Cardiovascular NCLEX Exam 2: With Verified Answers 2024

Cardiovascular NCLEX Exam 2: With Verified Answers 2024 Coronary artery perfusion is dependent upon: A. Diastolic pressure B. Systolic pressure C. Afterload D. Systemic vascular resistance - Correct Answer A. Diastolic pressure Diastolic pressure in the aortic root is higher than left ventricular end diastolic pressure (LVEDP) (the pressure exerted on the ventricular muscle at the end of diastole when the ventricle is full). This enables blood to flow from a higher pressure through open arteries to a lower pressure. This pressure gradient is known as coronary artery perfusion pressure. As diastolic pressure drops, there is a decrease in coronary artery blood flow. Mixed venous oxygen saturation (SvO2) assesses: A. Preload B. Afterload C. Oxygen delivery D. Oxygen consumption - Correct Answer D. Oxygen consumption Mixed venous oxygen is measured in the pulmonary artery and measures the oxygen saturation of blood that has passed through the entire circulatory system. Therefore, it is measuring the oxygen that has been consumed by the tissues. Normal mixed venous oxygen saturations are: A. 30-40% B. 20-45% C. 80-100%