Compare conditions

Put any two — or three — conditions side by side, adult or pediatric, to spot the look-alike differences fast, row by row.

Sickle Cell Crisis

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In one line

·When oxygen drops, hemoglobin S (the sickle version of the oxygen-carrying protein) turns stiff and sharp, bending red blood cells into a crescent or sickle shape.

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Normal physiology

·Red blood cells are soft, round, donut-shaped bags filled with hemoglobin, the protein that picks up oxygen in the lungs and carries it to every tissue in the body. Because red cells are soft and bendable, they can squeeze through capillaries (the tiniest blood vessels, narrower than a human hair) to deliver oxygen even to hard-to-reach spots. Once hemoglobin drops off its oxygen, the red cell travels back to the lungs to reload and start the trip again. A healthy red cell lives about 120 days, making thousands of round trips before it wears out and the spleen quietly pulls it out of circulation.

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What goes wrong

·In sickle cell disease, a person inherits two copies of the hemoglobin S gene (one from each parent), so nearly all their hemoglobin is the S type instead of the normal adult type (hemoglobin A). Hemoglobin S works fine when it is holding oxygen, but the moment it releases oxygen—especially if oxygen levels drop, the blood becomes acidic, the person is dehydrated, an infection is brewing, the body is cold, or stress hormones are high—the hemoglobin S molecules stick together and form long, stiff rods inside the red cell. Those rods poke the soft, round cell into a hard, crescent or sickle shape. Sickled cells are stiff, sticky, and fragile: they pile up and block the smallest blood vessels, they break apart (hemolyze) much faster than normal (living only 10 to 20 days instead of 120), and they also switch on the lining of blood vessels (the endothelium), which calls in white blood cells and makes the vessels even stickier and more inflamed. The result is a vicious cycle: blockage cuts off oxygen, low oxygen triggers more sickling, and more sickling causes more blockage and more cell death.

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Hallmark signs

·Severe pain in bones, especially in the back, chest, arms, or legs
·Fever (temperature above 100.4°F or 38°C)
·Sudden weakness, trouble speaking, vision changes, or one-sided numbness
·Painful, unwanted erection that won't go away (priapism) in males
·Sudden shortness of breath, fast breathing, or chest pain
·Swelling and pain in hands and feet (dactylitis), especially in babies and toddlers
·Pale skin, lips, or nail beds (worse than the person's usual color)
·Yellow tint to the whites of the eyes or skin (jaundice)

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Red flags · escalate now

·Fever above 100.4°F (38°C) — infection can turn deadly fast because the spleen is damaged
·Any sudden weakness, slurred speech, vision loss, or numbness — suspect stroke until proven otherwise
·Chest pain, trouble breathing, or coughing — may be acute chest syndrome, which can kill quickly
·Priapism (unwanted erection) lasting more than 2 hours — permanent damage starts around 4 hours
·Sudden severe belly pain or a fast-growing belly — could be splenic sequestration (spleen trapping blood) or liver crisis

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Workup

·Complete blood count (CBC) with reticulocyte count
·Chest X-ray
·Pulse oximetry (oxygen saturation)
·Type and screen (blood type and antibody screen)
·Lactate dehydrogenase (LDH) and indirect bilirubin
·Blood culture
·Head CT or brain MRI (if stroke symptoms are present)

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Treatment

·Intravenous (IV) fluids at 1 to 1.5 times maintenance rate using normal saline or lactated Ringer's
·Intravenous opioid pain medication (morphine or hydromorphone) on a scheduled basis, not just as needed, plus acetaminophen or ibuprofen if kidney function is normal
·Supplemental oxygen by nasal cannula or mask if oxygen saturation is below the patient's baseline
·Incentive spirometry (a breathing device that encourages deep breaths) every 2 hours while awake, plus chest physiotherapy if needed
·Empiric antibiotics: ceftriaxone (a third-generation cephalosporin) plus azithromycin (a macrolide) if acute chest syndrome is suspected or fever is present
·Simple transfusion (adding donor red blood cells) or exchange transfusion (replacing the patient's blood with donor blood) for severe acute chest syndrome, stroke, multi-organ failure, or preparation for surgery
·Hydroxyurea (started or continued if already on it) as long-term disease-modifying therapy

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NCLEX trap

·Give isotonic IV fluids (normal saline or lactated Ringer's) at 1–1.5 times the daily maintenance rate — slow and steady. Pushing fluids too fast can flood the lungs and trigger acute chest syndrome (when sickled cells clog lung blood vessels). The goal is gentle hydration, not a fluid bolus race.
·Vaso-occlusive pain in sickle cell crisis is real bone and muscle pain caused by sickled red blood cells blocking tiny blood vessels and starving tissue of oxygen. This pain can be as severe as a broken bone. Guidelines (NHLBI, ASH) say give scheduled IV opioids — usually morphine or hydromorphone — within 30–60 minutes of arrival. Pain control is a core part of treatment, not optional.
·Give supplemental oxygen if the oxygen saturation (SpO₂) drops below the patient's baseline OR if acute chest syndrome is suspected — even if the oxygen number looks okay at first. Low oxygen makes hemoglobin S (the sickle form) polymerize (harden and stick together) more, which worsens sickling and makes the crisis worse. Keep oxygen above 95% to prevent more sickling.
·Always assess the lungs in sickle cell crisis. Acute chest syndrome (new lung infiltrate on chest X-ray plus chest pain, fever, cough, or low oxygen) is the leading cause of death in sickle cell disease. If the patient has fever, check breath sounds, get a chest X-ray, and measure oxygen. Acute chest can start hours after arrival, so watch closely. Never send someone home without ruling it out.
·Simple transfusion or exchange transfusion is reserved for life-threatening complications: severe acute chest syndrome (worsening low oxygen (hypoxia) despite oxygen), stroke, multi-organ failure, or splenic sequestration with cardiovascular collapse. A simple vaso-occlusive pain crisis with stable chronic anemia is treated with IV fluids, oxygen, pain control, and incentive spirometry — not routine transfusion. Over-transfusing raises the risk of iron overload and alloimmunization (making future transfusions harder).
·New focal weakness, slurred speech, vision changes, or altered mental status in sickle cell crisis is an acute blood-starved (ischemic) stroke (brain tissue is not getting blood because sickled cells clogged a brain artery) until proven otherwise. Get an urgent non-contrast head CT or MRI. Stroke is a neurologic emergency — exchange transfusion can restore normal blood flow and limit brain damage. Do not wait.

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