite the evidence of recurrent inflammation, colchicines-treated FMF patients are not more predisposed to IHD than the normal population.

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