Doppler transcraniano convencional em voluntários assintomáticos: variabilidade e valores de referência para parâmetros de fluxo sanguíneo

Abstract

RESUMO - Reference values for measures of blood flow velocities and impedance indexes in healthy individuals through conventional transcranial DopplerABSTRACT -Objective: To establish reference values for measures of blood flow velocities and impedance indexes in healthy individuals through conventional transcranial Doppler (TCD) and to observe their variations in relation to the age and sex. Method: 88 asymptomatic volunteers were examined without antecedents of cardiac, peripheral or cerebrovascular diseases. The TCD were accomplished by the same examiner. The middle, anterior and posterior cerebral arteries were studied through the temporal acoustic window and the vertebral and basilar arteries through the suboccipital acoustic window. The values of mean velocity (MV), peak-systolic velocity (PSV), final diastolic velocity (FDV), resistance index (RI) and pulsatility index (PI) of each examined arterial segment were filed. Results: The reference limits found by us were similar to the described by other authors for all of the studied parameters. There was tendency of the flow velocities decrease and of the impedance indexes increase with moving forward of the age. The values of velocities in the women were superior to the found in men. Conclusion: TCD was shown useful in the evaluation of hemodynamic cerebral for our population. Our results are similar to the other studies, so much in the reference values as in relationship with the age and the sex.

Transcranial doppler in sickle cell anaemia: evaluation of brain blood flow parameters in children of Aracaju, Northeast - Brazil

“…This finding differs from a previous study 12 , but in that study participants were adults (predominantly women) without chronic disease. In our data there is not difference in cerebral arteries mV between genders in SCD patients, similarly to previous study in children 8 .…”

B-mode and Doppler ultrasonography in the assessment of the common carotid arteries of equines and mules and the relation with body mass, age and neck circumference

“…On the other hand, in equine females the PI variable showed positive correlations with RI, SV, age and longitudinal and transversal diameter, and negative correlation with DV, that is, a positive correlation was observed between the PI and body mass in mules. As for female equines, that correlation was observed with age, as found by Aguiar (2015) in equines and Barbosa et al (2006) in humans.…”

“…Regarding spectral Doppler parameters, it was observed that the RI variable of mules showed a positive correlation with PI, SV and body mass, and negative correlations with DV and transversal diameter. In equine females there were positive correlations with PI, SV, VFI, age and longitudinal and transversal diameter, and negative correlation with DV, that is, there was a positive correlation between the variable RI with body mass in mules, while in equine females that correlation is with age, as reported by Aguiar (2015) in equines and by Barbosa et al (2006) in humans. A positive correlation was also found between RI and the longitudinal and transversal diameter of the neck in equine females, while in mules this correlation was negative.…”

“…Schmidt-Trucksass et al (1999) observed an indirectly proportional correlation between MV and age in humans, a response identical to that found in mules. However, the association between these variables has been studied and correlated with age (Barbosa et al 2006).…”

Alterações de difusão e perfusão cerebral por RM em angioplastia carotídea com "stent" sob proteção cerebral por filtros

“…A ferramenta do doppler transcraniano pode ajudar a identificar sinais de embolia numa fase não protegida (antes do uso do filtro) ou durante a passagem do filtro ou identificar a embolia no momento da aplicação do "stent" ou do balão ou ainda na remoção do filtro (Angelini et al, 2002;Vos et al, 2005). Também o doppler transcraniano é capaz de fornecer informações sobre fluxo dos vasos do polígono (Barbosa et al, 2006) e demonstrar alterações após angioplastia em segmento cervical (Fregni et al, 2003). Porém a avaliação por doppler tem a desvantagem de avaliar apenas um vaso, geralmente a artéria cerebral média ou a artéria carótida interna cervical distal do lado da estenose carotídea, deixando um vasto território cerebral não coberto na avaliação de fenômenos embólicos.…”