[Auditory requirement for group 2 vehicle driving licences. An update in accordance with valid legislation in Spain]. / Requerimiento auditivo en licencias de conducción de vehículos del Grupo 2. Actualización conforme a la legislación vigente en España.

INTRODUCTION: Hearing loss level admitted for acquisition of Group 2 driving licences is actually 35%, but this measurement is not standarized. METHODS: In 35 drivers with Group 2 licence bearing of hearing loss, it was measured in the usual way -considering threshold as an average-, and also in accordance with valid legislation, which considers deafness when hearing thresholds are under 25 dB in each tone. RESULTS: Binaural hearing loss average was 41.3+/-6.3% for the first model, and 30.7+/-10.2% for the second. There was a good correlation between the two models by mean of lineal regression (y=1.4785x-30.382; R2=0.8467). CONCLUSIONS: In Group 2 licences, hearing loss average must be standarized in its quantifyng technique, because there is a wide difference in the results, depending on the model used to measure. In our country there are rules and regulations about quantifying for disable people, valid for establishing deafness measurement patterns in vehicle driving too.

[Blood viscosity modifications in patients with presbycusis]. / Alteraciones en la viscosidad sanguínea en pacientes con presbiacusia.

OBJECTIVE: [corrected] To evaluate the existence of blood viscosity alterations in presbyacusis as an eventual pathophysiological mechanism. MATERIAL AND METHODS: Nine 75 year-old subjects bearing of bilateral slowly progressive sensorineural deafness were considered to be studied on a yearly basis in a ten year folow-up period, evaluating the binaural hearing loss in speech tones (500, 1000, 2000 and 3000 Hz). Hemorheological profile on peripheral blood included total blood viscosity (BV) at different shear rates (SR), blood filterability (BF), erythrocyte deformability and aggregability (EA). RESULTS: There was a trend of all parameters towards hyperviscosity, with an increase at ten years of BV at high SR and EA at total stasis which were statistically significant. The level of deafness correlated significativelly to low values of BF and increases on BV at high SR. CONCLUSIONS: Presbyacustic patients do show hemorheological evidences that suggest a tendency towards hyperviscosity as a predisposing factor for hearing loss.