Periwinkle Extract and increase blood flow in the brain ... - Abstract
Objectie :To investigate the effect of vinpocetine on cerebral blood flow (CBF) in the compromised circulation of
a stroke affected hemisphere using transcranial Doppler (TCD) and near infrared spectroscopy (NIRS) methods.
Methods : 43 patients with ischemic stroke were randomized into vinpocetine (VP) and placebo group in a double
blind, placebo-controlled study of the effect of a single-dose i.v. infusion of vinpocetine on cerebral blood perfusion
and oxygenation. In the VP group 20 mg VP in 500 ml saline, in the placebo group 500 ml saline alone were
administered. The concentrations of oxy-, reduced- and total hemoglobin were measured by NIRS frontolaterally on
the side of lesion while the mean cerebral blood flow velocity (CBFV), the pulsatility index (PI) and Doppler spectral
intensity (DSI) were monitored by TCD in the middle cerebral artery on the same side. Values were averaged for the
first 5 min prior to the infusion and for the last 5 min of infusion and they were compared between groups. Results :
The concentration of all three chromophores increased during infusion in the VP group (mean dHbT=1.03,
CI95=0.84, P=0.058; mean dHbO=0.92, CI95=0.91, P=0.071; mean dHb=0.10, CI95=0.21, P=0.297). The
HbT and HbO showed a substantially smaller increase in the placebo group (mean dHbT=0.31, CI95=0.74,
P=0.22; mean dHbO=0.57, CI95=0.80, P=0.094) while the Hb decreased (mean dHb=-0.26, CI95=0.29,
P=0.05). Comparing to the placebo group Hb increased significantly in the VP group (P=0.027) while the increase
of HbO and HbT did not reach the level of significance (P=0.29 and 0.11). DSI showed a significantly larger increase
in the VP than in placebo group (dDSI=25.8 CI95=8.8 [VP]; dDSI=3.3, CI95=3.7 [Placebo], P0.005). The
CBFV and PI did not differ significantly between groups. (dVm=5.02.98 cm/s [VP], dVm=4.12.57 cm/s
[Placebo], P=0.28; dPI=0.08 [VP], dPI=0.09 [Placebo]; P=0.47). Conclusion :VP increases cerebral perfusion and
parenchyma ...
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