A nurse is assessing a client's vital signs. The oxygen saturation is 85%. What intervention should the nurse perform first?

Choice A reason: Inflammation is not an example of a client's primary defense to infection. Inflammation is a secondary defense to infection, which is activated after the primary defense has been breached. Inflammation is a complex process that involves the release of chemical mediators, the dilation of blood vessels, the increase of blood flow, the migration of white blood cells, and the formation of exudate. Inflammation aims to contain, neutralize, and eliminate the infectious agent and to repair the damaged tissue.

Choice B reason: Fever is not an example of a client's primary defense to infection. Fever is a secondary defense to infection, which is activated after the primary defense has been breached. Fever is an elevation of the body temperature above the normal range, which is usually 36.5 to 37.5 degrees Celsius or 97.7 to 99.5 degrees Fahrenheit. Fever is a systemic response to infection that is regulated by the hypothalamus, which is the part of the brain that controls the body's thermostat. Fever enhances the immune system's activity and inhibits the growth of some pathogens.

Choice C reason: Phagocytosis is not an example of a client's primary defense to infection. Phagocytosis is a secondary defense to infection, which is activated after the primary defense has been breached. Phagocytosis is a process that involves the engulfment and destruction of foreign particles, such as bacteria, by specialized cells, such as macrophages and neutrophils. Phagocytosis is a type of cellular immunity that eliminates the infectious agent and prevents its spread.

Choice D reason: Intact skin is an example of a client's primary defense to infection. Intact skin is the first and most important line of defense against infection, as it forms a physical barrier that prevents the entry of pathogens into the body. Intact skin also has chemical and biological properties that resist infection, such as the acidic pH, the secretion of sebum and sweat, and the presence of normal flora. Intact skin protects the underlying tissues and organs from infection and injury.

Choice A reason: "Because it is easy to digest." is not the best response by the nurse. This is not a valid reason for giving protein supplements to a client with a bed sore. Protein supplements may or may not be easy to digest depending on the type and amount of protein and the client's digestive system. The ease of digestion is not the main goal of protein supplementation.

Choice B reason: "If you don't like it, you don't have to take it." is not the best response by the nurse. This is a dismissive and unprofessional response that does not address the client's question or concern. Protein supplements are prescribed for a reason and the client should be educated on the benefits and risks of taking or refusing them. The nurse should also respect the client's preferences and choices and offer alternatives if possible.

Choice C reason: "These supplements have nothing to do with your wound." is not the best response by the nurse. This is a false and misleading statement that contradicts the evidencebased practice of wound care. Protein supplements have a lot to do with wound healing as they provide the essential nutrients for tissue repair and regeneration. Protein deficiency can impair wound healing and increase the risk of infection and complications.

Choice D reason: "Protein has amino acids that promote wound healing." is the best response by the nurse. This is a factual and informative statement that explains the rationale for giving protein supplements to a client with a bed sore. Protein is composed of amino acids, which are the building blocks of cells and tissues. Amino acids are involved in various processes of wound healing, such as collagen synthesis, angiogenesis, and immune response. Protein supplementation can enhance wound healing and prevent protein malnutrition.