A patient has a heart rate of 80 beats/min. His stroke volume is ...

[daltonest1984]

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]

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.

[daltonest1984]

Excellent

[scottmt]

TYSM