Sickle Cell Crisis Management: Pain, Chest and Spleen

Sickle cell crisis management rests on the same core measures across almost every acute complication: oxygen, generous hydration, prompt pain control and early antibiotics, with transfusion reserved for specific indications. Pain crisis and acute chest syndrome are the two most common reasons for hospital admission, and acute chest syndrome is the leading cause of premature death, so speed and protocol matter.

This article sets out how Dr. Divya Doval, Principal Consultant - Haemato Oncology & BMT, BLK-Max Super Speciality Hospital, New Delhi, India, approaches each acute emergency in sickle cell disease: what triggers it, how it presents and how it is treated. The underlying biology and diagnosis are covered in the complete guide to diagnosis and management of sickle cell disease; stroke, the most devastating acute event, has its own article on stroke prevention and chronic organ damage.

Vaso-occlusive pain crisis: the most common complication

Acute painful episodes, or vaso-occlusive crises, are the biggest problem for people with sickle cell disease and its most common clinical complication. Sickled red cells become trapped in small vessels and block capillaries. At the same time, inflammatory mediators are released. The obstruction, the inflammation and repeated cycles of ischaemia and reperfusion together produce the pain.

The burden is heavy. Dr. Doval noted that one third of patients have pain almost daily. Most learn to manage it at home, but severe, refractory crises need admission and can last as long as two weeks.

Triggers to avoid

The common triggers of a pain crisis are:

• very cold temperatures;
• dehydration;
• infections and fever;
• any form of physical stress, including hypoxia, for example at high altitude.

Prevention follows directly: keep patients warm and well hydrated, and treat infections early.

Treating a pain crisis step by step

Dr. Doval's approach escalates in a defined sequence:

1. Non-steroidal anti-inflammatory drugs (NSAIDs) are first line for mild to moderate pain.
2. Opioids are added when NSAIDs are not enough; severe pain needs prompt opioid analgesia, ideally within an hour of arrival, with NSAIDs as an adjunct.
3. Ketamine infusion or regional anaesthesia are options for refractory pain that does not resolve.
4. Non-pharmacological therapies, such as massage and yoga, can be used alongside.

Supportive treatment runs in parallel: oxygen, hydration, a search for a source of infection and treatment with antibiotics, and incentive spirometry (a breathing device that encourages deep breaths and helps prevent lung collapse).

Blood transfusion is not indicated in a simple pain crisis. In the discussion, Dr. Doval clarified that there is no definitive treatment that ends a vaso-occlusive crisis: care is supportive, with oxygen, fluids and painkillers. Severe pain alone is not an indication for transfusion, which is reserved for complications such as acute chest syndrome or a symptomatic fall in haemoglobin.

Asked about the role of hydration, she described it as immense: anyone heading into, or in the middle of, a pain crisis benefits greatly from fluids.

Acute chest syndrome: the leading cause of premature death

Acute chest syndrome is the second most common cause of hospital admission in sickle cell disease and the leading cause of premature death. Recurrence is common: Dr. Doval put the recurrence rate at 80%.

Recognising it

Acute chest syndrome presents like pneumonia: fever, chest pain, shortness of breath, cough and falling oxygen saturation. It often begins 24 to 72 hours into an acute pain episode, so a patient admitted with a pain crisis who develops respiratory symptoms needs immediate reassessment.

The diagnosis is made on new pulmonary infiltrates on chest X-ray. Dr. Doval warned that the radiological picture often lags behind the clinical signs, frequently by as much as 12 hours. A normal early X-ray in a deteriorating patient therefore does not exclude the diagnosis.

Causes and investigations

The usual causes are lung infection, fat embolism, pulmonary infarction and hypoventilation (shallow breathing, often from chest pain or opioid sedation). Investigations are:

• full blood count and inflammatory markers;
• blood gas;
• blood cultures;
• chest X-ray, repeated if needed given the radiological lag.

Treatment

Treatment combines several measures at once:

• intravenous fluids and oxygen;
• control of the underlying pain crisis;
• adequate antibiotics;
• incentive spirometry;
• close monitoring.

If the pneumonia progresses, saturations do not settle or oxygen requirements increase, a blood transfusion may be needed. If the situation worsens and does not settle over 12 hours, a red cell exchange (removing the patient's sickle cells while replacing them with donor cells) is considered, depending on the clinical picture.

Prevention

Primary prevention means managing pain crises optimally, monitoring closely, using incentive spirometry and treating infections pre-emptively. Secondary prevention, after a first episode, centres on starting hydroxyurea and considering chronic transfusion. At Dr. Doval's centre, a single episode of acute chest syndrome is now itself an indication to consider stem cell transplant in a child.

Why children with sickle cell disease are prone to infection

Children with sickle cell disease lose the function of their spleen early, which leaves them at high risk from bacterial infection. Repeated splenic infarcts mean that, within a couple of years, the splenic tissue has effectively died, leaving functional asplenia by 2 to 3 years of age. Without a working spleen, children are at high risk from encapsulated bacteria, especially Streptococcus pneumoniae. The consequences include septicaemia, meningitis and osteomyelitis.

Patients are also susceptible to Salmonella, Haemophilus influenzae, meningococcus and Mycoplasma.

Prevention rests on two measures:

• Vaccination, including the conjugate pneumococcal vaccine, alongside the other routine vaccines.
• Penicillin prophylaxis, started as early as possible.

Any fever in a child with sickle cell disease should be treated as potentially serious.

Splenic sequestration: a hypovolaemic emergency

Splenic sequestration occurs when vaso-occlusion inside the spleen causes red cells to pool there. Blood is effectively trapped in the spleen, producing hypovolaemic shock (shock from too little circulating blood). It is an emergency and usually affects young children.

It presents with:

• left upper quadrant pain and fullness;
• a sudden fall in haemoglobin of more than 2 g/dL;
• reticulocytosis (a rise in young red cells);
• an enlarging spleen.

Treatment is transfusion, with two cautions. Transfuse slowly, because a sudden rise in haemoglobin increases blood viscosity and can worsen sickling. And watch the volume load, because sequestered blood can return to the circulation as the crisis resolves.

Aplastic crisis after parvovirus B19

An acute aplastic crisis is caused by parvovirus B19 infection, which temporarily halts red cell production. It is common in children with HbSS disease. It presents with sudden fatigue, shortness of breath and fever, and the haemoglobin can fall abruptly by 3 to 6 g/dL from baseline. The key laboratory distinction from sequestration is that reticulocytes are decreased, not increased.

Treatment is supportive care with red cell transfusion. Infection produces lifelong humoral immunity, so an aplastic crisis does not recur.

Priapism in sickle cell disease

Priapism is a sustained, unwanted, painful erection lasting more than 4 hours. In sickle cell disease it is caused by veno-occlusion, which reduces venous outflow from the penis. It is extremely painful, and severe or recurrent episodes can lead to permanent erectile dysfunction. It is common in boys and men with the disease, with a reported lifetime prevalence of 20 to 30%, and up to 89% in some series.

Management follows a sequence:

1. Intravenous hydration and pain management, with oxygen and the other supportive measures used for any sickle crisis.
2. Urgent urology review for an episode lasting 4 hours or more, for aspiration of blood from the penis and irrigation, with injection of vasoactive agents to help the erection subside.
3. Surgical shunting for refractory cases. Blood transfusion is not recommended as a primary treatment for acute priapism.

Persistent priapism that does not respond to standard therapy is also one of the indications for starting hydroxyurea.

Acute eye emergencies in sickle cell disease

Two acute eye complications need urgent recognition.

Central retinal artery occlusion is an ocular emergency, more common in children and young adults. It presents with sudden loss of vision. Treatment is a simple or exchange transfusion.

Orbital infarction can occur during a vaso-occlusive crisis. It presents with protrusion of the eye, eye pain and sudden swelling of the lid and orbit. Treatment is intravenous fluids, pain control and steroids.

Acute kidney complications

Renal papillary necrosis results from repeated infarction of the renal medulla and affects around 15% to 30% of people with sickle cell disease. It presents with painful or painless blood in the urine and can be complicated by urinary infection or obstruction. Treatment is hydration, alkalinising the urine, treating any infection and relieving obstruction.

Asked about urine alkalinisation more broadly in vaso-occlusive crisis, Dr. Doval explained that alkaline urine helps prevent acidosis, infection and crystallisation, and in her view helps with pain overall. Urine alkalinisation is not part of standard guideline-based treatment of vaso-occlusive crisis, where hydration and analgesia remain the core.

Acute kidney injury can follow an acute pain episode or chest crisis, or form part of multi-organ failure. Dr. Doval emphasised:

• daily monitoring of creatinine and of fluid intake and output;
• avoiding nephrotoxic drugs;
• involving a nephrologist early.

Acute liver complications

The liver is affected in three ways during acute sickling:

• Acute sickle hepatic crisis, treated with supportive care, with red cell exchange considered if it worsens.
• Hepatic sequestration, analogous to splenic sequestration, treated with blood transfusion and supportive care.
• Sickle intrahepatic cholestasis, where sickling occurs within the liver sinusoids, treated with supportive care, with red cell exchange considered according to the clinical situation.

Gallstones, a consequence of chronic haemolysis, are treated with cholecystectomy. Other liver problems include thrombosis, Budd-Chiari syndrome (blockage of the hepatic veins) and liver abscess.

Sickle cell crisis management at a glance

From crisis care to prevention

Every acute crisis that is managed well protects organs, and every recurrent crisis is a signal to escalate disease-modifying treatment. Hydroxyurea is indicated after more than three pain crises a year or more than two chest crises, and is offered to all children with HbSS or HbS beta-zero thalassaemia from 9 months of age, and recurrent admissions are an indication for transplant evaluation. Both are covered in the guide to hydroxyurea, transfusion and newer sickle cell therapies. Clinicians' questions on priapism, hydration and urine alkalinisation, with Dr. Doval's full answers, are on the Live Discussion page.