Which of the following is the most characteristic ...

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Which of the following is the most characteristic electrocardiographi c finding in myocardial in-farction?
 
  a. T wave inversion c. ST segment depres-sion
  b. ST segment eleva-tion d. Down-ward-deflected Q waves

Question 2

What is the heart rate depicted on the following electrocardiogram?
 
  a. 60 c. 100
  b. 80 d. 120

[bhavsar]

Answer to Question 1

ANS: D
When cardiac tissue fed by the left anterior descending and circumflex branches of the left cor-onary artery infarct, Q waves become abnormal most noticeably on the left precordial leads. As a result, the Q waves deflect downward instead of upward because of a lack of counterbalancing electrical forces on the affected side.

Answer to Question 2

ANS: B
Isolating 3 seconds out of the strip shows that there are 4 cardiac cycles in the 3-second period. Multiply 4 by 20. The heart rate is 80 beats/min.

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Gracias!

[rachel]

Thanks for the timely response, appreciate it