Hematology & Oncology Flashcards
Immune thrombocytopenic purpura can be idiopathic, triggered by medications, or associated with other disorders, such as systemic lupus erythematosus, chronic lymphocytic leukemia, lymphoma, hepatitis C, or Helicobacter pylori infection &?
HIV
Patients who present with symptoms of mucocutaneous bleeding* and a *normal platelet count* should be evaluated for *acquired platelet dysfunction using?
Platelet Function Analyzer-100
Note: this test replaced the bleeding time test. Also, SSRIs & ginkgo biloba can increase platelet dysfunction
Patients with a Pulmonary Embolism Severity Index score of less than 65 are at low risk of death and may be managed in the outpatient setting with a
a non–vitamin K antagonist oral anticoagulant, such as apixaban or rivaroxaban.
Inflammatory anemia is usually mild to moderate in severity, characterized by low serum iron levels and total iron-binding capacity and elevated serum ferritin level, and usually requires?
No specific treatment
In patients with myelodysplastic syndrome requiring frequent transfusions, supplemental treatments to help decrease transfusion requirements, such as?
Lenalidomide, should be used to improve quality of life and decrease transfusion-associated iron overload & alloimmunization. Second-line treatments: azacitidine and decitabine
Note: Treatment of MDS has two goals. The first goal is to relieve transfusion dependence; the second is to prevent transformation to acute myeloid leukemia (AML).
Hypereosinophilic syndrome is characterized by moderate eosinophilia* and end-organ damage commonly involving the skin, lungs, gastrointestinal tract, and heart (e.g. *restrictive cardiomyopathy); what is the next step in management?
Secondary causes of eosinophilia should be excluded.
Note: causes of eosinophilia can be recalled using the mnemonic CHINA (Collagen vascular disease, Helminthic infection, Idiopathic, Neoplasia, Allergy/Atopy/Asthma).
Acute viral infections may trigger a transient aplastic crisis in patients with hereditary spherocytosis & should be managed with?
Observation
HS- characterized by a mild lifelong anemia in assoc. w/ symptomatic cholelithiasis at an early age. The presence of spherocytes is supported by an elevated mean corpuscular hemoglobin concentration frequently seen in this disorder. HS is caused by mutations in several scaffolding proteins that make these cells less distensible & more susceptible to osmotic stress & hemolysis. Patients with this disorder may have mild anemia, an elevated reticulocyte response, & few or no symptoms. The development of pigmented gallstones resulting from excess bilirubin production may result in symptomatic cholelithiasis.
Treat a patient with malignancy-associated pulmonary embolism with?
Low-molecular-weight heparin is the anticoagulant of choice for patients with active cancer and a venous thromboembolism.
Note: NOAC have been shown to be equally effective
In the presence of normal Doppler studies of the lower extremities, diagnose pulmonary embolism in a pregnant patient?
Ventilation-perfusion lung scanning is the initial lung imaging study to evaluate for pulmonary embolism in pregnant patients; D-dimer testing has no diagnostic role.
Patients scheduled for elective surgery who have anemia should be evaluated for?
Iron deficiency; preoperative management of iron deficiency anemia includes oral iron replacement and evaluation to determine the source of blood loss.
Should be used to reverse the effects of warfarin anticoagulation in patients experiencing severe bleeding and those requiring urgent surgery?
Four-factor prothrombin complex concentrate
4f-PCC should be avoided in patients with a history of heparin-induced thrombocytopenia because it contains residual heparin.
Idarucizumab is a monoclonal antibody that binds dabigatran & causes a rapid reduction in available in the body for up to 24 hours.
In approximately 10% of patients in whom an unprovoked venous thromboembolism is diagnosed, cancer will be found within 1 year, so ?
Age-appropriate screening test should be performed
Pancytopenia*, *immature leukocytes* with morphologic features consistent with promyelocytes, and *DIC, all of which are consistent with?
Acute promyelocytic leukemia (APML)
A bone marrow aspirate & biopsy confirm the diagnosis. Treatment is with all-trans retinoic acid, which targets the underlying defect in cellular differentiation.
In patients with IgG monoclonal gammopathy of undetermined significance (MGUS), an M spike of less than 1.5 g/dL*, and *normal findings on serum free light chain assay and urine protein electrophoresis, the risk of progression is low, so?
Extensive evaluation is not recommended, repeat labs in 6 months
In patients with multiple myeloma, hypogammaglobulinemia, and recurrent infections, treatment should include?
Intravenous immune globulin (IVIG), should be given to provide passive immunity against causative organisms.
A delayed hemolytic transfusion reaction, should be considered in a patient with low-grade fever and features of hemolytic anemia after recent transfusion (7-14 days). Diagnosis is confirmed using a?
Sxs: tea-colored urine, anemia, hyperbilirubinemia, scleral icterus
Direct antiglobulin (Coombs) test
Note: Flow cytometry use for the diagnosis of paroxysmal nocturnal hemoglobinuria (PNH), an acquired clonal stem cell disorder that should be considered in patients presenting with hemolytic anemia, pancytopenia, or unprovoked atypical thrombosis.
What is the treatment of choice for patients with bleeding and hypofibrinogenemia secondary to disseminated intravascular coagulation
Cryoprecipitate
This infection preferentially affects erythrocyte precursors in the bone marrow, causing transient pure red cell aplasia* in patients with *sickle cell anemia?
Parvovirus B19 infection
Note: Aplastic anemia (AA) is a condition characterized by pancytopenia with associated neutropenia, anemia, and thrombocytopenia and a severely hypocellular bone marrow.
Myelodysplastic syndrome (MDS) ranges in severity from an asymptomatic disease characterized by mild normocytic or macrocytic anemia to a transfusion-dependent anemia. MDS increases with age. Abnormal erythrocyte forms with basophilic stippling or Howell-Jolly bodies and dysplastic neutrophils with decreased nuclear segmentation and granulation may be present.
Patients with essential thrombocythemia who are older than 60 years or who have had previous thromboembolic complications should be treated with:
Aspirin and hydroxyurea
Typically appears as an isolated, mild neutropenia (1000-1500/µL [1-1.5 × 109/L]) found on routine testing in asymptomatic Black persons or certain other ethnic groups
Benign ethnic neutropenia
Acute hemolytic anemia, indicated by an acute reduction in the hemoglobin and haptoglobin levels & reticulocytosis, & the bite cells seen on the peripheral blood smear also suggest G6PD deficiency. A drug reaction should always be suspected in such settings?
Discontinue Dapsone, which is one of the most commonly encountered drugs leading to G6PD-mediated hemolysis. G6PD deficiency is X linked, so it is much more common in men, especially in those of African descent.
Normocytic anemia with a low reticulocyte count and normal erythrocyte morphology* in a patient with *underlying chronic kidney disease is usually caused by
Erythropoietin deficiency and will respond to therapy with an erythropoiesis-stimulating agent; however, normalization of the blood count is not advised.
Note: Inflammatory anemia, including a low TIBC & iron level & normal or elevated ferritin level. Myelodysplastic syndrome often have pancytopenia.
The finding of an IgG λ monoclonal gammopathy can also be associated with amyloidosis. Diagnosis requires biopsy of the affected organ and demonstration of characteristic apple-green birefringence with Congo red staining;
Fat pad biopsy is sometimes performed because it is less invasive
Treat iron deficiency due to malabsorption from inflammatory bowel disease with?
Parenteral iron is an appropriate alternative for restoring iron stores