Which of the following organisms is the most common cause of urinary tract infection (UTI) in children?

Correct Answer: C

Rationale: Escherichia coli (E. coli) is the most common cause of urinary tract infections (UTIs) in children. UTIs in children are most commonly caused by bacteria entering the urinary tract through the urethra. E. coli is a type of bacteria that naturally resides in the intestines but can cause infections when it enters the urinary tract. Children, especially girls, are more prone to UTIs due to shorter urethras that make it easier for bacteria to travel up to the bladder. Therefore, E. coli is the most likely culprit in causing UTIs in children.

Correct Answer: C

Rationale: Partial thromboplastin time (PTT) is the most effective test in diagnosing hemophilia. Hemophilia is a genetic disorder that results in prolonged clotting times due to deficiencies in specific clotting factors, such as factor VIII (hemophilia A) or factor IX (hemophilia B). PTT is a screening test that evaluates the intrinsic pathway of coagulation and helps identify deficiencies in clotting factors. In patients with hemophilia, PTT is typically prolonged due to the reduced activity of the deficient clotting factor. Therefore, measuring PTT can aid in the diagnosis of hemophilia by assessing the clotting function and identifying specific clotting factor deficiencies. Other tests like bleeding time, CBC, and platelet count are important in evaluating overall bleeding tendencies, but they are not as specific for diagnosing hemophilia as the PTT test.

Correct Answer: C

Rationale: Pulmonic stenosis (PS) is a heart condition where there is obstruction or narrowing of the pulmonary valve, which is responsible for allowing blood to flow out of the right ventricle to the lungs for oxygenation. This obstruction leads to decreased blood flow from the right side of the heart to the lungs, causing increased pressure in the right ventricle. This can result in symptoms such as fatigue, shortness of breath, and possible heart murmurs. It is essential for Nurse Alex to educate Jessica's parents about the impact of this obstruction in the right ventricle and the importance of monitoring Jessica's symptoms and seeking appropriate medical care when needed.

Correct Answer: C

Rationale: Epiglottiditis is always considered a medical emergency due to the potential risk of airway obstruction. The epiglottis is a flap of tissue that prevents food and liquids from entering the airway during swallowing. If the epiglottis becomes inflamed or infected, it can swell and block the airway, making it difficult or impossible for the person to breathe. This obstruction can rapidly progress to a life-threatening situation if not treated promptly. Therefore, epiglottiditis requires immediate medical attention to ensure the airway remains open and the individual can breathe properly.

Correct Answer: B

Rationale: Rheumatic fever is an inflammatory condition that can affect different parts of the body, including the joints. The typical physical finding in a child with rheumatic fever is warm and swollen joints, especially in the knees and elbows. This is known as migratory arthritis and is one of the major criteria in the Jones criteria for diagnosing rheumatic fever. Other major criteria include carditis, subcutaneous nodules, erythema marginatum, and Sydenham chorea. So, in a 7-year-old child diagnosed with rheumatic fever, the nurse would expect to assess warm and swollen joints as part of the physical examination.