Intensive care trainee, with acute medicine background. POCUS n00b, fair-weather golfer. Bookmark more articles than I read
Nov 23, 2021 • 13 tweets • 6 min read
Doc 1: There’s a big swing on their A-line, shall I give more fluids?
Doc 2: Well given that they’re spontaneously breathing, there’s no real evidence to support PPV here 🤷♂️
- A recently overheard conversation, prompting this 🧵 on PPV in the spontaneously breathing patient.
The ∆ between systolic & diastolic pressures is the pulse pressure (PP) & it is determined by the compliance of the aorta and the ventricular stroke volume (SV).
Whilst aortic compliance reduces with age, beat-to-beat changes in PP occur predominately due to changes in SV.