If you relax the vasculature you reduce the intra-arterial pressure. This will then cause a reduction in the COP at the alveolar level and the entire system
will essentially be able to hold more. It's more like suddenly opening another checkout at a supermarket than your analogy. There is obviously also an
effect on the systemic circulation and this must be taken into account by monitoring the systemic arterial pressure. Have you tried nitrates in this
setting?
Best wishes,
Rowley Cottingham
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