FIBRINOLYTICS OR THROMBOLYTICS & ANTIPLATELETS Flashcards
Drugs that cause lysis of clot (thrombus).
THROMBOLYTIC OR FIBRINOLYTIC DRUGS
THROMBOLYTIC OR FIBRINOLYTIC DRUGS
Given————– (rapid, inexpensive,
does not have the risk of—————— ).
intravenously (IV)-catheterization
THROMBOLYTIC OR FIBRINOLYTIC DRUGS
They can affect both ———– and—————-
thrombi; hemostatic thrombi and target
thromboemboli are broken down. They can not
differentiate between ————- of an unwanted
thrombus and that of a beneficial hemostatic
plug
normal- pathogenic-fibrin
Mechanism of action of THROMBOLYTIC OR FIBRINOLYTIC DRUGS:
• These drugs catalyses the conversion of
————— to—————– which causes
degradation of ——————.
• -Plasmin digests not only fibrin but also
—————– and —————& ———————so bleeding may
occur.
plasminogen- plasmin-fibrin-fibrinogen-factors V -VIII
THROMBOLYTIC OR FIBRINOLYTIC DRUGS
They must be administered as———- as
possible after onset of thrombosis or embolism
(since they become more—————–to lysis as
they age).
—————– local thrombi may occur as the clot
dissolves and causes ————- aggregation and
thrombosis.
resistant - early-Increased-increased
Anti dose that affect (decrease) plasminogen action ?
1-Tanexamic acid
2-aminocaproic acid
—————-and——- affect (increase) directly on plasminogen ?
T-PA - Urokinase
——————(indirect) work by activate the proactivator
to become activator to activate plasminogen ?
الميكانزم الثانية هي الاساسيه لا تخربطي
خذي فكرة عن هذه
Streptokinase
Classification of fibrinolytics:
• Fibrin non selective (1st generation):
——————and———————
Streptokinase (SK) and urokinase (UK):
Classification of fibrinolytics:
• Fibrin non selective (1st generation):
• ————–acts indirectly forming a complex with
—————— which then activates free ——————-.
Also affects ———–and factors —————–and———-.
• - ————- expensive and most widely used. Antigenic(from β hemolyticus—————–).
• Has longer half life than ——————–
• Infused for ———-hour in the first 4 hours after infarction
• UK : ———— antigenic.
• - ————– activates plasminogen .
• -Both activate ————- as well as clot bound
plasminogen → —————-.
SK-plasminogen-plasminogen- fibrinogen-V and VII-Least-streptococci-alteplase-one -non-Directly-circulating- bleeding
Fibrin – selective ( 2nd generation ):(Expensive)
• Tissue plasminogen activator (tPA; —————-).
• Activate plasminogen that ———– to fibrin in a thrombus
only with————- affinity to free plasminogen, in contrast with SK which act on ——— plasminogen and produces a generalized ———— state.
• Superior to——— generation in dissolving old clots &
decreased bleeding tendency (clot ———).
• Of —————— efficacy to streptokinase.
• Has very short half life(———- min),given as ———– bolus then by ———- over one hour.
- ———–: similar and used as an
alternative to alteplase
————————-: A complex of streptokinase and
plasminogen. Considered as a———. Streptokinase is released and plasminogen is converted into plasmin
alteplase-bound- low-free-fibrinolytic- 1st-selective-equal
-5-IV-infusion-Reteplase- Anistreplase(anisoylated plasminogen streptokinase
activator complex)-prodrug
Fibrinolytics
Therapeutic uses:
• Acute myocardial infarction; most effective when
administered within 1st ————– hours
Benefits: ———— mortality, reduces area
of ———— , Early and sustained restoration of ————patency and myocardial blood ———-and preserves ————function.
• Massive ———— embolism.
• Acute peripheral —————.
• D—————-.
• Obstructed ————– and occlusion of
———— catheter.
• ————– has been associated with increased
bleeding risk in acute ————- when given
at a dose of ———— million units, and its use is not
recommended in this setting
6-Reduces-myocardial infarction-coronary -flow-ventricular-pulmonary-arterial occlusion-VT-arteriovenous shunt-intravascular
-Streptokinase-ischemic stroke-1.5
Fibrinolytics
Adverse effects
• 1- Bleeding (more with fibrin ————).
Treated by ———– infusion, fresh blood and
————– in sever cases(due to
increased level of circulating plasminogen which
may precipitate bleeding by dissolving hemostatic
plugs) .
• 2————– with streptokinase : rash,
fever, rarely anaphylaxis may occur.
• Fibrinolytic action may be neutralized by
—————- ———- that may be present in some
people who have had streptococcal infection,
thus start therapy with a————– to overcome AB and produce fibrinolytic effect
non specific stopping aminocaproic acid Hypersensitivity antistreptococcal AB loading dose
Fibrinolytics Contraindications: • ------------surgery(healing wounds), ------------------ bleeding and --------------- ulcer. • - ------------, metastatic cancer. • - ------------, -------------, old age. • History of cerebrovascular accidents
Recent -gastrointestinal-peptic-Hypertension
metastatic-Pregnancy-childern
ANTIPLATELET DRUGS (ANTITHROMBOTIC)
• Platelet aggregation:
• Platelets ————— to healthy endothelium, but if
a vessel wall is injured; the exposed collagen in
sub endothelium will result in platelet ————–,
followed by release reaction resulting in platelet
———————-.
• The released factors (—–,——–,——,——–,——–) bind to their receptors on
platelets resulting in exposure of a glycoprotein
complex (————–) on the platelet membrane,
which act as a receptor for ——————, regulate
platelet-platelet interaction and thrombus
formation.
•——— simultaneously binds to GP IIb/IIIa
receptors on two separate platelets resulting in
their cross linking and —————.
do not stick-adhesion-aggregation-ADP, TXA2, and serotonin(5HT),thrombin and PAF-(GP IIb/IIIa)-fibrinogen
- Fibrinogen-aggregation
