Our ability to assess local eradication of rectal cancer following radiation therapy remains poor. Conventional imaging and clinical examination techniques are unable to safely predict which patients do not require surgical excision following curative radiation therapy for rectal cancer.

Injections of physiological (2 pglkg) and supraphysiological (8 pgkg) doses of dopamine, norepinephrine, and epinephrine via a cardiac cannula into freshwater-adapted eels were not followed by changes in serum osmolality, sodium, and chloride. Likewise, injections of 8 pgkg of epinephrine had no impact on these parameters in seawater-adapted eels. These results suggest that circulating catecholamines do not have a major effect on the overall balance of osmoregulatory serum components in the intact eel.