The short period of electrical inactivity between the end of the P wave and the start of the QRS complex is called the:

A patient with known arteriosclerosis was outside doing lawn work when he started experiencing chest pain. Upon your arrival, the patient states that he has been resting and took a prescribed nitroglycerin tablet 5 minutes ago. The patient states that the pain is subsiding. You suspect:

A) unstable angina. B) stable angina. C) Prinzmetal's angina. D) myocardial infarction.

If a patient with myasthenia gravis is given edrophonium, what response would be expected?

a. Diaphragmatic strength will increase for 12 to 24 hours. b. Strength will temporarily improve for 10 minutes. c. Muscle strength will increase for 48 to 72 hours. d. Muscle strength will decrease for 10 minutes.