Heart Failure Exacerbation

A Clogged Pump Backing Up Water

Imagine a water pump trying to push 5 liters per minute through a house's pipes, but the pump is cracked and weak—it only squeezes out 3 liters. The pipes downstream (your body's arteries) start to starve for water, so your house's emergency system (the sympathetic nervous system and RAAS) panics and tells the kidneys (think: a valve at the intake) to jam more water into the system to compensate. Now 7 liters are trying to enter a pump that can only handle moving 3 liters forward. The backup pressure climbs and climbs until water (fluid) leaks backward through the check valve (the mitral valve) into the attic cistern (the left atrium and lungs). Your lungs fill with water instead of air, and you gasp. The harder the emergency system pushes, the worse the backup gets—a vicious cycle. Without turning off the panic response (giving diuretics and beta-blockers), the whole system drowns.