Lidocaine is an antidysrhythmic that works by:
A) antagonizing beta-adrenergic receptors in the myocardium.
B) blocking sodium channels in the Purkinje fibers and ventricle.
C) displacing calcium at certain receptor sites in the myocardium.
D) increasing the duration of phases 1, 2, and 3 of the cardiac cycle.
Answer: B) blocking sodium channels in the Purkinje fibers and ventricle.
You might also like to view...
Your patient is undergoing peritoneal dialysis. After several fluid exchanges, you notice that the patient's abdomen is distended and blood pressure is elevated. So far, 6500 cc have been infused and 5500 cc have been drained
Which of the following actions would be most appropriate? A) Obtain an order for antibiotics B) Turn the patient from side to side C) Lower the head of the bed D) Insert a nasogastric tube
The nurse on a urology unit is working with a patient who has been diagnosed with oxalate renal calculi. When planning this patient's health education, what nutritional guidelines should the nurse provide?
A) Restrict protein intake as ordered. B) Increase intake of potassium-rich foods. C) Follow a low-calcium diet. D) Encourage intake of food containing oxalates.
An older woman has urgent urinary incontinence related to an overactive bladder. Which medication does the nurse expect the provider to order?
a. Dimethylsulfoxide (DMSO) b. Flavoxate (Urispas) c. Phenazopyridine HCl (Pyridium) d. Tolterodine tartrate (Detrol)
According to OSHA, which of the following activities is related to back injuries in nursing centers?
a. Moving a person who is calm and able to assist b. Repositioning a person in a bed or chair with someone assisting c. Bending to bathe a person or to change linens d. Using a mechanical lift following the manufacturer's instructions