A nurse in a provider's office is assessing a client who reports dyspnea and fatigue. Physical assessment reveals tachycardia and weak peripheral pulses. The nurse should recognize these findings as manifestations of which of the following conditions?

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.

Turn the client's head to the side.

The nurse should turn the client's head to the side first to prevent aspiration of oral secretions and maintain a patent airway. This is the priority action according to the airway, breathing, and circulation (ABC) principle.

Check the client's motor strength is wrong because it is not the priority action and it is not feasible during a seizure. The nurse should check the client's motor strength after the seizure to assess for any neurological deficits or postictal weakness.

Document the time the seizure began is wrong because it is not the priority action and it can be done later. The nurse should document the time, duration, type, and characteristics of the seizure, but only after ensuring the client's safety and well-being.

Loosen the clothing around the client's waist is wrong because it is not the priority action and it may not be necessary. The nurse should loosen any tight clothing that could impair breathing or circulation, but only after securing the airway and protecting the head from injury.

Turn the client's head to the side.

The nurse should turn the client's head to the side first to prevent aspiration of oral secretions and maintain a patent airway. This is the priority action according to the airway, breathing, and circulation (ABC) principle.

Check the client's motor strength is wrong because it is not the priority action and it is not feasible during a seizure. The nurse should check the client's motor strength after the seizure to assess for any neurological deficits or postictal weakness.

Document the time the seizure began is wrong because it is not the priority action and it can be done later. The nurse should document the time, duration, type, and characteristics of the seizure, but only after ensuring the client's safety and well-being.

Loosen the clothing around the client's waist is wrong because it is not the priority action and it may not be necessary. The nurse should loosen any tight clothing that could impair breathing or circulation, but only after securing the airway and protecting the head from injury.