The prothrombin time a. assess the extrinsic pathway of the blood coagulation cascade b. is prolonged in patients with fat absorption c. is increased by warfarin d. is increased by heparin

The prothrombin time
a. assess the extrinsic pathway of the blood coagulation
cascade
b. is prolonged in patients with fat absorption
c. is increased by warfarin
d. is increased by heparin
by

1 Answer

Answer :

assess the extrinsic pathway of the blood coagulation
cascade
by

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The prothrombin time a. assess the extrinsic pathway of the blood coagulation cascade b. is prolonged in patients with fat absorption c. is increased by warfarin d. all above

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Assertion `:` Prothrombinase enzyme act as antiheparin Reason `:` Heparin prevent coagulation of blood in Blood vessels

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Hemostasis and the cessation of bleeding require which of the following processes? A. Adherence of platelets to exposed subendothelial glycoproteins and collagen with subsequent aggregation of platelets and formation of a hemostatic plug. B. Interaction of tissue factor with factor VII circulating in the plasma. C. The production of thrombin via the coagulation cascade with conversion of fibrinogen to fibrin. D. Cross-linking of fibrin by factor XIII.

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Patient on anti-coagulant therapy requires an extraction to be performed. Which of the following is NOT true: A. Minor post operative bleedings can be reduced somehow by using tranexamic acid B. Prothrombin value (INR) of 3 is enough to perform extraction C. It takes at least 8 hours for heparin to take effects D. Heparin should be administered sub-cutaneous

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Prothrombin time is prolonged by administering (A) Vitamin K (B) Dicoumarol (C) Calcium (D) Prothrombin

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Prothrombin time is prolonged in (A) Vitamin K deficiency (B) Liver damage (C) Both (A) and (B) (D) None of these

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Prothrombin time remains prolonged even after parenterals administration of vitamin K in (A) Haemolytic jaundice (B) Liver damage (C) Biliary obstruction (D) Steatorrhoea

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All of the following medications should not be used routinely in pregnant patients during the third trimester except (a) Acetaminophen (b) Nonsteroidal anti-inflammatory drugs (c) Warfarin (d) Lithium (e) Aspirin

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Laboratory monitoring of coagulation and anticoagulation includes testing of platelet function. Which of the following statements is/are true concerning tests of platelet function? a. A platelet count of 50,000/µL or more usually ensures hemostasis b. Bleeding time assays assessibility of platelets to perform hemostatic plugs and is determined from a sample of blood drawn in an EDTA coated test tube c. Aspirin therapy can be associated with a bleeding time in the range of 8–15 minutes d. Tests of platelet aggregation should be part of the standard preoperative evaluation of patients using aspirin

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Extrinsic (OH) absorption peaks define three regions or windows of preferred operation. List the three windows of operation.

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Heparin therapy is usually considered therapeutic when the patient’s activated partial thromboplasin time (aPTT) is how many times normal? a) 1.5 to 2 The amount of heparin administered is based on aPTT results, which should be obtained in follow-up to any alteration of dosage. b) .5 to 1 The patient’s aPTT value would have to be greater than .5 to 1 times normal to be considered therapeutic. c) 2.5 to 3 An aPTT value that is 2.5 to 3 times normal would be too high to be considered therapeutic. d) .25 to .75 The patient’s aPTT value would have to be greater than .25 to .75 times normal to be considered therapeutic.

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Which of the following statement(s) is/are true concerning heparin-associated thrombocytopenia? a. Heparin-associated thrombocytopenia occurs only in the face of over anticoagulation with heparin b. Severe thrombocytopenia (platelet count less than 100,000) is seen in less than 10% of patients treated with heparin c. Heparin-associated thrombocytopenia is due to the aggregation of platelets and may result in thrombosis or embolic episodes d. Heparin-associated thrombocytopenia may be seen within hours of initiation of heparin therapy

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Heparin is contraindicated in patients suffering from the following diseases except: A. Pulmonary tuberculosis B. Bleeding due to defibrination syndrome C. Subacute bacterial endoc

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Low dose subcutaneous heparin therapy is indicated for: A. Prevention of leg vein thrombosis in elderly patients undergoing abdominal surgery B. Ischaemic stroke C. Patients undergoing neurosurgery D. Prevention of extention of coronary artery thrombus in acute myocardial infarction

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Vitamin K is indicated for the treatment of bleeding occurring in patients: A. Being treated with heparin B. Being treated with streptokinase C. Of obstructive jaundice D. Of peptic ulcer

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Select the action of vasopressin exerted through the V1 subtype receptors: A. Release of coagulation factor VIII and von Willebrands factor from vascular endothelium B. Increased peristalsis of gut C. Dilatation of blood vessels D. Increased water permeability of renal collecting ducts

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The bright-flash ERG: a. comes only from the cones b. is generated in a fully dark adapted eye by the highest intensity of light c. can be used to assess the overall retinal integrity in the presence of media opacity d. is abnormal in patients with age-related macular degeneration

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A 55-year-old renal transplant patient has been hospitalized in a Surgical Intensive Care Unit, receiving a prolonged course of antibiotics following an attack of acute cholecystitis. The following statement(s) is/are true concerning his management. a. Due to the potential risk of Candida infection, prophylaxis with oral nystatin should be instituted early in the patient’s course b. A Candida urinary tract infection should be treated with systemic amphotericin B c. Changes of Candida retinitis are of little significance d. The presence of a virulent Candida bacteremia should suggest a dosage reduction in immunosuppressive agents until the infection can be adequately controlled

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Succinylcholine can produce all except A) Induce malignant hyperthermia in susceptible patients B) Prolonged paralysis occurs in case of butyrylcholinesterase abnormalities (as succinylcholine is not metabolized) C) Tachycardia, particularly in children D) Increase intraocular pressure

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Glucose overload results in increased CO 2 production. Which of the following statements are true? A. In patients with respiratory insufficiency, administration of glucose as a principal calorie source is contraindicated. B. In patients with pulmonary infection and sepsis, calorie support should consist of 95% fat and 5% glucose. C. In Askanazi's study, increased CO 2 production and difficulty in weaning was associated only with pronounced overfeeding. D. CO 2 production should be measured in most patients who are supported by respirators in intensive care units and are receiving nutritional support.

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