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A nurse is preparing to perform a wound irrigation procedure for a patient with a contaminated wound. What solution should the nurse use for wound irrigation?
- A. Sterile water
- B. Normal saline
- C. Hydrogen peroxide
- D. Betadine solution
Correct Answer: B
Rationale: Normal saline is the preferred solution for wound irrigation because it is isotonic and will not damage healthy tissue or delay wound healing. It helps to remove debris and pathogens from the wound, promoting a clean environment for healing. Sterile water can be used if normal saline is not available, but it may cause cellular damage if used in large volumes. Hydrogen peroxide and Betadine solution are not recommended for wound irrigation as they can be cytotoxic to the tissues and interfere with the wound healing process. It's important for the nurse to use evidence-based practice and follow recommended guidelines to promote optimal wound healing outcomes.
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Which of the following mechanisms is responsible for the phenomenon of immunological memory, wherein the immune system mounts a faster and more robust response upon re-exposure to a previously encountered pathogen?
- A. Clonal expansion of memory B cells
- B. Differentiation of na(cid:239)ve T cells into effector T cells
- C. Production of antibodies by plasma cells
- D. Activation of the complement system
Correct Answer: A
Rationale: Immunological memory is primarily maintained by the clonal expansion of memory B cells. Memory B cells are a type of long-lived immune cell that originates from previously activated B cells during an immune response to a pathogen. When the immune system encounters the same pathogen again, memory B cells can quickly recognize and respond to it by undergoing rapid clonal expansion and differentiation into plasma cells that produce specific antibodies. This quick and robust response leads to the more efficient elimination of the pathogen during secondary exposure, resulting in the faster and stronger immune response characteristic of immunological memory.
Which of the following is a common complication of untreated gonorrhea or chlamydia infection in women?
- A. Cervical dysplasia
- B. Ectopic pregnancy
- C. Urinary incontinence
- D. Pelvic organ prolapse
Correct Answer: B
Rationale: Ectopic pregnancy is a common complication of untreated gonorrhea or chlamydia infection in women. This occurs when a fertilized egg implants and grows outside the uterus, typically in one of the fallopian tubes. Both gonorrhea and chlamydia can lead to scarring of the fallopian tubes due to untreated inflammation and infection. This scarring may obstruct the fallopian tubes, making it difficult for the fertilized egg to travel to the uterus for implantation. As a result, the egg may implant and grow in the fallopian tube, leading to an ectopic pregnancy. Ectopic pregnancies are dangerous and can result in serious complications for the woman, including rupture of the fallopian tube, internal bleeding, and potentially life-threatening situations. It is crucial to seek prompt treatment for gonorrhea and chlamydia to prevent such severe outcomes.
Nurse Mauve should plan to initiate which action to provide a safe environment?
- A. Take the patient's vital signs every 4 hours.
- B. Encourage visits from family and friends for psychosocial support.
- C. Maintain fluid and sodium restrictions.
- D. Take off the room lights and draw the window shades.
Correct Answer: D
Rationale: Taking off the room lights and drawing the window shades would provide a calm and soothing environment for the five-year-old patient admitted due to pneumonia with symptoms of cough, respiratory distress, anxiety, and dehydration. By creating a dim and quiet atmosphere, it can help reduce the child's anxiety levels, promote rest and relaxation, and potentially aid in the management of distress caused by pneumonia. Providing a quiet and dark environment can also support the child's comfort and recovery process during the hospital stay.
A patient presents with chest pain that occurs at rest and is relieved by nitroglycerin. An electrocardiogram (ECG) may show transient ST-segment elevation. Which cardiovascular disorder is most likely responsible for these symptoms?
- A. Stable angina
- B. Unstable angina
- C. Acute myocardial infarction
- D. Prinzmetal's angina
Correct Answer: D
Rationale: Prinzmetal's angina, also known as variant angina, is characterized by episodes of chest pain that occur at rest and are relieved by nitroglycerin. Patients with Prinzmetal's angina may also have transient ST-segment elevation on an electrocardiogram (ECG) during episodes of chest pain. This is due to coronary artery vasospasm, which causes temporary obstruction of blood flow to the heart muscle. Stable angina typically presents with chest pain on exertion that resolves with rest, while unstable angina and acute myocardial infarction present with chest pain that is not relieved with nitroglycerin and are associated with more severe coronary artery disease.
A patient presents with fever, malaise, and a skin lesion resembling a "bull's eye" rash at the site of a tick bite. Which of the following is the most likely causative agent?
- A. Plasmodium falciparum
- B. Trypanosoma cruzi
- C. Borrelia burgdorferi
- D. Leishmania donovani
Correct Answer: C
Rationale: The most likely causative agent in this scenario is Borrelia burgdorferi, which is the bacterium responsible for causing Lyme disease. The classic presentation of Lyme disease includes fever, malaise, and a skin lesion resembling a "bull's eye" rash, known as erythema migrans. This rash typically appears at the site of a tick bite. If left untreated, Lyme disease can progress to involve multiple organ systems and lead to more severe complications. Plasmodium falciparum is the causative agent of malaria, which typically presents with symptoms such as fever, chills, and fatigue, but it does not cause a "bull's eye" rash. Trypanosoma cruzi is the parasite responsible for Chagas disease, which presents with symptoms such as fever, swelling at the site of entry (typically the bite wound), and enlarged lymph nodes, but it does not