A new-onset myocardial infarction (MI)can be recognized by what electrocardiogram (ECG)change?
A) Q waves
B) Smaller R waves
C) Widened QRS
D) ST segment elevation

Question

Quizplus · Accepted Answer

Any change from baseline is expressed in millimeters and may indicate myocardial ischemia (one small box equals 1 mm).ST segment elevation of 1 to 2 mm is associated with acute myocardial injury,preinfarction,and pericarditis.ST segment depression (decrease from baseline more of 1 to 2 mm)is associated with myocardial ischemia.Widened QRS complexes are indicative of ventricular depolarization abnormalities such as bundle branch blocks and ventricular dysrhythmias.Q waves and smaller R waves are indications usually present 24 hours to 1 week after the myocardial infarction is completely evolved; they represent necrosis.

A New-Onset Myocardial Infarction (MI)can Be Recognized by What Electrocardiogram