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Cardiac Mechanics, Cardiac Cycle, and Heart Sounds
Cardiac Mechanics, Cardiac Cycle, and Heart Sounds by Dr. Gibbons
47
Medical
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10/08/2011

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Term
stroke volume / end-diastolic volume =
Definition
ejection fraction
Term
decreasing afterload had what effect on cardiac output
Definition
increase stroke volume and cardiac output
Term
serves to direct flow in one direction and keep blood in the ventricles as pressure is developed to the point where it exceeds the pressure downstream
Definition
valves
Term
othe period of filling on the PV loop
Definition
phase I
Term
the period of isovolumic contraction of the PV loop
Definition
Phase II
Term
the period of ejection on the PV loop
Definition
Phase III
Term
the period of isovolumi relaxation
Definition
Phase IV
Term
at the end of ventricular filling and right before isovlumeric contraction what valve closes
Definition
the mitral valve
Term
when the pressure in the left ventricle almost reaches the pressure in the aorta
Definition
the aortic valve opens
Term
when the pressure in the aorta is higher than the pressure in the left ventricle the
Definition
aortic valve closes
Term
an increase in preload leads to
Definition
an inrease in stroke volume but not end systolic volume
Term
the normal LV will adjust its stroke volume according to its
Definition
diastolic filling volume
Term
what can ause increased ventricular systolic pressure that leads to higher left ventricle end systolic volume and reduced stroke volume
Definition
increased afterload

examples hypertension and aortic stenosis
Term
what can ause increased ventricular systolic pressure that leads to higher left ventricle end systolic volume and reduced stroke volume
Definition
increased afterload

examples hypertension and aortic stenosis
Term
the relationship between afterload and end-systolic volume is
Definition
linear (called the end-systolic pressure volume relation or ESPVR
Term
end systolic volume relies and 2 things
Definition
afterload and contractility of the ventricle NOT preload
Term
reduced ventricular filling
Definition
diastasis
Term
isovolumic contraction, rapid ventricular ejection, and reduced ventricular ejection are all a part of
Definition
systole
Term
isovolumic relaxation, rapid ventricular filling, reduced ventricular filling, and atrial systole are all parts of
Definition
diastole
Term
the closing of the mitral and tricuspid valves creates
Definition
the first heart sound (S1)
Term
the closing of the aortic and pulmonic valves creates the
Definition
second heart sound (S2)
Term
Systole occurs druing
Definition
S1 and S2
Term
diastole occurs during
Definition
S2 and S1
Term
What type of valvular heart disease can cause a systolic murmur and predispose to fainting spells during exercise?
Definition
aortic stenosis
Term
senile degeneration, congenital deformity, rheumatic heart disease are all causes of
Definition
aortic stenosis
Term
what must be increases to overcome resistance of small valve opening and drive blood flow
Definition
left ventricular pressure
Term
when a large systolic pressure gradient (more than 100 mmHg is creaated between the LV and the aorta the person has
Definition
aortic stenosis
Term
LV hypertrophy leading to decreased compliance and LA hypertrophy are major long term effects of
Definition
aortic stenosis
Term
CHF, angina, and syncope during exercise are major consequences of
Definition
aortic stenosis
Term
imbalance of oxygen supply and demand
Definition
angina
Term
diminish S2 and ejection systolic murmur are abnormal heart sounds associated with
Definition
aortic stenosis
Term
What type of valvular heart disease can cause a diastolic murmur and predispose to fatigue and difficulty breathing during exercise?
Definition
mitral stenosis
Term
a condition mainly due to acute rheumatic fever and is associated with increase pressure gradient between the LA and the LV
Definition
mitral stenosis
Term
a state that leads to increased pulmonary venous and capillary pressure that leads to CHF and dyspnea and hemoptysis
Definition
increased LA pressure and volume due to mitral stenosis
Term
a condition associated with decreased LV filling that leads to decreased LV enddiastolic volume and decreased stroke volume and cardiac output
Definition
mitral stenosis
Term
pulmonary hypertension that causes an overload in the RA and stretch of the conductive fibers that may be cause atrial fibrillation are consequences of
Definition
mitral stenosis
Term
an opening snap that follows S2 and a diastolic murmur are abnormal heart sound associated with
Definition
mitral stenosis
Term
this condition can be caused fromFrom diseases of aortic leaflets (e.g. rheumatic)
or dilatation of the aortic roots (e.g. aneurysm
Definition
aortic regurgitation
Term
this condition results in abnormal amount of blood regurgitate from the aorta to the LV during diastole which causes increase stroke volume acording to Frank Starling
Definition
aortic regurgitation
Term
this condiotion results in normal sized LV that leads to increases LV diastolic pressure and increased LA pressure that can cause dyspnea and pulmonary edema
Definition
Acute aortic regurgitation
Term
early diastolic murmur is the abnormal heart sound associated with
Definition
aortic regurgitation
Term
left ventricle dialtion causing eccentric hypertrophy due to the increased LV volume and pressure. ALso high systolic arterial pressure due to hig stroke volume and reduced aortic diastolic pressure results in a widened pulse pressure eventually leading to heart failure is associated with
Definition
chronic aortic regurgitation
Term
the abnormal heart sound associated with mitral regurgitation is a
Definition
holosystolic murmur
Term
increased LA size and compliance that results in normal LA pressure and normal pulmonary venous pressure and low CO and fatigue
Definition
chronic mitral regurgitation
Term
a condition associated with high LA pressure that leads to pulmonary congestion and edema
Definition
acute mitral regurgitation
Term
a condition that is caused due to structural abnormalities due to ischemic heart disease , infectionand results in abnormal amount of blood regurgitate to the LA
Definition
mitral regurgitation
Term
the following are effects of what condition:
increaased LA volume and pressure
2. reduced LV cardiac output
3. overloaded LV during diastole
Definition
mitral regurgitation
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