A patient's heart rate increased from 94 to 164 beats/min. What will the nurse expect as a result?
Decrease in hemoglobin level
Increase in diastolic filling time
Increase in stroke volume
Decrease in cardiac output
The Correct Answer is D
A. An increase in heart rate does not directly affect hemoglobin levels; this option is incorrect.
B. A higher heart rate decreases diastolic filling time, as there is less time for the heart to fill between beats, which can lead to reduced stroke volume.
C. An increased heart rate does not inherently increase stroke volume; in fact, at very high rates, stroke volume can decrease due to reduced filling time.
D. The significant increase in heart rate to 164 beats/min can lead to decreased cardiac output due to compromised diastolic filling and reduced stroke volume.
Free Nursing Test Bank
- Free Pharmacology Quiz 1
- Free Medical-Surgical Quiz 2
- Free Fundamentals Quiz 3
- Free Maternal-Newborn Quiz 4
- Free Anatomy and Physiology Quiz 5
- Free Obstetrics and Pediatrics Quiz 6
- Free Fluid and Electrolytes Quiz 7
- Free Community Health Quiz 8
- Free Promoting Health across the Lifespan Quiz 9
- Free Multidimensional Care Quiz 10
View Related questions
Correct Answer is D
Explanation
A. The superior vena cava is responsible for returning deoxygenated blood from the upper body to the heart and is not directly involved in myocardial ischemia.
B. The carotid artery supplies blood to the brain and is not the primary focus in the context of myocardial infarction.
C. The pulmonary artery carries deoxygenated blood from the heart to the lungs and is not involved in coronary circulation.
D. The coronary arteries supply blood to the heart muscle itself. Ischemia during a myocardial infarction occurs when these arteries are blocked or narrowed, leading to a lack of blood flow and oxygen to the heart tissue.
Correct Answer is C
Explanation
A. While monitoring cardiac output can provide insights into heart function, it does not directly determine the presence of dysrhythmias.
B. Peripheral extremity circulation is influenced by cardiac output but is not the primary focus of monitoring it.
C. Cardiac output is essential for determining the heart's ability to meet the body's oxygenation requirements; low cardiac output can lead to inadequate oxygen delivery.
D. Ventilation status refers to the respiratory function and is not directly assessed through cardiac output measurements.