A nurse is preparing to administer valproic acid 400 mg PO bid for migraine headaches. Available is valproic acid 250 mg/5 mL. How many mL should the nurse administer per dose?

(Round the answer to the nearest whole number. Use a leading zero if it applies. Do not use a trailing zero.)

The P wave is the first wave on the ECG strip and represents the electrical activity of the atria. It reflects the depolarization of the atrial myocardium, which is the process of changing the electrical charge of the cardiac cells from negative to positive, triggering a contraction. The P wave precedes the QRS complex, which represents ventricular depolarization, and the T wave, which represents ventricular repolarization.

The other options are not correct because:

a. Slow repolarization of ventricular Purkinje fibers. This statement is incorrect because it describes the U wave, which is a small and sometimes invisible wave that follows the T wave on the ECG strip. It reflects the repolarization of the ventricular Purkinje fibers, which are specialized cardiac cells that conduct electrical impulses to the ventricles. The U wave is more prominent in conditions that cause hypokalemia, such as diuretic use or vomiting.

c. Early ventricular repolarization. This statement is incorrect because it describes the ST segment, which is the flat line between the QRS complex and the T wave on the ECG strip. It reflects the early phase of ventricular repolarization, which is the process of restoring the electrical charge of the cardiac cells to negative after a contraction. The ST segment can be elevated or depressed in conditions that cause myocardial ischemia or injury, such as angina or myocardial infarction.

d. Ventricular depolarization. This statement is incorrect because it describes the QRS complex, which is the largest and most visible wave on the ECG strip. It reflects the depolarization of the ventricular myocardium, which triggers a ventricular contraction. The QRS complex follows the P wave and precedes the T wave on the ECG strip.

Aphasia is a language disorder that affects the ability to understand or produce speech. It can be caused by damage to the brain regions that control language, such as from a stroke. Depending on the type and severity of aphasia, the client may have difficulty with comprehension, expression, reading, or writing. Communication strategies for clients with aphasia include using nonverbal cues, such as gestures, facial expressions, pictures, or objects, to supplement verbal messages and enhance understanding.

The other options are not correct because:

a. "Use simple, childlike statements when speaking." This statement is incorrect because it is patronizing and disrespectful to the client. The client's cognitive and intellectual abilities are not affected by aphasia, only their language skills. The nurse should use simple and clear sentences, but not childish or demeaning ones.

c. "Use a higher-pitched tone of voice when speaking." This statement is incorrect because it is unnecessary and may be irritating to the client. The client's hearing is not affected by aphasia, only their language processing. The nurse should use a normal tone of voice and speak slowly and clearly.

d. "Ask multiple choice questions as part of the conversation." This statement is incorrect because it may be confusing and frustrating to the client. The client may have difficulty with verbal output or comprehension, and

multiple choice questions may add to their cognitive load. The nurse should ask yes or no questions or use gestures or pictures to elicit responses from the client.