Balloon Eustachian tuboplasty in a professional Navy SEAL diver: case report.

Middle ear barotrauma due to dilatory Eustachian tube dysfunction (ETD) is probably the most common medical disorder related to diving. Moreover, ETD makes divers prone to other diving-related accidents, including inner ear barotrauma and alternobaric vertigo. Until the development of Eustachian tube balloon dilation no diving-compatible surgical options existed to effectively and safely prevent recurrence.

Evaluating the risk of decompression sickness for a yo-yo dive using a rat model.

Purpose: The frequent ascents made during yo-yo diving may contribute to gas bubble clearance but paradoxically may also increase the risk of central nervous system decompression illness (DCI). We evaluated the risk of DCI due to yo-yo dives with very short surface intervals, using a controlled animal model.

Methods: Dives were conducted on air to a depth of 90 meters (10 atmospheres absolute) for 32 minutes of bottom time, at a descent/ascent rate of 10 meters/ minute.

The Effect of Aging on the Ventilatory Response to Wearing a Chemical, Biological, Radiological, and Nuclear Hood Respirator at Rest and During Mild Exercise.

Background: Structural changes in the human body resulting from aging may affect the response to altered levels of O and CO. An abnormal ventilatory response to a buildup of CO in the inspired air due to rebreathing may result in adverse effects, which will impair the individual's ability to function under stress. The purpose of this study was to evaluate the effect of age on the respiratory response to wearing an escape hood at rest and during mild exercise.

Artificial horizon effects on motion sickness and performance.

Hypothesis: To investigate whether the projection of Earth-referenced scenes during provocative motion can alleviate motion sickness severity and prevent motion sickness-induced degradation of performance.

Background: Exposure to unfamiliar motion patterns commonly results in motion sickness and decreased performance.

Methods: Thirty subjects with moderate-to-severe motion sickness susceptibility were exposed to the recorded motion profile of a missile boat under moderate sea conditions in a 3-degrees-of-freedom ship motion simulator.

Half-time SPECT acquisition with resolution recovery for Tc-MIBI SPECT imaging in the assessment of hyperparathyroidism.

Purpose: Reduced SPECT acquisition time protocols have been recently developed based on collimator-detector response compensation reconstruction. The present study aims to evaluate the potential use of a short-time technetium-99m methoxyisobutylisonitrile (Tc99m-MIBI) SPECT algorithm in the investigation of parathyroid adenoma (PTA).

Procedures: Ninety patients (59 women; age range, 21-76 years) with biochemical evidence of hyperparathyroidism were referred for Tc99m-MIBI scintigraphy for diagnosis and localization of PTA.

Abrupt tonsillar hemorrhage from a metastatic hemangiosarcoma of the breast: case report and literature review.

We describe a case of primary breast hemangiosarcoma with tonsillar metastasis that manifested as a profuse oropharyngeal hemorrhage. The patient was a 54-year-old woman who presented to the emergency department with oral bleeding. A thorough examination revealed a distorted morphology of the left tonsil and a hemorrhage originating from it.

Postural dynamics and habituation to seasickness.

The computerized dynamic posturography (CDP) test examines the response pattern to simultaneous, multimodal sensory stimulation. The purpose of this prospective, controlled study was to investigate whether postural dynamics evaluated by CDP are related to seasickness severity and the process of habituation to sea conditions. Subjects included 74 naval personnel assigned to service aboard ship and 29 controls designated for shore-based positions.

Safety of double-dose transdermal scopolamine.

Study Objective: To evaluate the safety of double-dose transdermal scopolamine patch therapy.

Design: Randomized, crossover, double-blind study.

Setting: Motion sickness clinic in Haifa, Israel.

Ondansetron for the prevention of seasickness in susceptible sailors: an evaluation at sea.

Background: Seasickness is a common problem, causing a significant decrement in performance among naval crew. In about 20-60% of crewmembers, symptoms appear with varying intensity depending on the sea state and the duration of the voyage. Recent studies have suggested antiemetic 5HT3 blockers as a possible treatment for motion sickness, emphasizing their minor clinical and cognitive side effects.

Seasickness pathogenesis and the otolithic organs: vestibular evoked myogenic potentials study--preliminary results.

Background: Seasickness is thought to result from conflicting inputs from the vestibular, visual and somatosensory systems. The otolithic organs, which are responsible for the sensation of linear acceleration and tilt, are important in the pathogenesis of seasickness. The vestibular evoked myogenic potentials test is an objective evaluation of saccular function.

Vestibular evoked myogenic potential threshold and seasickness susceptibility.

Numerous attempts have been made to find physiological parameters that might predict susceptibility to seasickness. However, to date, no physiological index has been found that can serve as a diagnostic tool for individual susceptibility to motion sickness at the personnel selection stage. A number of studies have demonstrated that linear acceleration in the vertical plane is the most provocative stimulus of motion sickness.

Pre-Labor exposure to carbon monoxide: should the neonate be treated with hyperbaric oxygenation?

A woman was admitted to hospital in the 39th week of gestation due to syncope, followed by nausea and headache. The patient's history revealed a 10-hour, unintentional exposure to carbon monoxide (CO), secondary to burning charcoal for indoor heating. Because of monitored fetal distress, a cesarean section was performed.

Inner ear decompression sickness and mal de debarquement.

Objective: To present a case series of vestibular symptoms appearing after combined sailing and diving activity, and to discuss the differential diagnosis and the workup algorithm.

Study Design: Case series.

Setting: Tertiary referral center.