A nurse is interpreting the ECG strip of a client who has bradycardia. Which of the following cardiac components should the nurse identify as the role of the P wave?

Slow repolarization of ventricular Purkinje fibers

Atrial depolarization

Early ventricular repolarization

Ventricular depolarization

Answer and Explanation

The Correct Answer is B

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.

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Correct Answer is ["125"]

Explanation

To calculate the infusion rate, the nurse should use the following formula:

Infusion rate (mL/hr) = Volume (mL) / Time (hr)

Plugging in the given values, the nurse should get:

Infusion rate (mL/hr) = 250 mL / 2 hr

Infusion rate (mL/hr) = 125 mL/hr

The nurse should round the answer to the nearest whole number and use a leading zero if it applies. Therefore, the nurse should set the IV pump to deliver 125 mL/hr.

A. "I'll be glad when I can stop taking this medicine." B. "I have made an appointment to see my dentist next week." C. "I will notify my doctor before taking any other medications." D. "I know that I cannot switch brands of this medication."

Correct Answer is A

Explanation

Phenytoin is an anticonvulsant medication that is used to prevent and treat seizures. It works by stabilizing the electrical activity of the brain and reducing the spread of abnormal impulses. Phenytoin is usually taken for life or until the seizures are controlled by other means, such as surgery or diet. The client should not stop taking phenytoin without consulting their doctor, as this can cause withdrawal symptoms or increase the risk of seizures.

The other options are correct and indicate that the client understands the discharge teaching because:

"I have made an appointment to see my dentist next week." This statement is correct because phenytoin can cause gingival hyperplasia, which is an overgrowth of gum tissue that can lead to bleeding, infection, or difficulty chewing. The client should practice good oral hygiene and see their dentist regularly to prevent or treat this condition.

"I will notify my doctor before taking any other medications." This statement is correct because phenytoin can interact with many other medications, such as antibiotics, anticoagulants, oral contraceptives, or antacids. These interactions can aﬀect the blood levels and eﬀectiveness of phenytoin or the other medications, causing adverse eﬀects or reduced seizure control. The client should inform their doctor of any other medications they are taking or planning to take, including over-the-counter, herbal, or dietary supplements.
"I know that I cannot switch brands of this medication." This statement is correct because diﬀerent brands of phenytoin may have diﬀerent formulations or bioavailability, which can aﬀect the absorption and metabolism of the drug. Switching brands can cause changes in the blood levels and eﬀectiveness of phenytoin, leading to toxicity or reduced seizure control. The client should always use the same brand of phenytoin and check with their pharmacist if they notice any changes in the appearance or labeling of their medication.

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A nurse is interpreting the ECG strip of a client who has bradycardia. Which of the following cardiac components should the nurse identify as the role of the P wave?

Nursing Test Bank

Naxlex Comprehensive Predictor Exams

Correct Answer is ["125"]

Explanation

A nurse is performing discharge teaching for a client who has seizures and a new prescription for phenytoin. Which of the following statements by the client indicates a need for further teaching?

Correct Answer is A

Explanation

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