Author Question: A patient has a heart rate of 80 beats/min. His stroke volume is 70 mL/beat. Is his cardiac output ... (Read 116 times)

daltonest1984 · **on:** Jun 25, 2018

A patient has a heart rate of 80 beats/min. His stroke volume is 70 mL/beat. Is his cardiac output normal, decreased, or increased?

What will be an ideal response?

Question 2

Which of the following ECG changes is one of the earliest to occur during an ST-elevation infarction, but may have resolved by the time the patient seeks medical assistance?

a. Pathologic Q waves
b. Hyperacute T waves
c. Horizontal ST-segments
d. Lengthening of the QT interval

Heffejeff · **Reply #1 on:** Jun 25, 2018

Answer to Question 1

Output is normal.
Stroke volume = 70 mL/beat
Heart rate = 80 beats/minute
SV HR = CO
70 mL/beat 80 beats/min = 5600 mL/min = 5.6 L/min
Cardiac output = normal (normal is between 4 and 8 L/min)

Answer to Question 2

B
Hyperacute (i.e., tall) T waves are sometimes called tombstone T waves and typically measure more than 50 of the preceding R wave. In addition to an increase in height, the T wave becomes more symmetric and may become pointed. These changes are often not recorded on the ECG because they have typically resolved by the time the patient seeks medical assistance.