Shared Flashcard Set

Details

a. Blood Pressure
Control
11
Medical
Graduate
11/14/2012

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Cards

Term
What system controls BP on a second to second basis?
Definition
Sympathetic Nervous System (SNS)
Term
Negative feedback mechanism maintains the MAP at...?
Definition
~100mmHg
Term
What is the breakdown of MAP and its individual control/affects?
Definition
MAP=CO x TPR and CO=SV x HR
SV controlled by SNS (affecting contractility, after/preload)
HR controlled by SNS & PNS
TPR= radius, length, and viscosity (a1-receptor) via SNS
Term
Describe the negative feedback loop for BP control
Definition
Stimulus affects baroreceptors/volume receptors, acts on the control center- the Nucleus Tractus Solitarius in Medulla of brain stem-->effectors (heart and vessels)-->response
Term
What ist he control center of BP and where is it located?
Definition
Nucleus Tractus Solitarious (NTS) in the medulla of the brain stem
Term
Where are high blood pressure barocereptors located?
Definition
*Arch of the aorta
*Carotid sinus
-Renal afferent arteriole too
Term
Where are low pressure baroreceptors located?
Definition
-Wall of the right atrium
-SVC/IVC
-Pulmonary artery
Term
What do high and low pressure baroreceptors monitor, respectively?
Definition
High pressure- Cardiac Output (SV x HR)
Low pressure- venous return

*Work together
Term
How can baroreceptors also be activated?
Definition
Palpation- massage

CAROTID MASSAGE- DO NOT MASSAGE THE CAROTID IF PATIENT HAS LOW BP
Term
Nucleus Tractus Solitarius (NTS)- normal output
Definition
-Inhibit vasomotor center
-Stimulate cardio inhibitory center
Term
Describe the RAAS system
Definition
Angiotensinogen-->angiotensin I by Renin
Ang I --> Ang II by ACE
Causes increased BP

ACE inhibitors keep BP low
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