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In heart failure the body already holds too much fluid. Why do the kidneys keep holding on to more?
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Heart failure
Why the heart fails
The heart is two pumps side by side. The right ventricle sends blood through the lungs; the left ventricle, with the thickest wall in the heart, drives it through the aorta to the rest of the body
Heart failure means the heart can no longer pump enough blood for what the body needs, or can do so only at the cost of raised pressures inside it. It is not one disease but the end point of many: heart attacks, years of high blood pressure, faulty valves and diseases of the heart muscle itself can all lead there. Most often it is the left ventricle that fails
It can fail in two ways. In the first, the muscle contracts weakly, usually because a heart attack has killed part of it, and each beat empties too little of the ventricle. In the second, the muscle contracts well but has grown thick and stiff, most often after years of high blood pressure, and cannot relax enough to fill. Doctors tell the two apart by the ejection fraction, the share of the blood in the ventricle that each beat pushes out: 40% or less in the first kind, 50% or more in the second
How the body answers
Either way, the heart pumps less blood each minute. This cardiac output is the heart rate times the stroke volume, the blood pushed out by one beat: at rest about 70 beats of 70 mL each, roughly 5 litres a minute. When it falls, the body cannot tell a weak pump from a loss of blood, and it answers the way it would answer bleeding:
What a falling output sets off
- 1
Output falls
Each beat pushes out less blood, and blood pressure starts to drop
- 2
Sensors raise the alarm
Pressure sensors in the arteries and the kidneys register less flow
- 3
Nerves push the heart
The sympathetic system speeds the heart and tightens the arteries
- 4
The kidneys hold water
Renin–angiotensin–aldosterone makes them keep salt and water
- 5
Volume rises
More blood fills the heart, which helps at first and later floods the lungs and legs
In the short term this keeps blood pressure up and the organs supplied. In the long term it makes things worse. A heart driven faster tires sooner, tightened arteries make it pump against more resistance, and the extra salt and water back up behind the weak ventricle. Fluid that leaks into the lungs is pulmonary edema, felt as breathlessness when lying flat; fluid that collects in the legs shows as swelling around the ankles
This is why so many of the drugs used in heart failure work by blocking the body’s own answer rather than by strengthening the heart: ACE inhibitors and aldosterone antagonists quiet the kidneys’ signal, beta blockers slow the heart, and diuretics remove the extra fluid
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Fill the gap
Low kidney blood flow renin–angiotensin–aldosterone
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ScenarioTry 1 of 2
Mrs. Okafor’s heart rate
Your patient, Mrs. Okafor, 72, has heart failure after a heart attack: her ejection fraction is 30%. Her ankles are no longer swollen, but her heart still beats 105 times a minute at rest. You want to start a beta blocker, and her son objects: her heart is weak already, so why slow it down?
Do you start it? Pick one, then tell me why, step by step
Yes, start itNo, it would lower her outputOnly if she gets breathless
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Nila Cards
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An ordinary card
Which chamber of the heart has the thickest wall?
The left ventricle
A Nila card
Why does the left ventricle have the thickest wall in the heart?
It drives blood through the aorta to the whole body. The right ventricle only sends it through the lungs
Review the topic, not just the facts
Some things you simply have to remember, and Nila asks those too. But most cards put a fact back in its place: steps in order, two things side by side, a quiz that asks why. So you review the topic as a whole, not a pile of separate facts
1 / 8
Trace blood through the heart's own circulation
- 1
Aortic sinuses
The coronary arteries open just above the aortic valve
- 2
- 3
Cardiac veins
Collect it from the heart muscle
- 4
Coronary sinus
Drains it into the right atrium
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Nila Atlas
Everything you learn, in one Atlas
What sets experts apart isn’t how many facts they know. It’s how those facts fit together in their head. The Atlas builds that for you. Every lecture you study joins one map, across all your courses. Where two topics meet, Nila draws a dotted line and asks how they connect. Answer it, and the line turns solid
Week 1
One idea. Connected everywhere
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