The video clip on the left was obtained in the cardiac cath lab as
the left coronary angiogram was recorded in the LAO/cranial projection.
The movie clip demonstrate both a "video" representation (coronary
angios, as they appear on playback in the cath lab) and the "cine"
or cineangiographic equivalent as seen on the developed film. The
two views correspond to the negative and positive prints of photography
film. You can toggle back and forth between the two views by clicking
on the respective button. You can also click a button to see a labeled
freeze frame of the coronary angiogram.
In the LAO-Cranial view, the LAD begins
close to the spine and then moves away from it and towards the left
ventricular apex. The diagonal (Dx) moves medially
away from the LAD. The septal perforators (SP) are smaller branches
that come off the inferior border of the LAD (at nearly a right-angle)
and travel downwards and to your left. The Dx coronary artery comes
off the LAD and moves diagonally downwards and to your right.
The Cx, in the RAO-cranial view, moves away from the LAD and towards
the spine before giving off its branches that curve downwards and inferiorly
running roughly parallel to the LAD.
In the Left Anterior
Oblique or LAO view, the Image Intensifier(II)/camera assembly is rotated
along a vertical axis towards the patient's left and head-wards (or cranially),
as shown on the left (above). The picture on the left (above) shows
the view of the heart as seen by the II in this projection. Once again,
the size of the heart has been purposely exaggerated for
purposes of illustration. Please remember that the ventricular septum
lies in a plane between the right shoulder and the left nipple. Thus,
in the LAO view, the camera "looks down the barrel" of the left ventricle
with the septum lying anterior and away from the spine (running in the
plane between the left scapula and the right nipple). Since the left
anterior descending runs in the anterior inter-ventricular groove, the
LAD swings away from the spine.