sickle cell disease - Nursing Case Study

Pathophysiology

• Primary mechanism: Sickle cell disease is caused by a mutation in the HBB gene, leading to the production of abnormal hemoglobin S (HbS). Under low oxygen conditions, HbS molecules polymerize, causing red blood cells to become rigid and sickle-shaped.

• Secondary mechanism: The sickled cells obstruct capillaries and small blood vessels, reducing blood flow and oxygen delivery to tissues, which can result in ischemic damage and pain crises.

• Key complication: Chronic hemolysis of sickled cells leads to anemia and increased bilirubin levels, contributing to jaundice and gallstone formation, while repeated vaso-occlusive episodes can cause organ damage and increase the risk of infections.

Patient Profile

Demographics:

28-year-old female, school teacher

History:

• Key past medical history: Sickle cell disease diagnosed at age 3, history of vaso-occlusive crises, mild splenomegaly

• Current medications: Hydroxyurea, folic acid, acetaminophen as needed

• Allergies: Penicillin

Current Presentation:

• Chief complaint: Increased fatigue and joint pain

• Key symptoms: Shortness of breath, persistent headache, mild jaundice, swelling in the hands and feet

• Vital signs: Temperature 100.4°F (38°C), Heart rate 102 bpm, Blood pressure 108/64 mmHg, Respiratory rate 22 breaths/min, Oxygen saturation 92% on room air

Section 1

During the initial assessment, the nurse notes that the patient appears visibly fatigued and is experiencing moderate discomfort, primarily due to the joint pain in her hands and feet. Her skin shows mild jaundice, and there is notable swelling in her hands and feet. Auscultation of the lungs reveals scattered crackles at the bases, suggesting possible fluid accumulation. The patient's oxygen saturation has decreased slightly, and she is now requiring supplemental oxygen to maintain adequate levels. This increase in oxygen demand indicates a potential exacerbation of her sickle cell condition, necessitating further investigation to rule out acute chest syndrome or other complications.

Laboratory tests are promptly ordered, revealing a hemoglobin level of 7.2 g/dL, indicating significant anemia, likely due to increased hemolysis of sickled cells. Elevated bilirubin levels of 3.5 mg/dL corroborate the presence of hemolysis, which is contributing to her jaundice. Additionally, a reticulocyte count is increased at 12%, indicating the bone marrow's response to anemia by producing more red blood cells. Inflammatory markers, such as C-reactive protein (CRP), are also elevated, suggesting an underlying inflammatory process. These findings, combined with her symptoms of shortness of breath and fever, raise concerns for a vaso-occlusive crisis with potential complications, such as acute chest syndrome or a new infection.

Based on these findings, the clinical team decides to initiate a blood transfusion to address the anemia and improve oxygen delivery to tissues. Pain management is adjusted to include intravenous opioids for better control of her joint pain. The team also considers starting broad-spectrum antibiotics as a precautionary measure against possible infection, given her fever and elevated CRP levels. Continuous monitoring of her respiratory status and oxygenation is crucial, as well as close observation for any signs of further complications. These interventions aim to stabilize her condition and prevent progression, while allowing the team to further evaluate and refine the treatment strategy based on her response.

Section 2

As the clinical team implements the initial interventions, the patient shows a mixed response. Following the blood transfusion, her hemoglobin level rises to 9.0 g/dL, leading to a modest improvement in her energy levels and a reduction in her fatigue. However, despite these positive changes, her respiratory status remains a concern. Her oxygen saturation is stable at 92% with supplemental oxygen, yet she continues to exhibit labored breathing. A follow-up chest X-ray is performed, revealing new infiltrates in the right lower lobe, which raises suspicion for acute chest syndrome, a common and serious complication in sickle cell disease.

Simultaneously, the patient begins to experience increased abdominal pain, which was previously mild and intermittent. On examination, her abdomen is tender, particularly in the right upper quadrant, and she appears to be guarding. Laboratory tests reveal a further elevation in her bilirubin level to 4.2 mg/dL, and liver function tests indicate an increase in AST and ALT, suggesting potential hepatic involvement. These findings, combined with her persistent fever and elevated inflammatory markers, suggest the possibility of hepatic sequestration, a complication where sickled cells become trapped in the liver, exacerbating her condition.

The clinical team revisits the treatment plan, acknowledging the need for more aggressive management of her respiratory and abdominal symptoms. They decide to escalate her care by increasing the oxygen flow rate and adjusting her pain management regimen to address the new abdominal pain. Further diagnostic imaging, such as a CT scan of the abdomen, is considered to assess for complications like hepatic sequestration or gallbladder involvement. The team continues to monitor her closely, aware of the potential need for additional interventions, such as exchange transfusion, if her condition does not stabilize. This careful observation and timely intervention aim to prevent further deterioration and guide the next steps in her care journey.

Section 3

As the clinical team continues to manage the patient's condition, they focus on her respiratory status and the potential development of acute chest syndrome. Despite the increased oxygen flow rate, her oxygen saturation hovers around 90-91%, and her respiratory rate has increased to 28 breaths per minute. Auscultation of her lungs reveals diminished breath sounds in the right lower lobe, correlating with the infiltrates seen on the chest X-ray. The decision is made to initiate high-flow nasal cannula therapy to better support her oxygenation needs and potentially prevent further respiratory compromise. In addition, broad-spectrum antibiotics are started to cover potential infectious causes contributing to the acute chest syndrome.

Simultaneously, the patient's abdominal pain is reassessed. The CT scan of the abdomen confirms hepatic sequestration, with significant engorgement of the liver and no evidence of acute cholecystitis. Her bilirubin level has climbed further to 5.0 mg/dL, indicating worsening hepatic involvement. The pain management regimen is adjusted to include intravenous opioids, and a consultation with hematology is sought to discuss the potential need for an exchange transfusion. The patient's vital signs reveal a heart rate of 110 beats per minute and a blood pressure of 100/60 mmHg, which, although stable, will require close monitoring given her complex clinical picture.

As the team reflects on the evolving situation, they remain vigilant for any signs of multi-organ involvement, a risk in severe sickle cell crises. The integration of these new findings underlines the importance of a multidisciplinary approach, combining respiratory support, pain management, and hematological interventions. The next steps in her care will hinge on her response to these intensified treatments, with plans to reassess her condition frequently to detect any further complications early.

Section 4

As the clinical team continues to monitor the patient closely, they notice a change in her overall status that requires immediate attention. Despite the high-flow nasal cannula therapy, her oxygen saturation has decreased further to 87%, and her respiratory rate has increased to 32 breaths per minute, raising concerns about the progression of acute chest syndrome. The patient now exhibits increased work of breathing, with the use of accessory muscles and nasal flaring. A repeat chest X-ray shows an increase in the infiltrates on the right side, and new infiltrates are beginning to appear in the left lower lobe. These findings suggest worsening pulmonary involvement, prompting the team to consider additional respiratory support measures, such as non-invasive ventilation or even intubation, if her condition does not stabilize with current interventions.

Concurrently, the patient's laboratory results reveal a drop in her hemoglobin level to 6.8 g/dL, a critical finding that suggests hemolysis and further sequestration. Her reticulocyte count is elevated, indicating the bone marrow's response to the increased destruction of red blood cells. The rising bilirubin level suggests continued hepatic dysfunction, which, coupled with her tachycardia and hypotension, points to a potential progression towards multi-organ involvement. The hematology team is urgently consulted, and they recommend proceeding with an exchange transfusion to reduce the sickle cell load and improve oxygen delivery. As these interventions are initiated, the multidisciplinary team remains focused on her fluid balance and renal function, wary of the potential for acute kidney injury given her current hemodynamic state.

This critical juncture in her care prompts the team to reassess their strategies, ensuring that each aspect of the patient's management is coordinated effectively. The ongoing collaboration between specialties is crucial as they aim to stabilize her respiratory status, mitigate the effects of systemic complications, and prevent further deterioration. The next phase of her management will depend on her response to these intensified treatments, with plans for continuous monitoring and reassessment as they strive to reverse the trajectory of her current crisis.

Section 5

As the clinical team implements the exchange transfusion and adjusts respiratory support, they notice a significant change in the patient's status. Her oxygen saturation begins to stabilize slightly at 90%, and her respiratory rate decreases to 28 breaths per minute, indicating a modest improvement in her respiratory distress. However, the patient continues to exhibit signs of increased work of breathing, and the use of accessory muscles remains prominent. Despite these improvements, her vital signs reveal new concerns: her blood pressure has dropped to 88/52 mmHg, and her heart rate remains elevated at 126 beats per minute, suggesting persistent hemodynamic instability.

A repeat set of laboratory results highlights further complications. While her hemoglobin level has improved slightly to 7.2 g/dL post-transfusion, her serum creatinine has risen to 2.1 mg/dL, indicating potential acute kidney injury. This increase, coupled with her elevated blood urea nitrogen (BUN) of 34 mg/dL, suggests the need for careful monitoring of her renal function and consideration of nephroprotective strategies. Additionally, her lactate level has increased to 3.8 mmol/L, raising concerns about tissue hypoxia and ongoing metabolic distress.

In response to these evolving challenges, the multidisciplinary team refines their management plan. They initiate a low-dose dopamine infusion to support renal perfusion and consider the need for continuous renal replacement therapy (CRRT) if her renal status deteriorates further. The hematology team continues to monitor for further signs of hemolysis, while the respiratory team evaluates the need for potential escalation to mechanical ventilation if non-invasive measures fail to achieve adequate oxygenation. The team's coordinated efforts remain focused on stabilizing her condition, with frequent reassessments to guide ongoing treatment decisions and prevent further complications.