Laser research: Tinnitus, abstract and studies
Most research was done by Dr. Lutz Wilden, Germany, please refer to: www.dr-wilden.de
Comprehensive Laser Rehabilitation Therapy of Tinnitus: Long-Term Double Blind Study in a Group of 200 Patients in 3 Years M. Prochazka, M.D., Private Rehab Clinic "Jarov", Prague, CZ Ass. prof. A. Hahn, ENT Clinic, FNKV Faculty Hospital, Prague, CZ Abstract Definition of tinnitus records that it is an auditory perception for which there is no objective sonic source from the outer environment. Our original study, published in Laser Partner Clinixperience No. 4/2000, has been regarded as a classical tinnitus work. It unambiguously confirmed clinical experience of our predecessors, presented with a high amount of personal enthusiasm (Shiomi, Wilden) but, unfortunately, not much based on statistics. However, recently our study has gained corroboration by originally slightly sceptical medical authorities obtaining statistically almost identical results. Our study has been published more than two years ago. With the time passing by we have been under the impression that the results might be even better than those obtained during several-months therapy in the original cohort of patients. This impression led to a decission that a new comparison with a larger group of patients, than the original forty in our basic study, and followed in a longer time horizon, might be of a certain interest. We were wondering whether our clinical observations, confirmed by personal experience of other clinics, would also find an adequate correlate in statistical expression. Introduction For our New Study the patients registered in our clinic due to tinnitus for more than three years were chosen. With regard to maximum objectiveness, the patients who had finished attendance due to unknown reasons were included in the "no-effect" group, although we are well aware that a part of them finished the treatment because of various other reasons (such as time cunsuming engagements, problematic transport, family reasons). In a small group of 5 patients we tried to check the objective reasons by a phone query, and indeed, 2 patients gave other reasons whilst 3 patients had finished attendance due to unsatisfactory or no result of procedures. Even though it is interesting for us to have another little group of 6 patients visiting our clinic for check ups and for a series of therapies despite (after a year and more) zero effect of procedures. In a part of this group (in 3 patients) a certain subjective improvement (up to less than 50 per cent relief) can be noticed after a long attendance (2 - 3 years). There is certainly a point at issue, to what an extent this subjective improvement can be regarded as an objective one, whether these patients have not settled down to their complaint... It is a problem of little numbers, definitely not having any influence over the total figure, however, from a clinical point of view we consider this observation interesting... It should be also mentioned that, in general, compliance of patients suffering from tinnitus is excellent, which may be caused by the level of their subjective tribulations leading to a craving to get rid of it. Materials and Methods We have evaluated in total 200 patients visiting our clinic since 1997 till now for tinnitus, followed till 2001, i.e. at least for 3 years. With our approval 8 patients, who were totally free of tinnitus after a short period of treatment, were crossed off and finished attendance earlier. In this respect we have an odd case history of a female patient, who was relieved of her several years lasting lateralized tinnitus after a single mobilization of distal C vertebra (note that entire 8.8 per cent of patients in our original study were relieved of tinnitus only by mere physiotherapy procedures aimed at axial skeleton - there really exists an often disputed diagnosis of vertebrally conditioned tinnitus). As it can be seen above, patients, who finished the therapy due to reasons unknown, have been incorporated in the group "therapy with no effect". Evaluated group of patients was chosen at random from the whole number of our patients with tinnitus, the main condition being particularly regular attendance during the period of the last three and more years. In all the patients a subjective tinnitus had been diagnosed, i.e. an organic cause of this condition could not be straightly determined by examinations (meaning that especially patients with dg. neurinomus statoacusticus or another organic cause, such as a tumor or a head injury with a positive finding by NMR, CT or EEG, were excluded). In this respect we are well aware that some dubitation could be seen in possible atherosclerotic changes of veins, especially of carotid veins and a. vertebrales, which might also be regarded as an organic cause of tinnitus. However, with almost a hundred-per-cent level of incidence in population of higher age categories it is rather difficult to call these changes a pathology.
Average age was 64 years, ranging within the limits of 15 and 98 years. This meant a shift towards higer categories of age, probably corresponding with the incidence of tinnitus within the population, and maybe also due to the fact that our activities have been covered by media, mainly by those focussed on seniors, and thus new patients could have appeared on the basis of media influence. Level of subjective complaints was evaluated according to, nowadays almost classical, three scales:
In order to simplify the effect of therapy as much as possible the results were divided in four groups:
Therapy 1. Medication: Although we consecrate primarily to evaluation of a comprehensive rehab therapy, obviously our patients are simultaneously medicated, too. We never leave medication out, for in our complement of rehabilitative care there is no need to be affraid of possible interactions between medicamentous and non- medicamentous therapies. Furthermore, with the most freq uently prescribed medicaments - preparations based on Gingko bilobae extracts - also a possible potenciation of effects of LLLT by these preparations is often discussed. Our patients have mainly been medicated with Gingko preparations, the all-round effects of which on stimulation of CNS as well as their positive influence on blood reologic characteristics can be considered unambiguously proven. Clinical practitioners will definitely appreciate minimum side effects (within our group only one case of insomnia and one case of dermatitis). Gingko bilobae preparations (Egb 761 extract) were taken by 146 patients, i.e. 73 per cent. Another medicament - Betahistidine - was taken by 78 patients, i.e. 39 per cent. We do not even oppose combination of both the preparations - 32 patients (16 per cent). 27 patients took other vasoactive medication (Cinarizine, Enelbine, Geratam). 11 patients had no medication targeted on tinnitus, mainly due to another basic diagnosis, the medication of which could be considered contraindicated for above mentioned preparations.
2. Manipulation: Another part of the therapy, though simultaneous, was a goal-directed rehabilitative manipulation of axial skeleton, particularly of distal etages of neck vertebra. Our classical paper has proven a frequent and statistically important concurrence of incidence of tinnitus with a functional or organic pathology of distal segments of C vertebra, especially C5/C6 parts. Classical physiotherapy procedures, such as electrotherapy or other antalgic physical procedures, as well as instructions for therapeutic physical exercise in terms of directed relaxation of distal neck and trapezius etc., are focussed on this part of aetiology of tinnitus. We have also found useful traction therapy, in terms of tractions with the possibility of modulated mode to intermitent intensity of traction momentum in the horizontal (Eltrac by Nonius). Device techniques are chosen strictly individually, same applies to forms of physical exercise, based on diagnostic-therapeutic consideration of a rehab specialist. Physical exercise was prescribed to 100 per cent of patients, device techniques were applied on 186 patients (contraindications in 14 patients). We have noticed in two cases of DD currents (antalgic myorelaxation physiotherapy) an unwanted side effect - a dermatitis in the areas of contact of electrodes, probably due to a touch of nickel in the electrodes. It is important to mention a positive psychological effect of procedures aimed at the axial skeleton from the point of view of the patient`s evaluation of our therapeutical activities. Even patients with no final effect of therapy on tinnitus percieve positively the effect on affection of pain of axial skeleton, and this always appears to a certain extent, with regard to the category of age of our patients... 3. LLLT - Physiotherapy aimed at the initial organ of hearing: There is no need to discuss necessary parameters of laser probes used. We need an infrared laser beam with a sufficient power output (we have been using an IR 300 mW laser probe, we also tried using a 450 mW probe but a part of our patients reported a subjectively unpleasant thermic effect in the area of application). On the other hand, we pay maximum attention to irradiation of a sufficient dosage of energy. In our clinic we use the following techniques of LLLT application:
We strictly appeal to maintain the direction of the vector of aiming the beam - in fact the target structure of the helix is a shape of several square milimeters. It might be the reason why, when compared with other laser devices with the same output parameters, therapy with Maestro/CCM probes has proved rather successful due to their characteristic diffusion of the emitted beam, increasing probability of hitting desired target structures (difference of prognostic level of success between hitting the target with a shotgun or with a rifle - thanks to ass. prof. Horak for his witty comparison). LLLT has been applied on 100 per cent of our patients. Attendance was scheduled so that the first series of 8 - 10 procedures in total, twice a week, be a complex consisting of medication, rehabilitation therapy of axial skeleton, and LLLT. In the interval of 2 - 3 months further courses of therapy follow, usually consisting of 5 - 6 therapies, once a week, always as a series of LLLT procedures. Therapy of axial skeleton is added when necessary (often not necessary in case of regularly exercising patients, instructed properly in the course of the first series). Medication with Egb 761 continuing in the long term, most of the patients after several months of therapy with a reduced dosage 1 - 0 - 1 tablets, in the order of at least several more months. A part of the patients in the cycle between procedures has noticed a possibility to titrate medication according to immediate subjective complaints - it means they keep to regular dosage 1 - 0 - 0, when tinnitus accelerates switching to 1 - 1 - 0, or even to 1 - 1 - 1 tablets. Possible episodes of accelerated tinnitus usually abate quickly then. In case of long term stabilized patients we plan clinical check ups at least twice a year, always connected with mobilisation of acute blockades of distal C vertebra. Inviting patients for these check ups always in the spring and fall has proved successful. We have noticed one rather substantial phenomenon of LLLT: so far no side effect has been reported. On the other hand, there is an interesting clinical finding in a certain group of patients (6 patients = 3 per cent), an acceleration of tinnitus after the first few LLLT procedures. Positive aspect of this phenomenon is that these patients have always belonged in the group with a massive effect of the therapy (more than 50 per cent relief, or even free of tinnitus at all). This clinical observation has been personally confirmed by other authors working at tinnitus treatment with the use of LLLT (Wilden). Placebo LLLT Due to persistently appearing theories on the effect of LLLT of tinnitus being a mere placebo we have created a minor group of 31 patients in order to confirm or exclude this hypothesis. In the course of three months attendance these patients underwent medication therapy as well as physiotherapy of axial skeleton with classical rehabilitation techniques in the same extent as all the other patients did. Instead of a functional laser source these patients were treated with a probe not emitting laser beam, although there was acoustic as well as visual signalization of operation. Among all other physiotherapeutic devices a non-invasive laser is extremely suitable to perform a placebo test, since its application on a patient is not connected with any subjective feelings nor phenomenons (in contradiction to electrotherapy, for instance). As we work with an IR wavelength, it was possible to arrange a double blind study, for the fact whether the therapist works with a device emitting laser beam or with a placebo unit was not even known to the therapeutic personnel. The results - unambiguously confirming that there is no placebo involved in LLLT - are summarized in Table 2. The outcome is undoubtedly statistically significant.
Statistical comparison Courtesy: Mr. Arnost Komarek, Biostatistisch Centrum, Katholieke Universiteit Leuven, Belgium. Statistical comparison of the two groups, differing from each other by the length of therapy was done with the use of ? 2 test of homogenity of two multinomic separations, confirming whether distribution of monitored population into groups according to the effect of therapy is equal for both groups, i.e. after 6 months and 3 years of therapy. Expressed in mathematical terms, let us suppose that the effect of therapy in both studied populations (6 months vs. 3 years) is directed by multinomic division, i.e. that a given person belongs with a certain probability (based on population) to one of the four groups according to the effect of therapy. It will be statistically tested whether the probability of participation in individual groups is equal in both populations. We can pronounce an alternative hypothesis, that the probability to belong at least to one group according to the therapy is different in populations studied. For the calculation of testing statistics it is necessary to calculate expected frequencies, i.e. frequencies which could be monitored under a hypothesis that the length of therapy has no influence on the effect. Higher differences between relative and expected frequency testify against the hypothesis of zero influence of the length of therapy.
The ? 2 test statistics, which is in the case of zero hypothesis directed by ? 2 division with 3 grades of loose in the first group is : ? 2 = 0.88. Monitored p value equals 0.83, which is rather a high level and thus it can be stated that the difference between the two groups with different duration of therapy is not statistically significant. Discussion
After three years of clinical monitoring 200 patients after Comprehensive Laser Therapy (medication, rehab physiotherapy aimed at axial skeleton and LLLT) of tinnitus have been evaluated with the following results:
Literature and references
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