Decompression Sickness in Divers Treated at the Israel Naval Medical Institute 

A. Gil, A. Shupak, H. Lavon, Y. Adir

Israel Naval Medical Institute, Israel Defense Forces, Haifa

Clinical characteristics of 125 divers treated for decompression sickness (DCS) in the hyperbaric multiplace chambers of this Institute during 1992-1997 were analyzed retrospectively. In 62 (51%) the diagnosis was DCS Type I (joint pain or skin involvement) and in 60 (49%) DCS Type II (neurological, inner ear or pulmonary disease). Risk factors for the evolution of DCS were depth and duration of the dives involving accidents, violation of recommendations of the decompression tables, and repeated dives.

Results were available for 112 of the 125 patients. 54 of them (48%) recovered completely, and another 54 recovered partially; 4 did not respond to treatment. Inner ear DCS was less responsive to hyperbaric oxygen treatment (p=0.0001). There was significant improvement of neurological function in those with severe neurological injury (p=0.0001). Rapid diagnosis and transportation of divers with DCS to a hyperbaric chamber is of crucial importance.

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.
 

Medical Support During The Sinai War Of Attrition (1968-1970): A 30-Year Perspective 

Z. Gimmon, J. Adler

Dept. of General Surgery, Hadassah-Hebrew University Medical Center, Ein Kerem, Jerusalem and Medical Section, Israteam, Lod

The War of Attrition between Israel and Egypt along the Suez Canal line lasted 23 months (9/1968-8/1970), during which the Israel Defense Forces (IDF) were mostly in fixed fortifications. A few of the important principles of field medical support, which became cornerstones of IDF procedure, were established during that war. These included use of armored vehicles for evacuation under artillery fire, as well as emergency treatment, physiological stabilization, and maintenance of the wounded until evacuation.

The latter objectives were achieved by stationing medical officers and paramedics within the fortifications, where they remained with the troops. A field surgical hospital was established in Refidim which had a trained surgical staff and a well-equipped emergency department. It included an operating theater and post-op recovery facilities for proper surgical care until evacuation to hospitals in the rear.

Tables showing the number of casualties throughout 1 year of the War of Attrition are presented. Better personal shielding by helmets and body shields decreased the number and severity of head and thoraco-abdominal injuries. The relative large number of those who died-of-wounds was due to the proximity of medical facilities, so that treatment could be administered within the fortifications. Otherwise, many more would have been included among the killed-in-action.

Burn Injuries During the Six Day War 

Uriel Y. Dreyfuss

Dept. of Orthopedics, Bnai Zion Medical Center, Haifa

About 2500 soldiers were injured during the Six Day War (June 1967) of whom 115 suffered from burns. In 34 of them 15% or more of their body surface was involved and 11 died. Typical features of these burn cases were supplementary injuries, a high rate of infection, and long periods of hospitalization. Prophylactic antibiotics were not useful. The general condition of many deteriorated during the first week after injury, indicating the importance of treating severe burns in specialized facilities.

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.

Pre-Induction Sport Activity in Prevention of Stress Fractures 

Aharon S. Finestone, Arieh Eldad, Charles Milgrom

Medical Corps, Israel Defense Forces, and Dept. of Orthopedics, Rabin Medical Center, Beilinson Campus, Petah Tikva and Hadassah University Hospital, Ein Kerem, Jerusalem

Pre-induction sports participation of 392 elite infantry recruits was evaluated for correlation with incidence of stress fractures (SF) during 14 weeks of basic training. 23.7% developed lower extremity stress fractures. 72% of the recruits had participated in sports on a regular basis during the 2 years prior to induction. Their fitness as examined by the Bar-Or induction fitness test, was significantly better than that of those who had not trained. 14.9% of the soldiers who had previously participated in ball games (primarily basketball) as an only sport suffered stress fractures, compared to 31.0% of those whose only sport was running (p<0.005).

Training for only 6 months prior to induction had no effect on the incidence of SF. The reason for the difference between ball games and running is probably related to the higher strains and strain rates developed during ball games and to their multidirectional nature, as compared to running.

These findings suggest that participation in a pre-induction program that includes activities that create strains, such as basketball, can reduce incidence of SF in infantry recruits. The training period has to last at least 2 years.

Prediction of Physiological Response from Mathematical Models 

Yoram Epstein, Yuval Heled, Daniel Moran, Yair Shapiro

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

The ability to predict the physiological responses of workers exposed to extreme environmental conditions, has been a challenge to environmental physiologists for more than 3 decades. Therefore, mathematical models have been developed to predict metabolic rate under various levels of work intensity and dynamic changes in body temperature and heart rate.

Based on the effect of exercise on the cardiovascular system, a model was developed to predict mean arterial blood pressure as a function of heart rate. Physiological strain could also be estimated on the basis of thermoregulatory and cardiovascular strains.

This paper summarizes knowledge accumulated during 25 years of studies in the field of mathematical modeling of physiological parameters. Besides analyzing the logic underlying each model, it explains the scientific approach in developing a model from its early concept to the model's application in the field.

Acetaminophen Toxicity in Children - A Therapeutic "Misadventure"

Sarit Shahroor, Yigal Shvil, Mely Ohali, Esther Granot

Dept. of Pediatrics, Hadassah University Hospital and Hebrew University Hadassah Medical School, Jerusalem; and Dept. of Pediatrics, Barzilai Medical Center, Ashkelon

Acetaminophen toxicity after repeated administration of amounts that only moderately exceed recommended doses, is being increasingly reported in alcoholic or fasting adults. Pediatric experience with this pattern of acetaminophen toxicity is sparse.

We present 2 children who developed severe hepatic damage, with renal insufficiency as well in 1, after 15-20 mg/kg of acetaminophen, given at 4-hour intervals for 3-4 days during an intercurrent febrile illness. When given in doses as low as 20 mg/kg at frequent intervals for a number of days, the drug puts children who are vomiting or have sharply reduced caloric intakes at increased risk for severe toxicity.

Increased caution and awareness of the toxic effects of acetaminophen are needed, and it should be dispensed with appropriate package-label warnings.

Acipimox as a Secondary Hypolipidemia in Combined Hypertriglyceridemia and Hyperlipidemia

D. Yeshurun, H. Hamood, N. Morad, J. Naschitz

Hyperlipidemia Clinic, Dept. of Medicine A, Bnai-Zion Medical Center, and Rappaport Faculty of Medicine, Technion, Haifa

32 patients with hypertriglyceridemia, excessive hypertri- glyceridemia, and combined hyperlipidemia, were treated with the nicotinic acid derivative acipimox (Olbetam). First line treatment with bezafibrate, or statins in some with combined hyperlipidemia, had failed. In 10 acipimox was discontinued due to side effects or absence of clinical response. The other 22 completed 6 months of treatment with no side effects.

Acipimox caused a significant 54% decrease in triglyceride levels, a 23% decrease in total cholesterol, and a 12% increase in HDL-cholesterol. LDL-cholesterol was difficult to calculate because of the high triglyceride levels, so no results are presented.

Although acipimox was much better tolerated than nicotinic acid, it also had side effects, but fewer. Acipimox can therefor be used as a second-line drug, mainly in those with combined hyperlipidemia and hypertriglyceridemia.

Laparoscopic Approach in Treating Hepatic Cysts 

P. Schachter, V. Sorin, M. Shimonov, A. Rosen, A. Czerniak

Dept. of Surgery A, Wolfson Medical Center, Holon

Solitary and multiple hepatic cysts are now more commonly found because of advances in imaging techniques. Most hepatic cysts are asymptomatic, but when they do cause symptoms they require surgical intervention. The advent of laparoscopy and of laparoscopic ultrasonography allow comprehensive evaluation and treatment of the cysts.

12 patients with hepatic cysts were treated laparoscopically. 8 with single cysts underwent successful subtotal cyst resection without signs of recurrence (up to 20 years of follow-up). 4 with polycystic liver disease underwent sub-total resection of superficial cysts. Deep cysts were unroofed and drained under laparoscopic ultrasound guidance. In this group, 1 experienced recurrence of symptoms and required partial hepatectomy of the involved segment. In another, a connection between a deep cyst and bile ducts was demonstrated and cystojejunostomy was performed.

The laparoscopic approach in the management of patients with liver cysts is effective and safe, and we recommend it as the procedure of choice for single hepatic cysts. In polycystic liver disease the procedure is much less successful.

Preflight Assessment by Hypoxic Inhalation Test in Cardio-Pulmonary Patients 

J. Lebzelter, G. Fink, E. Kleinman, I. Rosenberg, M.R. Kramer

Pulmonology Institute, Rabin Medical Center, Beilinson Campus, Petah Tikva

Flying may expose passengers to hypoxic conditions, which may induce hypoxemia, particularly in those with chronic heart and/or lung disease. Onset of dyspnea, wheezing, chest pain, cyanosis and right heart failure can lead to urgent need for oxygen during flight. The hypoxia inhalation test (HIT) provides a safe and simple means of identifying those who may develop hypoxemia during flight.

We report our experience with 48 self-reporting patients who underwent HIT prior to pre-planned air travel. They inhaled for 15-minute periods a reduced oxygen concentration (F₁O₂ 15%) under normobaric conditions, during which O₂ saturation was monitored by pulse oximeter; electrocardiogram, blood pressure and symptoms were also monitored. O₂ saturation of 85% (PaO₂ 50 mm Hg) was considered a positive test. In the 8 cases (17%) with a positive test, 5 had chronic obstructive pulmonary disease and 3 had cardiovascular and/or combined heart-lung disease.

We calculated predicted O₂ partial pressure in altitude (PaO₂ ALT) and compared it to actual results in the 8 patients with a positive HIT. In 5, use of the predicted formula would have under-diagnosed the hypoxemia that developed during the HIT. Thus, the results of the HIT changed treatment strategy in these patients. We recommend that patients with positive tests use O₂ (2LPM or 4LPM) during flight.

HIT is practical and of potential benefit in the objective assessment of patients with various degrees of heart, lung or combined heart-lung disease. Clinicians should be aware of the relative risk of hypoxia during flight in such patients, and of the value of HIT in identifying them, leading to increase in its use.

Ethnicity and Emergency Department Visits in the Negev

Shahar Livnat, Eyal Almog, Gad Rabinowitch, Yoram Snir

Dept. of Emergency Medicine, Soroka University Medical Center and Dept. of Industrial Engineering and Management, Ben-Gurion University of the Negev, Beer Sheba

The population of the Negev consists mainly of Jews and Bedouin, who have very different life styles. Patients of both ethnic groups use our emergency department exclusively, providing a unique opportunity to study comparative patient habits.

In gathering and processing the information we used Data Mining technology, which allows search for unique patterns in large data bases. We examined demographic data on some 64,000 emergency department visits during 1997-8, mostly medical and surgical cases, but not trauma cases. Many more were by Bedouin than Jews, and between the ages of 25 and 44, more by women than men. There were changes in trends in comparison with an arrival survey conducted some 11 years before.

Placenta Accreta with Placenta Previa after Previouscesarean Sections 

Eylon Lachman, Alexander Mali, Gabriel Gino, Michael Burstein, Michael Stark

Depts. of Obstetrics and Gynecology and of Pathology, Misgav Ladach Hospital, Jerusalem

The increased rate of cesarean sections in recent decades has brought with it an increase in the frequency of placenta accreta. There are direct correlations between previous cesarean deliveries and also maternal age, with the risk of placenta accreta. There is also a direct correlation between placenta accreta and placenta previa.

The risk of placenta accreta in women who have had placenta previa is 2% for those younger than 35 years and with no history of uterine surgery. The risk increases to 39% for those over 35 who have had 2 or more cesarean sections.

We present 3 cases of placenta accreta admitted in 15 months, all of whom had a history of cesarean sections. The frequency of placenta accreta in our hospital is 1:1,579 deliveries, in line with the 1:1,420 in the literature. We consider hysterectomy the treatment of choice for this serious complication. When performing a cesarean in cases of placenta previa with a history of cesarean sections, the possibility of placenta accreta should be considered.

Etoposide and Cisplatin for Non-Small Cell Lung Cancer 

David B. Geffen, Sofia Man, Yoram Cohen*

Dept. of Oncology, Soroka-University Medical Center and Faculty of Health Sciences, Ben-Gurion University of the Negev, Beer Sheba

Etoposide and cisplatin (EP) has been the standard therapy for non-small cell lung cancer (NSCLC) at many cancer centers for over a decade. We analyzed our experience with EP in NSCLC to provide a baseline for comparison with new drugs. From 1986 through 1994, 46 of our patients with NSCLC received EP as first-line chemotherapy. Radiation therapy was administered to 25 of them, including 20 who received it immediately before or concomitantly with chemotherapy. Toxicity was mild and included only 1 episode of neutropenic fever and 1 case of reversible renal failure.

Overall response was 22%. In 3, response was complete (pathologically documented in 2 of them) and in 7 partial. Median survival in locally advanced (stage III) and metastatic disease (stage IV and recurrent) were 12 months and 7 months, respectively. 2 patients are alive and free of disease more than 6 years after diagnosis.

Our results are consistent with other published studies of EP in NSCLC. EP provides modest benefit in locally advanced NSCLC, with minimal toxicity.

Jules E. Harris Chair in Oncology.

Elective Repair of Infra-Renal Aortic Aneurysm 

J.D. Cohen, P. Singer, M. Haddad, A. Zelikovski

Depts. of General Intensive Care and Vascular Surgery, Rabin Medical Center, Beilinson Campus; and Sackler Faculty of Medicine, Tel Aviv University

Age over 80 years is generally considered an independent risk factor in elective surgery for abdominal aortic aneurysm (AAA). As the general population increases in age, more elderly are likely to be candidates for such surgery.

We studied prospectively 100 consecutive patients undergoing elective AAA surgery between 1992-1995. All were operated on by the same team of anesthetists and surgeons and all were transferred to the general ICU for at least the first 24 hours. 16 were above the age of 80 (Group I) and 84 below (Group II).

We recorded preoperative factors (demographics, medical history, risk factor indices, EKG findings, as well as left ventricular ejection fraction (LVEF) and stress imaging when indicated); intraoperative factors (duration of surgery, size of aneurysm, complications and units of blood transfused); postoperative factors (length of ICU stay, duration of ventilation, APACHE II [Acute Physiological and Chronic Health Evaluation] and TISS [Therapeutic Intervention Scoring System] scores; complications in the ICU, need for readmission to the ICU, and mortality).

In Group I LVEF was greater (p=0.03) and aneurysm size significantly larger (p=0.036), but there were no other significant differences between the 2 groups with regard to pre- and intraoperative data. Group I patients were not ventilated as long (p=0.038), but there were no significant differences in outcome factors. Mortality for the whole group was 5% and was not significantly different in the 2 groups (1/16 in Group I and 4/84 in Group II).

We conclude that there is no excess morbidity or mortality in octogenarians undergoing AAA surgery. However risk of the aneurysms rupturing is significantly greater since they are larger. We suggest that age not be considered the sole criterion for aneurysm repair, or at least not in selected patients with normal LVEF.