| ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
(Stroke. 2003;34:1699.)
© 2003 American Heart Association, Inc.
Original Contributions |
From the Department of Internal Medicine, St Josefs Hospital Cloppenburg (J.S., S.L., A.K.); Institute for Mathematics and Medical Statistics, University Hamburg-Eppendorf (J.B.); Department of Nephrology, Klinikum Benjamin Franklin, Freie Universität Berlin (W.Z.); Department of Neurology, Westpfalz Klinikum Kaiserslautern (J.T.); Department of Neurology, Charité, Humbold University Berlin (K.E.); Department of Neurology, University of Essen (H.C.D.); and Department of Pharmacology and Toxicology, University of Lübeck (P.D.), Germany.
Correspondence to Dr Joachim Schrader, St Josefs Hospital, Krankenhausstrasse 13, D-49661 Cloppenburg, Germany. E-mail j.schrader{at}kh-clp.de
| Abstract |
|---|
|
|
|---|
Methods Five hundred patients were recruited in a prospective, double-blind, placebo-controlled, randomized, multicenter phase II study.
Results This safety trial was stopped prematurely when 342 patients (339 valid) had been randomized because of an imbalance in end points. Demographic data, cardiovascular risk factors, and blood pressure on admission, on study onset, and within the whole study period were not significantly different between the 2 groups. However, the cumulative 12-month mortality and the number of vascular events differed significantly in favor of the candesartan cilexetil group (odds ratio, 0.475; 95% CI, 0.252 to 0.895). There were no significant differences in concomitant medication and in number or type of side effects.
Conclusions Although the mechanisms by which angiotensin type 1 (AT1) receptor blockade affects cardiovascular morbidity and mortality are still unresolved, the present study shows that early neurohumoral inhibition has similar beneficial effects in cerebral and in myocardial ischemia. The fact that no cardiovascular or cerebrovascular event occurred as a result of hypotension is of significant clinical importance. When there is need for or no contraindication against early antihypertensive therapy, candesartan cilexetil is a safe therapeutic option according to the ACCESS results.
Key Words: antihypertensive therapy benzimidazoles blood pressure stroke, acute
| Introduction |
|---|
|
|
|---|
Recent literature on antihypertensive treatment in coronary and renal vascular disease indicates an emerging conceptual shift from lowering blood pressure to specific organ-protective effects. Whereas numerous earlier studies confirmed a benefit of antihypertensive treatment per se, there is now increasing evidence indicating that inhibition of neurohumoral activation confers clinical benefit beyond the effects of blood pressure reduction.9 On the basis of these studies, angiotensin-converting enzyme (ACE) inhibition is well established not only in the long-term treatment but also in the early management of myocardial infarction.1012 Likewise, ACE inhibition and angiotensin type 1 (AT1) receptor blockade appear to be renoprotective independent of their hypotensive effects.13,14 Moreover, there is emerging evidence indicating that AT1 receptor blockade is also protective against stroke. The convincing data supporting the favorable effects of neurohumoral inhibition beyond any hemodynamic effects in renal and coronary vasculature provided a basis for studying the effects of AT1 receptor blockade in the setting of acute cerebral ischemia.
The Acute Candesartan Cilexetil Therapy in Stroke Survivors (ACCESS) study was designed to assess the safety of modest blood pressure reduction in the early treatment of stroke. The study was also designed to provide an estimate of the number of cases required to perform a larger phase III efficacy study.15 ACCESS is an investigator-initiated study with support by an unrestricted grant from ASTRA Zeneca, Germany.
| Subjects and Methods |
|---|
|
|
|---|
=0.05). The study was performed in agreement with the basic principles of the Declaration of Helsinki and after permission was given by the ethical committee of the State Medical Board of Lower Saxony and all local ethical committees. This was an investigator-initiated study.
Inclusion criteria were a motor deficit, a cerebral CT scan excluding intracranial hemorrhage, and the necessity to treat hypertension according to current recommendations.1 This was assumed when the mean of at least 2 blood pressure measurements was
200 mm Hg systolic and/or
110 mm Hg diastolic 6 to 24 hours after admission or
180 mm Hg systolic and/or
105 mm Hg diastolic 24 to 36 hours after admission.
Exclusion criteria were age >85 years, disorders in consciousness potentially preventing acquisition of consent, occlusion or >70% stenosis of the internal carotid artery, malignant hypertension, manifest cardiac failure (New York Heart Association class III and IV), high-grade aortic or mitral stenosis, unstable angina pectoris, or contraindications against candesartan cilexetil.
All patients received carotid ultrasound examination before randomization. The vital status of all patients was ascertained. All patients received a clinical examination on admission. A full neurological examination was performed with recording of neurological deficits and state of consciousness.
Further diagnostic measures included assessment by Rankin Scale and Barthel Index (BI) (on admission and discharge), ECG, echocardiography (optional), laboratory investigations, and tests according to clinical requirements.
The following laboratory values were determined before randomization and before discharge: electrolytes, creatinine, urea, aspartate aminotransferase, alanine aminotransferase, cholesterol, HDL cholesterol, LDL cholesterol, triglycerides, hemoglobin, platelet count, blood glucose, coagulation rate (prothrombin time, thrombin time, fibrinogen), and urinalysis (blood, glucose, protein, microalbuminuria) (once during stay in hospital). Creatinine and electrolytes were checked within the first 3 days of when the investigational medication was started again.
Blood Pressure Control
The target reduction in blood pressure was 10% to 15% within 24 hours. The reduction in blood pressure was taken as the mean value of 2 measurements within 30 minutes. In the first 3 days, occasional measurements of blood pressure were performed by nurses or automatically throughout the day at 1- to 2-hour intervals and during the night at 2- to 3-hour intervals. On day 7 an automatic 24-hour recording of blood pressure was performed.
Treatment Design
Treatment was started with 4 mg candesartan cilexetil daily or placebo on day 1. On day 2, dosage was increased to 8 or 16 mg candesartan cilexetil or placebo if blood pressure exceeded 160 mm Hg systolic or 100 mm Hg diastolic. Treatment was targeted to a 10% to 15% blood pressure reduction within 24 hours. When blood pressure was >230 mm Hg systolic or >115 mm Hg diastolic for >30 minutes on day 1 or 2 or on the following days >200 mm Hg systolic or >110 mm Hg diastolic for >30 minutes, an acute intervention (urapidil) was allowed.
In all patients a 24-hour blood pressure profile was obtained on day 7. In patients in the candesartan cilexetil group who showed a hypertensive profile (mean daytime blood pressure >135/85 mm Hg), candesartan cilexetil was increased or an additional antihypertensive drug (hydrochlorothiazide, felodipine, metoprolol) was added. In placebo-treated patients showing a hypertensive profile, candesartan cilexetil was started and was adjusted to lower blood pressure to <140/90 mm Hg (office blood pressure) or <135/85 mm Hg (mean daytime blood pressure, automatic blood pressure monitoring). Patients who showed a normotensive profile on placebo (n=2) did not receive antihypertensive medication. Follow-up examinations (blood pressure, neurological index/status, adverse events, medication) were performed after 3, 6, and 12 months (Figure 1).
|
Assessment of Outcomes
The primary end point was defined to include case fatality and disability, measured as functional status with the use of the BI16 3 months after the end of a placebo-controlled 7-day phase. Cerebral complications are hemorrhages, recurrent stroke, reduction in state of consciousness, and development of cerebral edema. Cardiac complications are any cardiovascular event (including myocardial infarction) and heart failure. BI was excluded post hoc for analysis of a combined end point because new data show that BI is not useful for assessing minor deficits at a high functional level. Because of its U-shaped distribution, the BI is an inappropriate outcome measure for this sample size.17 The combined secondary end point included overall mortality and cerebrovascular and cardiovascular events occurring within the study period. The secondary end point was assessed 12 months after hospital discharge. Terminating events for analysis were all "first events" after randomization. End points were confirmed by hospital discharge reports. All end points were evaluated during on-site monitoring by independent physicians who were familiar with stroke therapy.
Statistical Analysis
All statistical analyses were performed with the use of SPSS for windows. Quantitative variables were given as mean (SD). Nominal variables are tabulated as absolute and/or relative (percentage) frequencies. The frequency comparisons were made by Fisher exact tests. Odds ratios and 95% CIs were calculated according to the Mantel-Haenszel test. The mean comparisons were performed with the use of the Mann-Whitney U test. The cumulative event rates were presented as Kaplan-Meier curves and compared with the log-rank test.
The significance level was fixed at 5%. The primary question was to test whether the overall event rate was lower in the candesartan cilexetil group than in the placebo group. All other comparisons should be considered exploratory data analyses. Therefore, no adjustment for the error of the first kind (
=0.05) was applied.
| Results |
|---|
|
|
|---|
|
Demographic data, cardiovascular risk factors, and blood pressure on admission, on study onset, and within the whole study period were not significantly different between both groups (candesartan cilexetil versus placebo: age, 68.3 versus 67.8 years; male sex, 50% versus 52%; diabetes mellitus in 39% versus 35%; coronary heart disease in 22% versus 19%; hyperlipidemia in 43% versus 45%, respectively) (Table and Figure 3). The study was initiated on average 29.9 versus 29.7 hours after recognition of the symptoms.
|
|
No significant differences in blood pressure were evident between the groups on hospital admission (candesartan cilexetil versus placebo: 196/103 versus 199/102 mm Hg) and on study onset (candesartan cilexetil versus placebo: 188/99 versus 190/99 mm Hg). During the placebo-controlled phase in the first 7 days, blood pressure levels were similar in both groups. Likewise, in the subsequent 12 months of follow-up, no significant differences in blood pressure were apparent (Figure 3). In 164 of 166 patients in the placebo group, candesartan cilexetil was started on day 7 because of a hypertensive 24-hour blood pressure profile and was continued throughout the study.
The BI revealed no significant differences on day 0 and after 3 months (candesartan cilexetil versus placebo: day 0, 60.0 [SD 30.24] versus 64.1 [SD 27.53]; 3 months, 87.0 [SD 22.91] versus 88.9 [SD 88.9]).
In contrast, the cumulative 12-month mortality (candesartan cilexetil versus placebo: 5 [2.9%] versus 12 [7.2%]; P=0.07) and the number of vascular events (candesartan cilexetil versus placebo: 17 [9.8%] versus 31 [18.7%]; P=0.026) differed significantly in favor of the candesartan cilexetil group (candesartan cilexetil versus placebo: cardiovascular events, fatal [death] and nonfatal: 2 versus 10; cerebrovascular events, fatal [death] and nonfatal: 13 versus 19; noncardiovascular mortality: 1 versus 1; pulmonary embolism: 1 versus 1). The odds ratio was 0.475 (95% CI, 0.252 to 0.895). The cumulative event rates are plotted in Figure 4. There were no significant differences regarding the use of concomitant medication on hospital admission or during follow-up (in particular acetylsalicylic acid, ß-blockers, antihypertensive agents).
|
Drug tolerance and number or type of undesirable effects did not differ significantly between the 2 groups.
| Discussion |
|---|
|
|
|---|
The favorable effects of early AT1 receptor blockade are mainly due to a lower incidence of myocardial ischemic events. However, recurrent cerebral ischemic events did not significantly contribute to the differences in cardiovascular morbidity and mortality. How can the modulation of cerebrovascular remodeling then be linked with improved cardiovascular survival? Indeed, there are sound data providing a link between incidence of cardiac death and central autonomic nervous function. Impaired central autonomic regulation was shown to be associated with increased mortality from myocardial infarction.18 It is conceivable that early local angiotensin II effects may affect not only early but also long-term autonomic function. Such a link is further suggested from studies dealing with other organ systems. The beneficial effect of early ACE inhibition on survival after myocardial infarction lends support to the view that early vascular remodeling profoundly affects cardiovascular survival.19 The fact that the benefit did not arise immediately, but instead appeared to increase during follow-up, is analogous with data acquired from cardiac intervention studies involving lysis therapy or ACE inhibitors.20 Although the mechanisms by which AT1 receptor blockade affects cardiovascular morbidity and mortality are still unresolved, the present study shows that early neurohumoral inhibition has similar beneficial effects in cerebral and in myocardial ischemia.
The fact that no cardiovascular or cerebrovascular event occurred as a result of hypotension is of significant clinical importance. When there is need for or no contraindication against early antihypertensive therapy, candesartan cilexetil is a safe therapeutic option according to the ACCESS results.
| Appendix |
|---|
|
|
|---|
| Acknowledgments |
|---|
| Footnotes |
|---|
Received September 24, 2002; revision received December 12, 2002; accepted January 14, 2003.
| References |
|---|
|
|
|---|
This article has been cited by other articles:
![]() |
A. I. Qureshi Acute Hypertensive Response in Patients With Stroke: Pathophysiology and Management Circulation, July 8, 2008; 118(2): 176 - 187. [Full Text] [PDF] |
||||
![]() |
A. Covic, A. Schiller, N.-G. Mardare, L. Petrica, M. Petrica, A. Mihaescu, and N. Posta The impact of acute kidney injury on short-term survival in an Eastern European population with stroke Nephrol. Dial. Transplant., July 1, 2008; 23(7): 2228 - 2234. [Abstract] [Full Text] [PDF] |
||||
![]() |
H. K. Shin, M. Nishimura, P. B. Jones, H. Ay, D. A. Boas, M. A. Moskowitz, and C. Ayata Mild Induced Hypertension Improves Blood Flow and Oxygen Metabolism in Transient Focal Cerebral Ischemia Stroke, May 1, 2008; 39(5): 1548 - 1555. [Abstract] [Full Text] [PDF] |
||||
![]() |
G. Mancia and G. Grassi Editorial: The new European Society of Hypertension/European Society of Cardiology (ESH/ESC) Guidelines Therapeutic Advances in Cardiovascular Disease, February 1, 2008; 2(1): 5 - 12. [PDF] |
||||
![]() |
H. Ay, E. M. Arsava, W. J. Koroshetz, and A. G. Sorensen Middle Cerebral Artery Infarcts Encompassing the Insula Are More Prone to Growth Stroke, February 1, 2008; 39(2): 373 - 378. [Abstract] [Full Text] [PDF] |
||||
![]() |
K. Tsukuda, M. Mogi, J.-M. Li, J. Iwanami, L.-J. Min, A. Sakata, T. Fujita, M. Iwai, and M. Horiuchi Amelioration of Cognitive Impairment in the Type-2 Diabetic Mouse by the Angiotensin II Type-1 Receptor Blocker Candesartan Hypertension, December 1, 2007; 50(6): 1099 - 1105. [Abstract] [Full Text] [PDF] |
||||
![]() |
L. B. Goldstein Acute Ischemic Stroke Treatment in 2007 Circulation, September 25, 2007; 116(13): 1504 - 1514. [Full Text] [PDF] |
||||
![]() |
J.-G. Wang, Y. Li, S. S. Franklin, and M. Safar Prevention of Stroke and Myocardial Infarction by Amlodipine and Angiotensin Receptor Blockers: A Quantitative Overview Hypertension, July 1, 2007; 50(1): 181 - 188. [Abstract] [Full Text] [PDF] |
||||
![]() |
Authors/Task Force Members:, G. Mancia, G. De Backer, A. Dominiczak, R. Cifkova, R. Fagard, G. Germano, G. Grassi, A. M. Heagerty, S. E. Kjeldsen, et al. 2007 Guidelines for the Management of Arterial Hypertension: The Task Force for the Management of Arterial Hypertension of the European Society of Hypertension (ESH) and of the European Society of Cardiology (ESC) Eur. Heart J., June 11, 2007; (2007) ehm236v1. [Full Text] [PDF] |
||||
![]() |
P. E. Marik and J. Varon Hypertensive Crises: Challenges and Management Chest, June 1, 2007; 131(6): 1949 - 1962. [Abstract] [Full Text] [PDF] |
||||
![]() |
H. P. Adams Jr, G. del Zoppo, M. J. Alberts, D. L. Bhatt, L. Brass, A. Furlan, R. L. Grubb, R. T. Higashida, E. C. Jauch, C. Kidwell, et al. Guidelines for the Early Management of Adults With Ischemic Stroke: A Guideline From the American Heart Association/American Stroke Association Stroke Council, Clinical Cardiology Council, Cardiovascular Radiology and Intervention Council, and the Atherosclerotic Peripheral Vascular Disease and Quality of Care Outcomes in Research Interdisciplinary Working Groups: The American Academy of Neurology affirms the value of this guideline as an educational tool for neurologists. Circulation, May 22, 2007; 115(20): e478 - e534. [Abstract] [Full Text] [PDF] |
||||
![]() |
H. P. Adams Jr, G. del Zoppo, M. J. Alberts, D. L. Bhatt, L. Brass, A. Furlan, R. L. Grubb, R. T. Higashida, E. C. Jauch, C. Kidwell, et al. Guidelines for the Early Management of Adults With Ischemic Stroke: A Guideline From the American Heart Association/ American Stroke Association Stroke Council, Clinical Cardiology Council, Cardiovascular Radiology and Intervention Council, and the Atherosclerotic Peripheral Vascular Disease and Quality of Care Outcomes in Research Interdisciplinary Working Groups: The American Academy of Neurology affirms the value of this guideline as an educational tool for neurologists Stroke, May 1, 2007; 38(5): 1655 - 1711. [Abstract] [Full Text] [PDF] |
||||
![]() |
K. Toyoda Response to Letter by Tsivgoulis et al Stroke, March 1, 2007; 38(3): 861 - 861. [Full Text] [PDF] |
||||
![]() |
K. Toyoda, Y. Okada, S. Fujimoto, N. Hagiwara, K. Nakachi, T. Kitazono, S. Ibayashi, and M. Iida Blood Pressure Changes During the Initial Week After Different Subtypes of Ischemic Stroke Stroke, October 1, 2006; 37(10): 2637 - 2639. [Abstract] [Full Text] [PDF] |
||||
![]() |
M. Mogi, J.-M. Li, J. Iwanami, L.-J. Min, K. Tsukuda, M. Iwai, and M. Horiuchi Angiotensin II Type-2 Receptor Stimulation Prevents Neural Damage by Transcriptional Activation of Methyl Methanesulfonate Sensitive 2 Hypertension, July 1, 2006; 48(1): 141 - 148. [Abstract] [Full Text] [PDF] |
||||
![]() |
J. D. Spence Treating Hypertension in Acute Stroke: A Better Arrow for the Quiver Hypertension, June 1, 2006; 47(6): 1051 - 1051. [Full Text] [PDF] |
||||
![]() |
R. L. Sacco, R. Adams, G. Albers, M. J. Alberts, O. Benavente, K. Furie, L. B. Goldstein, P. Gorelick, J. Halperin, R. Harbaugh, et al. Guidelines for Prevention of Stroke in Patients With Ischemic Stroke or Transient Ischemic Attack: A Statement for Healthcare Professionals From the American Heart Association/American Stroke Association Council on Stroke: Co-Sponsored by the Council on Cardiovascular Radiology and Intervention: The American Academy of Neurology affirms the value of this guideline. Circulation, March 14, 2006; 113(10): e409 - e449. [Abstract] [Full Text] [PDF] |
||||
![]() |
S. G. Tsouli, E. N. Liberopoulos, D. N. Kiortsis, D. P. Mikhailidis, and M. S. Elisaf Combined Treatment With Angiotensin-Converting Enzyme Inhibitors and Angiotensin II Receptor Blockers: A Review of the Current Evidence Journal of Cardiovascular Pharmacology and Therapeutics, March 1, 2006; 11(1): 1 - 15. [Abstract] [PDF] |
||||
![]() |
B. Ovbiagele, N. K. Hills, J. L. Saver, S. C. Johnston, and for the CASPR Investigators Secondary-prevention drug prescription in the very elderly after ischemic stroke or TIA Neurology, February 14, 2006; 66(3): 313 - 318. [Abstract] [Full Text] [PDF] |
||||
![]() |
R. L. Sacco, R. Adams, G. Albers, M. J. Alberts, O. Benavente, K. Furie, L. B. Goldstein, P. Gorelick, J. Halperin, R. Harbaugh, et al. Guidelines for Prevention of Stroke in Patients With Ischemic Stroke or Transient Ischemic Attack: A Statement for Healthcare Professionals From the American Heart Association/American Stroke Association Council on Stroke: Co-Sponsored by the Council on Cardiovascular Radiology and Intervention: The American Academy of Neurology affirms the value of this guideline. Stroke, February 1, 2006; 37(2): 577 - 617. [Abstract] [Full Text] [PDF] |
||||
![]() |
J.-M. Boulanger and M. D. Hill Morbidity and Mortality After Stroke--Eprosartan Compared With Nitrendipine for Secondary Prevention: Principal Results of a Prospective Randomized Controlled Study (MOSES) Stroke, February 1, 2006; 37(2): 335 - 336. [Full Text] [PDF] |
||||
![]() |
Prepared by: British Cardiac Society, British Hype JBS 2: Joint British Societies' guidelines on prevention of cardiovascular disease in clinical practice Heart, December 1, 2005; 91(suppl_5): v1 - v52. [Full Text] [PDF] |
||||
![]() |
Additional Information JAMA, November 2, 2005; 294(17): E1 - E3. [Full Text] [PDF] |
||||
![]() |
H. S. Kirshner, J. Biller, and A. S. Callahan III Long-Term Therapy to Prevent Stroke J Am Board Fam Med, November 1, 2005; 18(6): 528 - 540. [Abstract] [Full Text] [PDF] |
||||
![]() |
B. Ovbiagele, N. K. Hills, J. L. Saver, and S. C. Johnston Antihypertensive Medications Prescribed at Discharge After an Acute Ischemic Cerebrovascular Event Stroke, September 1, 2005; 36(9): 1944 - 1947. [Abstract] [Full Text] [PDF] |
||||
![]() |
J. Schrader, S. Luders, A. Kulschewski, F. Hammersen, K. Plate, J. Berger, W. Zidek, P. Dominiak, H. C. Diener, and the MOSES Study Group Morbidity and Mortality After Stroke, Eprosartan Compared With Nitrendipine for Secondary Prevention: Principal Results of a Prospective Randomized Controlled Study (MOSES) Stroke, June 1, 2005; 36(6): 1218 - 1224. [Abstract] [Full Text] [PDF] |
||||
![]() |
H. Adams, R. Adams, G. Del Zoppo, and L. B. Goldstein Guidelines for the Early Management of Patients With Ischemic Stroke: 2005 Guidelines Update A Scientific Statement From the Stroke Council of the American Heart Association/American Stroke Association Stroke, April 1, 2005; 36(4): 916 - 923. [Full Text] [PDF] |
||||
![]() |
V. Papademetriou, C. Farsang, D. Elmfeldt, A. Hofman, H. Lithell, B. Olofsson, I. Skoog, P. Trenkwalder, A. Zanchetti, and for the SCOPE Study Group Stroke prevention with the angiotensin II type 1-receptor blocker candesartan in elderly patients with isolated systolic hypertension: The study on cognition and prognosis in the elderly (SCOPE) J. Am. Coll. Cardiol., September 15, 2004; 44(6): 1175 - 1180. [Abstract] [Full Text] [PDF] |
||||
![]() |
|