תוצאת חיפוש

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.
 

Laparoscopy for Common Bile Duct Stones

Ibrahim Matter, Moshe Wald, Shmuel Eldar

Depts. of Surgery and Urology, B'nai-Zion Medical Center, Haifa

We performed 75 laparoscopic cholecystectomies during July and September 1996. In 3 men and 4 women, aged 32-87 years, there was obstructive jaundice caused by choledocholithiasis. During laparoscopy in the jaundiced patients, calculi were identified by cholangioscopy and intra-operative cholangiography. They were washed into the duodenum (confirmed cholangiographically) after intravenous glucagon injections and dilation of the papilla of Vater.

Serum bilirubin and liver enzyme levels returned to normal within a few days. There was no operative or postoperative morbidity, nor any biliary-related systemic complications. Average postoperative hospitalization was 3 days.

Danaparoid-Sodium for Dialysis in Heparin-Associated Thrombocytopenia

Ronen Ben Ami, Ruth Rachmimov, Shlomo Berliner

Medicine Dept. D and Anticoagulation Therapy Unit, Tel Aviv-Souraski Medical Center, and Nephrology Institute, Sheba Medical Center, Tel Hashomer

Danaparoid sodium is an anticomposed of 3 glycosaminoglycans: heparan sulfate, dermatan sulfate and chondroitin sulfate. Similar to heparin, operates by activating antithrombin 3, but does not contain heparin or heparin fragments, and is therefore antigenically distinct.

Danaparoid has been advocated as a safe and effective anticoagulant for heparin-associated thrombocytopenia. However, there is little experience in its use as a substitute for heparin in hemodialysis.

We report 2 men, aged 82 and 73 years, respectively, who developed thrombocytopenia while undergoing hemodialysis with heparin, and who subsequently underwent successful dialysis with danaparoid. There was a rise in platelet levels in both while receiving danaparoid, and dialysis was completed without hemorrhagic or thrombotic complications. Danaparoid is a safe and effective substitute for heparin, and may be used as an anticoagulant in hemodialysis.

Autonomic Dysregulation in Post-Traumatic Stress Disorder: Power Spectral Analysis of Heart Rate Variability

Hagit Cohen, Uri Loewenthal, Mike A. Matar, Hanoch Miodownik, Zeev Kaplan, Yair Cassuto, Moshe Kotler

Mental Health Center, Israel Ministry of Health; Anxiety and Stress Research Unit, Faculty of Health Sciences; Dept. of Life-Sciences, Ben-Gurion University of the Negev, Beer Sheba

Spectral analysis of heart rate variability (HRV) has been shown to be a reliable noninvasive test for quantitative assessment of cardiovascular autonomic regulatory response, providing a dynamic map of sympathetic and parasympathetic interaction. In a prior study exploring the state of hyperarousal that characterizes the post traumatic stress disorder (PTSD) syndrome, we presented standardized heart rate analyses in 9 patients at rest, which demonstrated clear-cut evidence of a baseline autonomic hyperarousal state.

To examine the dynamics of this hyperarousal state, standardized heart rate analysis was carried out in 9 PTSD patients, compared to a matched control group of 9 normal volunteers. 20-minute ECG recordings in response to a trauma-related cue, as opposed to the resting state, were analyzed. The patients were asked to recount the presumed triggering traumatic event, and the control subjects recounted a significant stressful negative life event.

Whereas the control subjects demonstrated significant autonomic responses to the stressogenic stimulus of recounting major stressful experiences, the patients demonstrated almost no autonomic response to the recounting of the triggering stressful event. The patients demonstrated a degree of autonomic dysregulation at rest comparable to that seen in the control subjects' reaction to the stress model.

The lack of response to the stress model applied in the study appears to imply that PTSD patients experience so great a degree of autonomic hyperactivation at rest, that they are unable to marshal a further stress response to the recounting of the triggering trauma, as compared to control subjects. A subsequent study of the effect of medication on these parameters showed that they are normalized by use of selective serotonin re-uptake inhibitors (SSRI's).

Neither the clinical implications of these findings, nor their physiological mechanisms are clear at present. We presume that they reflect a central effect, as the peripheral automatic effects of SSRI's are relatively negligible.

Stromal Uterine Sarcoma arising from Intestinal Endometriosis after Abdominal Hysterectomy and Salpingoophorectomy

Munir Bishara, Eitan Scapa

Institute of Gastroenterology, Hepatology and Nutrition, Assaf Harofeh Medical Center, Zerifin (Affiliated with the Sackler Faculty of Medicine, Tel Aviv University)

The incidence of ectopic endometriosis is 4% to 18%. The intestinal type is quite common with the rectosigmoid the most likely part of the bowel to be involved due to its pelvic location. A 43-year-old woman, whose symptoms, X-ray and endoscopic findings suggested malignancy of the rectosigmoid, is presented. Primary malignancy of the bowel was excluded by endoscopic biopsies. Histological examination at operation showed stromal sarcoma of the uterus with foci of endometriosis. There is no report in the English literature of transformation of intestinal endometriosis into malignancy, such as stromal sarcoma of the uterus, which imitates a primary malignancy with obstruction of the rectosigmoid.

Leg-Lengthening For Length Inequality

Zvia Burgansky, Abraham Ganel, Uri Givon

Pediatric Orthopedics Unit, Chaim Sheba Medical Center, Tel Hashomer (Affiliated with the Sackler Faculty of Medicine, Tel Aviv University)

32 patients (age range 1.5-22 years) were treated for leg-length discrepancy. 39 lengthening procedures were performed of which 36 involved gradual distraction, in 2 cases chondrodiasthesis was used, and 1 had 1-step elongation. Gradual distraction was done according to Ilizarov, including corticotomy and a 1-week delay before the initiation of distraction. In 33 cases Wagner's external fixator was used, in 2 an Ilizarov frame and in 1 an orthofix fixator. There was complete clinical and radiological union in all but 1 case. Significant correction of leg-length discrepancy and equalization of leg-length was achieved in most patients. In some growing patients over-correction was successfully achieved. The most prevalent complications were pin-site problems, axis deviation, joint subluxation and joint contractures. At latest follow-up most of these complications had disappeared. 91% of the patients either functioned normal or were only mildly limited.