Whether drinking it, or having an IV or something. What effects would large amounts of fluid in the body have on the heart or blood?
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If the fluid is large amounts of normal water in a short period of time, then there would be loss of sodium, hypotension, tachycardia and Heart failure. This because the kidneys respond to the increased levels of water by increasing the urinary flow, to do this, sodium is not reabsorved and is eliminated with urine. Since the water has less sodium than required in the blood, the loss of sodium could lead to heart failure.
In a normally functioning person, it has little effect since the excess will be excreted by the intestines, kidneys, lungs and skin. If the heart muscle function was already impaired by heart disease or malfunction when the large fluid volume was consumed, then there could be congestion within the heart as the fluid load backed up within the heart chambers. In this case, fluid would accumulate either in the systemic circulation (indicating right heart weakness), with swelling in tissues throughout the body, or might accumulate in the lungs as pulmonary edema which occurs with left heart pump failure. Pericardial effusion, which involves leakage of fluid into the serosal cavity around the heart, would not be at all likely to occur. In a healthy individual there would be no significant effect.
If the heart collects too much fluid, you might have a pericardial effusion. Liquids would leak into the pericardium and the heart could collapse. Otherwise, nothing would happen to the heart, other then it might increase blood pressure by a little.