What is the mechanism of action for antimigraine agents?
a. Blocking parasympathetic nerve impulses
b. Increasing cerebral blood flow
c. Constricting dilated cerebral arteries
d. Exerting a sympathomimetic effect
ANS: C
Adrenergic-blocking agents dilate the veins in smooth-muscle tissue in the peripheral vascular system and the uterus. This reduces cerebral blood flow and arterial pulsing, which reduces the headache pain.
You might also like to view...
Why is it most appropriate to compute a chi-square (2) when comparing frequency of gender (male/female) and smoking status (smoker/nonsmoker)?
1. Gender and smoking status are both nominal level variables in this example and a chi-square requires nominal level data. 2. Gender and smoking status, as defined in this case, are both ordinal level data and a chi-square requires ordinal level data. 3. Chi-square is used in any research question where the independent variable is grouped according to gender. 4. An ANOVA is the most commonly used test with nominal/nominal level data.
Biofeedback, psychotherapy, and hypnosis are examples of adjunctive therapy in addition to traditional medical treatment that have been shown to have a positive effect on the course of psoriasis
Indicate whether the statement is true or false
What finding would the nurse expect to assess in a patient in the prodromal phase of hepatitis?
A) Decreased PT B) Decreased liver transaminases C) Elevated serum bilirubin D) Decreased INR
Which is true about newborns classified as small for gestational age (SGA)?
a. They weigh less than 2500 g. b. They are born before 38 weeks of gestation. c. Placental malfunction is the only recognized cause of this condition. d. They are below the 10th percentile on gestational growth charts.