Presentation on theme: "DN is a 26 yo man admitted for painful sickle cell crisis for one and a half days. He describes the pain as generalized, but especially affecting his chest."— Presentation transcript:
DN is a 26 yo man admitted for painful sickle cell crisis for one and a half days. He describes the pain as generalized, but especially affecting his chest and legs. He denied any fevers or chills, cough, or shortness of breath. PMH: Sickle cell anemia with frequent admissions for pain. In the last year he has been hospitalized for 143 days. ITP, treated with prednisone, Cholecystectomy, Penile prosthesis
Meds: prednisone, folate, MS Contin, Dilaudid PE:thin, african-american man in distress VS:P 108 RR 18 BP 145/81 T 98 Lungs: clear Cardiac: reg rhythm, flow murmur Abd: soft, nontender, liver 8 cm Neuro: intact Labs:WBC 46 Hct 22.5 Plt 266 CXR: no effusions or infiltrates
He was admitted and treated with morphine, IV hydration, and oxygen. Pain service was contacted and the patient was placed on a PCA pump. His hematocrit decreased to 17 and he received two units of PRBCs. He was slowly weaned from the PCA device and treated with oxycodone. He was discharged after 13 days in the hospital.
Sickle Cell Anemia Fall 2007 Bob Richard email@example.com
James B. Herrick American Heart Association James B. Herrick Award For Outstanding Achievement In Clinical Cardiology “Clinical Features of Sudden Obstruction of the Coronary Arteries” published in 1912. (he also described sickle cell disease)
Pauling, L and colleagues, Science Vol. 110, 1949
Internal Affections, Hippocrates (460-377 B.C.E.) “Another sickness of the spleen. It comes on mainly in the springtime and is caused by the blood. The spleen becomes engorged with blood, which evacuates into the stomach. Shooting pains in the spleen, the breast, the clavicle, the shoulder, and beneath the shoulder blade. The body’s coloration resembles lead. Sores form on the leg and become large ulcerations. The discharges with the feces are bloody and bluish green. The belly hardens and the spleen is like a stone. This one is more murderous than the one before, and few survive it.”
Hemoglobins Single base pair mutation results in a single amino acid change. Under low oxygen, Hgb becomes insoluble forming long polymers This leads to membrane changes (“sickling”) and vaso-occlusion HbF HbA HbA 2 s HbS
OXY-STATEDEOXY-STATE Deoxygenation of SS erythrocytes leads to intracellular hemoglobin polymerization, loss of deformability and changes in cell morphology.
Deoxyhemoglobin S Polymer Structure A) Deoxyhemoglobin S 14-stranded polymer (electron micrograph) D) Charge and size prevent 6 Glu from binding. C) Hydrophobic pocket for 6 Val B) Paired strands of deoxyhemoglobin S (crystal structure) Dykes, Nature 1978; JMB 1979 Crepeau, PNAS 1981 Wishner, JMB 1975
Hemoglobin polymerization is not the whole story Wide spectrum of disease phenotypes Some patients have mild disease 24 yo AA man in the army presents to the infirmary complaining of fatigue. CBC shows a Hgb of 8.5. Retic of 4.5%. Total Bili of 3.0. He is transferred to Walter Reed and sickle cell is diagnosed. NEJM 2007 Elderly Survivors with Homozygous Sickle Cell Disease (letter)
Clinical Variability! SS vs SC vs Sβ-thal Modifier genes (Epistasis) Hgb F (α 2 γ 2 ) α – Thal ? “Polymorphisms near a chromosome 6q QTL area are associated with modulation of fetal hemoglobin levels in sickle cell anemia”. Steinberg lab, Cell Mol Biol 2004 Feb;50(1):23-33. “Genetic dissection and prognostic modeling of overt stroke in sickle cell anemia”. Steinberg Lab. Nat Genet 2005 Apr;37(4):435-40.
The best HbF response to HU were less likely to have their HbS gene on a Bantu haplotype chromosome Senegal haplotype was associated with higher hemoglobin levels
Different pathophysiology Two subphenotypes? Vaso-occlusion Hemolysis ( NO resistant state) Pain, ACS, AVNPulm HTN, ulcers priapism, ?stroke HbF, WBCLDH, Bili HU more effectiveHU less effective
Sickle cell anemia affects 0.16% of African-Americans (80,000 and increasing) 1000 births a year in the US 120,000 in Africa Sickle trait is present in 8% Sickle cell disease includes SS, SC, S-thal SS makes up 50% of sickle cell disease Prevalence
Cooperative Study of Sickle Cell Disease, NEJM, Vol 330, No 23, 1994
Autopsy study - BJH, 2004 306 autopsies from 1929 – 1996 56 0 – 2 years old
Autopsy study - BJH, 2004 Age0-23-1112-17>18 Infection80.460.662.135.1 Stroke18.104.22.168.4 Therapy com.0013.89.9 Emboli0009.9 Sequestration22.214.171.124.5 Chronic Organ Failure0310.313.1 Most deaths occurred outside of the hospital or within 24 hours of admission
Pain in Sickle Cell Disease Natural history study of 3578 patients (Platt et al., NEJM 325:11-16, 1991): Average pain rate: HbSS: 0.8 episode per patient year HbS 0 thalassemia: 1.0 episode per patient year HbSC and HbS + thalassemia: 0.4 episodes per year Wide variation: 39% of patients with HbSS had no episodes of pain Only 1% of patients had >6 episodes per year 5% of patients had 33% of episodes Increased pain correlated with: Higher hematocrit (increased viscosity) Low fetal hemoglobin levels (pain rate inversely proportional to [HbF] 2 Early death
Pain Management BELIEVE THE PATIENT IV Fluids (D5 1/4 NS) Acute Pain Service Patient Care Plan Narcotic analgesics - AVOID meperidine (demerol): Hydromorphone (Dilaudid), MSO4 NSAIDs – Ketorolac et al., Cox 2 inhibitors O 2 - for hypoxia
Background Seamless Management of Pain in Adult Patients with Sickle Cell Diseases Donald Rucknagel 1,2,3, Annette Lavender 1,3, and Zahida Yasin 1,3 Cincinnati Comprehensive Sickle Cell Center 1, Divisions of Pediatric 2 and Medical 3 Hematology/Oncology, University of Cincinnati Discussion The pain of sickle cell diseases may be: 1. Acute Of variable severity. Localized Migratory Generalized Duration may be minutes, hours, days or weeks 2. Chronic We have developed a methodology over a period of years based upon the following observations: 1. Good analgesia requires utilizing equianalgesic principles; 2. If analgesia is not adequate patients will manipulate, thereby creating mistrust and conflict with medial staff; 3. Emergency department visits for moderate pain may occur simply because they lack analgesics at night and have no recourse. Our methodology, summarized in the algorithm, is based upon the following goals: 1. To assist the patient to have as normal a life style as possible; 2. To safely minimize the number of emergency department visits and hospital admissions; 3. To aggressively manage pain in a socially responsible manner. Patients are scheduled in the out-patient clinic at weekly to quarterly intervals, depending upon their needs. They are told never to allow themselves run out of analgesics for moderate pain. They can request prescriptions for small amounts of analgesics that are left at the information desk in the lobby of the University Hospital at their convenience Because of this manner with which we manage pain, we also are mindful of our obligation to administer the program in a socially responsible manner. When the pattern of use increases we first look for inter-current medical complications, such as infection or psychological stress. Patients are told that it may be necessary for us to screen urines or measure blood levels for opioids in order to better manage their pain. Integral to the preceding is excellent communication and cooperation with the emergency department. A spreadsheet there appraises them of each patient’s special needs and contains recommendations for initial analgesia, based upon tolerance of each patient evident during prior hospitalizations. The visits to the emergency department appear to have decreased with the implementation of this process, as have the number of hospitalizations. In our experience, “drug seeking behavior” has five causes: 1. Inadequate analgesia; 2. Pain avoidance, due in large measure, to the psychological association of pain with mortality; 3. Self-medication of psychological illness--anxiety or depression--with narcotics; 4. Selling or trading their medications; 5. Psychological dependency. Should the pattern of usage and opioid screening establish one of the above diagnoses, appropriate remedies are applied. Those deemed to be psychologically dependent must be evaluated, and if necessary, treated in a dependency treatment program. Written consent must be given to communicate with this program around the issue of compliance. Failure to comply results in restrictions placed on prescribing narcotics outside the hospital, thresholds for admission to the emergency department and to the hospital are increased. EQUIANALGESIC DOSES * IV/IM PO MORPHINE 10 mg 30 mg MEPERIDINE 70 280 HYDROMORPHONE 2 10 SR-MS 30 SR-oxycodone 20 SR = sustained release. Methodolog y Leave prescriptions for patients at the information desk of the University Hospital 5-15 mg IV MS+ 30-60 mg (or more) SR-MS Repeat IV MS every 45-60 minutes until comfortable. or 1-3 mg IV hydromorphone + 20-40 mg SR- oxycodone (or more) Repeat IV hydromorphone every 45-60 minutes until comfortable Send home or admit NSAID and/or acetaminophen /codeine #3 (40 tabs) and/or acetaminophen/oxycodon e (30 tabs) and SR- MS (30 tabs) or SR-oxycodone (30tabs) Mild In-patient Admission Severe Out-patient Clinic Emergency Department Moderate Pain Home 30-60 mg (or more) SR-MS every 12 hrs + 5-15 mg IV- MS every 4 hrs prn Increase SR-MS * daily until breakthrough use is minimal or 20-40 mg SR-oxycodone * (or more) every 12 hours + 1-3 mg IV- hydromorphone every 4 hrs prn until breakthrough use is minimal If patient is very ill or has ileus, convert to IV, either bolus or PCA, and later back to SR medication Convert from IV to oral breakthrough using po MS or oxycodone in 1- 2 days Discharge when stable and improving on SR-MS or SR- oxycodone
5-15 mg IV MS+ 30-60 mg (or more) SR-MS Repeat IV MS every 45-60 minutes until comfortable. or 1-3 mg IV hydromorphone + 20-40 mg SR-oxycodone (or more) Repeat IV hydromorphone every 45-60 minutes until comfortable Send home or admit NSAID and/or acetaminophen /codeine #3 (40 tabs) and/or acetaminophen/oxycodone (30 tabs) and SR- MS (30 tabs) or SR-oxycodone (30tabs) Mild In-patient Admission Severe Out-patient Clinic Emergency Department Moderate Pain Home 30-60 mg (or more) SR-MS every 12 hrs + 5- 15 mg IV- MS every 4 hrs prn Increase SR-MS * daily until breakthrough use is minimal or 20-40 mg SR-oxycodone * (or more) every 12 hours + 1-3 mg IV- hydromorphone every 4 hrs prn until breakthrough use is minimal If patient is very ill or has ileus, convert to IV, either bolus or PCA, and later back to SR medication Convert from IV to oral breakthrough using po MS or oxycodone in 1-2 days Discharge when stable and improving on SR- MS or SR-oxycodone
Chest syndrome New or progressive pulmonary infiltrate in a patient with sickle cell disease. –Admit and treat At least one of the following additional features is required for the diagnosis: the onset of chest pain, a temperature higher than 38.5°C, tachypnea, wheezing, or cough.
Causes and Outcomes of the Acute Chest Syndrome in Sickle Cell Disease NEJM, Volume 342:1855-1865 June 22, 2000
McMahon, L. E.C. et. al. N Engl J Med 1997;337:1293-1301 Infarction of the Femoral Head
Phospholipase A2 levels as a means to diagnose Chest syndrome Styles, LA, et al Blood 2000 Transfusion prevents acute chest syndrome predicted by elevated secretory phospholipase A2 (BJH 2007) –9 of the 13 patients who did not receive a transfusion developed ACS during hospitalisation versus none of those who were transfused Can blocking phospholipase A2 prevent chest syndrome?
Treatments Supportive care –Hydration, O 2, incentive spirometry Hydroxyurea Transfusion Stem Cell Transplant “New” agents –Clotrimazole (ICA-17043) –Chromatin modifiers (turn on fetal hemoglobin)
Pediatric care Long standing funding of the Comprehensive Sickle Cell Centers Milestones –PROS I and II –PED HUG –STOP Sickle Cell Treatment
“An Evidence-Based Approach to the Treatment of Adults with Sickle Cell Disease” ASH Education Book 2005 Multicenter Study of Hydroxyurea in Sickle Cell Anemia - Hydroxyurea reduces the frequency of painful episodes, acute chest syndrome, transfusions, hospitalizations Preoperative Transfusion in Sickle Cell Disease - Simple blood transfusion to increase the Hb level to 10 g/dL is as effective as exchange transfusion to reduce Hb S to 30% Prophylactic Transfusion in Pregnancy - Prophylactic blood transfusion to increase the Hb level to 10 g/dL compared to transfusion for Hb < 6 g/dL or for emergent indications did not improve obstetrical or perinatal outcomes but reduced the incidence of painful episodes Captopril for Albuminuria in Sickle Cell Anemia - Captopril reduces albuminuria in normotensive patients (22 patients) Poloxamer 188* for Treatment of Acute Vaso-occlusive Crisis - Poloxamer 188 reduces the duration of acute painful episodes Sickle Cell Treatment - Adults
Randomized, double-blinded, placebo controlled trial Hydroxurea treatment resulted in a 44% reduction in the median annual rate of painful crises There was also a significant decrease in the frequency of acute chest syndrome and the number of transfusions HU was stopped for a short time in almost all cases for transient marrow depression NEJM, Vol 332, No 20, 1995 Hydroxyurea can prevent painful episodes
How does hydroxyurea work? Steinberg, MH, NEJM, 340:1021-1030, 1999
Effect of Hydroxyurea on Mortality and Morbidity in Adult Sickle Cell Anemia JAMA. 2003;289:1645-1651. 1.5 (5.8) deaths per 3-month period on HU vs 2.6 (7.9) deaths per 3 months for people off HU; (P =.04) Increased Hgb F correlated with improved survival
What effect has HU had on sickle patients? In clinical trials, 44% decrease in hospitalizations, 40% decrease in mortality. But a review of records in MD before and after HU approval for sickle, no change in hospitalization rates or costs Lanzkron et al., Am J Heme, 2006 Same group at JHU have surveyed care givers and found less than half prescribed HU to all eligible patients
Transfusion in Sickle Cell Used correctly, transfusion can prevent organ damage and save the lives of sickle cell disease patients. Used unwisely, transfusion therapy can result in serious complications. http://www.nhlbi.nih.gov/health/prof/blood/sickle/index.htm
Simple transfusion – give blood Partial exchange transfusion - remove blood and give blood Erythrocytapheresis – use apheresis to maximize blood exchange When to use each method? Transfusion in Sickle Cell
In severely anemic patients, simple transfusions should be used. Common causes of acute anemia: acute splenic sequestration transient red cell aplasia Hyperhemolysis (infection, acute chest syndrome, malaria). If the patient is stable and the reticulocyte count high, transfusions can (and should) be deferred. Transfusion in Sickle Cell
In general, patients should be transfused if there is sufficient physiological derangement to result in heart failure, dyspnea, hypotension, or marked fatigue. Tends to occur during an acute illness or when hemoglobin falls under 5 g/dL. Transfusion in Sickle Cell
Except in severe anemia, exchange transfusion offers many benefits and is our first choice Phenotypically matched, leukodepleted packed cells are the blood product of choice. A posttransfusion hematocrit of 30 to 36 percent or less is recommended. Avoid hyperviscosity, which is dangerous to sickle cell patients. Transfusion in Sickle Cell (exchange transfusion)
Exchange transfusion: 1.Bleed one unit (500 ml), infuse 500 ml of saline 2.Bleed a second unit and infuse two units. 3.Repeat. If the patient has a large blood mass, do it again. Transfusion in Sickle Cell (exchange transfusion)
Transfusions usually fall into two categories: episodic, acute transfusions to stabilize or reverse complications. long-term, prophylactic transfusions to prevent future complications. Transfusion in Sickle Cell (exchange transfusion)
episodic, acute transfusions to stabilize or reverse complications. Limited studies have shown that aggressive transfusion (get Hgb S < 30%) may help in sudden severe illness. May be useful before general anesthesia. Vichinsky et al., NEJM 1995 Transfusion in Sickle Cell (exchange transfusion)
–Stroke –Chronic debilitating pain –Pulmonary hypertension –Setting of renal failure and heart failure Transfusion in Sickle Cell (chronic transfusion therapy)
Controversial uses: –Prior to contast media exposure –Sub-clinical neurological damage –Priapism –Leg Ulcers –Pregnancy Transfusion in Sickle Cell (chronic transfusion therapy)
Inappropriate uses of transfusion: –Chronic steady-state anemia –Uncomplicated pain episodes –Infection –Minor surgery –Uncomplicated pregnancies –Aseptic necrosis Transfusion in Sickle Cell
Other therapies: Potential treatment with ICA-17043 or ICA-17043
Hebbel, R. P. N Engl J Med 2000;342:1910-1912 The Process of Vaso-Occlusion in Patients with Sickle Cell Disease
Other therapies: 5-aza-2'-deoxycytidine Hypomethylating agent: results in reactivation of fetal hemoglobin Blood, Vol. 102, Issue 12, 3865-3870, December 1, 2003
Survival of sickle cell patients with pulmonary hypertension BMJ. 2003 Nov 15;327(7424):1151-5.
Gladwin, M. T. et. al. N Engl J Med 2004;350:886-895 Distribution (Panel A) and Frequency Distribution (Panel B) of Tricuspid Regurgitant Jet Velocity in 195 Patients with Sickle Cell Disease and 41 Black Control Subjects and the Association between Right Ventricular Systolic Pressure Measured by Doppler Echocardiography and Pulmonary-Artery Systolic Pressure, Measured during Catheterization (Panel C)
Survival after matched sibling allogeneic transplant for sickle cell BMJ. 2003 Nov 15;327(7424):1151-5.
Hospital course during and after transplant Tolerated conditioning (radiation and Campath infusion) without serious adverse events No significant need for parenteral antibiotics or nutritional support No sickle cell related events
Many different approaches Stable transduction of the stem cell with expression in the red cells Manipulating the expression of the various globin genes may be easier than replacing the sickle -globin gene Gene correction strategies are in the early stages Gene Therapy?
Management Summary New therapy offers patients with sickle cell disease a prolonged life span, with the potential to prevent or minimize complications that impair quality of life Multi-organ screening can now detect early injury and allow corrective intervention. Advances in transfusion therapy has resulted in improved safety. Advances in clinical therapy include prophylactic antibiotics, red cell pheresis, and hydroxyurea. Bone marrow transplantation has become accepted therapy for severely affected patients, but is only available for a minority of patients.
The first molecular disease, yet far from cured Sickling is more complicated than Hgb polymerization Understanding the biology of the red cell has led to possible treatment approaches Sickle Cell Disease 2007
Treatment Guidelines http://www.nhlbi.nih.gov/health/prof/blood/s ickle/sc_mngt.pdf 2002 – tweaked in 2004