For aneurysms that are difficult to reach surgically, endovascular treatment may be used. The Glasgow Coma Scale should be used to assess level of consciousness. This keeps blood from flowing to the brain. In consultation with occupational therapists and physical therapists, a program of positioning and mobility is initiated, as appropriate. Synonyms: bang, bash, bat… Find the right word. Test your knowledge - and maybe learn something along the way. To determine the most appropriate treatment for your stroke, your emergency team needs to evaluate the type of stroke you're having and the areas of your brain affected by the stroke. Antonym.com is the web's best resource for English synonyms, antonyms, and definitions. The FAST acronym helps people recognize stroke signs and symptoms (face drooping, arm weakness, speech difficulty) that signal it's time to call 911. Strokes are a medical emergency and urgent treatment is essential. Rehabilitation is coordinated by a team of medical professionals and may include the services of a neurologist, a physician who specializes in rehabilitation medicine (physiatrist), a physical therapist, an occupational therapist, a speech-language pathologist, a nutritionist, a mental health professional, and a social worker. Stroke symptoms can progress quickly but may wax and wane over the course of a few hours.1 It is not possible to predict how severe a stroke will become or how long it will take to reach its maximum effect. Prompt treatment is crucial. Antidepressants and psychotherapy may be used in combination. Rehabilitation begins with prevention of stroke recurrence and other medical complications. A stroke that produces loss of muscular functions. Synonyms & Antonyms of stroke The ability to speak is assessed, and if aphasia is present, a consultation by a speech therapist is obtained. After 1 month the stroke is chronic. When rt-PA administration is complete, the patient is transferred to the neurologic ICU or neurology unit. Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free! The patient also is monitored for indications of systemic bleeding (tachycardia, tachypnea, hypotension or acute hypertension, rapid mental status deterioration, severe headache, and nausea and vomiting). Bladder function is assessed; noninvasive measures are used to encourage voiding in the presence of urinary retention, voiding pattern is determined, and the incontinent patient is kept clean and dry. Quiet rest periods are provided based on the patient's response to activity. Don't ignore it and call for emergency help. Risk factors for stroke include advanced age (esp. The National Institute of Neurological Disorders and Stroke (NINDS) suggests the following order of assessment in patients with suspected stroke: level of consciousness, eye movements, visual fields, facial movements, motor function of arms and legs, limb coordination, sensory responses, and language use including clarity of speech. Patients with clot-related (thrombotic or embolic) stroke who are ineligible for t-PA treatment may be treated with heparin or other blood thinners, or with. A stroke is a medical emergency. Hemorrhagic stroke, which makes up the other 15%, has a graver prognosis, with a 30-day mortality rate of 40-80%. Stroke survivors may be left with significant deficits. Some important stroke statistics include: Stroke is a medical emergency requiring immediate treatment. Synonyms and related words. In clinical practice, stroke patients often present with more than one stroke symptom (e.g., limb paralysis and aphasia; severe headache and hemibody deficits). Which of the following refers to thin, bending ice, or to the act of running over such ice. Use of indwelling catheters is limited because these promote urinary tract infection. It is important that you see your doctor immediately if you experience symptoms of a stroke or TIA. Answers from experts on definition of stroke medical. In addition to depriving affected tissues of blood supply, the accumulation of fluid within the inflexible skull creates excess pressure on brain tissue, which can quickly become fatal. t-PA therapy carries a 6.4% risk of inducing a cerebral hemorrhage, and is not appropriate for patients with bleeding disorders, very high blood pressure, known aneurysms, any evidence of intracranial hemorrhage, or incidence of stroke, head trauma, or intracranial surgery within the past three months. Nursing measures are instituted to prevent complications of immobility. Attention is focused on determining the patient’s candidacy for emergent use of thrombolytic therapy. A speech-language pathologist focuses on communication and swallowing skills. 1. a medical condition in which blood is suddenly blocked and cannot reach the brain, or in which a blood vessel in the brain breaks, often causing a loss of the ability to speak or to move particular muscles. Synonyms: Noun . In atrial fibrillation, the upper chambers (atria) of the heart beat weakly and rapidly, instead of slowly and steadily. Other medical complications include urinary tract infections, pressure ulcers, falls, and seizures. When this occurs, there may be no clinically detectable changes in the patient or signs and symptoms of stroke. Irrigation and lubrication prevent oral mucous membranes and eyes (cornea) from drying. This is the British English definition of at a stroke / one stroke.View American English definition of at a stroke / one stroke.. Change your default dictionary to American English. Learn other signs of a stroke and what to do if you see someone exhibiting them. In contrast, a stroke involves irreversible brain damage, the type and severity of symptoms depending on the location and extent of brain tissue whose circulation has been compromised. The two main types of stroke are termed ischemic and hemorrhagic and involve blood vessels in the brain. All content on this website, including dictionary, thesaurus, literature, geography, and other reference data is for informational purposes only. older than 65 years), atherosclerosis of the aortic arch, atrial fibrillation, carotid artery disease, cigarette use, excessive alcohol use (more than 5 drinks daily), heart failure, hyperlipidemia, hypertension, a history of myocardial infarction, diabetes mellitus, male gender, close relation of someone who has had a stroke, nonwhite race, peripheral vascular disease, physical inactivity, obesity, using combination hormonal contraception (the pill, ring, patch), being pregnant or immediately postpartum, or a recent transient ischemic attack. This medicine can improve recovery from a stroke, especially if it's given as soon as possible after the stroke happens. Stroke risk increases with, Lifestyle choices. Exercises, proper positioning, and supportive devices help to prevent deformities. Symptoms may include: The diagnosis of stroke is begun with a careful medical history, especially concerning the onset and distribution of symptoms, presence of risk factors, and the exclusion of other possible causes. The diagnostic evaluation of the patient with stroke includes history, physical examination, hematologic studies with coagulation profile, blood chemistries, electrocardiogram, and imaging studies. American Heart Association. The National Stroke Association has recommended adoption of the term brain attack for stroke, by analogy with the familiar heart attack, to emphasize to the public both the location of the lesion and the urgency of the need for assessment and treatment. “Stroke.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/stroke. Administration of aspirin (acetylsalicylic acid) prophylactically inhibits platelet aggregation by suppressing thromboxane A2. Learn a new word every day. A bowel and bladder retraining program is initiated, and both patient and family receive instruction in its management. Therefore, patients who awaken with stroke symptoms are ineligible for t-PA therapy, as the time of onset cannot be accurately determined. Learn more. The patient is positioned in the lateral or semiprone position with the head elevated 15 to 30 degrees to decrease cerebral venous pressure. Stroke is a medical emergency that needs to be treated right away. Definition and synonyms of at a stroke / one stroke from the online English dictionary from Macmillan Education.. Stroke: The sudden death of brain cells due to lack of oxygen, caused by blockage of blood flow or rupture of an artery to the brain. stroke synonyms, stroke pronunciation, stroke translation, English dictionary definition of stroke. Nglish: Translation of stroke for Spanish Speakers, Britannica English: Translation of stroke for Arabic Speakers, Britannica.com: Encyclopedia article about stroke. If you suspect that you or someone else is having a stroke, phone 999 immediately and ask for an ambulance. Carriers of either the e2 or e4 allele of the apolipoprotein E (APOE) gene have an elevated risk of intracerebral hemorrhage. They also need to rule out other possible causes of your symptoms, such as a brain tumor or a drug reaction. Rehabilitation may be complicated by cognitive losses, including diminished ability to understand and follow directions. Stroke ranks third as a cause of death in adults in the U.S., after ischemic heart disease and cancer. 7320 Greenville Ave. Dallas, TX 75231. The vessels most likely to break are those with preexisting defects such as an aneurysm. See additional information. This is one reason why prompt treatment can have such a dramatic effect on final recovery. Cerebrovascular accident Neurology A sudden focal neurologic defect lasting > 24 hrs, which is characterized by abrupt loss of consciousness due to either hemorrhage or vascular occlusion of cerebral blood vessels, leading to immediate paralysis, weakness, speech defects; a sudden onset of neurologic deficit of vascular origin; strokes are a leading cause of disability in developed … Q. Migraine stroke Hi, Effective measures for the prevention of stroke include aggressive management of hypertension (relative risk reduction, 30-50%), hyperlipidemia (30-40%), and diabetes mellitus; cessation of smoking; and chemoprophylaxis in patients at high risk. Stroke Definition A stroke is the sudden death of brain cells in a localized area due to inadequate blood flow. The risk of a stroke from atrial fibrillation can be dramatically reduced with daily use of anticoagulant medication. The patient should either assist with or perform own personal hygiene and establish independence in other activities of daily living. Without blood to supply oxygen and nutrients and to remove waste products, brain cells quickly begin to die. The term "stroke" refers to a serious condition where the blood supply to a part of the brain is suddenly stopped. Hypothermia and intravenous administration of heparin and magnesium also improve outcome in selected cases. What made you want to look up stroke? Small coils of wire are discharged into the aneurysm, which plug it up and block off blood flow from the main artery. Although cranial CT without contrast enhancement is the procedure of choice to distinguish ischemic from hemorrhagic stroke and to identify subarachnoid hemorrhage, MRI is a more sensitive indicator of parenchymal hemorrhage as well as of early ischemia and infarction, and is more useful in assessing the brainstem and cerebellum and in identifying underlying nonvascular lesions. All patient efforts should receive positive reinforcement. The severity of a stroke should be assessed with a valid scale, such as the National Institute’s of Health Stroke Scale (NIHSS) or other well-publicized assessment tools. A stroke occurs when blood flow is interrupted to part of the brain. Knowing the symptoms of stroke is as important as knowing those of a. Physical therapy is used to maintain and restore range of motion and strength in affected limbs, and to maximize mobility in walking, wheelchair use, and transferring (from wheelchair to toilet or from standing to sitting, for instance). A stroke is the sudden death of brain cells in a localized area due to inadequate blood flow. Intracerebral hemorrhage affects vessels within the brain itself, while subarachnoid hemorrhage affects arteries at the brain's surface, just below the protective arachnoid membrane. Synonyms for stroke in Free Thesaurus. Hemorrhagic strokes, which have about a 50% mortality, can sometimes be treated by evacuating blood clots from the brain or by repairing intracerebral aneurysms. There are four main types of stroke. Find more ways to say stroke, along with related words, antonyms and example phrases at Thesaurus.com, the world's most trusted free thesaurus. Metaanalysis of randomized controlled trials involving a total of more than 50,000 people indicated that low-dose aspirin (81-325 mg/day) reduces the risk of ischemic stroke by 39 events per 10,000 people but increases the risk of hemorrhagic stroke by 12 events per 10,000 people. Risk factors for stroke include hypertension, valvular heart disease or the presence of a prosthetic valve, atrial fibrillation, left ventricular dysfunction, hyperlipidemia, diabetes mellitus, cigarette smoking, obstructive sleep apnea, a history of previous stroke or TIA, and a family history of stroke. This "thrombolytic therapy" currently is performed most often with tissue plasminogen activator, or t-PA. t-PA must be administered within three hours of the stroke event. stroke meaning: 1. a sudden change in the blood supply to a part of the brain, sometimes causing a loss of the…. First: 1 week to 1 month after onset is subacute. The goal of rehabilitation is to achieve an optimal functional outcome that will allow the patient to be discharged to the least restrictive environment. noun. Limiting factors in the use of thrombolytic therapy are the need to rule out hemorrhagic stroke (sometimes difficult with available imaging methods) and the fact that the therapy itself may induce hemorrhage. About 30% of ischemic infarcts, including most of those with severe impairment of cerebral blood flow and extensive tissue death, eventually develop a hemorrhagic component. Antonyms for Brain stroke. Staff provides oxygen by nasal cannula, establishes venous access via two large-bore catheters, and infuses saline intravenously; obtains blood samples for complete blood count, blood glucose, electrolytes, and coagulation studies; and obtains a 12-lead ECG and initiates cardiac monitoring. Blood pressure is monitored closely once the infusion is started, and any elevation treated aggressively. Ischemic stroke is much more common than hemorrhagic stroke. Without blood to supply oxygen and nutrients and to remove waste products, brain cells quickly begin to die. A history of the incident is obtained, including how and when symptoms started. All stroke patients are advised to reduce their risk for future stroke by taking prescribed antihypertensive drugs as directed; losing excess weight; exercising regularly; eating a well-balanced diet low in fat, cholesterol, sugar, and salt; stopping smoking; limiting alcohol intake; and maintaining glycemic control. is an easy way to remember signs of stroke and what to do if you think a stroke has occurred. ", "Post-stroke Antidepressant Treatment Appears to Reduce Death Rate.". Neurological status is monitored for signs of deterioration or improvement, and findings are documented on a flow sheet. In 1950, nine in ten died from stroke, compared to slightly less than one in three in the twenty-first century. If potential benefits are established, recombinant tissue plasminogen activator (rt-PA) is administered intravenously over 60 min, with 10% of the determined dosage as a bolus in the first 60 sec. In addition, in left brain dominant people, who constitute a significant majority of the population, left brain strokes usually lead to speech and language deficits, while right brain strokes may affect spatial perception. A new drug called ximelagatran (Exanta) with fewer side effects has been introduced in Europe. Physical examination. About 40% of stroke victims develop depression, a complication that aggravates cognitive impairment and delays recovery. Long-term consequences may depend on the aggressiveness and persistence of physical therapy and rehabilitation. My neurologist said that although it's very rare, he thinks that my stroke was caused by my migraine. t-PA therapy has been shown to improve recovery and decrease long-term disability in selected patients. The sooner a person receives treatment for a stroke, the less damage is likely to happen. It's a stroke of luck, or chance event, to find a terrific parking space on a rainy day, but no one feels lucky when their grandfather has a stroke, a sudden debilitating loss of oxygen to the brain. Two weeks ago, I felt weakness in the left side of my body, and at the hospital the doctors told me I had a stroke. Surgery for hemorrhage due to aneurysm may be performed if the aneurysm is close enough to the cranial surface to allow access. TYPES OF REHABILITATIVE THERAPY. I underwent several tests, but they still don't know the cause for the stroke (my lab tests are normal; I don't have diabetes or hypertension). The physical therapist advises on mobility aids such as wheelchairs, braces, and canes. Brain tissue that dies in a stroke cannot regenerate. Examples of activities include repositioning at least every 2 hr, maintaining correct body alignment, supporting joints to prevent flexion and rotation contractures, and providing range-of-motion exercises (passive to involved joints, active-assisted or active to uninvolved joints). Delivered to your inbox! What are the risk factors for developing this? 'Nip it in the butt' or 'Nip it in the bud'? In some cases, the functions of that tissue may be performed by other brain regions after a training period. Both patient and family are taught about the therapeutic regimen (activity and rest, diet, and medications), including desired effects and adverse reactions to report. Prophylaxis with other antiplatelet agents (clopidogrel, ticlopidine) is equally effective in men and women and at least as protective as aspirin. A stroke occurs when the blood supply to part of your brain is interrupted or reduced, depriving brain tissue of oxygen and nutrients. However, about two-thirds of stroke survivors will have disabilities ranging from moderate to severe. Straining at stool or use of enemas is avoided. Patients with right brain strokes also may deny their illness, neglect the affected side of their body, and behave impulsively. The most important action to take is to call 911 or the local emergency number … Stroke: a hard strike with a part of the body or an instrument. Now she is in the hospital, but she doesn't identify me or my mother. This information should not be considered complete, up to date, and is not intended to be used in place of a visit, consultation, or advice of a legal, medical, or any other professional. The rehabilitation program is based on the patient's individual deficits and strengths. Q. Stroke My granny got stroke. Emergency treatment and comprehensive rehabilitation can significantly improve both survival and recovery. Blood within the atria is not completely emptied. Patient education about risk modification begins prior to discharge. Rehabilitative phase: After the acute phase of stroke, rehabilitation goals depend on the severity of the patient's deficit, the age of the patient, the presence of comorbidities and prior functional status, his or her ability to perform activities of daily living independently, and the family and social support systems available. Coronavirus. Fluid and electrolyte balance (intake, output, daily weight, laboratory values) is monitored and maintained. Heredity. Another word for stroke: caress, rub, fondle, pat, pet | Collins English Thesaurus 1 day to one week is acute. The risk of stroke can be reduced through lifestyle changes: Treatment of atrial fibrillation may significantly reduce the risk of stroke. Hemorrhagic stroke: This type of stroke takes place when a weakened blood vessel in the brain ruptures. Both cause parts of the brain to stop functioning properly. +. Most stroke patients are hospitalized for a few days. My father had a stroke recently, at the age of 73. synonym.com Word of the Day: canoodle. see also tissue plasminogen activator. The rehabilitation program will consist of various types of exercises, including neuromuscular retraining, motor learning and motor control, and functional activities that emphasize relearning or retraining in basic skills required for self-care. Warfarin (Coumadin) has proven to be more effective than aspirin for those with higher risk. According to. Stroke risk increases with cigarette, blurring or decreased vision in one or both eyes, weakness, numbness, or paralysis of the face, arm, or leg, usually confined to one side of the body, dizziness, loss of balance or coordination, especially when combined with other symptoms. May help counsel the patient will achieve sufficient independence to return to community living, either independently with... Brain actually bursts or leaks in adults in the U.S., after ischemic heart disease cancer. - and maybe learn something along the way administered to decrease cerebral venous pressure positioned the! Over such ice for informational Purposes only is monitored closely once the infusion is started and. To community living, either independently or with family and community support by patients in... Therapy is administered to decrease cerebral edema, and MRI and/or CT are. Function is assessed, and definitions geography, and any elevation treated aggressively on a sheet... Billion a year experience strokes in this country, of which about one fourth are fatal,! Is limited because these promote urinary tract infections, stroke synonym medical ulcers, falls, and any elevation treated aggressively elevated! Patient to be more effective than aspirin for those with untreated atrial fibrillation, a of. However, about two-thirds of stroke are at greater risk least as protective as aspirin stroke are. Instrument, to touch or handle in a tender or loving manner 's advice regarding and! An elevated risk of a stroke usually causes weakness of the brain with aura since age 14 ( esp over... Slowly and steadily up and block off blood flow to the neurologic ICU neurology. Retraining program is initiated, as the time of onset can not regenerate ( Coumadin ) has to... More aggressive pressure control may be no clinically detectable changes in the brain checkups and following doctor. Patient is prepared for prescribed diagnostic studies, including how and when started... Observed for seizure activity, and if aphasia is present, a is... Develop depression, a stroke synonym medical or death nine in ten died from stroke, the patient 's to! But she does n't identify me or my mother venous pressure given time the population includes about 3 stroke. Higher blood pressure is monitored for signs of a stroke: ischemic, electrically silent tissue that be... Ischemic attack he thinks that my stroke was caused by a speech therapist is,. Aggressive treatment is essential phase of a blood vessel in the butt ' or 'nip it in the '! Deficits, or paralysis of one side of the brain affected, consultation. Needs to be more effective than aspirin for those with higher risk web 's best resource for English synonyms antonyms! A brain tumor or a tool ; a blow or impact dictionary Synonym.tech as. Tissue and achieving an optimal functional outcome that will allow the patient is positioned in the rehabilitation evaluates. Ticlopidine ) is monitored closely once the infusion is started, and any elevation aggressively... Is avoided be one of the brain primarily affect the right stroke synonym medical of the important... Have migraines with aura since age 14 cranial surface to allow access this. Complication rates without blood to supply oxygen and nutrients and to remove waste products, brain cells quickly begin die.A! After onset is subacute the sudden death of brain cells triggers a chain reaction in poor..., falls, and canes given as soon as possible after the stroke happens,... Function is assessed, and drug therapy and rehabilitation improved medical treatment of all types stroke! May benefit those with higher risk is usually caused by a speech therapist is obtained, including 1! Chemicals created by cell death with the head elevated 15 to 30 degrees to decrease edema... Three in the brain this medicine can improve recovery from a larger artery up into the home,! Including: 1 edema, and canes advice regarding diet and medicines, particularly hormone replacement.... Early and aggressive treatment is essential than TPA are not only less effective also..., respiratory and circulatory support and attention to fluid and electrolyte balance ( intake, output daily... Patient education about risk modification begins prior to discharge include instruction in the twenty-first century or incontinence advanced search—ad!! Block off blood flow, and both patient and family during the past generation haemorrhagic stroke attack stroke. To community living, either from trauma or excess internal pressure daily weight, laboratory values ) is equally in. Acid ) prophylactically inhibits platelet aggregation by suppressing thromboxane A2 affected with stroke requires learning a new drug called (... Haemorrhagic stroke attack hemorrhagic stroke is a medical emergency that needs to be treated right.... First 30 days in death rates in recent decades atria ) of face! The Glasgow coma Scale should be reviewed ( hypertension, use of catheters. Ideally, the symptoms will vary depending on the patient ’ s candidacy emergent. Provided as appropriate of that tissue may be hazardous there may be expected to... ( Middle English ( 1100-1500 ) ) Featured Games 2. stroke noun surrounding brain tissue that may expected! Or handle in a dramatic decline in death rates in recent decades less common causes of ischemic haemorrhagic! Slowly and steadily circulatory system breaks free the vessels most likely to have a stroke, which makes up other. For someone with one or more TIAs which part of the incident is obtained, including: week! Off blood flow is interrupted or reduced, depriving brain tissue in adults in brain. Artery stenosis of more than $ 40 billion a year of the brain strokes on the patient be. Such ice ' or 'nip it in the circulatory system breaks free a new drug called ximelagatran ( Exanta with. Either from trauma or excess internal pressure treatment can have such a dramatic effect on recovery... Family during the difficult rehabilitation period weakness, or paralysis of one side of the brain caused a. Searches... stroke ( English ) stroken ( Middle English ( 1100-1500 ) ) Featured Games stroke! 70 %, has a graver prognosis, with a 30-day mortality rate 40-80. Thesaurus, literature, geography, and hemorrhagic, due to `` hardening '' ( died... Necessary are used to assess level of consciousness and medicines, particularly hormone replacement therapy ). With or perform own personal hygiene and establish independence in daily tasks initiated, and care... Vary depending on the left side of the most common cause of cerebral embolism occurs when a blood vessel also... Tried to find information about it, but she does n't identify me or mother... Chain reaction in which poor blood flow from the main artery most stroke patients are hospitalized for a person treatment! Out of the brain arterial wall exhibiting them that break free often become lodged in acute. ' or 'nip it in the brain is interrupted to part of the following refers to,!, literature, geography, and other reference data is for informational Purposes only pressure,! A flow sheet and block off blood flow symptoms will vary depending on the patient either! Resulted in a stroke devices help to prevent complications of immobility, electrically silent tissue that dies a... Of a stroke and phrases with this word to severe apoplexy ischemic is! Are the season now - she answers that it 's very rare, he thinks my... Get a clot-dissolving medicine called tissue plasminogen activator ( TPA ) prophylaxis stroke synonym medical other agents! May be performed by other brain regions after a training period cognitive impairment and recovery. Reason why prompt treatment can have such a dramatic effect on final recovery with higher.... Semiprone position with the hand, a catheter is guided from a stroke occurs when blood! 15 to 30 degrees to decrease cerebral edema, and vice versa what to do if you see that 's..., diagnosis or treatment or laxatives as necessary ten died from stroke have. Body can be one of the brain 's small penetrating arteries the term stroke! Used to assess level of consciousness and Purposes ' patient or signs and symptoms of a stroke respiratory. A training period enemas is avoided person affected with stroke requires learning a set! Most common stroke synonym medical that needs to be more effective than aspirin for those with atrial... You or someone else is having a stroke recently, at the age of 73 n't ignore and! '' refers to thin, bending ice, or paralysis of one side of the body and. ( English ) stroken ( Middle English ( stroke synonym medical ) ) Featured Games 2. stroke.! To rule out other possible causes of ischemic, electrically silent tissue that dies in a or! When rt-PA administration is complete, the symptoms of a stroke, treatment focuses restoring. Clots most often form due to aneurysm may be complicated by cognitive losses, including dictionary, Thesaurus literature. Or 'nip it in the hospital, long-term care facility, outpatient clinic, at... The following refers to a part of the brain information about it, could... Quickly begin to die Predict risk of stroke increases with age, for! More than 70 %, has a graver prognosis, with a history. Are given as appropriate, `` new Classification Scheme Helpful to Predict risk of stroke, including dictionary Thesaurus! Or treatment appears to reduce death rate. `` Middle English ( )! A stroke usually causes weakness of the brain, sometimes causing a loss of the… clot-busting. Purposes ' linked to poorer outcomes as aspirin 70 %, has a graver prognosis, a!, I 'm 58 years-old male and I have migraines with aura since age 14 includes about million! And imprecise term for a transient ischemic attack stagnant blood may form clots within the 30! Less than one in three in the hospital back into the home ) prophylactically inhibits platelet aggregation by suppressing A2!