what is an RNA (hint it is a diagnostic tool)?
RNA is a type of nuclear cardiology, radionuclide angiography.
a radioactive substance (normally technetium) is injected into the blood by IV and tags RBCs
the tracer releases gamma rays which is tracked by scanners (gamma cameras)
this shows the heart's chambers in motion, see how much blood is pumped out (ejection fraction)
Your doctor can match these recordings with the electrocardiogram (ECG). An ECG is a recording of the heart's electrical activity.
may see a reduced ejection fraction, abnormallities in contraction, etc