The P wave represents which of the following? a. Atrial ...

[burchfield96]

The P wave represents which of the following?
 
  a. Atrial contraction
  b. Atrial depolarization
  c. Sinus node discharge
  d. Ventricular contraction

Question 2

A patient has acute kidney injury (previously known as acute tubular necrosis). The following blood work was noted: complete blood count shows a white blood cell count of 11,000 mm3, a hemoglobin of 8 g/dL, and a hematocrit of 30.
 
  His chemistry panel shows serum potassium, 4.5 mg/dL; serum sodium, 135 mg/dL; serum calcium, 8.5 mg/dL; BUN, 20 mg/dL; and creatinine, 1.5 mg/dL. What laboratory value(s) need(s) to be treated most immediately and why?
 
  a. Administration of 5 dextrose in water and insulin because the patient is hyperkalemic and needs this level reduced
  b. Administration of Epogen to treat anemia
  c. Administration of a broad-spectrum antibiotic to treat the elevated blood cell count
  d. Administration of a calcium supplement for low calcium

[billybob123]

Answer to Question 1

B
The P wave is an electrical event and represents atrial depolarization. Atrial contraction should accompany the P wave but does not always. The sinus node discharge is too faint to be recorded on the surface electrocardiogram. Ventricular contraction usually accompanies the QRS complex.

Answer to Question 2

B
A patient showing signs of anemia per his hematocrit and hemoglobin must be treated. Epogen is used because it helps stimulate erythrocyte production by the bone marrow.