latent, dormant, quiescent, potential mean not now showing signs of activity or existence. latent applies to a power or quality that has not yet come forth but may emerge and develop. dormant suggests the inactivity of something (as a feeling or power) as though sleeping.
However, H1N1 can progress quickly, so it is uncertain if knowing the patient had influenza would have prevented their rapid progression. Vasopressors can cause tissue ischemia if used in high doses, and I have seen necrosis of digits due to vasopressors. That being said, I have never seen limb amputations due to vasopressor use, but it could happen.
Atrial natriuretic peptide (ANP), a hormone secreted by the atria of the heart, lowers blood pressure by causing vasodilation and by stimulating the kidneys to excrete more water and Na +(lowering blood pressure by reducing blood volume). Nitric oxide (NO), secreted by endothelial cells, causes vasodilation.