ATI RN · Obstetrics and Pediatrics · Pediatric Nursing Study Guide

Option D: Smoking marijuana does not increase plasma levels of theophylline and may actually lead to decreased levels due to its effects on cytochrome P450 enzymes, which are involved in theophylline metabolism.

Option A: Cimetidine inhibits cytochrome P450 enzymes, leading to increased plasma levels of theophylline, which can enhance its effects and toxicity.

Option B: Erythromycin is a potent inhibitor of cytochrome P450 3A4, resulting in elevated plasma levels of theophylline, increasing the risk of adverse effects.

Option C: The influenza vaccine does not affect theophylline metabolism and is not associated with increased plasma levels, making it a neutral factor in this context.

Takeaways: Understanding the interactions that can elevate plasma levels of theophylline, such as those caused by cimetidine and erythromycin is crucial for managing potential toxicity in patients on this medication.

Option A: Physical signs of abuse, such as bite marks, may be found in up to 5% of abused children. This statistic highlights the subtlety of physical abuse indicators and the need for vigilance in recognizing signs that may not be immediately apparent.

Option B: A prevalence of 15% overestimates the occurrence of physical signs in abused children, as research indicates a lower percentage.

Option C: A figure of 25% inaccurately suggests a higher incidence of physical signs, which does not align with established data on the prevalence of such indicators in cases of child abuse.

Option D: Claiming that physical signs may be found in 35% of abused children significantly overstates the reality, as the actual percentage is much lower, emphasizing the importance of accurate reporting in child abuse cases.

Takeaways: Understanding that physical signs of abuse, such as bite marks, may be found in up to 5% of cases underscores the necessity for accurate assessment and reporting in child protection efforts.

Option A: fluoxetine is the best initial treatment for children with obsessive-compulsive disorder (OCD) due to its efficacy and safety profile. Selective serotonin reuptake inhibitors (SSRIs) like fluoxetine are first-line pharmacological treatments for pediatric OCD, often combined with cognitive-behavioral therapy (CBT) for optimal outcomes.

Option B: clomipramine, while effective, is a tricyclic antidepressant that is generally not the first choice for children due to its side effect profile and potential for toxicity compared to SSRIs.

Option C: risperidone is an atypical antipsychotic that is not indicated as a first-line treatment for OCD in children and is primarily used for other conditions such as schizophrenia or bipolar disorder.

Option D: anterior capsulotomy is an invasive surgical procedure reserved for severe, treatment-resistant cases of OCD and is not appropriate as an initial treatment for children.

Takeaways: The best initial treatment for children with OCD involves the use of fluoxetine, a selective serotonin reuptake inhibitor, which is preferred due to its safety and effectiveness, especially when combined with cognitive-behavioral therapy for comprehensive management.

Option A: Aplastic anemia is classified as normocytic normochromic anemia due to the bone marrow's failure to produce adequate red blood cells, leading to a normal size and color of the remaining cells. This condition results in a reduction of all blood cell types, including red blood cells, while maintaining their morphology.

Option B: a-Thalassemia typically presents as microcytic anemia due to the reduced production of hemoglobin, which leads to smaller than normal red blood cells.

Option C: Folic acid deficiency anemia is classified as macrocytic anemia because it results in the production of larger than normal red blood cells due to impaired DNA synthesis.

Option D: Iron deficiency anemia is characterized as microcytic anemia, where the red blood cells are smaller and paler due to insufficient iron for hemoglobin production.

Takeaways: Understanding the classification of anemia types is crucial, as normocytic normochromic anemia, such as in aplastic anemia, requires differential diagnosis and management to address underlying causes effectively.

Option D: Hypocalcemia does not commonly cause wheezing in infancy and is not a recognized contributor to respiratory distress in this age group. Wheezing is primarily associated with conditions affecting the airways and lungs, rather than metabolic imbalances like hypocalcemia.

Option A: Bronchiolitis is a leading cause of wheezing in infants, typically caused by viral infections, particularly respiratory syncytial virus (RSV), leading to inflammation and obstruction of the small airways.

Option B: Asthma can present with wheezing in infancy, although it is more commonly diagnosed later. Early wheezing episodes may indicate the potential for asthma development as the child grows.

Option C: Gastroesophageal reflux can lead to wheezing due to aspiration of gastric contents, which irritates the airways and can cause bronchospasm, contributing to wheezing episodes.

Takeaways: Understanding the primary causes of wheezing in infancy, such as bronchiolitis, asthma, and gastroesophageal reflux, is crucial for effective management and prioritizing airway obstruction and ventilation before addressing other potential issues.