The Basics of Vasopressors
There is a ton to speak about regarding vasopressors, but before we get to the edge cases, we need to set-up a foundation.
Types of Shock
It's all about flow!
- Should we get rid of blood pressure?
Critical Perfusion Pressures
- CV Collapse 35 mm HG (51 mm Hg in critical AS pts) in one study (Crit Care 2014;18:719)
- MAP of 50 in non-vasculopath dogs for the brain? [cite source='pubmed']9692450[/cite]
- MAP of 65 for the heart? (Dunser et al. think it is 45-50 for the heart)
- MAP 65-75 for the Kidneys? [cite source='pubmed']18382191[/cite]
When we put someone on a vasopressor, what are we hoping to accomplish?
- Critical Perfusion Pressures (Heart will get better, but may look worse)
- Increase Venous Return
- Avoid Gut Ischemia and Flow Reduction
Norepi Increases Venous Return as well as Constricting Afterload
- Crit Care Med. 2012;40(12):3146-3153
- Crit Care Med. 2011 Apr;39(4):689-94
- Crit Care Med. 2013 Jan;41(1):143-50
- Critical Care 2007, 11(Suppl 2):P37
- Critical Care 2010, 14:R142
- Anesthesiology 2014; 120:365–77
- Want to understand the physiology of venous return?
MAP of 65 or Higher?
No benefit to 80-85 group [cite source='pubmed']24635770[/cite]
Vasopressor Flow Chart
Update: The Hinds Perspective
- ‘pressors/catecholamines/inotropes are not so helpful
- Pure Pressors
- Inodilators (another show)
Why Norepi?[cite source='pubmed']10966247[/cite]
Should become weight based
Should tolerate tiny doses
Why Not Dopamine?
'cause it is crappy
Effects on Mortality
Early norepi was better than later norepi [cite source='pubmed']25277635[/cite], [cite source='pubmed']25072761[/cite]
Up and Coming Vasopressors to be Discussed in Future Episodes
Very Good Review Article on the Effects of Vasoactive Agents on Microcirculation
Great Review [cite source='pubmed']20811874[/cite]
Review Articles[cite source='pubmed']12386503[/cite] [cite source='pubmed']21097695[/cite]
Understanding Venous Return[cite source='pubmed']24966066[/cite]
Must Read Posts By Josh Farkas
- Early MAP Stabilization
- Renoresuscitation 12/2014
- Vasopressin & renal function 12/2014
- VANISH trial & vepinephrine 8/2016
Now on to the Podcast…
Latest posts by Scott Weingart (see all)
- EMCrit Podcast 241 – Sepsis Update 2019 - February 21, 2019
- EMCrit Podcast 240 – Renal Compartment Syndrome & It's all about the Venous Side and We've Been Fracking it up for Years - February 10, 2019
- EMCrit 239 – Vent Alarms = Code Blue - January 26, 2019