Perhaps it's a kind of short hand for coronaro-ventriculography
see the reference.
http://www.ncbi.nlm.nih.gov/pubmed/44135[Principles of analysis and the value of coronaro-ventriculography in coronary surgery]

[Article in French]

Amiel M.
The examination which precedes any operation for revascularisation of the myocardium, coronaro-ventriculography, which has become a routine examination in specialised centres, should gain even further in reliability by anatomical examination of the vessels which it is used to study in vitro. A perfect knowledge of the distribution of the vessels (the numerous and sometimes unrecognised variations are a source of diagnostic error) and of the characteristics of the lesions (atheromatous in most cases) is essential for the accurate interpretation of a coronary arteriogram. Difficulties in analysis of the latter are numerous and the physician interpreting the examination should be fully aware of them before any decision regarding surgery is taken. Ventriculography routinely analyses, zone by zone, the contours of the left ventricle. In certain cases this segment study is associated with overall analysis of ventricular volumes and stroke fraction.

Previously called angioplasty. This involves passing a catheter into a diseased vessel and expanding a balloon at the end of the catheter which widens the blood vessel. A stent is then inserted which keeps the blood vessel open.
An angioplasty is a type of treatment. An angiogram, by contrast, is purely a diagnostic procedure which allows one to look at the heart vessels and arrive at the diagnosis.
Very often, nowadays, the surgeon will agree with the patient that he will perform an angiogram (i.e. an investigation) and if he finds a blockage he will then proceed to percutaneous coronary intervention - so it is essentially the investigation and treatment in one. This is often called a coronary catheterisation procedure which can be either just looking at the heart or repairing a blockage depending on what is found.