Severe pulmonary HTN where blockade of lung capillaries may acutely exacerbate the condition
Right-to-left shunts, take care with these, but advers effects on coronary or cerebral circulations have rarely been observed
Can easily detect by immediate presence of renal activity best seen on posterior to lateral views and can be confirmed by demonstration of activity in the brain
Shouldn't be injected through a filtered needle or a Swan
If drawing blood into syringe to confirm needle location, should not delay injecting or clots can form and will have clinically insignificant but radiolabeled clots
