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Author Question: A patient has a heart rate of 80 beats/min. His stroke volume is 70 mL/beat. Is his cardiac output ... (Read 223 times)

daltonest1984

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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


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Heffejeff

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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.


daltonest1984

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Reply 2 on: Jun 25, 2018
Gracias!

CAPTAINAMERICA

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Reply 3 on: Yesterday
Excellent

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