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Biomedical subjects

P Bray

Publications and source records attributed to P Bray.

32 records · Page 2Linked to original sources
PubMed1986

Acoustic emission cochleography--practical aspects.

Otoacoustic emissions are discussed as a means of objectively examining cochlear status. Practical uses of otoacoustic emission recording are reviewed, and the technical requirements of a clinical test are discussed. Details are given of an advanced cochlear echo test procedure, and results from normal and hearing impaired ears are discussed. Finally the alternative technique of distortion product analysis is discussed and results are given.

Biomechanical Phenomena↗
PubMed1985

Delayed treatment of serious decompression sickness.

We report the cases of three patients with residual symptoms from diving decompression sickness, each of whom presented to a recompression chamber three to seven days following original exposure. All three had complete resolution of symptomatology despite the delayed treatment. The late resolution of symptoms is evidence both of residual bubble effect and of distal tissue hypoxia responding to oxygen therapy with the recompression. We recommend that decompression sickness symptoms be treated whenever they are seen, even ten to 14 days postinjury.

Adult↗
PubMed1983

Orogenital sex as a cause of nonfatal air embolism in pregnancy.

A case of nonfatal air embolism from orogenital sex in the 30th week of pregnancy is described. Because of a delay in the diagnosis, the patient did not receive hyperbaric oxygen therapy until 39 hours after the incident. Severe neurologic dysfunction persisted despite hyperbaric therapy. The world literature on orogenital sex in pregnancy with resultant air embolism is reviewed. The pathophysiology of air embolism and the rationale for hyperbaric oxygen treatment are presented. It is strongly recommended that survivors of this form of air embolism be transferred to hyperbaric facilities as soon as possible to reduce the long-term neurologic sequelae.

Adolescent↗
PubMed1977

Hereditary hemochromatosis. Diagnosis in siblings and children.

We studied five patients with clinically manifest hemochromatosis and 19 of their siblings and children to define better the diagnostic criteria for stages of the disease. The earliest detectable abnormalities were an increase in hepatic-parenchymal-cell stainable iron, hepatic iron concentration, transferrin saturation and serum iron concentration. In contrast, urinary iron excretion after deferoxamine and serum ferritin concentration were usually normal in early iron loading. In either latent or clinically manifest disease, hepatic-parenchymal-cell stainable iron was Grade 3 or 4; hepatic iron concentration was greater than 250 microng per 100 mg; serum iron was greater than 170 microng per 100 ml; transferrin saturation was greater than 70 per cent; urinary iron excretion exceeded 2.2 mg per 24 hours; and serum ferritin usually exceeded 1000 ng per ml. Estimation of liver iron is the most sensitive method for detecting early disease. Urinary iron excretion and serum ferritin estimate the total body burden of iron in latent and clinically manifest disease.

Adolescent↗
PubMedDate not supplied

Effects of rotation on the sleep state-dependent midlatency auditory evoked P50 potential in the human.

Sopite syndrome, characterized by loss of initiative, sensitivity to normally innocuous sensory stimuli, and impaired concentration amounting to a sensory gating deficit, is commonly associated with Space Motion Sickness (SMS). The amplitude of the P50 potential is a measure of level of arousal, and a paired-stimulus paradigm can be used to measure sensory gating. We used the rotary chair to elicit the sensory mismatch that occurs with SMS by overstimulating the vestibular apparatus. The effects of rotation on the manifestation of the P50 midlatency auditory evoked response were then assessed as a measure of arousal and distractibility. Results showed that rotation-induced motion sickness produced no change in the level of arousal but did produce a significant deficit in sensory gating, indicating that some of the attentional and cognitive deficits observed with SMS may be due to distractibility induced by decreased habituation to repetitive stimuli.

Adult↗