Factors Contributing To Mean Arterial Pressure

In this video, I go over how I approach hypotension/hypertension considering the factors that contribute to mean arterial pressure. Often times, many of these variables affect overall forward flow, so it’s important to have a methodical approach to blood pressure management.

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  1. Rishi, your video on MAP is very timely as I have been teaching my medics to look at MAP when using the LP15 since that is more accurate than the BP numbers the machine gives. Thanks for the conciseness!

  2. Great, simple video. As a nursing instructor, I often go to the CO equation for them to understand the basics of what you just described; so, I’m pleased I’m on track. I’ve never been clear if pulmonary vascular resistance ties into after load. Seems like it shouldn’t since systole ejects to the systemic system, but that’s the only question that came up for me.

    • No, but it would certainly tie into preload (ie, if the PVR is very high, the right ventricle will have difficulty moving blood into the left side, thereby limiting LV filling).

  3. In regards to monitoring BP/MAP, some coworkers have said if you have an automated cuff and arterial line, the automated cuff is more accurate for MAP and the arterial line is more accurate for SBP/DBP. Thoughts?

    • In general, the automatic cuff is ONLY measuring a MAP directly (via oscillations) whereas an arterial line directly measures a systolic and diastolic blood pressure (and therefore a MAP). By virtue of what they are actually measuring, then yeah, I’m inclined to agree.


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