Which signs and symptoms are characteristic of pinworms?

Choice A reason: Weight gain is associated with hypothyroidism due to reduced metabolic rate, not levothyroxine overdose. Overdose causes hyperthyroidism-like symptoms, increasing metabolism, leading to weight loss, not gain. In an 8-month-old, excessive levothyroxine accelerates catabolism, making weight gain an incorrect indicator of overdose, as it reflects the underlying untreated condition.

Choice B reason: Vomiting is a sign of levothyroxine overdose, as excess thyroid hormone increases metabolic rate and gastrointestinal motility, irritating the digestive tract. In infants, this hypermetabolic state can cause nausea and emesis, signaling toxicity. Monitoring for vomiting is critical, as it indicates a need to adjust the dose to prevent further complications.

Choice C reason: Irritability in levothyroxine overdose results from excessive thyroid hormone stimulating the central nervous system, causing restlessness and agitation in infants. This hyperthyroid state disrupts normal neurological function, leading to behavioral changes. Recognizing irritability as a toxicity sign is essential for timely dose adjustment to avoid neurological or cardiovascular complications.

Choice D reason: Tachycardia is a hallmark of levothyroxine overdose, as excess thyroid hormone increases catecholamine sensitivity, elevating heart rate. In an 8-month-old, this hypermetabolic state strains the cardiovascular system, risking arrhythmias. Monitoring heart rate is critical, as tachycardia signals toxicity, necessitating immediate dose reduction to prevent cardiac complications.

Choice E reason: Diaphoresis occurs in levothyroxine overdose due to increased metabolic rate and sympathetic activation, causing excessive sweating even in infants. This hyperthyroid state elevates body temperature and energy expenditure, leading to perspiration. Recognizing diaphoresis as a toxicity sign is vital for adjusting levothyroxine to prevent systemic complications like dehydration or hyperthermia.

Choice A reason: Intussusception involves bowel telescoping, causing obstruction. A barium enema is the treatment of choice, as it applies hydrostatic pressure to reduce the invagination, restoring bowel continuity. This non-invasive method is effective in 80-90% of pediatric cases, avoiding surgical risks, and is prioritized unless perforation or peritonitis is present.

Choice B reason: IV fluids support hydration in intussusception but do not address the mechanical obstruction causing bowel ischemia. Fluids manage dehydration from vomiting or reduced intake, but only a barium enema or surgery corrects the telescoping, making fluids a supportive, not primary, treatment for resolving the underlying pathology.

Choice C reason: Immediate surgery is reserved for intussusception cases with perforation, peritonitis, or failed non-operative reduction. While effective, it carries risks like infection or adhesions. A barium enema is preferred as a less invasive option, successfully reducing the intussusception in most children, making surgery a secondary choice unless complications arise.

Choice D reason: Gastric lavage clears stomach contents but is irrelevant for intussusception, which involves intestinal obstruction. It does not reduce the telescoped bowel or relieve ischemia. A barium enema directly addresses the mechanical blockage, making lavage inappropriate, as it fails to correct the underlying anatomical issue causing the condition.