Cardiovascular Physiology Categorisation Drills for the exam

In this episode we cover categorisation of core cardiovascular topics

Here is a brief summary:

Preload
Rate 
Rhythm
Contractility
Afterload

 Or Shock
Hypovolaemia
Cardiogenic
Distributive
Obstructive

O2 supply demand 

 Supply
= o2 flux or delivery to heart
CBF x o2 content (Hb, sats, PO2)

CVR and CPP
CVResistance = metabolic, myogenic, neural, physical compression, viscosity, pathology
CPP = Cor Pressure – RAP or LVP.

O2 extraction.
High basal extraction of 55-65%
other tissues only 25%
so O2 demand is met by increasing CBF

Demand
Depends on Metabolic rate and myocardial work
Wall tension – PL and AL
Contractility
HR
Rhythms

Wall thickness
Basal rate
Type of work (pressure > volume work)
Electrical activation

When this is unbalanced = ischaemia

Resistance = pressure difference / flow = corPP/ CBF

= 8nl/Pi R4. (n = eta)

Radius
Neural
Physical – compression, HR,
Pathology
Autoregulation

            Metabolic

            Myogenic

 Viscosity

 Coronary blood flow

= CPP/CVR

Neural
Physical
-       Compression
HR
Viscosity
Autoreg
-       Metabolic
-       Myogenic: A myogenic response refers to the intrinsic tendency of vascular smooth muscle to contract in response to increased distending pressure and to relax in response to decreased distending pressure.

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