The dysrhythmia in which P waves cannot be identified because of rapid multiple electrical signals that fire from areas of the atria other than the SA node is known as ________.
A. PVCs
B. ventricular tachycardia
C. bundle branch block
D. atrial fibrillation
E. ventricular fibrillation
Answer: D
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The human body is in the most stable equilibrium when
a. sitting because the center of gravity in the largest body mass is midway to the ground and the base of support is balanced between the two sides. b. standing because the center of gravity in each body part is closest midline and the base of support is under the major body masses. c. side-lying because the center of gravity in each body mass is closer to the ground and the base of support is broader. d. lying supine because the center of gravity in each body part is closest to the ground and the base of support is broadest.
Which parts of the eye are highly sensitive to light and function best in dim light but do not provide a sharp image and detect only black, white, and shades of gray?
A. Conjunctivas B. Rods C. Ciliary bodies D. Cones E. Retinas
Which serious immediate complication of peripheral vascular surgery requires an immediate return to the OR?
a. Pain b. Hypertension c. Thrombus d. Hypotension
The recommended dose of Lanoxin is 0.25–1.0 mg IV. At doses in excess of 1.5 mg, Lanoxin becomes toxic. A drug's margin of safety—the range between an effective dose and a lethal dose—is known as the:
A) physiologic dosing regimen. B) drug toxicity level. C) therapeutic index. D) none of the above