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WorksheetsPre test CVS physiology
Total questions: 10
Worksheet time: 10mins
The primary determinants of myocardial O2 consumption, from most to least
important, are
Preload > afterload > heart rate
Heart rate > preload > afterload
Afterload > preload > heart rate
Heart rate > afterload > preload
The MAP in a patient with a blood pressure of 180/60 mm Hg is
90 mm Hg
100 mm Hg
110 mm Hg
120 mm Hg
In a normal person, what percentage of the cardiac output is dependent on the “atrial kick”?
25%
35%
45%
55%
Normal resting myocardial O2 consumption is
2.0 mL/100 g/min
3.5 mL/100 g/min
8 mL/100 g/min
15 mL/100 g/min
Normal resting coronary artery blood flow is
10 mL/100 g/min
40 mL/100 g/min
75 mL/100 g/min
120 mL/100 g/min
The graph below represents
Diastolic time (as percentage of cardiac cycle) as a function of
heart rate
Stroke volume as a function of end-diastolic pressure
Cardiac index as a function of end-diastolic pressure
Cardiac output as a function of ventricular end-diastolic volume
Which of the following terms refers to myocardial relaxation or diastole ?
Inotropy
Chronotropy
Dromotropy
Lusitropy
Regarding the cardiac cycle, which of the following is FALSE?
Left ventricle (LV) systole has three phases.
Isovolumic contraction occurs after mitral valve closure.
The decrease in ejection fraction (EF) is proportional to the decrease in LV function.
Isovolumic contraction occurs in both the LV and right ventricle (RV).
Which statement regarding coronary blood supply is FALSE?
The left anterior descending, left circumflex, and right coronary arteries supply blood to the LV.
Most coronary blood flow to the LV myocardium occurs during systole.
A “right dominant” coronary circulation occurs when the right coronary artery supplies blood to the posterior descending
coronary artery and is observed in approximately 80% of patients.
Right atrial (RA), LA, and RV coronary perfusion occurs during both systole and diastole.
The heart normally extracts between 75% and 80% of arterial O2content, by far the greatest O2 extraction of all the body's organs. In regards to O2
demand and consumption by the heart, all of the following statements are true EXCEPT:
Cardiac O2
extraction dramatically increases to near maximal during exercise.
The primary mechanism by which myocardium meets its O2demand through enhanced O2
delivery.
Coronary blood flow and myocardial O2
consumption increase four- to fivefold during strenuous physical exercise.
Heart rate is the primary determinant of myocardial O2
demand in the intact heart.
