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To Learn more about affordable HBOT and Children's Hyperbaric Coop at Miracle Mountain, CLICK HERE
To Learn more about affordable HBOT and Children's Hyperbaric Coop at Miracle Mountain,
July, 1998

26381 Crown Valley Parkway, Suite 130
Mission Viejo, CA 92691


Fifty stable, chronic stroke and traumatic brain injury (TBI) patients (mean age 62, mean duration post stroke 29
months) were treated with a combination of hyperbaric oxygen, physical therapy and EEG biofeedback for two
months. Surveys given to patients or their family members showed that 96.7% of the patients improved one or more
of their lost or diminished functions. Pre- and post-treatment, physical therapy evaluations indicated that 100% of the
patients experienced improvements in one or more functions. These results suggest hyperbaric oxygen therapy
along with other modalities provide safe and efficient treatment of stroke or TBI related disabilities.


Health institutes have shown different efforts to improve the quality of daily life for stroke patients. However, the
general outcome is not a encouragement, especially for those of long term stroke or brain injury related disorders
(TBI) patients. Although stroke is a leading cause of death and disability, its post management was often marked by
feelings of hopelessness.

Hyperbaric oxygen therapy (HBO) uses oxygen under pressure and first clinical use of hyperbaric oxygen for
treatment of stroke and TBI patients was reported in 1965. Since then many studies have demonstrated its safety
and efficacy (1,2,16-20). It is expected that HBO will be a competitive therapy for this devastating neurological

The dominant theory of stroke and TBI for more than 100 years has been that the loss of function is largely related to
the death of brain cells due to the interruption of blood flow and the resulting lack of oxygen to a part of the brain.
This traditional concept of infarction is being challenged by a theory which has been slowly evolving over the past 25
years. This theory states that the death of brain cells occurs only when the flow of blood falls below a certain level
(approximately 8-10 ml/100 gr./min., while at slightly higher levels of blood flow the tissue remains alive but not able
to function. Thus in the acute stroke the affected central core of brain tissue dies while the more peripheral tissues
may remain alive for many years after the initial insult, depending on the amount of blood the brain tissue receives

Brain areas that are injured and are not receiving enough blood flow as a result of the stroke or trauma are now
referred to as the "ischemic penumbra". This is the area that surrounds the central core of infarcted (dead) tissue.
These "rim" tissues do not receive enough oxygen to function but do receive enough to stay alive. These brain cells
have been described as "sleeping beauties", "sleeping neurons" or "dormant" or "idling neurons". These neurons
are nonfunctional but anatomically intact and can be revived. ( 3), (8-10).

It is widely recognized that damaged blood vessels are thought to produce the ischemic penumbra in stroke or TBI.
In the acute phase of stroke or TBI, those damaged blood vessels lead to significant edema (swelling of the tissues
as a result of the damage). This swelling may take up to 9 to 12 months to resolve, and the swelling compresses brain
blood vessels, limits the flow of blood to the damaged tissues. As the swelling goes away, some of the blood vessels
will regain their original diameters and normal blood flow will resume (9). It was widely documented that the water
content of edematous tissue of the brain was decreased significantly by HBO. (12-14).

Another process is "neovascularization", also known as "angiogenesis". This is the process of forming new
capillaries that extend from the surrounding healthy brain tissue into the areas of the ischemic penumbra. The
outermost portions of the ischemic penumbra (those portions closest to normal brain tissue) are able to metabolize
but at a reduced rate than normal tissues, however, they are receiving more blood and oxygen than the centrally
located ischemic tissues. Adenosine, a metabolite of ATP, is released from ischemic "rim" tissues when cells
metabolism and repair. Adenosine is a vasodilator that stimulates new capillaries to grow into the ischemic penumbra
(neovascularization). Thus during the first year after a stroke or TBI, new blood vessels are stimulated to move into
the ischemic penumbra to re-supply it with a new blood supply. (9)

Unfortunately, the ischemic penumbral tissues closer to the infarct area usually are not receiving enough oxygen or
nutrients to generate adequate amounts of ATP - either from aerobic or anaerobic metabolism for neovascularization
to occur. Due to the lack of ATP formation, adenosine is not produced and the formation of new capillaries does not
occur. Thus the ischemic penumbra remains ischemic and static since the process of neovascularization is not able to
be completed. This often results in a substantial amount of brain tissue that remains ischemic and non-functioning in
the chronic stroke and TBI patients. This failure of natural healing processes is due ultimately to damaged blood
vessels and their inability to provide oxygen and nutrients to those portions of the brain that are damaged.(11)

Hyperbaric oxygen works to improve chronic stroke and TBI patients by regenerating, repairing and generating new
blood vessels to the injured parts of the brain. In the ischemic penumbra, the blood vessels are often constricted to
the point that red blood cells can not pass through them. This creates the situation where only plasma is able to pass
slowly to part or most of the ischemic area. Since plasma has nutrients, the tissues of the ischemic penumbra are able
to remain alive by using anaerobic glycolysis (metabolism without oxygen) also known as fermentation.. Anaerobic
glycolysis only produces 2 moles of ATP per mole of glucose metabolized instead of the 36 moles of ATP formed
when oxygen is present. Thus the tissues suffer from a chronic shortage of ATP and its subsequent metabolite-
adenosine. Hyperbaric oxygen forces oxygen into the plasma to such a degree that as the plasma passes into the
ischemic penumbra, the ischemic tissue begins to receive enough oxygen for aerobic glycolysis (metabolism that
uses oxygen) to occur once more. This creates a surge of ATP production in the ischemic tissue which continues to
be produced as long as the patient is within the hyperbaric oxygen chamber. When the patient is taken out of the
chamber, blood and tissue levels of oxygen fall back to pre-treatment levels within 4 hours. As the tissue oxygen
level falls, the newly generated ATP is used by the ischemic tissues and adenosine is released into the surrounding
tissues in an effort by the tissues to continue to receive the oxygen that it just had been receiving. As a part of this
survival mechanism, adenosine and other chemical mediators are released into the surrounding tissues stimulating
angiogenesis. Done daily over time, the HBO stimulates new blood vessels to grow into the ischemic tissues
returning them back to normal in terms of their oxygen supply. Recovery of function is associated with recovery of
local perfusion and metabolism. (11)

Once the ischemic penumbral tissues are no longer suffering from a lack of oxygen, they are able to begin to repair
their injured neurons, glial cells and extracellular matrix. These tissues now have to try to repair their own cell
bodies, dendrites, axons and synapses but also have to grow out and extend to the many lost connections that
occurred with the stroke.

Treatment of acute and chronic focal cerebral ischemia with hyperbaric oxygen has been reported both in animal and
in humans. The results of the clinical research have suggested a promising role for the use of HBO. (2, 16-20). In
this study, we showed that HBO is quite effucient when used as a part of combined therapy and patients did benefit
from this therapy.


A: Patients:

50 patients ( male 21 and female 29) voluntarily enrolled in this study. Patient's ages ranged from 31-89 years with a
mean age of 61.8 years. The duration from onset of stroke to entry into our rehabilitation program varied from 1
month to 10 years. The average duration since stroke onset was 28 months. 3 of the patients suffered chronic stroke
more than 8 years.
Table 1 : Patient's Pre-Treatment Condition

Number         Diagnosis

  9              brain hemorrhage

  4              embolic infarction

  3              stroke after brain surgery

  1              a car accident

  33             ischemic infarction (thrombosis)


B. Treatment:

1. HBO Treatment:  Patients received hyperbaric oxygen therapy (HBO) at a pressure of 1.5. to 2.0 atmospheres
absolute (ATA) in a sealed single person chamber. Oxygen (100% medical grade) was inhaled through a plastic face

The therapy was carried out for 90 minutes per day and 6 times per week in most patients. A few patients received
HBO treatment twice a day. The average number of HBO treatments completed was 55.

Hyperbaric oxygen therapy feels much like going for a ride in a modern day jet - the chamber even looks like the
cockpit of a jet fighter plane! As patients start their treatment they are sitting upright at a comfortable angle inside of
this cockpit like chamber. Patients have an oxygen mask over their mouth and nose, the door is shut and they feel a
slight movement of air as the chamber begins to be filled with more air. As the air enters the chamber you may notice
a slight discomfort in one or both ears just like they have experienced while flying in the large commercial jets.
Patients may choose to swallow, chew gum or hold their nose and blow outward to help equalize the pressure in their

2. Physical Therapy Treatment:  Physical therapy procedures included various physical activities and modalities as
needed. The modalities used were electrical stimulation, hot or cold packs, ultrasound, short wave diathermy and
paraffin bath therapy. Each patient's condition was evaluated to determine the appropriate modality, dosage,
placement and methods of application.

Physical therapy techniques were provided and adjusted as the patient's condition warranted. These included
strengthening, range of motion, endurance exercise, neurodevelopmental technique, joint mobilization, kinetic
activities, myofascial release and detailed gait or orthotic training.

Initial evaluation assessed range of motion, strength grades, bed mobility, transfer status, balance, neurological
findings, posture and ambulatory status. Periodic re-evaluations were performed to assess each patient's progress,
and treatment plans were changed as needed. Upon discharge, a discharge evaluation was performed to assess
progress and determine patient's long term therapy program.

The number of therapies varied from 13 to 85 treatments with a mean of 40. Patients came to physical therapy 5
times per week.

3. Bio-Feedback Treatment:  Patients came to biofeedback therapy 5 times per week and recieved a minimum of 21 (
mean 35) one-half hour daily sessions of EEG biofeedback. Sessions consisted of inhibiting and rewarding varous
selected EEG frequencies through audio and visual displays to encourage flexability in brain activity. Each sessioin's
threshold level were automatically calibrated by the instrument ( American Biotech Capscan 80) and a frequency
spectral display summerized EEG amplitudes over 0 to 32 Hertz.

C. Treatment Evaluation.

The effects of treatment were evaluated by a patient's questionnaire and a licensed physical therapist's evaluation
both given at the beginning of the program and again at the end.

In the patient questionnaire, 16 different functions ranging from motor ability and mental situations were analyzed.
Patient's functions were self graded as followings:

- : negative change

0: no improvement at all.

Slight improvement: 1-10 % of the function improved.

Mild improvement: 10- 25% of the function improved.

Moderate improvement: 20-50% of the function improved.

Significant improvement: 50 -75% of the function improved.

Back to normal: 100% of the function improved.

In the physical therapist's evaluation, 33 different functions ranging from motor ability to cognitive functioning were
analyzed. For statistical purposes we assigned the therapist's evaluation of each parameter as either being no
improvement or improvement.

Range of movement: NA stands for "not available" because the patient's function was within normal limits before the
treatment. " No improvement" means the increased range of movement is less than 10 degrees. "Improvement"
stands for when the range of movement increased 10 degrees or more. No matter how much more than 10 degrees of
increased range of motion occurred, all positive results were grouped simply as "improvement".

Extremities strength evaluation: Grading was on a 0-5 degree scale with 0 indicating no strength and 5 indicating
normal as compared to the non-involved extremity. NA stands for "not available" because the patient's function of
that extremity was normal before the treatment. No improvement means the increased strength is less than one
degree, such as from 3- to 3+ was considered as no improvement. Improvement stands for the strength increased at
least one degree, such as from 2 to 3. No matter how much more than one degree of improvement occurred in a
particular patient, all of these patients with positive results were grouped simply as "improvement"

Other functions such as bed mobility, transfer ( supine to sit, sit to stand, bed to chair) balance ( sitting, standing,
ambulatory) were graded as:

#1, independent;
#2, good;
#3, good with care;
#4, with minimal assistance;
#5, with maximal assistance;
#6, unable.

Improvement was defined to occur when the patient's functional evaluation score decreased by at least 1 (#6 being
unable to perform the task and #1 being able to do the task independently)


A: Patient Questionnaire:

Patient questionnaires were collected prior to and after the series of treatments. Patients' general comments for this
program are presented in Table 2.

Table 2:
     Consider this program poor                                                       00.0%

     No improvement (received 22 HBO treatments only)          03.3%

     Consider this program good                                                      30.0%

     Consider this program excellent                                              46.7%

     Consider this program "stupendous"                                     20.0%

Total Patient improvement in at least one of the functions is 96.7%


Only insignificant problems were encountered with the combination of therapies for treating chronic stroke patients.
The summary of the patients' self evaluation is in table 3.


Table 3: Improvement level as evaluated by patients/caretakers.

Function                    %No        %Slight      %Mild        %Mod.    %Significant    %Total Patient Improvement

Arm's motor ability         34.29         0.00       34.29        14.29        17.14                65.72

Arm's Sensitivities         43.48        26.09        4.35        13.04        13.04                56.52

Finger's movement         32.26        32.26        0.00        16.13        19.35                67.74

Leg's motor ability          13.16        13.16       34.21        21.05        18.42                86.84

Walking's manner          13.51         0.00       24.32        35.14        27.03                86.49

Sit down ability              30.00         0.00       13.33        33.33        23.33                70.00

Stand up                         33.33         0.00       10.00        40.00        16.67                66.67

Foot                             53.57        21.43        0.00        14.29        10.71                46.43

Speech                         26.09         4.35       30.43        21.74        17.39                73.91

Memory                        20.83         0.00       29.17        25.00        25.00                79.17

Thinking                        16.67         0.00       20.83        37.50        25.00                83.33

Understanding               13.64         0.00       27.27        31.82        27.27                86.36
Urine control                  31.35         0.00       21.05        21.05        26.32                68.42

Bowel Control                17.65        17.65       11.76        11.76        41.18                82.35
Vision                           47.37         0.00       15.79        10.53        26.32                52.63

Hearing                         46.67         0.00       13.33         6.67        33.33                53.33

B: Physical Therapist's Evaluation:

Physical therapist's evaluations were performed prior to and at the end of the program. 33 different functions including the range of motion, strength and balance function were analyzed. From the paired evaluations, all the patients showed one or more improvements among the 33 functions.

The general findings from the physical therapist's evaluations are in table 4.

Table 4:

Patient % Functional Improvement Levels

10 %       Minimal Gains

08 %       Mild Gains

48 %       Moderate Gains

34 %       Excellent Gains

Total 100%       Showed Improvement

No side effects or problems were encountered with the combination of therapies for treating chronic stroke patients. The result of paired analysis were shown in table 5 and 6.

Table 5: Physical Therapist's Evaluation of Extremities

    Muscle Group                        Improvement in Range of Motion                     Improvement in Strength

  Shoulder                                                NO                YES                                                    NO                      YES           

         Extension                                        00.00                      100.00                                                  34.48                    65.52

         Flexion                                            00.00                      100.00                                                  48.15                    51.85                              

         Abduction                                        18.75                        81.25                                                  48.15                    51.85

         Adduction                                        00.00                      100.00                                                  48.15                    51.85

         Intern.Rotat                                   50.00                        50.00                                                  50.00                    50.00          

         Extern.Rotat                                  42.86                       57.14                                                  50.00                    50.00


         Flexion                                             0.00                        100.00                                                  50.00             50.00

         Extension                                        50.00                         50.00                                                  29.63             70.37   


         Supination                                        33.33                         66.67                                                  55.56               44.44

         Pronation                                        N/A                                   N/A                                               51.85               48.15

         Flexion                                            N/A                                  N/A                                                  40.74             59.26

         Extension                                        28.57                              71.43                                              51.85               48.15


         Flexion                                                  N/A                              N/A                                                  41.38               58.62

         Extension                                            N/A                              N/A                                                  42.86               57.14

         Abduction                                            N/A                              N/A                                                  46.63               53.57

         Adduction                                            N/A                              N/A                                                  29.63               70.37

         Internal Rot                                          N/A                              N/A                                                  50.00               50.00

         External Rot                                  50.00                              50.00                                              53.57               46.43


         Flexion                                           100.00                              00.00                                             62.96                37.04

         Extension                                           0.00                              100.00                                           35.71               64.29


         Plantar Flex                                    83.33                              16.67                                           100.00               42.31

         Dorsiflexion                                    100.00                              00.00                                            55.56               44.44

         Inversion                                                  N/A                              N/A                                             73.08                26.92

         Eversion                                                  N/A                              N/A                                              68.00            32.00

Table 6: Physical Therapist's Evaluation.

          Activity                                                            % No Improvement                              % Improvement
      Bed Mobility

                 Rolling right                                                  20.00                                                            80.00

                 Rolling left                                                    44.44                                                            55.56


                  Supine to Sit                                                  00                                                            100.00

                  Sit to Stand                                                  7.14                                                            92.86

                  Bed to Chair                                                  7.14                                                            92.86


                  Sitting                                                            42.86                                                            57.14

                  Standing                                                      21.05                                                            78.95

                  Ambulatory                                                  30.43                                                            69.57


The results from this study on this new procedure demonstrated that combined of HBO, physical therapy and EEG biofeedback benefit patients suffering from the effects of a chronic stroke. The improvements were similar among patients suffering from cerebral hemorrhage, and cerebral ischemia/thrombosis / embolism. Improvement also occurred in the 3 patients who had suffered from a stroke more than 8 years before beginning our combined therapy program.

Other improvements were also reported by the patients. For example, patients reported that their affected arm and leg felt
chronically cold but changed to warm at some point during the therapy. Fingernails, which had stopped growing for several years, began to grow normally again. The chronic fatigue experienced by the patients prior to their therapy was generally relieved by the program.

The number of treatments required varies for each individual but experience told us that the best results occur when at least 60 daily treatments were done. If only 20 to 30 treatments were done, the patient would often experience "backsliding" and might lose some of the improvement they gained from the hyperbaric oxygen treatments. In addition, some patients would not even begin to improve until they have had more than thirty , forty or even more treatments. The reason for the "backsliding" that could occur with less than 30 treatments has not been studied scientifically but since it occurs at times of stress, it would seem to be due to the effects of excessive corticosteroids and catecholamines produced at these times. Stress hormones have anti-angiogenic properties and accelerate the production of free radicals and lipid peroxidation in blood vessels, all of which will have a detrimental effect on newly growing and fragile capillaries.

In acute stroke situation, as much as 85% of the brain injury are charateristiced as " idling neurons". The newly approved "clot busting" drugs (tPA-tissue plasminogen activator) has been found to be effective in maintaining the viability of the ischemic penumbra if given within the first three hours of the onset of a blood clot type of stroke. Hyperbaric oxygen is being considered as a treatment in conjunction with tPA in the acute stroke setting since it will extend the period of time during which the tPA can be given. (4-6, 10)

When used according to standard protocols, with oxygen pressures not exceeding 3 atmospheres and treatment sessions limited to a maximum of 120 minute, hyperbaric oxygen is safe. ( 15) In this study, there was no side effect was reported.

There were three out of more than 500 patients who have had enough pain and discomfort in clearing their ears and were send to an ear specialist for a simple insertion of a small tube through the ear drum. In these cases, this cured the problem and the person was able to continue with the program without further pain and with no problems with their hearing.

Severe, advanced emphysema may be a contraindication if the person has large lung bullae (large air filled sacks within the lung). The bullae may trap the oxygen and rupture while the person is decompressing. The presence of large bullae can be checked by ordering a CT exam of the chest.

Patients who have had a seizure worry about having another episode while in the chamber. Doctor K.K. Jain (1) the MD
neurosurgeon who wrote the "Textbook of Hyperbaric Medicine" states, "Seizures are extremely rare and no more than a chance occurrence during HBO sessions at pressures between 1.5 and 2 ATA (2 ATA gauge pressure= 14.7 psi=760 mmHg) even in patients with a history of epilepsy." Our experience is similar.

Claustrophobia is an often voiced fear but once the person begins to work with our technicians, he or she is generally able to
overcome their fears without a problem.

Muscle, bone and peripheral nerve dysfunction and atrophy are also major factors that are present in many patients. This is due to inactivity, loss of weight bearing, hormonal deficiencies, mineral deficiencies and a variety of different disease states. These dysfunction's and atrophy require aggressive, daily rehabilitative efforts for a minimum of two months to produce significant, long term beneficial results.

From a practical point of view, the patient who is being considered for hyperbaric oxygen therapy can be tested to determine if he/she is a candidate. A 3-D SPECT scan (single photon computerized tomogram) for determining cerebral blood flow is available at most larger hospitals in the USA. If this test is done and shows focal diminished brain blood flow, the patient has a good chance for significant improvement with a course of hyperbaric oxygen treatments.

This protocol produces the best overall results when the therapy is given in combination with other treatments such as physical, occupational and biofeedback therapy et al. Patient comes to us at average 2 ½ years after their stroke or TBI. They usually have gone through all of the standard therapies and have not improved over the past year despite continuing physical therapy and an active exercise program. They or their family members recognize their lack of improvement and come to us as "the last hope". Due to the severity of their disabilities and their failure to improve with conventional therapies, most patients hope that the use of hyperbaric oxygen will produce gratifying results. However, even with 60 days of hyperbaric oxygen treatments, the results may not reach their expectations, especially if only hyperbaric oxygen is used. Most patient would like to maximize their chances of improving while they are attending our clinic. In view of their desires and the fact that the combination of hyperbaric oxygen and other therapies produces improved overall results, we recommend daily physical, occupational, speech, vision, biofeedback, nutritional, vitamin, hormonal and growth factor therapies as needed to help our patients reach their maximum recovery potential.

In addition to the use of the above mentioned therapies I have also found that many patients have other disease processes which must be treated to maximize their recovery. Many patients when entering our program suffer from chronic urinary tract or other infections, have autoimmune disorders such as vasculitis, suffer from diabetes and diabetic neuropathy, have osteoporosis of the paralyzed limb(s), have serious atherosclerosis or have hormonal deficiencies. All pathologic conditions and problems must be addressed and corrected to maximize the patient's healing.


The chronic stroke and TBI patients, who are stable and have not improved their functioning abilities for months to years, can achieve benefits from the combined administration of HBO, physical therapy and bio-feedback. This therapy program has been demonstrated to have insignificant side effects.


(1) Jain, K.K. : Textbook of Hyperbaric Medicine. 2nd ed. 1996. Hogrefe and Huber Publishers, Inc.

(2) Steenblock, D. "Review of Hyperbaric Oxygen for Stroke Rehabilitation." Explore! Volume 7, Number 5, 1996/97.

(3) Neubauer, R.R., et al. "Hyperbaric Oxygen and Imaging Techniques in Diagnosis and Therapy of Stroke. Does the Ischemic Penumbra alter the outcome in Stroke?" International Symposium: Neuropsychomotor, Neuropharmacological, Psychosocial and Ethical Aspects, Oct. 7-11,1992 Siracusa, Italy. Pp 1-9.

(4) Gottlieb SF, Koehler GL, Rhodes, LVG, "An Oxygen- and pressure-sensitive enzyme: NaK adenosinetriphosphatase. In: CJ Lambertson (ed), "Underwater Physiology V, Proceedings of the 5th Symposium on Underwater Physiology,"
FASEB,Bethseda,1976 pp:431-442.

(5) Gottlieb SF, Schnitt PL. "Effects of increased pCO2 on activity of N-K-ATPase during purification from beef brain
cortex:existence of new controlling mechanism?" Undersea Biomed Res 8:28-29,1981

(6) Schmitt, PL, Gottlieb SF. "Enhancement of cortical Na-K-ATPase by increased Oxygen tensions: Evidence of a new
controlling mechanism." Brain Res. 242:271-278,1982

(7) Limberg M, VanRoyen EA, Hijdra A, et al. "99mm TC-HMPAO washout in prognosis of stroke." Lancet 1 (8642):839, April 15,1989

(8) Neubauer, R. et al . " Enhancing idling neurons." (Letter) Lancet, March 3, 1990, p542

(9) Neubauer, al. " Stroke Treatment." (Letter)The Lancet, June 29,1991 p 1601

(10) Toole, James. American Heart Association. International Meeting on the Cerebral Circulation and Stroke. Anaheim,
CA 1997.

(11) Meye, JS., Obara,K. "Diasschisis." Neurol Res. ( England) 15 (6) p362-6, Dec. 1993

(12) Akashi, K., Takakura, K., Lin, C.Y., Kitamura, K., Takagi, T., "Hyperbaric oxygen therapy; Clinical and basic studies."
Neurologia Medico Chirur., 10: 294, 1968.

(13) Watanabe, M., Kanaya, H., Fuchizawa, K.,Onodera, H., and Suzuki, H., "Experimental study on compressed air therapy on cerebral edema." Jap. J. Hyperbaric Medicine 5: 23, 1970

(14) Micheal H. Sukoff, and Robert E. Ragatz. "Hyperbaric oxygenation for the Treatment of Acute Cerebral Edema."
Neurosurgery 10:29-38, 1982

(15) Patrick M. Tibbles, John S. Edelsberc. "Hyperbaric Therapy." The New England Journal of Medicine 334 (25) 1642, 1996

(16) Akimov, G.A., et al. " Assessment of the effiency of hyperbaric oxygen therapy in early forms of cerebrovascular disorders" Neurosci Behav Phys. 15: 13-16, 1985

(17) Holbach, K.H., et al. "Reversibility of the chronic post-stroke state." Stroke , 7 (3) 296-300, 1976

(18) Holbach, K.H., et al. "Differentiation between reversible and ireversible post-stroke changes in brain tissue: Its relevance for cerebraovascular surgery." Surg. Neurol, 7: 325-331, 1977

(19) Marroni, A., et al. "Hyperbaric oxygen therapy at 1.5 or 2.0 ATA as an adjunct to the rehabilitation of stabilized stroke
patients. A controlled study." Nineth International Congress on Hyperbaric Medicine, Sydney, Australia: March 1-4, 1987, pp. 161-167

(20) Li, W., "Cerebral thrombosis treated by hyperbaric oxygenation." Nineth International Congress on Hyperbaric Medicine, Sydney, Australia, March 1-4, 1987:pp 153-154

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