During three years from 1982 to 1985, sixty six patients （sixty Bell's palsy and six Ramsay Hunt syndrome） received hyperbaric oxygen therapy （OHP）.
Among fifty four Bell's palsy visted Kure National Hospital within two weeks after onset, forty five showed complete recovery （83%）, seven cases were fairly good recovery and two showed poor recovery.
Twenty seven Bell's palsy were classified into three types by EMG and evoked EMG. In Type I （neurapraxia）, all patients recovered completely within thirty days. In Type II （incomplete denervation）, eleven out of fourteen showed complete recovery, but recoverying period prolonged.
OHP is well indicated for peripheral facial palsy and can reduce the period to get relief.

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Two cases of suicidal hanging were reported, which received hyperbaric oxygen therapy（HBO）. One case had had already brain damage in left hemisphere due to intracerebral hematoma before hanging. After suicidal attempt, both cases became coma and no clinical improvement was recog nized by HBO. Severe brain edema and low density area in brain stem were noted on CT scan, which suggested occlusion of internal carotid and vertebral artery by hanging. One case went into vegetative state, and another died five days after hanging.
EEG and SEP were recorded before, during and after HBO to evalauate latent changes of brain function. EEG and SEP were almost flat before HBO. Significant improvement on EEG was not observed during and after HBO, however, SEP was improved during HBO in both cases, and the functional reversibility (ischemic penumbra) was suspected. But, the improvement of SEP was transient, and disappeared just after HBO.
Thusly, therapeutic effect of HBO could not be confirmed in such severe cases. And, EEG and SEP was considered to be useful to evaluate the indicationability of HBO for such cases.

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No effective therapy has yet been established for hepatic failure which causes death in liver cirrhosis.
OHP was performed for ten cases of hepatic failure which was seen in end stage of liver cirrhosis and the effect was evaluated using Pugh's classification of severity, HPT, LCAT, serum total bile acids（TBA）and its fractions（C/CDC ratio, G/T ratio）.
The results revealed that seven out of ten cases, especially three severe cases, showed improvement in Pugh's categorization. Improvement was also observed in C/CDC ratio, HPT and LCAT. These facts suggest that OHP may act as effective for hepatic failure in liver cirrhosis by retaining reserving capability of liver.

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A Deep Diving Simulator（DDS）was completed in June, 1985, at MSDF Undersea Medical Center in Yokosuka. Main purposes of DDS are to educate and train deepsea divers and personnel for saturation diving operation, to conduct research related underwater physiology and psychology, and to study human factor engineering of diving equipments. The DDS comprises a hyperbaric chamber complex, main control room, life support and environmental control system, high pressure gas storage area and supply system, and Environmental-Biological Information Processing System （EBIPS）. The hyperbaric chamber complex consists of two deck decompression chambers（DDC）, center lock（CL）that connects two DDCs, personnel transfer capsule（PTC）, and wet pot（WP）that is separated from DDCs. The PTC transfers three divers from the CL to the WP for excursion diving. The EBIPS is composed of vital sign, body heat loss and high pressure nervous syndrome （HPNS）section, and provides on-line analysis of ongoing measurement data as well as data logging for future study. The EBIPS was run for the first time during a 100 meters simulated saturation diving in October, 1985. Although the system has not been completed in computer programming, its function seemed to be satisfactory.

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A large multiplace hyperbaric chamber was newly installed at Ryukyu University Hospital, when the hospital moved to a new campus area. This is a detailed report about the facility.
This chamber is designed as laterally cyrindrical shape having two components in it. It measures 3.2 meters in diameter and 7.7 meters in length. It has maximum capacity for fourteen patients and the deepest available pressure is 5.0 kg/cm²（6 ATA）. Outer lock can realize hypobaric condition（190 Torr）equivalent to 10,000 meters altitude.
This chamber has many advanced equipments as; the large automatic sliding door which can be used both for hypo-and hyperbaric condition, the computer system to regulate the environmental condition of the chamber and also to control therapeutic patterns, many medical equipments to monitor respiratory and circulatory function of the patients, and others.

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According to the analysis of diving profiles and real working conditions of divers, underwater work was proved to be considerably hard and to give heavy stress to workers. So, in this paper, through the study of diving work, regression equations were introduced to evaluate the real work load. While the mechanical pressure resistances of five different types of SCUBA regulators were examined both in dry and wet conditions from 1 to 6 ATA（Atmospheres Absolute）.
V_O2 max decreased 14% by using SCUBA regulators due to mechanical expiratory resistance. Fin-swimming decreased V_O2 more significantly as 28%. Due to the effect of pressure resistance of regulators, it is predicted that, if the diving depth is shallower than thirty meters, respiratory cycle should be kept within 30/min., and tidal volume should be under 2 liters. If the diver is forced to work under such condition as his heart rate reaches 150 beats/min., V_O2 max will decrease 23%.

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An automatic pressure regulator for the endotracheal tube cuff was developed, which can maintain cuff pressure constantly at any pre-set level regardless of the ambient（chamber）pressure change during OHP therapy and of the diffusion of N₂O into the cuff during anesthesia.
This device consists of a pressure reducing valve a pressure, setting dial and a fail-safe system.
This device is placed between the hospital piping system and the inflating line of the endotracheal tube and can continuously supply low pressure, low flow gas to the cuff to maintain cuff pressure at any desired level. Excess gas is released from the system simultaneously.
When the ambient pressure increases, the pressure regulator of this system senses the change and supplies extra gas to the cuff, so that relative gradient between the intra-cuff pressure and ambient pressure is kept constant. This device has the fail-safe system which works when pressure of the hospital piping system decreases abnormally.
So far no trouble has been encountered in using the pressure regulator during OHP therapy.

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It is important to decide amputation level appropriately for patients of chronic occlusive disease of peripheral artery, whose ulcer and necrosis showed no improvement and resisted to all the preceded treatments.
In seven patients, transcutaneous oxgen pressure （tcPO₂）was measured under hyperbaric oxygenated（HBO）condition around predetermined amputation level and the relationship between tcPO₂ and surgical results were investigated.
In two patients, after the first amputation failed, they were forced to receive another amputation later at the more proximal level. Before the first amputation, tcPO₂ under HBO（2 ATA） was under 200mmHg around amputation level and that of second surgery was over 200mmHg. Five patients showed complete relief by only one amputation surgery and their tcPO₂ was over 200mmHg.
This results show that, if tcPO₂ at amputation site can exceed 200mmHg under 2 ATA of HBO condition, it seems to promise fair surgical result. Therefore, tcPO₂ can be concluded as useful index to determine amputation level accurately for such vascular disorder.

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