Podcast
Questions and Answers
What is the normal range for bleeding time as per Duke's method?
What is the normal range for bleeding time as per Duke's method?
- 1 - 3 minutes
- 4 - 8 minutes
- 3 - 7 minutes (correct)
- 5 - 10 minutes
Which material is NOT required for the Duke's method?
Which material is NOT required for the Duke's method?
- Disposable lancet
- Thermometer (correct)
- Alcohol swab
- Filter paper
What action is taken immediately after making a puncture in the Duke's method?
What action is taken immediately after making a puncture in the Duke's method?
- Clean the area with saline
- Blot the blood immediately
- Apply pressure to stop the bleeding
- Start the stopwatch (correct)
Which of the following is NOT a reason for prolonged bleeding time?
Which of the following is NOT a reason for prolonged bleeding time?
How is the blood collected during the bleeding time measurement?
How is the blood collected during the bleeding time measurement?
What is the primary function of platelets in hemostasis?
What is the primary function of platelets in hemostasis?
Which of the following methods is NOT used to perform the bleeding time test?
Which of the following methods is NOT used to perform the bleeding time test?
What does the bleeding time test specifically assess?
What does the bleeding time test specifically assess?
Which stage of blood clot formation involves the aggregation of platelets?
Which stage of blood clot formation involves the aggregation of platelets?
What is one of the materials required for the bleeding time test using Ivys’s Method?
What is one of the materials required for the bleeding time test using Ivys’s Method?
During the bleeding time test, what role does the number of platelets play?
During the bleeding time test, what role does the number of platelets play?
What result would indicate a potential bleeding disorder during the bleeding time test?
What result would indicate a potential bleeding disorder during the bleeding time test?
What is the main purpose of applying a blood pressure cuff during Ivys’s Method?
What is the main purpose of applying a blood pressure cuff during Ivys’s Method?
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Study Notes
Platelets
- Platelets are small cell fragments derived from megakaryocytes in bone marrow.
- They play a crucial role in hemostasis (stopping bleeding).
- Hemostasis involves three stages: adhesion, activation, and aggregation.
- Platelets help maintain vascular integrity by sealing defects in blood vessel walls.
- They create a platelet plug (adhesion and aggregation) to initially stop bleeding.
- Platelets contribute to fibrin formation, stabilizing the platelet plug and forming a clot.
Bleeding Time Test (BT)
- BT measures the time it takes for bleeding to stop after a small skin incision.
- It assesses platelet function and capillary integrity.
- The test evaluates platelet count, platelet function, blood vessel wall integrity, and efficiency of tissue fluid in accelerating coagulation.
Methods of BT
-
Ivy's Method:
- Uses a sphygmomanometer to maintain constant pressure at 40 mmHg.
- Involves standardized incision depth and length using an automated lancet.
- Normal range: 3-7 minutes.
-
Duke's Method:
- Uses a disposable lancet to make a deep puncture on the fingertip.
- Normal range: up to 6 minutes.
Interpretation of BT Results
- Prolonged Bleeding Time:
- Thrombocytopenia: low platelet count.
- Platelet Dysfunction Syndromes: impaired platelet function.
- Von Willebrand Factor Deficiency: deficiency in a clotting factor.
- Vascular Defects: abnormalities in blood vessel walls.
- Disseminated Intravascular Coagulation (DIC): widespread clotting in small blood vessels.
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