Israel Medical Association Journal

Background: Decompression sickness (DCS) is a clinical syndrome caused by a substantial reduction in barometric pressure. DCS is more common among divers but may also occur during flight or altitude chamber (hypobaric chamber) training. DCS is classified according to symptoms as either Type 1 (musculoskeletal and skin involvement) or Type 2 (neurological and pulmonary involvement). DCS may be life threatening and often necessitates treatment with hyperbaric oxygen therapy (HBOT).

Objectives: To examine the risk for altitude decompression sickness (ADCS) in altitude chamber training and to compare ADCS symptoms and treatment to those of DCS in divers (DDCS).

Methods: We conducted a retrospective cohort study that included all cases of ADCS in the Israeli Air Force between 2015 to 2022. We collected demographic, flight platform, altitude chamber training, clinical manifestations, and treatment data. Data regarding DDCS was obtained via a literature review.

Results: There were 2279 altitude chamber trainees and aviation physiology instructors. Of these, 11 presented ADCS, leading to a calculated ADCS risk of 0.5%. An additional four cases were reported following combat flights. Musculoskeletal involvement was the most common symptom in both DDCS and ADCS. A shorter HBOT protocol was used in 53% of the ADCS cases but only in 30% of the DDCS cases.

Conclusions: Overall, ADCS is a rare event, occurring in less than 1% of altitude chamber trainees. The common manifestation is of musculoskeletal involvement, and the mainstay of treatment remains HBOT.

Background: Exertional heat stroke (EHS) is common among individuals engaged in high-intensity physical activity. It can lead to long-term organ damage and be a life-threatening condition when diagnosed and treated incorrectly.

Objectives: To track the changes in biomarkers among EHS patients, to suggest a standardized protocol of clinically relevant biomarkers to be followed during hospitalization

Methods: We conducted a retrospective analysis on biomarker changes in seven EHS patients (aged 18–25 years) who were hospitalized for a minimum of 84 hours. Diagnosis of heat stroke was based on extreme body temperature and neurological deficits. Biomarkers indicative of kidney function, liver function, coagulation, muscle breakdown, and systemic inflammation during their hospitalization were analyzed.

Results: The initial average rectal temperature (T_re) was 41.1°C. Patients were cooled to approximately 38.5°C before being transferred to the emergency department (ED). Within the first 24–36 hours of hospitalization, biomarker levels reach peak levels depending on EHS severity. Renal biomarkers rose to 1.5–3 times normal values, while transaminases increased 7–15 times. Creatine phosphokinase, indicating muscle injury, reached an average of 100 times its reference range. Within 24–72 hours. all biomarker levels were normalized.

Conclusions: There is often a gap between the initial temperature of an EHS patient and the temperature recorded at ED admission after cooling. Accurate assessment is context-specific and requires precise biomarker follow-up. Clinical evaluation should continue for at least 48 hours to track organ damage and guide prognosis.

Background: Asthma poses unique challenges in aviation medicine. While strict criteria typically dictate waiver approvals in military aviators with asthma, the Israeli Air Force (IAF) applies a more individualized approach. Still, evidence to guide correct management is scarce.

Objectives: To assess the characteristics and long-term outcomes of military aircrew diagnosed with asthma.

Methods: This retrospective study included active and reserve aircrew who were diagnosed with asthma during annual assessments at the Israeli Aeromedical Unit between 1998 and 2024. Baseline characteristics, treatment regimes, pulmonary function tests (PFTs), and asthma exacerbations were analyzed.

Results: Thirty-two aircrew personnel (median age 30 years at diagnosis) were included in the study, with 44% serving at high-performance platforms. Six participants (19%) were classified as Global Initiative for Asthma step 4 or 5. Over an average follow-up period of 18.5 years, seven exacerbations were documented (4.0 per 100 patient-years), with no safety incidents reported. Participants' pulmonary function remained stable. Forced expiratory volume in 1 second (FEV₁) and FEV₁/forced vital capacity (FVC) declined around asthma diagnosis (median of 82% predicted and 0.73, respectively) but recovered remarkably while on treatment (median 91% predicted and 0.78, respectively). Aircrew who experienced exacerbations had no statistically significant differences in demographics, disease severity or baseline PFTs.

Conclusions: With individualized management and regular monitoring, a new diagnosis of asthma in military aircrew was not associated with a significant impact on service. Our study supports a flexible, individualized approach to aeromedical management of aircrew with asthma.

Background: Age is a well-established prognostic factor in civilian trauma, where adverse outcomes increase with ages. Whether this pattern holds true in military trauma, where populations, injury mechanisms, and systems of care differ fundamentally, remains uncertain. A large-scale mobilization of Israeli Defense Forces (IDF) reservists provided an opportunity to examine this association.

Objectives: To clarify whether older service members experienced less favorable outcomes compared with younger counterparts.

Methods: This retrospective cohort study included IDF casualties recorded in the IDF Trauma Registry and the Israel National Trauma Registry between 27 October 2023 and 19 January 2025. Participants were categorized by age: 18–21 years, 22–39 years, and ≥ 40 years. Primary outcomes included 24-hour and 30-day mortality, intensive care unit admission (ICU), and hospitalization ≥ 7 days.

Results: Of 4905 casualties, 40.4% were 18–21 years of age, 54.2% were 22–39, and 5.4% were ≥ 40. Injury severity, evacuation times, pre-hospital interventions, and admission vital signs were similar across groups. Adjusted analyses showed no significant age-related differences in mortality, ICU admission, or prolonged hospitalization. Subgroup analysis of casualties with injury severity score ≥ 16 yielded comparable results.

Conclusions: In this large military trauma cohort, no significant association was found between age and mortality, ICU admission, or prolonged hospitalization. These findings were observed in a generally healthy military population receiving organized trauma care and suggest that, within this context, chronological age alone may not be an appropriate criterion for determining reserve service eligibility.

Operational forces increasingly face concurrent sleep restrictions and thermal strain, yet mission planning lacks field-relevant guidance on their combined cognitive effects and management. This critical narrative review synthesizes laboratory, field, and military-relevant evidence on how sleep loss and heat stress affect sustained attention, drowsiness, reaction time, executive control, and feedback-guided decision making. Sleep deprivation produces dose-responsive vigilance instability across total sleep deprivation and chronic partial restriction, with lapses and response-time variability providing sensitive monitoring endpoints. Heat stress produces task-dependent cognitive costs. Simple reaction time may remain relatively preserved during modest strain, whereas executive control, working memory, inhibition, and cognitive flexibility appear more vulnerable as physiological reserve narrows, particularly during dehydration, exertion, and protective equipment use.

Military multistressor studies show broad cognitive deterioration when sleep restriction co-occurs with heat, dehydration, undernutrition, and sustained workload. However, bundled designs cannot determine whether sleep and heat act additively, synergistically, or through threshold-dependent interactions. Key gaps include factorial sleep × heat trials, standardized cognitive batteries, mechanistic telemetry, and prospective modeling of moderators such as trait-like sleep-loss vulnerability, baseline sleep debt, chronotype, heat acclimation, hydration practices, protective-equipment burden, and sex. Commanders and medical planners should treat concurrent sleep restriction and thermal strain as a compounded operational risk state and apply layered controls, including protected sleep, scheduling, cooling, hydration, work-rest cycles, objective vigilance screening, task rotation, and supervisory cross-checks for high-consequence decisions.

Background: The management of symptomatic abdominal aortic aneurysms (AAA) remains a surgical challenge.

Objectives: To compare the outcomes of endovascular aneurysm repair (EVAR) versus open surgical repair (OSR) in patients with symptomatic AAA.

Methods: Patients treated for symptomatic AAA between April 2020 and April 2025 were retrospectively analyzed, comparing perioperative mortality and major adverse events between EVAR and OSR.

Results: A total of 494 AAA patients were identified, 49 (9.9%) were symptomatic (40 [81.6%] EVAR group, 9 [18.4%] OSR group). Patients undergoing OSR had a higher rate of juxtarenal involvement (OSR 6/9 [66.7%] vs. EVAR 3/40 [7.5%]; P < 0.001). Any signs of rupture were more prevalent in the EVAR group (27/40 [67.5%] vs. OSR 2/9 [22.2%]; P = 0.013). Technical success was achieved in 83.7% (n=41/49). In-hospital mortality was 22.4% (n=11/49), with no difference between groups (EVAR 9/40 [22.5%] vs. OSR 2/9 [22.2%]; P = 0.986). At logistic regression analysis, open repair was associated with a significantly higher risk of major complications (odds ratio [OR] 16.9, 95% confidence interval [95%CI] 1.79–158.3, P = 0.013), and a shock index > 0.9 remained an independent predictor of intra-hospital mortality (OR 372.5, 95%CI 1.58-87889.4, P = 0.034). During a mean follow-up of 28.8 ± 18.6 months, late mortality was 18.4% (n=7/38). Estimated survival analysis over 60 months did not demonstrate a significant difference between groups (log-rank test, P = 0.317).

Conclusions: Both EVAR and OSR yield satisfactory technical outcomes. Hemodynamic instability at presentation remains a critical predictor of mortality.

We report the first successful implantation of the CARMAT Aeson® total artificial heart (TAH) in Israel, performed as a bridge to transplantation in a patient with advanced biventricular heart failure and severe right ventricular dysfunction precluding left ventricular assist device (LVAD) therapy. The CARMAT Aeson® TAH is a next generation bioprosthetic device equipped with biological valves, hemocompatible membranes, and an integrated sensor array that enables autoregulation of stroke volume to balance left and right circulation, thereby reducing thrombogenicity and improving physiological adaptation. Following implantation, the patient demonstrated rapid hemodynamic stabilization, complete weaning from inotropes, and marked functional recovery. Remarkably, during the index hospitalization he underwent successful elective inguinal hernia repair under general anesthesia, a procedure previously deemed prohibitive due to high cardiovascular risk. This patient is the first CARMAT TAH recipient to undergoing a non-cardiac surgical procedure. Perioperative interruption of anticoagulation was achieved safely without thromboembolic complications, underscoring the device’s biocompatibility and reduced thrombogenicity compared with continuous-flow VADs. The patient was discharged home on postoperative day 61 in an ambulatory state, clinically stable, and remains actively listed for heart transplantation. This case highlights the feasibility and safety of the CARMAT Aeson® TAH in patients with end-stage biventricular failure, with potential advantages over continuous-flow devices, including pulsatile physiology, autoregulation, and reduced risk of bleeding or thrombotic complications. These advantages strengthen its role as an important bridging strategy to heart transplantation.

Background: Transgender and gender diverse (TGD) adolescents often experience higher rates of psychiatric co-morbidities, autism spectrum disorder (ASD), and autistic traits. A few studies have described TGD adolescents who were referred to psychiatric clinics. To the best of our knowledge, no study has yet compared clinical characteristics of autistic vs. nonautistic TGD adolescents.

Objectives: To describe the demographic and clinical characteristics of TGD adolescents referred to a tertiary child and adolescent psychiatric clinic, and to compare the characteristics of autistic and nonautistic TGD adolescents.

Methods: We conducted a retrospective study of 28 TDG adolescents who were consecutively referred for psychiatric evaluation in a child and adolescent psychiatric clinic at a tertiary children's hospital between December 2020 and February 2023. Data were collected from electronic medical files.

Results: Of the sample, 67.9% first questioned their gender identity after the onset of secondary sex characteristics (pubertal onset) and 35.7% were identified as gifted. The gifted group had a higher rate of pubertal onset compared to the nongifted group. Our cohort exhibited a higher rate of ASD (39.3%) than the general population. Autistic compared to nonautistic TGD adolescents had a higher rate of giftedness and a lower rate of social transition.

Conclusions: TGD adolescents referred for psychiatric evaluation display distinct features, including high rates of ASD, giftedness, and pubertal onset. Autistic compared to nonautistic TGD are more likely to be gifted and less likely to have undergone social transition.

Background: Transcatheter aortic valve implantation (TAVI) has become the preferred therapeutic method for elderly patients presenting with severe symptomatic aortic stenosis (AS). Most TAVI procedures are performed in patients between 75–85 years of age. A few publications exist on TAVI in patients over 90 years, yet the outcome and complication rates are inconsistent.

Objectives: To identify all patients with AS who underwent TAVI between 2019 and 2020, specifically those age > 90 years at the time of the TAVI.

Methods: We reviewed the Maccabi Healthcare Services database for all severe/critical AS patients who underwent TAVI between 2019 and 2020, specifically those age > 90 years at the time of TAVI. These patients were compared to all patients aged 80–89 years who underwent TAVI during the same time. Follow-up ended on 31 December 2022. We compared mortality and complications rates in nonagenarians vs. those 80–89 years and evaluated the change in left ventricular ejection fraction before and after the procedure.

Results: We identified 36 nonagenarians who underwent TAVI during the study period, mean age 92.3 years, male:female ratio 15:21. During a mean follow-up period of 3 years, 44% of nonagenarians died, 26% of the control patients died (P < 0.01).

Conclusions: TAVI in nonagenarians is feasible. Total mortality during follow-up was significantly higher in nonagenarians. Overall complication rates were also higher in nonagenarians, mostly due to vascular complications. Left ventricular dysfunction appeared to improve after TAVI, even in nonagenarians.

Methotrexate, a folate analog antimetabolite, is one of the oldest cytotoxic drugs still in use. It is active against a variety of malignancies including bladder and breast cancer, head and neck tumors, gestational choriocarcinoma, osteogenic sarcoma, lymphomas, and leukemias.

Methotrexate is given mostly intravenously (IV), usually at standard doses (milligrams). It can also be delivered in much higher doses (grams), which is known as high-dose methotrexate (HDMTX). The intrathecal (IT) route is used particularly in children with acute lymphoblastic leukemia (ALL) and in adults with meningeal carcinomatosis. The drug may be administered orally as well, mainly in non-oncological conditions such as rheumatoid arthritis and other autoimmune diseases.

Background: Breast edema, characterized by fluid accumulation in breast tissue, is a common yet understudied complication following breast-conserving surgery (BCS) and radiotherapy for breast cancer. Its impact on physical and emotional well-being highlights the need for deeper exploration of its prevalence, risk factors, and clinical management.

Objectives: To evaluate the prevalence of breast edema following breast surgery, investigate its association with arm lymphedema, and explore links to surgical interventions.

Methods: We analyzed 105 breast cancer patients treated with BCS and axillary interventions, including sentinel lymph node biopsy (SLNB), lymph node sampling, or axillary lymph node dissection (ALND). Comprehensive evaluations included physical exams, arm circumference measurements, and a thorough review of patient demographics, medical history, and disease progression to assess the presence and severity of breast and arm lymphedema.

Results: Breast edema prevalence was 7.6%, with rates significantly influenced by surgical extent. None of the SLNB patients exhibited breast edema, compared to 23.5% of ALND patients. Significant predictors included arm lymphedema (OR 57.54, P = 0.024), body mass index (OR 0.65, P = 0.016), and tumor grade (OR 51.78, P = 0.040). Co-occurrence of breast and arm lymphedema was observed in 50% of cases.

Conclusions: Breast edema is a significant postoperative complication influenced by surgical extent and lymphatic disruption. Improved diagnostic methods, multidisciplinary care, and innovative surgical strategies are essential for mitigating this condition and enhancing patient outcomes.

Background: Mycosis fungoides (MF) combined with photosensitive/autoimmune diseases has been reported, yet there are limited data regarding the therapeutic considerations in these patients, specifically phototherapy, a mainstay skin-directed treatment (SDT), being a relative or complete contra-indication.

Objectives: To outline therapeutic considerations for patients with MF who had also been diagnosed with photosensitive/autoimmune diseases.

Methods: We conducted a retrospective analysis of patients with MF who were treated at our center between January 2008 and December 2024with photosensitive/autoimmune diseases, especially collagen vascular diseases (CVD) or autoimmune bullous diseases (AIBD),

Results: Eight patients were diagnosed with MF at a median age of 39 years. Seven had early-stage (4-IA, 3-IB) and one had Sézary syndrome. Six early-stage MF patients were diagnosed with lupus erythematosus (LE, 4) or AIBD (2) and were treated with SDT (topical corticosteroids/chlormethine gel), systemic retinoid or methotrexate. A patient with resistant early-stage MF and discoid LE was treated with electron beam and interferon. One patient who presented with variegate porphyria and localized MF was treated with electron beam. The patient with Sézary syndrome had inclusion body myositis. He was treated with low-dose total skin electron beam, methotrexate, extracorporeal photopheresis, and subsequently with romidepsin. After a median of 8 years, no stage progression of MF was observed. The Sézary syndrome patient achieved down-staging and was at stage IB. There was no aggravation of the co-morbidity in any of the patients.

Conclusions: Effective management of MF and associated photosensitive or autoimmune co-morbidities underscore the need for individualized treatment strategies in patients with these unique dual diagnoses.

Background: Radiofrequency-skin interaction is considered self-limited for treating acquired pigmentation such as melasma. Alternatively, skin perforation with microneedling radiofrequency (MNRF) may increase skin bioavailability for depigmenting-mediated ingredients or drugs for the treatment of melasma.

Objectives: To examine the clinical feasibility of topical tranexamic acid (TA) mediated with MNRF-assisted transepidermal delivery in patients with mixed melasma.

Methods: The study protocol included 14 women with centrofacial or malar pattern of distribution of melasma (skin types II-VI; age 35–48 years). Patients underwent four treatments at 3-week intervals between treatments. Treatment protocol included non-insulated MNFR (Intensif, EndyMed Ltd, Caesarea, Israel) followed by TA (hexakapron 4%) solution application. The improvement was evaluated based on clinical photographs (Quantificare, Biot, France) and modified Melasma Area and Severity Index (mMASI) scores. Baseline Photographs were analyzed 3 months after the last treatment.

Results: In 13 patients (93%), mMASI scores were significantly lower after 3 months (mean 3.6) than at baseline (5.22). In one patient, mMASI was higher at 3 months compared to baseline. Overall, mMASI improved by 31% (P < 0.01). Physician and patient satisfaction was high. Minimal adverse reactions were recorded.

Conclusions: MNRF-assisted transepidermal delivery with topical TA is a safe and effective modality for the treatment of melasma.

Background: Chest radiograph is a standard procedure for diagnosis of pneumonia; however, interpretation shows considerable variability among observers.

Objectives: To assess the extent of agreement between pediatric residents and board-certified radiologists in interpretation of chest radiography for detection of pneumonia. To evaluate the impact of resident experience, patient age, and signs of infection on this phenomenon.

Methods: The cohort included 935 patients with suspected pneumonia admitted to the pediatric emergency department at a non-tertiary medical center in Israel 2019–2021. All patients had chest radiographs interpreted by a resident and a radiologist. Interobserver agreement was assessed using Κ and prevalence-adjusted bias-adjusted κ (PABAK) with 95% confidence intervals (95%CI). Results were stratified by resident experience (junior or senior), patient age (≤ 3 vs. > 3 years), white blood cells (≤ 15,000 vs. > 15,000 cells/ml), C-reactive protein (≤ 5 vs. > 5.0 mg/dl), and temperature (< 38.0°C vs. ≥ 38.0°C).

Results: Moderate agreement between pediatric residents and radiologists was demonstrated for diagnosis of pneumonia (κ= 0.45). After adjustment for disease prevalence, the extent of agreement increased to near-substantial (PABAK= 0.59, 95% confidence interval 0.54–0.64). The extent of agreement was higher for children over 3 years of age and in patients without clinical or biochemical features of pneumonia, especially when diagnosis of pneumonia was ruled out.

Conclusions: A second reading of chest radiographs by an experienced radiologist should be considered, particularly for patients younger than 3 years of age and in those with signs of infection and an initial diagnosis of pneumonia.

Background: Prognostication is complex in patients critically ill with coronavirus disease 2019 (COVID-19).

Objectives: To describe the natural history of ventilated critical COVID-19 patients.

Methods: Due to our legal milieu, active withdrawal of care is not permitted, providing an opportunity to examine the natural history of ventilated critical COVID-19 patients. This retrospective cohort included COVID-19 ICU patients who required mechanical ventilation. Respiratory and laboratory parameters were followed from initiation of mechanical ventilation for 14 days or until extubation, death or tracheostomy.

Results: A total of 112 patients were included in the analysis. Surviving patients were younger than non-survivors (62 years [range 54–69] vs. 66 years [range 62–71], P = 0.01). Survivors had a shorter time to intubation, shorter ventilation duration, and longer hospital stay. Respiratory parameters at intubation were not predictive of mortality. Nevertheless, on ventilation day 10, many of the ventilatory parameters were significantly better in survivors. Regarding laboratory parameters, neutrophil counts were significantly higher in non-survivors on day 1 and C-reactive protein levels were significantly lower in survivors on day 10. Modeling using a generalized estimating equation showed small dynamic differences in ventilatory parameters predictive of survival.

Conclusions: In ventilated COVID-19 patients when there is no active care withdrawal, prognostication may be possible after a week; however, differences between survivors and non-survivors remain small.