Patrick Blanchard said:How low a blood pressure is required to result in acute
renal failure, in your experience?
I don't treat ARF myself. However, I'd expect it to vary by individual.
The kidneys must be adequately perfused, but the pressure required to
accomplish that may depend on many things.
I've always felt that essential hypertension is an automatic
compensation mechanism, not a disorder in itself. By pushing it down
with medication, you only encourage the compensation mechanism to wind
up. There may be a _reason_ why BP has to be high for a specific
individual; the damage done by the high pressure is just an incidental
side effect. Find the reason why the pressure is being maintained at
such a high level, and you can fix it. Push down the pressure
artificially, and a body will just drive it back up, since it is
(presumably) needed for some reason.
If an aircraft in flight springs a leak in an actuator system, that
doesn't mean that you can lower the pressure in the system. Some level
of pressure is required to keep the actuators working, and if you lower
the pressure in order to slow or stop the leak, the actuators won't
work, which defeats your purpose. Same thing for blood pressure. If
you just push BP down blindly because it seems too high, you might just
make things worse.
It's kind of like giving someone lots of water because he has stopped
urinating. Maybe he is just dehydrated, in which case the water will
help. But if he is suffering from kidney failure and you pump him full
o'water because his urine output doesn't match your recommended numbers,
grief will ensue.
There's no such thing as BP that rises for no reason. Essential
hypertension is high blood pressure that is high for an _unknown_
reason, which isn't the same thing; and while pushing it down to a lower
level diminishes the known risks, you have no way of knowing what other
risks may be augmented in consequence.
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