EXAM #2: CONGESTIVE HEART FAILURE Flashcards
What is preload?
Tension developed on the wall of the ventricles before the start of contraction
This is equal to the end diastolic volume, and EDV is equal to the atrial pressure
What is the Frank Starling Principle?
More preload = more contractility TO A POINT
What is afterload?
The pressure the ventricle has to push against i.e. arterial pressure/ peripheral vascular resistance
What is the relationship between afterload and contractility?
Increasing afterload increases contractility to a point
This is called the anrep phenomenon
What is the relationship between the contractility and heart rate?
Faster heart rate will be associated with increased contraction
This is called the Bowditch phenomenon*
Draw the relationship between ventricular EDV and stroke volume. How is this changed in HF?
N/A
Generally, in HF you need MORE preload to produce the same amount of WORK.
Draw the pathophysiology of Heart Failure and the major drug action sites.
N/A
What is the main cause of HF?
Cardiac remodeling
What is stage A Heart Failure?
High risk for developing HF
- HTN
- CAD
- DM
- FHX of Cardiomyopathy
What is stage B Heart Failure?
Asymptomatic HF
- S/p MI
- LV systolic dysfunction
- Asymptomatic valvular disease
What is stage C Heart Failure?
Symptomatic HF
- Known structural heart disease
- Dyspnea/ Fatigue
- Reduced exercise tolerance
What is stage D Heart Failure?
Refractory End-Stage HF
- Symptoms at rest despite max. medical therapy
What drugs classes are used to treat Stage A HF?
1) ACEI or ARB
What drugs classes are used to treat Stage B HF?
1) ACEI or ARB
2) Beta-blocker
What drugs classes are used to treat Stage C HF?
1) ACEI or ARB
2) Beta-blocker
3) Diuretics
What drugs classes are used to treat Stage D HF?
1) ACEI or ARB
2) Beta-blocker
3) Diuretics
4) Digoxin
5) Positive ionotrope
What is the effect of diuretics alone on the pathophysiology of HF?
Shift to lower cardiac filling pressure on the same ventricular function curve