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Information about SCD

Published on February 29, 2008

Author: Carolina


Sickle Cell Disease and Trait: What Every Primary Care Physician Needs to Know:  Sickle Cell Disease and Trait: What Every Primary Care Physician Needs to Know Objectives:  Objectives Pathophysiology of sickle cell disease Inheritance of sickle cell disease Health maintenance for sickle cell disease Management of acute illness Slide3:  The Management of a child with sickle cell disease is best when overseen by a comprehensive sickle cell disease center. If unavailable, care should be provided in consultation with a pediatric hematologist. Sickle Cell Disease:  Sickle Cell Disease Pathophysiology What Is Sickle Cell Disease?:  What Is Sickle Cell Disease? An inherited disease of red blood cells Affects hemoglobin Polymerization of hemoglobin leads to a cascade of effects decreasing blood flow Tissue hypoxia causes acute and chronic damage Why Do Cells Sickle?:  Why Do Cells Sickle? Glutamic acid is substituted for valine Allowing the polymerization of sickle hemoglobin when deoxygenated Normal Vs. Sickle Red Cells:  Normal Vs. Sickle Red Cells Normal Disc-Shaped Deformable Life span of 120 days Sickle Sickle-Shaped Rigid Lives for 20 days or less Hemolysis and Vaso-occlusion :  Hemolysis and Vaso-occlusion Vaso-occlusion: Occurs when the rigid sickle shaped cells fail to move through the small blood vessels, blocking local blood flow to a microscopic region of tissue. Amplified many times, these episodes produce tissue hypoxia. The result is pain, and often damage to organs. Hemolysis: The anemia in SCD is caused by red cell destruction, or hemolysis, and the degree of anemia varies widely between patients. The production of red cells by the bone marrow increases dramatically, but is unable to keep pace with the destruction. Hemolysis and Vaso-occlusion (continued) :  Chronic Manifestations: Anemia Jaundice Splenomegaly Functional asplenia Cardiomegaly and functional murmurs Hyposthenuria and enuresis Proteinemia Cholelithiasis Delayed growth and sexual maturation Restrictive lung disease* Pulmonary Hypertension* Avascular necrosis Proliferative retinopathy Leg ulcers Transfusional hemosiderosis* Acute Manifestations: Bacterial Sepsis or meningitis* Recurrent vaso-occlusive pain (dactylitis, muscoskeletal or abdominal pain) Splenic Sequestration* Aplastic Crisis* Acute Chest Syndrome* Stroke* Priapism Hematuria, including papillary necrosis Hemolysis and Vaso-occlusion (continued) *Potential cause of mortality Sickle Cell Disease SCD Genotype:  Sickle Cell Disease SCD Genotype Sickle cell anemia (SS) Sickle Hb C disease (SC) Sickle S beta plus (Sβ+ thalassemia ) Sickle Beta zero (Sβ° thalassemia) 65% 25% 8% 2% Genotype Genotype prevalence Historical Distribution of Hemoglobin Variants:  Historical Distribution of Hemoglobin Variants Hemoglobin S Hemoglobin C Hemoglobin E Hemoglobin D Malarial Regions of Africa and Asia Alpha thalassemia occurs in all these regions as well Prevalence/Incidence of SCD:  Prevalence/Incidence of SCD In African-Americans the incidence of SCD is 1 in 375 for HbSS, 1 in 835 for HbSC and 1 in 1,667 for Sickle beta-thalassemia. In addition, 1 in 12 African-Americans are carriers for the disorder In other U.S. populations, the prevalence of sickle cell disease is 1 in 58,000 Caucasians; 1 in 1,100 Hispanics (eastern states); 1 in 32,000 Hispanics (western states); 1 in 11,500 Asians; and 1 in 2,700 Native Americans Sickle Cell Pedigree:  Sickle Cell Pedigree Parents with sickle cell trait: hemoglobin AS Probability of child with hemoglobin AA: 25% Probability of child with sickle cell trait AS: 50% Probability of child with sickle cell disease SS: 25% Sickle Cell Disease:  Sickle Cell Disease Newborn Screening Newborn Screening for Sickle Cell Disease:  Newborn Screening for Sickle Cell Disease 47 states, Washington DC, Puerto Rico, and the Virgin Islands provide mandatory universal newborn screening Specimen must be drawn prior to transfusion Prevention of pneumococcal septicemia Early Detection and treatment of splenic sequestration Linkage to timely diagnostic, parental education, and comprehensive care markedly reduces morbidity and mortality in infancy and childhood. Interpreting Newborn Screening Results Sickle Hemoglobinopathies:  Interpreting Newborn Screening Results Sickle Hemoglobinopathies Screening Results* Associated Disorder FS SS or Sβ°thalassemia FSC SC FSA S ß+ thalassemia FSE S Hemoglobin E FS Variant S Variant *Confirmatory testing requires hemoglobin separation by electrophoresis (cellulose acetate and citrate agar), isoelectric focusing, and/or high performance lipid chromatography. Solubility testing should never be used for confirmation. Interpreting Newborn Screening Results Hemoglobinopathy Carriers:  Newborn Screening Result Associated Carrier State FAS Sickle Cell Trait FAC Hb C Carrier FAE Hb E Carrier FA Variant Hb Variant Carrier Interpreting Newborn Screening Results Hemoglobinopathy Carriers Sickle Cell Disease:  Sickle Cell Disease Health Maintenance And Management Management:  Management Health maintenance Infection prevention Pain management Sickle emergencies Chronic disease management Health Maintenance:  Health Maintenance Frequent visits: every 3 to 6 months Immunizations Routine immunizations Hib- 6 months and older 23 valent Pneumovax at five years Penicillin prophylaxis beginning no later than two months Nutrition and fluids Folate supplementation is controversial Health Maintenance:  Health Maintenance Physical exam with attention to: Growth and development, jaundice, liver/spleen size, heart murmur of anemia, malocclusion from increased bone marrow activity, delayed puberty Lab evaluations: CBC with differential and reticulocyte count, urinalysis, renal & liver function Health Maintenance:  Health Maintenance Special studies Brain- Transcranial doppler ultrasonography, MRI/MRA Lungs- Pulmonary function tests, Echo cardiogram for pulmonary hypertension Neurologic- neuropsychological testing Current Recommendations:  Current Recommendations Penicillin Prophylaxis: SS, SbºThalassemia 2 months to 3 years: 125 mg PO BID Over 3 years: 250 mg PO BID When to discontinue is controversial Penicillin Prophylaxis: SC and Sb+ Thalassemia SC warrants penicillin prophylaxis similar to SS Sb+ Thalassemia: penicillin prophylaxis can be safely discontinued at 5 years Routine use in infants and children is controversial Special Circumstances History of repeated sepsis, surgical splenectomy Eye Examination:  Eye Examination Retinal vessel disease Incidence 33% in hemoglobin SC Incidence 3% in SS Annual evaluation after age 10 years by ophthalmologist Laser photocoagulation for vessel disease Emergencies:  Emergencies Fever/infection Acute chest syndrome Eye trauma (hyphema) Priapism Stroke Splenic sequestration Severe pain Fever and Infection:  Fever and Infection Fever > 38.5° C (101°F) is an EMERGENCY Basic laboratory evaluation: CBC with differential and reticulocyte count, blood, urine, and throat cultures, urinalysis, chest x-ray Indications for hospitalization & IV antibiotics: -Child appears ill -Any temperature > 40°C -Abnormal laboratory values Start IV antibiotics IMMEDIATELY if child appears ill or temperature > 40°C (DO NOT WAIT FOR LABS) Acute Chest Syndrome:  Acute Chest Syndrome Clinically: Acute onset of fever, respiratory symptoms, new infiltrate on chest x-ray Causes Infection Fat emboli Lung infarct Since you cannot distinguish between acute chest syndrome and pneumonia clinically there is no change in treatment. A leading cause of death in sickle cell disease Eye Trauma:  Eye Trauma Get sickle prep -rapid test- if sickle status unknown Complications if untreated: -glaucoma, -optic nerve atrophy, -retinal artery blockage Eye trauma is an emergency in ALL sickle conditions (including sickle trait) Priapism:  Priapism Treatment is difficult Opioid pain medication Intravenous fluids Aspiration and irrigation of the corpus cavernosum Surgery Blood Transfusions Impotence with severe disease or recurrent episodes Commonly occurs in children and adolescents with SS or SC Stroke:  Stroke Historically 8 to 10% of children with SS “Silent Stroke” in 22% of children with hemoglobin SS Any acute neurologic symptom other than mild headache, even if transient, requires urgent evaluation. Treatment: Chronic transfusion therapy to maintain sickle hemoglobin at or below 30% Splenic Sequestration:  Splenic Sequestration Sudden trapping of blood within the spleen Usually occurs in infants under 2 years of age with SS Spleen enlarged on physical exam, may not be associated with fever, pain, respiratory, or other symptoms Circulatory collapse and death can occur in less than thirty minutes Recurrence very common (50%) Associated with high mortality (20%) Splenic Sequestration:  Splenic Sequestration Hemoglobin SS Incidence increased: 6 and 36 months Overall incidence about 15% Hemoglobin SC Incidence increased: 2 and 17 years Mean age 8.9 years Can occur in adolescence and adulthood Incidence about 5% Treatments For Splenic Sequestion :  Treatments For Splenic Sequestion Intravenous fluids Maintain vascular volume Cautious blood transfusion Treat anemia, sequestered blood can be released from spleen Spleen removal or splenectomy If indicated Pain Management:  Pain Management Acute pain Hand-foot syndrome (dactylitis) Painful episodes: vasoocculsion Splenic sequestration Acute chest syndrome Cholelithiasis Priapism Avascular necrosis Right upper quadrant syndrome Pain Management:  Pain Management Pain is an emergency Hospital evaluation: Hydration: 1.5 times maintenance unless acute chest syndrome suspected Assess pain level and treat Do not withhold opioids Frequently reassess pain control Assess for cause of pain/complications Pain Management:  Pain Management Mild-moderate pain Acetaminophen Hepatotoxic Non-steroidal anti-inflammatory agents (NSAIDs) -Contraindicated in patients with gastritis/ulcers and renal failure -Monitor renal function if used chronically Pain Management:  Pain Management Moderate-severe pain Opioids are first-line treatment Morphine sulfate or hydromorphone Meperidine NOT recommended (Metabolite causes seizures & renal toxicity) Moderate or less severe pain Acetaminophen or NSAID's in combination with opioids Other adjuvant medications (sedatives, anxiolytics) May increase efficacy of analgesics Hand Foot Syndrome - Dactylitis:  Hand Foot Syndrome - Dactylitis Early complication of sickle cell disease Highest incidence 6 months to 2 years Painful swelling of hands and feet Treatment involves fluids and pain medication Fevers treated as medical emergency Renal Disease:  Renal Disease Renal findings Decreased ability to concentrate urine Decreased ability to excrete potassium Inability to lower urine pH normally Hematuria / papillary necrosis Risk factors for progressive renal failure Anemia, proteinuria, hematuria Gall Bladder and Liver:  Gall Bladder and Liver Gall stones and biliary sludge Monitor by ultrasound every 1-2 years Cholestasis May progress, leading to bleeding disorders or liver failure Iron overload Due to chronic transfusions Chronic hepatitis Bone Disease Diagnosis and Treatment:  Bone Disease Diagnosis and Treatment Avascular necrosis of hips and shoulders Index of suspicion Persistent hip or shoulder pain Plain film or MRI Treatment Conservative NSAID’s and 6 weeks of rest off affected limb Physical therapy Screening AVN:  Screening AVN Avascular Necrosis Hip Films Hip MRI Grading of AVN Grade I: MRI Grade II: Film/MRI Grade III: Film Grade IV: Film Grade V: Film No grade for AVN of the shoulder Chronic Complications :  Chronic Complications Anemia/Jaundice Brain Damage/Stroke Kidney failure Decreased lung function Eye disease (bleeding, retinal detachment) Leg ulcers Chronic pain management Anemia – Jaundice:  Anemia – Jaundice Common and starting in the first year of life Decreased lifespan of sickle red cells Hemolysis Anemia Hyperbilirubinemia Reticulocytosis Stroke:  Stroke Intracranial hemorrhage More common in adults Sequela overt and “silent strokes” Paralysis: overt stroke Neuropsychologic changes: both overt and silent strokes Visual-spatial impairment Impaired memory Poor impulse control Renal Disease:  Renal Disease Proteinuria/Nephrotic syndrome 40% of SCD patients with nephrotic syndrome develop end-stage renal disease Occurs in ~ 20% of all patients Occurs in 4.5% of all pediatric patients- increased in hemoglobin SS to 6.5% Increased incidence with age Increased with anemia, increased MCV, and increased leukocyte count Renal failure common in adults Leg Ulcers:  Leg Ulcers Occurs in about 25% of all hemoglobin SS patients Predominantly males Incidence increased with Age Decreased hemoglobin Incidence decreased with alpha thalassemia Recurrence rate is ~ 75% Chronic Pain:  Chronic Pain Pain lasting >3 to 6 months Patients should receive comprehensive psychologic and clinical assessment Treatment Analgesics Hydroxyurea TENS units Relaxation techniques Physical and occupational therapy Adolescents and Transition of Care:  Adolescents and Transition of Care Young adults (>20 years) with frequent pain crises at greatest risk for early death Barriers to care for young adults Lack of adult SCD providers Loss of medical coverage Developmental (level of independence, denial of chronic illness) Ineffective coping skills (passive versus active) Adolescents and Transition of Care:  Adolescents and Transition of Care Develop explicit plan for transition Team approach- pediatric and adult providers, social work, school/vocational staff, support groups Plan gradual transition (start 1 year before) Continue communication between pediatric & adult providers after transition Genetic Counseling :  Genetic Counseling Who should receive counseling? -Parents of newborns with sickle disorders or traits -Pregnant women/ prenatal counseling What is the purpose of counseling? -Education -Informed decision-making Content should include: -Genetic basis, chances of disease or trait (potential pregnancy outcome), disease-related health problems, variability/unpredictability of disease, family planning, average life span Slide52:  Information about sickle cell disease can be found through the American Academy of Pediatrics or from the National Institute of Health on line at:

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