Sickle Cell Crisis: Pain, Fever and Emergencies

Pediatrics · Hematology (Sickle Cell, Leukemia)·Updated 2026-10-28

What it is

Sickle cell disease is an autosomal recessive disorder in which hemoglobin S polymerizes when deoxygenated, turning red blood cells into rigid sickles. Sickled cells block small vessels (vaso-occlusion), causing ischemic pain and organ infarction, and are destroyed early, causing chronic hemolytic anemia and jaundice. Dehydration, hypoxia, infection, fever, cold, acidosis, stress and high altitude trigger sickling, so care centers on hydration, prompt analgesia, oxygen for hypoxemia and infection prevention. Repeated splenic infarction leaves children functionally asplenic and at risk of overwhelming sepsis.

What the NCLEX focuses on

Vaso-occlusive crisis: severe pain in bones, joints, back, chest or abdomen; in infants, painful swelling of the hands and feet (dactylitis) is often the first sign.
Acute chest syndrome: chest pain, fever, cough, tachypnea, falling SpO2 and a new infiltrate; it is a leading cause of death.
Splenic sequestration: sudden pallor, weakness, an enlarging spleen, tachycardia and falling hemoglobin progressing to hypovolemic shock.
Aplastic crisis: parvovirus B19 (fifth disease) halts red cell production, causing profound anemia with a low reticulocyte count.
Stroke: slurred speech, hemiparesis, seizure or severe headache is an emergency.
Fever of 101.3 F (38.5 C) or higher is an emergency that needs blood cultures and parenteral antibiotics.
Hydroxyurea raises fetal hemoglobin and reduces crises; monitor the CBC for neutropenia.

Priority nursing actions

Assess pain with an age-appropriate scale, give the prescribed IV opioid promptly, then continue on a schedule or by PCA, reassessing every 15 to 30 minutes.
Give prescribed IV and oral fluids while monitoring for fluid overload.
Give oxygen only if SpO2 is below 95%, and encourage incentive spirometry while awake.
Monitor temperature, respiratory status, spleen size and neurologic status for complications.
For fever, obtain cultures and give prescribed antibiotics promptly; give prescribed transfusions for acute chest syndrome, sequestration, aplastic crisis or stroke.

Numbers to know

Value	Threshold or target	Why it matters
Fever	101.3 F (38.5 C) or higher	Functional asplenia allows rapid pneumococcal sepsis
SpO2	Give oxygen if below 95%	Oxygen does not relieve pain when saturation is normal
First analgesic dose	Within 60 minutes of arrival	Vaso-occlusive pain is treated as an emergency
Pain reassessment	Every 15 to 30 minutes until controlled	Guides opioid titration
Penicillin prophylaxis	Twice daily from 2 months of age until 5 years	Prevents pneumococcal sepsis
Transcranial Doppler	Yearly from 2 to 16 years	Abnormal results call for transfusion therapy to prevent stroke
Hydroxyurea	Offered from 9 months of age	Raises fetal hemoglobin and lowers crisis frequency

Common exam traps

Choosing ice packs for painful joints: wrong because cold causes vasoconstriction and more sickling; apply warmth.
Choosing to treat severe pain as exaggerated or drug-seeking and delay opioids: wrong because vaso-occlusive pain is a medical emergency.
Choosing meperidine: wrong because its metabolite, normeperidine, causes seizures.
Choosing oxygen as the main pain treatment when SpO2 is 98%: wrong because it does not reverse sickling in a normally oxygenated client.
Choosing to treat mild scleral yellowing as an emergency: wrong because chronic hemolysis makes mild jaundice an expected finding.

What to teach

Drink extra fluids every day, more in hot weather, illness and exercise; avoid temperature extremes, high altitude and smoke.
Go to the emergency department for fever of 101.3 F (38.5 C) or higher, chest pain, trouble breathing, pallor with an enlarging spleen, or stroke signs.
Give penicillin twice daily until age 5, and keep pneumococcal, meningococcal and yearly influenza vaccines current.
Feel the child's spleen daily as taught and report any enlargement.

Client handout: Sickle Cell Disease: Preventing a Pain Crisis (nurse guide and printable patient handout).

Try 2 NCLEX-style questions on this topic

From the NCLEXPace question bank. Pick your answers, then check them inside NCLEXPace.

Question 1 · QID A0A47140

A 6-year-old with sickle cell anemia is seen in the hematology clinic. For each finding, indicate whether it is expected for this child or requires immediate follow-up.

For each finding, identify whether it is expected or requires immediate follow-up.

	Expected	Requires immediate follow-up
Sudden pallor and profound fatigue 6 days after a classmate was diagnosed with fifth disease
Mild yellowing of the sclerae
Slurred speech and weakness of the right arm that began 1 hour ago
Spleen now palpable 5 cm below the left costal margin with new pallor and a heart rate of 148/min
Takes penicillin V 250 mg by mouth twice daily and hydroxyurea each morning

Question 2 · QID 82B2681E

A client with sickle cell disease reports sudden, severe pain rated 9/10 in the back and legs. Which action should the nurse take?

Select the best answer.

A. Recognize a possible acute painful episode and intervene promptly
B. Interpret the reported 9/10 pain as an exaggerated response to chronic illness and wait for objective signs before escalating treatment
C. Observe the client for another hour to determine whether the severe back and leg pain improves spontaneously before administering treatment
D. Complete the remaining scheduled medications, assessments, and routine care before returning to address the client's severe pain

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More tips on Pediatrics

Type 1 Diabetes in Children: Lows, Sick Days and DKATreat hypoglycemia in children safely, keep basal insulin on sick days, spot cerebral edema in DKA, and match self-care to the child's age.Immunizations: Schedule Principles and ContraindicationsKnow which vaccines are live, the true contraindications versus the false ones, the timing rules, and safe administration and teaching.Growth and Development MilestonesLearn the motor, language and social milestones the NCLEX tests, the red flags that need referral, and the type of play expected at each age.

Sources

Harding MM, Kwong J, Hagler D, Reinisch C. Lewis's Medical-Surgical Nursing: Assessment and Management of Clinical Problems. 12th ed. Elsevier; 2023; Chapter: Hematologic Problems.
Yawn BP, Buchanan GR, Afenyi-Annan AN, et al. Management of Sickle Cell Disease: Summary of the 2014 Evidence-Based Report by Expert Panel Members. JAMA. 2014;312(10):1033-1048.
Brandow AM, Carroll CP, Creary S, et al. American Society of Hematology 2020 Guidelines for Sickle Cell Disease: Management of Acute and Chronic Pain. Blood Adv. 2020;4(12):2656-2701.
Hockenberry MJ, Duffy EA, Gibbs KD. Wong's Nursing Care of Infants and Children. 12th ed. Elsevier; 2024.

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