Acute care for exercise-induced hyperthermia to avoid adverse outcome from exertional heat stroke.

INTRODUCTION: Exertional heat stroke (EHS) is a major concern in military trainees performing intense physical exercise, with substantial morbidity rates. Prehospital diagnosis of EHS is essentially clinical. Thus, soldiers, command personnel, and medical staff are taught to recognize this injury and immediately begin aggressive treatment to prevent further deterioration. PATIENTS AND METHODS: During 2007, 5 otherwise healthy Israeli Defense Forces (IDF) soldiers were diagnosed with EHS while performing strenuous exercise. They were treated vigorously according to the IDF EHS-treatment protocol and were referred to the emergency department. RESULTS: On arrival at the emergency department, physical examination including rectal temperature was unremarkable in all soldiers. Blood and urine workup showed near-normal values. No other medical conditions that could have explained the clinical presentation were found. All soldiers were discharged shortly afterward, with no further consequences. A heat-tolerance test was performed several weeks after the event and was interpreted as normal. All soldiers returned to active service. CONCLUSION: Because the initial clinical findings were very suggestive of EHS and because no other condition could have explained the prehospital transient hyperthermia, we suggest that these soldiers were correctly diagnosed with EHS, and we propose that rapid vigorous cooling prevented further deterioration and complications. We suggest calling this condition aborted heat stroke.

Hard times call for creative solutions: medical improvisations at the Israel Defense Forces Field Hospital in Haiti.

Mass disaster medicine is characterized by the need to manage limited resources that are far inadequate to meet the population's demands. Under these hectic conditions, lack of specific medical equipment is expected and requires improvisation using available items. We describe the innovative use of medical improvisations at the Israel Defense Forces field hospital, working in the earthquake zone, Port-au-Prince, Haiti, on January 2010. Creative solutions were found to several problems in a variety of medical fields: blood transfusion, debridement and coverage of complex wounds, self-production of orthopedic hardware, surgical exposure, and managing maxillofacial injuries. We hope that the methods described will help to inspire medical teams working in disaster regions.

Vestibular evoked myogenic potentials and saccular plasticity in divers.

INTRODUCTION: Otolith function, which is dependent on linear velocity and acceleration, may be expected to change in underwater divers, who are submerged in a medium that is denser than air. The purpose of the present study was to examine possible changes in the sacculocollic reflex of professional divers and to investigate whether there might be diving-induced adaptation of the saccular response. METHODS: We used the vestibular evoked myogenic potential (VEMP) response to evaluate saccular function in 12 professional divers shortly after a dive and after an interval of at least 24 h. The control group consisted of 12 matched non-divers. Wave latencies and amplitudes, asymmetry ratio, and the response threshold were compared between the groups. RESULTS: Statistically significant shortening of N23-wave latency was found in the divers compared with the control group. The mean +/- SE were 22 +/- 0.1 and 22.1 +/- 0.7 ms early and late after a dive in the divers group vs. 24.5 +/- 0.5 ms in the control group. No significant differences were found in any of theVEMP parameters between the early and late post-dive recordings. DISCUSSION: We suggest that the reduction in N23 latency reflects long-term adaptation of the sacculocollic reflex to underwater conditions. Increased sensitivity of the reflex is required to compensate for the decrease in linear velocity and acceleration, resulting in reduced stimulation of the otolith organ.

Hemifacial spasm associated with otitis media with effusion: a first reported case.

Hemifacial spasm is a condition consisting of unilateral paroxysmal involuntary contractions of the muscles innervated by the facial nerve. The most common etiology is a vascular loop compression at the root exit zone of the nerve. We present here a first reported case of hemifacial spasm associated with otitis media with effusion, in a 6-year-old girl, which was relieved immediately following ventilation tubes insertion. A proposed mechanism is described.

Group-A streptococcal meningitis in an adult, secondary to purulent otitis media.

Group A streptococcal meningitis is rarely encountered today, although group A streptococcal severe infections are on the increase. We present here a case of an adult male with bacterial meningitis as a complication of otitis media induced by Group A Streptococcus. The approach to diagnosis and treatment considerations are discussed.

Performance of infusion pumps during hyperbaric conditions.

BACKGROUND: Many hyperbaric facilities use infusion pumps inside the chamber. It is therefore important to ensure that this equipment will perform accurately during hyperbaric conditions. The authors tested the function and accuracy of the Imed 965 and Infutec 520 volumetric infusion pumps, the Easy-pump MZ-257 peristaltic infusion pump, and the Graseby 3100 syringe pump. METHODS: The authors calculated the deviations of infused volumes at low and high rates (12-18 and 60-100 ml/h) on three different hyperbaric protocols (up to 2.5, 2.8, and 6 atmospheres absolute [ATA]), resembling a standard hyperbaric oxygen treatment and US Navy treatment tables used for decompression illness and for arterial gas embolism. Two examples of each pump model were examined in every experiment. RESULTS: The Easy-pump MZ-257 failed to function completely beyond a chamber pressure of 1.4 ATA, making it unsuitable for use inside the hyperbaric chamber. The Graseby 3100 failed to respond to all keyboard functions at 2.5-2.8 ATA, making it unsuitable for use in most hyperbaric treatments. The Imed 965 performed within an acceptable volume deviation (< or =10%) during most hyperbaric conditions. During the compression phase of the profiles used, and for the low infusion rates only, exceptional volume deviations of 20-40% were monitored. The Infutec 520 demonstrated an acceptable deviation (within 10%) throughout all the hyperbaric profiles used, unaffected by changes in ambient pressure or infusion rate. CONCLUSIONS: Commercially available infusion pumps operating during hyperbaric conditions demonstrate substantial variations in performance and accuracy. It is therefore important that the hyperbaric facility staff make a careful examination of such instruments to anticipate possible deviations in the accuracy of the equipment during use.