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 C

Explanation

Obtaining a pair of slipper socks for the client is a simple and safe way to provide warmth and insulation to the feet, which can improve blood ﬂow and comfort.

Placing a moist heating pad under the client's feet is not recommended, as it can cause burns, vasodilation, or increased ﬂuid loss, which can worsen the condition.

Increasing the client's oral ﬂuid intake is not relevant, as it does not aﬀect the temperature or circulation of the feet.

Rubbing the client's feet briskly for several minutes is not advisable, as it can cause trauma, inﬂammation, or ulceration to the fragile skin and tissues of the feet.

Obtaining a pair of slipper socks for the client is a simple and safe way to provide warmth and insulation to the feet, which can improve blood ﬂow and comfort.

Placing a moist heating pad under the client's feet is not recommended, as it can cause burns, vasodilation, or increased ﬂuid loss, which can worsen the condition.

Increasing the client's oral ﬂuid intake is not relevant, as it does not aﬀect the temperature or circulation of the feet.

Rubbing the client's feet briskly for several minutes is not advisable, as it can cause trauma, inﬂammation, or ulceration to the fragile skin and tissues of the feet.

A. Delayed B. Immediate C. Immune complex-mediated D. Cytotoxic

Correct Answer is D

Explanation

Cytotoxic hypersensitivity is a type of hypersensitivity that involves the production of IgG or IgM antibodies that bind to antigens on the surface of cells, leading to cell destruction by complement activation or antibody-dependent cellular cytotoxicity. Myasthenia gravis is an example of a cytotoxic hypersensitivity, as it is caused by autoantibodies that target the acetylcholine receptors on the muscle cells, impairing neuromuscular transmission and causing muscle weakness.

Delayed hypersensitivity is a type of hypersensitivity that involves the activation of T cells and macrophages, leading to inﬂammation and tissue damage after several hours or days of exposure to an antigen. Examples of delayed hypersensitivity include contact dermatitis, tuberculin skin test, and transplant rejection.

Immediate hypersensitivity is a type of hypersensitivity that involves the production of IgE antibodies that bind to mast cells or basophils, leading to degranulation and release of histamine and other mediators, causing anaphylaxis, urticaria, or allergic rhinitis within minutes of exposure to an antigen.

Immune complex-mediated hypersensitivity is a type of hypersensitivity that involves the formation of antigen- antibody complexes that deposit in tissues or blood vessels, leading to complement activation and inﬂammation, causing vasculitis, glomerulonephritis, or serum sickness within hours or days of exposure to an antigen.

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