4.2 Core Workflows and Decision Points

Sickle Cell Disease

Sickle cell disease (SCD) is an inherited hemoglobinopathy in which red cells sickle under stress, occluding vessels. The most common acute presentation is the vaso-occlusive crisis (VOC) — severe pain in bones, joints, abdomen, or extremities. The two management pillars are hydration and analgesia, ideally started within 60 minutes of arrival, which lowers admission rates.

VOC workflow: IV fluids to correct dehydration and reduce blood viscosity; scheduled opioid analgesia (morphine or hydromorphone) — pain is undertreated when distractors offer only acetaminophen; supplemental oxygen only if hypoxic; and warmth, never cold, because cold causes vasoconstriction. Avoid restricting fluids and avoid cold compresses — both are classic wrong answers.

Prevention and chronic care:

• Penicillin V prophylaxis begins at age 2 months (125 mg twice daily), increases to 250 mg twice daily at age 3, and continues to at least age 5 to prevent fatal pneumococcal sepsis (these children are functionally asplenic).
• Hydroxyurea is recommended for all children with HbSS starting around 9 months to reduce painful crises and acute chest syndrome.
• Keep up pneumococcal and meningococcal vaccines.

Acute chest syndrome (fever, chest pain, hypoxia, new infiltrate) is a leading cause of death and requires oxygen, antibiotics, analgesia, and sometimes transfusion.

Pediatric Diabetes and DKA

Most children with diabetes have type 1, an autoimmune insulin deficiency. Diabetic ketoacidosis (DKA) is the dangerous decompensation: hyperglycemia, ketosis, metabolic acidosis, dehydration, and the classic Kussmaul respirations with a fruity (acetone) breath odor. Order of management is tightly tested:

1. Fluids first. Give isotonic crystalloid (0.9% saline) 10-20 mL/kg for circulation, then rehydrate slowly over 24-48 hours. The infusion rate should generally not exceed twice maintenance to avoid rapid osmolar shifts.
2. Insulin after 1-2 hours of fluids, as a continuous infusion of 0.05-0.1 unit/kg/hr with NO insulin bolus — bolus and rapid correction raise the risk of cerebral edema.
3. Add potassium once urine output is established, because insulin drives potassium intracellularly and total-body potassium is depleted.
4. Add dextrose to the fluids when glucose falls to about 250-300 mg/dL while continuing insulin to clear ketones.
5. Avoid sodium bicarbonate — it increases the risk of cerebral injury.

Cerebral edema is the most feared complication; risk is higher in children under 3, first presentation, and pH below 7.0. Warning signs are headache, altered consciousness, and bradycardia with hypertension. Day-to-day, children are taught carbohydrate counting and to manage sick days by never stopping basal insulin.

Seizures and Status Epilepticus

During any active seizure the priorities are protect the airway and prevent injury: turn the child to the side (lateral/recovery position) to maintain the airway and prevent aspiration, ease the child to the floor, loosen tight clothing, pad surroundings, time the seizure, and do NOT restrain the child or insert anything into the mouth. Apply oxygen and stay with the child.

A generalized seizure lasting 5 minutes or longer, or repeated seizures without recovery, is status epilepticus — a medical emergency. First-line drug therapy is a benzodiazepine: IV/IM lorazepam, rectal diazepam, or intranasal/buccal midazolam. Lorazepam is often preferred when IV access exists because of its longer anticonvulsant effect. If seizures persist, second-line agents (fosphenytoin, levetiracetam, valproate, or phenobarbital) are added.

Febrile seizures affect 2-5% of children 6-60 months and are usually benign. A simple febrile seizure is generalized, lasts under 15 minutes, and occurs once in 24 hours. Management treats the fever and reassures parents; daily prophylactic anticonvulsants are NOT recommended because medication risks outweigh the benefit. Teach parents seizure first aid and when to call emergency services (seizure over 5 minutes).

Gastroenteritis, Otitis Media, and UTI

Acute gastroenteritis with dehydration is one of the most common pediatric problems. Assess severity by weight loss, capillary refill, mucous membranes, tears, fontanelle, and urine output. For mild-to-moderate dehydration, the treatment of choice (AAP/WHO/ESPGHAN) is oral rehydration solution (ORS): about 50-100 mL/kg over 3-4 hours, given in small frequent amounts (for example, 5 mL every 1-2 minutes) to avoid triggering vomiting; then replace ongoing losses. Plain water, juice, and sports drinks are inappropriate because they lack the correct glucose-sodium ratio.

Reserve IV fluids for severe dehydration, shock, or failed oral therapy. Resume age-appropriate feeding early.

Acute otitis media (AOM) is treated first-line with high-dose amoxicillin (80-90 mg/kg/day); watchful waiting is an option in select older children. Pediatric UTI is treated with a 7-14 day course of an oral agent such as a cephalosporin, amoxicillin-clavulanate, or trimethoprim-sulfamethoxazole guided by culture; a febrile UTI in an infant may warrant imaging.

Tying the Workflows Together

Each of these conditions tests the same decision discipline: read the stem for the cue, identify the priority threat, and choose the intervention that protects the child first. A few cross-cutting rules recur:

• Hydration is therapeutic, not just supportive, in sickle cell crisis (lowers viscosity), DKA (restores circulation), and gastroenteritis (replaces losses) — but the route and rate differ: oral when tolerated, isotonic IV when severe, and never faster than safe osmolar limits in DKA.
• Sequence matters. In DKA, fluids precede insulin; in seizures, airway protection precedes drugs; in VOC, analgesia and fluids are started together within the first hour.
• The dangerous wrong answers are usually the ones that omit a safety step — restricting fluids in sickle cell, bolusing insulin in DKA, restraining a seizing child, or giving low-dose amoxicillin for otitis media.
• Anticipate the feared complication: cerebral edema in DKA, acute chest syndrome and sepsis in sickle cell, status epilepticus in seizures, and shock in severe dehydration.

Mastery means you can state, for any of these conditions, the one priority action, the correct dose or rate where applicable, the complication to monitor for, and the teaching the family needs at discharge. The exam rewards the candidate who thinks in this structured, safety-first order rather than pattern-matching a familiar drug name to a familiar disease.