  The results of $H_\alpha$ and [NII]$\lambda 6583$ observations of the spiral
galaxy NGC 1084 at the SAO 6m telescope with a Fabry-Perot interferometer are
presented. The complex structure of the emission line profile has revealed the
presence of giant star formation regions (``spur'') in the NE part of the
galaxy. In this region the $H_\alpha$ line shows two distinct components, with
line-of-sight velocity differences of $\pm(100-150)\km$.
  The first component corresponds to normal circular rotation. The second
velocity component may be a signature of non-circular motions of the ionized
gas in shock wave fronts. An increase of the ${[NII]}/H_\alpha$ line ratio
confirms the shock wave interpretation of these features. The ionized gas
kinematics in this galaxy is discussed.
