Titrated initiation of acetylsalicylic acid-dipyridamole therapy reduces adverse effects and improves tolerance in patients with stroke.

BACKGROUND: Standard aspirin (acetylsalicylic acid [ASA])-dipyridamole therapy twice daily is associated with high rates of discontinuation in large part because of headache and gastrointestinal side effects. Attempts to address dipyridamole-induced headache through reduced dose initiation have produced variable results. Moreover, it has been suggested that migraineurs are more likely to have a dipyridamole-induced headache. OBJECTIVE: We sought to evaluate whether titrated initiation of ASA-dipyridamole in patients with stroke/transient ischemic attack (TIA) improves tolerance and to assess the appearance of headache in those with pre-existing history of headaches. METHODS: ASA-dipyridamole (25/200 mg) once daily together with ASA (81 mg) daily was started in 130 patients given the diagnosis of stroke/TIA with instructions to increase ASA-dipyridamole to twice daily after 7 days and discontinue ASA (81 mg). Patients received a telephone call on days 7 and 14 to assess for adverse events, discontinuation, and recurrent stroke/TIA. RESULTS: Two patients were lost to follow-up. After 2 weeks, 113 patients were using the medication without any major complications. Fifteen patients were off therapy; 10 (8%) patients stopped because of headache and/or gastrointestinal symptoms, whereas 4 patients were switched to other antiplatelet agents by their primary care physician as a matter of choice rather than ASA-dipyridamole side effects. One patient had recurrent stroke because of intracranial dissection and was switched to anticoagulation. Only 4 of 27 (14%) patients with a history of headache discontinued therapy. CONCLUSIONS: Titrated initiation of ASA-dipyridamole (25/200 mg) appears to have low discontinuation rate and approximately 90% tolerance after 2 weeks. History of migraine or tension headaches was not directly associated with discontinuation because of headaches.

Thrombus detection by echocardiography in patients with acute ischemic stroke and chronic or new-onset atrial fibrillation.

INTRODUCTION: Recent articles have promoted anticoagulation for potential sources of embolism detected on echocardiography, despite lack of data regarding risk/benefit ratio for anticoagulating many of these abnormalities. Conversely, we have found echocardiography use in ambulatory stroke care to be of low yield. However, direct visualization of a thrombus might be considered a reasonable indication for anticoagulation. The current study assesses the use of transthoracic echocardiography (TTE) in thrombus detection in atrial fibrillation (AF) associated with acute stroke, which should present a good substrate for thrombus detection. METHODS: We conducted a chart review of patients admitted to our stroke department during a 6-month period, identifying and analyzing those with associated AF who were also submitted to TTE. RESULTS: In all, 31 patients with AF (12 chronic and 19 new onset) were studied. TTE was conducted within approximately 60 +/- 41 hours. Thrombus was detected in only one patient with severe left ventricular dysfunction. Moderate to severe left ventricular function was detected in two additional patients with history of myocardial infarction. There were no other pertinent findings in 28 of 31 patients. All patients were anticoagulated on the basis of AF detection. Two died in hospital from stroke-related complications and 26 of 31 were discharged home or to rehabilitation. CONCLUSIONS: TTE has a low yield of thrombus detection in patients with acute cardioembolic (AF-associated) stroke and has no impact on antithrombotic therapy in this patient population.

Serial electrocardiographic assessments significantly improve detection of atrial fibrillation 2.6-fold in patients with acute stroke.

BACKGROUND AND PURPOSE: Previous studies have reported a low, approximately 1% to 3%, rate of detection of occult atrial fibrillation (AF) with Holter monitor in patients with acute stroke. Furthermore, at least one study has reported that Holter monitoring could not always corroborate initial electrocardiographic (ECG) detection of AF suggesting underestimation of AF by Holter. We compare the detection of new-onset AF by serial ECG assessments and Holter after acute ischemic stroke. METHODS: One hundred forty-four patients with ischemic stroke admitted to a stroke unit were studied. The number of ECGs conducted within the first 3 days up to the detection of AF as well as the time interval for Holter "hookup" and subsequent reporting of AF was documented. RESULTS: ECGs were performed in 143 patients with a baseline of 10 (7%) patients having a history of AF. Serial ECGs detected 15 new AF cases in <2 days of admission, thereby increasing the total number of known AF cases to 25 (17.5%), a 2.6-fold increased realization of AF (P=0.011). Holter was also completed in 12 of 15 new cases of AF but surprisingly identified AF in only 50% (6 of 12). Holter monitoring was performed in 126 cases and in this subgroup, there was no statistically significant difference in the rate of AF detection with ECG or Holter. CONCLUSIONS: Serial ECG assessments within the first 72 hours of an acute stroke significantly improve detection of AF. The discordance regarding the corroboration of AF by Holter in ECG-positive patients with AF supports previous observations and suggests a high incidence of paroxysmal AF as a cause of ischemic stroke.

Usefulness of cardiovascular investigations in stroke management: clinical relevance and economic implications.

BACKGROUND AND PURPOSE: There are no prospective randomized studies assessing the clinical relevance of routine cardiovascular investigations in stroke patients. The objective of this study was to evaluate the utilization, relevance, and economics of cardiovascular investigations in an ambulatory stroke clinic. METHODS: The outcome of cardiovascular investigations in 200 patients with stroke/transient ischemic attack diagnosed in a stroke prevention clinic was assessed. Transthoracic echocardiography (TTE) was assessed for detection of thrombus or mass, poor left ventricle function, and other structural abnormalities. ECG and Holter monitor were felt to be relevant if they showed atrial fibrillation/flutter. Investigations were deemed to be clinically pertinent if they brought about a shift treatment paradigm. RESULTS: TTE and Holter were performed in >70% of cases and accounted for approximately 94% of total cardiovascular cost. Relevant TTE findings were identified in 6 (4%) patients, which did not alter antithrombotic therapy. Only 2 new cases of atrial fibrillation were identified by both ECG and Holter. CONCLUSIONS: TTE and Holter appear to be costly low-yield procedures in this clinical setting. Prospective analyses may help to provide cost effective criteria for selection of appropriate cardiovascular studies in stroke management.

Saving costs using an ounce of prevention: introduction of a regional stroke prevention clinic.

Trillium Health Centre (THC) is one of Canada's largest community hospitals and a regional provider of tertiary-level cardiac, neuroscience, and orthopedic care. In 2001, it was named one of nine Regional Stroke Centres in Ontario, with a mandate to coordinate stroke services across the continuum of care in keeping with best practices in the west Greater Toronto Area (GTA). Within its role as a Regional Stroke Centre, THC has successfully implemented an innovative approach to the delivery of stroke prevention services in its regional catchment area. Building on best practices, it has introduced a specialized and interdisciplinary team to provide timely and effective primary and secondary prevention services. The rapid growth in utilization to more than 2000 patients in the last fiscal year (2004-2005), suggests that the clinic is meeting a real need in the community for stroke prevention services. Many of these patients now benefit from appropriate medical management, stroke awareness education, lifestyle counselling, and expedited referrals to other specialists. The Regional Stroke Prevention Clinic (RSPC) may be the first step in preventing a stroke, thus avoiding the social costs to people with strokes and their families, and the financial burden on the health care system.

Best practices in stroke care.

In 2001, the Ontario Ministry of Health and Long-Term Care introduced the Ontario Stroke Strategy by designating regional stroke centres across the province. The primary role of these centres is to coordinate stroke care within the region and across the care continuum in keeping with best practices. Concurrently, Trillium Health Centre was identifying best practice projects to support its ongoing quest for excellence. With Trillium designated as a regional stroke centre, acute ischemic stroke care was an obvious choice for a best practice project. The aim of the project was to improve access to care and quality of care for stroke patients from emergency through acute care to in-patient rehabilitation. The team chose the rapid cycle change methodology. This approach to quality improvement advocates the testing of a series of small changes (i.e., process improvement ideas) in tandem with measurements to assess the impact of the change to drive further process improvements. The project was deemed a success, resulting in significant improvements in the timeliness and quality of care.

Bringing innovation to stroke care: development of a comprehensive stroke unit.

Much work has been done in the past 10 years to research and document best practices in stroke care along the continuum of care. The challenge now for stroke care practitioners is to turn those best practices into reality in a clinical setting. In spite of a general understanding and acceptance of the benefits to the patient, an organization's culture and limited access to resources can frustrate our best efforts to introduce best practices at the bedside. Trillium Health Centre, a community hospital serving a diverse community of more than one million people, has turned best practice stroke care guidelines into reality by developing a 14-bed comprehensive stroke unit. This innovative approach to care uses specialized stroke teams, an interdisciplinary approach to care, and a single unit where the patient remains in the same bed throughout the acute and rehabilitation stages of care. Commitment to the new delivery model by formal leaders, informal leaders, and front-line staff and a supportive organizational structure contributed to an expedited and successful implementation. All changes were implemented without an increase in the overall resources assigned to the unit. Early results show that the average length of stay is shorter than the national standard and that provider and patient satisfaction have improved.