Hemodynamics - EXAM 4 Flashcards
What is the pathway of blood flow through the heart?
- Inferior Vena Cava, Superior Vena go into the
- Right atrium to the
- Tricuspid Valve to the
- Right Ventricle out the
- Pulmonary semilunar valve into the
- Pulmonary arteries to the
- Lungs and then out of the
- Pulmonary veins into the
- Left atrium and through the
- Mitral (bicuspid valve) into the
- Left ventricle and then through the
- Aortic valve into the
- Aorta and then through the
- Arteries and then the
- Capillaries and meets up with the
- Veins and all venous blood dumps into the
- Inferior vena cava, superior vena cava
What is blood pressure?
Pressure in the systemic arteries which is created by the ejection of blood from the left ventricle.
What factors affect BP?
Cardiac output and systemic vascular resistance
What is the Mean Arterial Pressure (MAP)?
Reflects the average or mean arterial pressure in the blood perfusing the organs. Changes in MAP are related to the dynamic relationship between cardiac output and systemic vascular resistance
What does a low MAP indicate?
Decreased blood flow through the organs
What does a high MAP indicate?
Increased cardaic workload
What is the MAP needed to adequately perfuse and sustain vital organs of an average person?
60 mm Hg
roughly equal to a systolic blood pressure of 90 mm Hg
What is starling’s law?
The greater the stretch of the ventricular muscle fiber, the greater the contraction, to a point.
What is preload?
Preload occurs during diastole. The term refers to the volume of blood filling the ventricles prior to the beginning of systole. Preload is regulated by the variability in intravascular volume and the volume of blood returning to the ventricle.
WRONG. THIS IS WRONG
What is afterload?
Afterload describes the resistance that the heart has to overcome, during every beat, to send blood forward into the aorta. These resistive forces include vasoactivity (blood vessel diameter and rigidity) and blood viscosity
WRONGGGGGGGGGg. This is WRONG. THESE TEACHERS ARE SO STUPID
What is contractility?
Describes the strength of cardiac muscle contraction
What is cardiac output?
The volume of blood pumped by the heart in one minute
HR X SV = CO
What is stroke volume (SV)?
The amount of blood pumped by the heart per cardiac cycle. It is measured in mL/beat.
What are positive Inotropes?
Any medication or circumstances that increases the force of cardiac contraction
What are negative Inotropes
Any medication or cicumstances that decrease the force of cardiac contraction
What is hemodynamic monitoring?
The measurment of pressure, flow, and oxygenation within the cardiovascular system. Values commonly obtained VIA an invasive catheter include central venous pressure, pulmonary artery pressure, pulmonary atery wedge pressure, cardiac output, and stroke volume.
What is pulmonary vascular resistance (PVR)?
The measure of resistance of the pulmonary vascular bed to blood flow
What is systemic vascular resistance?
The measurement of resistance of the systemic vascular bed to blood flow
What is left ventricular ejection fraction?
Also referred to as ejection fraction. This is the percent of blood ejected from the left ventricle during one cardiac cycle. The average EF is 55-65%.
What is central venous pressure (CVP)?
CVP readings are used to assess right ventricular function and general fluid status using an invasive hemodynamic catheter