A new-onset MI can be recognized by which of the following ECG changes?
a. Q waves
b. Smaller R waves
c. Widened QRS
d. ST segment elevation
D
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.
You might also like to view...
Which of the following is the preferred treatment for pain caused by pleurisy?
A) Morphine sulfate B) Meperidine sulfate C) Acetaminophen D) Indomethacin
What assessment finding indicates that a client is a victim of shaken baby syndrome?
1. Fractures of the long bones 2. Retinal hemorrhages 3. Abrasions 4. Burns
An 80-year-old diabetic is to be tested with the fructosamine assay instead of the glycosylated hemoglobin (HbA1c) test because the fructosamine assay:
a. can evaluate level of ketoacidosis. b. is less influenced by age. c. determines the amount of circulating glu-cose. d. is more accurate for type 2 diabetes.
The nurse determines that a patient with heparin-induced thrombocytopenia is at risk for bleeding. Which intervention should the nurse include in this patient's plan of care?
1. Avoid invasive procedures, such as rectal temperatures, urinary catheterizations, and parenteral injections. 2. Apply pressure to puncture sites for 3–5 minutes for arterial blood gases aspiration. 3. Give enemas to help the patient avoid straining during bowel movements. 4. Encourage the patient to brush the teeth thoroughly and rinse with alcohol-based mouthwash after each meal.