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Hematology Medications: A
Comprehensive Overview
1. Differentiating Core Drug Categories for Circulation
The management of blood circulation and clotting involves three primary classes of medications, each with a distinct function. Understanding their fundamental differences is crucial for comprehending their therapeutic applications. Drug Class Primary Action Mnemonic / Simple Explanation Primary Use Anticoagulants Prevent the formation of new clots and inhibit the growth of existing clots. They do not dissolve clots that have already formed. "Clot Preventers" Preventing and treating venous thrombosis (DVT, PE), stroke prevention in atrial fibrillation. Antiplatelets Prevent platelets from aggregating (clumping together) to form a clot. "Platelet Un- stickers" Preventing arterial thrombosis, particularly after a myocardial infarction (MI) or stroke. Thrombolytics Actively attack and dissolve blood clots that have already formed. "Clot Busters" Emergency treatment of ischemic stroke, MI, and massive pulmonary embolism (PE).
- Heparin an Warpin inhibits Vitamin K, which leads to decrease bone density and
- Anticogagulants are all going to have the same thing because they want to stop clottings
- Side effects: bleeding and bruising due to stopping clot prevention, nose bleeds
- monitor
2. Anticoagulants: Preventing Clot Formation
Anticoagulants are a cornerstone of therapy for venous and arterial disorders that pose a high risk of clot formation. They work by interfering with the body's natural coagulation cascade.
Heparin and Low-Molecular-Weight Heparins (LMWHs)
Heparin and its derivative, LMWH, are parenteral anticoagulants used for rapid effects. Feature Standard Heparin Low-Molecular-Weight Heparin (LMWH) Mechanism Combines with antithrombin III, accelerating the anticoagulant cascade and preventing the conversion of fibrinogen to fibrin, inhibit clot formation; they do NOT dissolve clots that are present Primarily inactivates Factor Xa, with less ability to inactivate thrombin.; Lower risk for bleeding Indications Rapid effect for DVT, PE, evolving stroke, open-heart surgery, DIC, MI, artificial heart valves. Prevention of DVT and PE, especially after orthopedic or abdominal surgery. Administra tion , IV (continuous drip) or SubQ 2x day.
- Injectable heparin is given through abdominal tract, not near underwear line because bruising can occur SubQ.
o Fresh Frozen Plasma (FFP): Indicated for acute, uncontrollable bleeding.
- Key Nursing Considerations: o Bleeding Risk: Patients must monitor for petechiae, ecchymosis (bruise), tarry stools, and hematemesis. Bleeding occurs in about 10% of patients. o Drug/Herbal Interactions: Warfarin is highly protein-bound and affected by numerous drugs. Patients should avoid garlic, ginger, green tea, and ginkgo, as they may increase bleeding risk. o Diet: Patients should be advised to maintain a consistent intake of green, leafy vegetables (high in Vitamin K). o Monitor specialized blood work: CBC, PT PTT, INR o Heparin/WArfin therapy o Avoid drugs that have anti-coagulation properties: ASA, NSAIDS o Wear medical alert bracelet for anticoagulant therapy o Monitor EKG, allergic rx: Hives, Itching, Tachycardia Clincal Judgment Concept
- Clotting Recognize cues
- Obtain a history of abnormal clotting problems.
- Gather a drug history including complementary and alternative therapy history. Analyze cues and prioritize hypothesis
- Bleeding, dehydration, tissue injury Generate solutions
- The patient will not have excess bleeding Take action
- Monitor PT, INR for warfarin, and aPTT for heparin before administering anticoagulant. ; check labs EVERY DAY
- Examine the patient’s nose, mouth, skin, urine for bleeding.
- Teach patient to inform dentist when taking an anticoagulant.
- Advise patient to use a soft toothbrush to prevent bleeding gums.
- Advise patient to avoid large amounts of green, leafy vegetables or be consistent with intake.
Evaluate outcomes
Direct-Acting Anticoagulants
These newer agents offer more targeted mechanisms and often do not require routine blood monitoring., less chance of calling bleeding, and can be taken orally Direct Thrombin Inhibitors These drugs directly inhibit the enzyme thrombin, preventing it from converting fibrinogen to fibrin.
- Examples: o Oral: Dabigatran, Rivaroxaban (Xarelto), Apixaban (Eliquis) o IV: Argatroban, Bivalirubin, Lepirudin o SubQ: Desirudin
- Indications: Prevention of stroke in non-valvular atrial fibrillation, DVT, and PE.
- Monitoring: The preferred lab for some is aPTT.
- Antidote: Idarucizumab is the reversal agent for dabigatran. Direct Factor Xa Inhibitors These agents inhibit the conversion of prothrombin to thrombin by targeting Factor Xa. Preventing fibrinogen from clinging directly to fibrin and forming a clotp
- Examples (Oral): o Rivaroxaban (Xarelto) o Apixaban (Eliquis)
- Indications: Postoperative prophylaxis for DVT/PE (Rivaroxaban); stroke prevention in non-valvular atrial fibrillation (Apixaban).
- Advantage: Pre- and post-lab tests are not required.
- Antidote: Andexanet alfa is the reversal agent.; Idarucizumab is the reversal agent for dabigatran.
- Indications: Ischemic stroke (within 3-4.5 hours of symptom onset), myocardial infarction (3-8 hours for it to work), massive pulmonary embolism (preventing the client to breathe).
- Contraindications: Hemorrhagic stroke, recent contusion or major surgery (especially intracranial or spinal), internal bleeding, or severe uncontrolled hypertension.
- Major Adverse Effect: Hemorrhage. Anaphylactic reactions are more frequent with streptokinase.
- Antidote: Aminocaproic acid is used to stop bleeding by inhibiting plasminogen activation.
- Nursing Considerations: o Avoid venipuncture, arterial sticks, and other invasive procedures for 72 hours after administration; must do invasive procedures BEFORE thrombolytic is given o Monitor for bleeding o Anticoagulants and antiplatelet drugs should be avoided until the thrombolytic effect has passed. o Use soft toothbrush o Don't mess
5. Hematologic Stimulants and Support Agents
Red Blood Cell Stimulants
- Erythropoietin: A glycoprotein hormone produced by the kidney that stimulates red blood cell production. It is given to patients with severe anemia when blood transfusions are not an option, such as in kidney failure. o Requirement: Patients must have adequate iron levels for the drug to be effective. o Side Effects: Can include MI, thrombophlebitis, stroke, and high blood pressure. o Contraindications: Heart failure.
Vitamins and Minerals Essential for Blood Health
Nutrient Function Signs of Deficiency Key Food Sources Administration Notes Iron Essential for making hemoglobi n and myoglobin. Iron-deficiency anemia. Beans, lentils, tofu, spinach, baked potatoes, fortified cereals. Oral iron should be given with food, and a straw should be used to avoid staining teeth. Z-tract administration for IM injections. Iron toxicity is a serious risk in children. Folic Acid (Folate) Helps the body produce and maintain red blood cells. Crucial for preventing neural tube defects in fetuses. Anorexia, nausea, fatigue, alopecia, blood dyscrasias. In pregnancy, can affect fetal CNS development.
N/A
(supplement s are primary) The CDC urges women of reproductive age to take 400 mcg daily. Vitamin B Prevents megalobla stic (pernicious ) anemia. Deficiency related to lack of intrinsic factor (GI absorption issues like Crohn's, celiac disease). Dairy products, eggs, fish, meat, poultry. Can be given orally or as an IM injection (cyanocobalamin). Certain PPIs and metformin can interfere with B absorption. Copper Works with iron to develop RBCs and helps the body Anemia, decrease in WBCs, glucose intolerance. Shellfish, seeds, nuts, organ meats, chocolate. Excess is associated with Wilson’s disease (copper accumulation).
Digoxin Digoxin Immune Fab (Digibind)
Laboratory Monitoring for Anticoagulants
Drug Lab Test Therapeutic Range Heparin aPTT Up to 40 seconds (Control: 20-35 sec) Heparin PTT 1.5 - 2.0 times control (Control: 60-70 sec) Warfarin PT 1.25 - 2.5 times control (Control: 11-15 sec) Warfarin INR 2.0 - 3. The lab test known as the PTT (Partial Thromboplastin Time) is a laboratory test used to monitor clotting time, particularly when a patient is receiving anticoagulation therapy. PTT Values and Therapeutic Response
- Control/Normal Value The control or normal value for the PTT (Partial Thromboplastin Time) is 60 to 70 seconds.
- Therapeutic Response and Monitoring The PTT is one of the laboratory tests used to monitor heparin therapy. The goal for the therapeutic response when a patient is receiving anticoagulation (specifically for heparin) is to achieve a PTT within the designated range:
- The therapeutic range is 1.5 to 2 times the control value. Note: While PTT is listed, the source also mentions that aPTT (Activated PTT), with a control of 20 to 35 seconds, is often monitored for heparin, and is the preferred lab to monitor for the direct thrombin inhibitor Dabigatran. However, for the PTT specifically, the therapeutic range for heparin is 1.5 to 2 times the 60 to 70 second control.
- Indication of Results The PTT value provides critical information about the patient's risk profile:
- High Values: A high PTT value indicates a longer time for the blood to clot , suggesting a higher risk of bleeding.
- Low Values: A low PTT value indicates a shorter time for the blood to clot , suggesting a higher risk of thrombosis (clot formation)
7. Blood Transfusions
A blood transfusion is the infusion of whole blood or its components (plasma, RBCs, platelets) into the venous system to restore volume, increase oxygen-carrying capacity, or provide clotting factors.
- Key Risks: Transmission of infections (Hepatitis B/C, HIV), fluid volume overload, and transfusion of the wrong blood type.
- Verification Process: Before a transfusion begins, the blood product must be checked by two licensed professionals. The check includes: o Provider's order and signed patient consent. o Matching the patient's ID bracelet barcode to the barcode on the blood slip and bag. o Verifying blood type, unit number, and expiration date on the bag.
- Administration: o Blood must be initiated within 30 minutes of arriving on the unit and completed within 4 hours. o Normal Saline (0.9% sodium chloride) is the only IV solution used with blood products. o A large-bore catheter (e.g., 18 gauge) is used to prevent hemolysis.
- Transfusion Reaction: o Signs & Symptoms: Decreased BP, increased pulse, fever, hives, dizziness, back pain, shortness of breath, or chest pain. o Immediate Nursing Actions: ▪ Stop the transfusion immediately and disconnect the tubing. ▪ Infuse normal saline through a new IV line to keep the vein open. ▪ Monitor vital signs every 15 minutes.
