Chapter 10 Pt 1 - Kailey Flashcards
What is the #1 cause of death in the U.S
Heart Disease
What is the most common mechanism of heart disease
contractile (pump) failure
- Heart not pumping enough blood to supply the body
What is the most common cause of Heart Failure
Decreased cardiac output
- can also be caused by an increase in tissue demands
What causes decreased cardiac output
Systolic dysfunction, diastolic dysfunction and valvular dysfunction
Systolic dysfunction is when the heart will not relax which means it won’t fill enough
False, this is Diastolic Dysfunction
Systolic Dysfunction - is when there is weak contraction
Would pericardial tamponade cause diastolic or systolic dysfunction
Diastolic Dysfunction - it compresses the heart not allowing it to relax completely
______ occurs when the heart cannot generate sufficient output to meet the metabolic demands of the tissues
Congestive Heart Failure
Forward Failure (Insufficient output) is almost never combined with Backward Failure (Venous Congestion)
False, almost always combined
What is the adaptation in which the heart tissues will stretch in response to and increase in end diastolic volumes in order to increase contraction strength
Frank-Starling Mechanism
In the Frank-Starling Mechanism when in the patient said to be in “compensated heart failure”
When the dilated ventricle is able to maintain cardiac output
- this increases the oxygen demand of the heart muscles which it cannot keep up for a long time and will eventually lead to failure
What effect does norepinephrine have on heart rate
Increases HR,contractility and BP
What effect does the Renin-Angiotesin-Aldosterone System have on the heart
It initiates salt and water retention which increases vascular tone
What effect does ANP have on circulation
Vasodilation
Overload on the heart causes Cardiac Hyperplasia
False, Hypertrophy
Concentric Hypertrophy occurs when the ventricular wall thickness increases without an increase in size of the chamber
True
- Concentric is the bad kind - the walls grow in filling the ventricle
- this is a pathologic response
Eccentric Hypertrophy occurs when there is proportional dilation of the heart and a decrease in capillary denisity
False, Proportional dilation of heart and INCREASE in capillary density
- Cross section of ventricle remains the same
- this is a Physiologic Response