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- ability of the myocardial muscle tissue to contract and relax after an electrical stimulus
- Contractility
- Anything that increases the strength of contraction of the heart
- Inotrope
- It is the relaxation of the atrium or ventricles also known as the filling stage.
- Diastole
- The volume of blood in the ventricle at the end of diastole. It is dependent on venous return and total blood volume, cardiac output, and length of the diastolic phase of the cardiac cycle.
- Preload
- Due to valvular dysfunction resulting in retrograde or the backwards flow of blood.
- Regurgitation
- The amount of blood pumped by the ventricle with every contraction.
- Stroke Volume
- The contraction of the atrium or ventricles, this propels blood out of the chambers into the pulmonary circulation for the atria and out to the aorta and body for the ventricle.
- Systole
- The force the ventricle must overcome to eject contents, primarily determined by systemic vascular resistance.
- Afterload
- The volume of blood ejected from the heart over 1 minute. Normal range is 4-6 L/min.
- Cardiac Output
- Average blood pressure over the entire cardiac cycle. Goal is 65 mm Hg.
- Mean Arterial Pressure
- Occurs when the heart can no longer produce sufficient cardiac output to meet metaboic demands.
- Heart Failure
- Which valve is most often effected by infective endocarditis is
- aortic