Nokea
In the electrocardiogram of a 40-year old male, the QRS amplitude in lead I and aVF measured (+) 10 and (-)10mV respectively. The frontal QRS axis is
- A. (+) 15°
- B. (-) 45°
- C. (-) 75°
- D. (-) 90°
Correct Answer: B
Rationale: The frontal QRS axis is (-) 45° given the QRS amplitudes in leads I and aVF.
You may also like to solve these questions
An 18-month-old with a myelomeningocele is undergoing a cardiac catheterization. The mother expresses concern about the use of dye in the procedure. The child does not have any allergies. In addition to an iodine allergy, which other allergy should the nurse bring to the attention of the catheterization staff?
- A. Soy
- B. Latex
- C. Penicillin
- D. Dairy
Correct Answer: B
Rationale: Children with spina bifida (myelomeningocele) are often allergic to latex; catheter balloons and other materials may contain latex.
The enzyme producing carbon monoxide within the human body is
- A. Aminolevulinic acid synthase
- B. Heme oxygenase
- C. Cyclo-oxygense
- D. Nitric oxide synthase
Correct Answer: B
Rationale: Heme oxygenase is responsible for the production of carbon monoxide during the breakdown of heme.
Regarding insulin administration in diabetics:
- A. Short-acting insulin reaches peak action in 4-6 hours after injection
- B. In a twice daily regimen involving Mixtard 30 or Humulin M3, the bedtime reading is an effect of the long-acting component
- C. A bedtime blood sugar level of 10 mmol/l is unacceptable
- D. Using the same site for injections is a common cause of increasing insulin dosage
Correct Answer: B
Rationale: The bedtime reading in a twice-daily regimen involving Mixtard 30 or Humulin M3 is influenced by the long-acting component, which has a prolonged effect.
The parents of a 3-month-old ask why their baby will not have an operation to correct a ventricular septal defect (VSD). The nurse's best response is:
- A. It is always helpful to get a second opinion about any serious condition like this.
- B. Your baby's defect is small and will likely close on its own by 1 year of age.
- C. It is common for physicians to wait until an infant develops respiratory distress before they do the surgery.
- D. With a small defect like this, they wait until the child is 10 years old to do the surgery.
Correct Answer: B
Rationale: Most small VSDs close spontaneously within the first year of life.
Insulin-like growth factor-l (IGF-I):
- A. Increases during pubertal growth spurt
- B. Is a single polypeptide chain
- C. Is produced in pancreas
- D. Is secreted in a pulsatile manner
Correct Answer: A
Rationale: IGF-I levels rise significantly during the pubertal growth spurt, contributing to rapid growth and development.