At which of these rates can the atrioventricular node initiate a heartbeat?
a. 10 to 20
b. 25 to 35
c. 40 to 60
d. 80 to 100
ANS: C
If the sinoatrial (SA) node becomes nonfunctional, the atrioventricular (AV) node can initiate each heartbeat, but at a slower rate of 40 to 60 beats per minute.
You might also like to view...
Mrs. Silver is currently taking Lasix, 40 mg bid; digoxin, 125 mg qd; and Inderal, 20 mg qd. Which of the following laboratory values would be of concern to you?
a. Digoxin level 1.0 ng/mL b. Potassium level 2.5 mEq/L c. Potassium level 4.0 mEq/L d. Sodium level 140 mEq/L
At the beginning of rounds when entering the room, what should the nurse do first?
a. Check the intravenous (IV) infusion site for swelling or redness. b. Check the infusion pump settings for accuracy. c. Make eye contact with the patient, and introduce him or herself as the patient's nurse. d. Offer the patient something to drink.
After assessing a patient, a nurse documents the state of awareness as confused. What part of the brain controls awareness?
A) cranial nerves C) hypothalamus B) reticular activating system D) medulla
During a home visit, the nurse learns that a patient has not been taking the prescribed medications. The patient reports having no insurance and tells the nurse that the drug is too expensive
After learning that there is no substitute medication, the nurse will perform which action next? a. Assist the patient to apply for a patient-assist program. b. Contact the pharmacy to request a reduction in the cost of the drug. c. Determine the patient's annual income. d. Give the patient the number of a charitable organization that may be able to help.