Incidence of Adverse Events with Telmisartan Compared with ACE Inhibitors: Evidence from a Pooled Analysis of Clinical Trials
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Patient Preference and Adherence Dovepress open access to scientific and medical research Open Access Full Text Article ORigiNAL RESEARCH Incidence of adverse events with telmisartan compared with ACE inhibitors: evidence from a pooled analysis of clinical trials Giuseppe Mancia1 Abstract: Telmisartan is indicated for the prevention of cardiovascular events in high-risk Helmut Schumacher2 patients, based on comparable efficacy to the angiotensin-converting enzyme (ACE) inhibi- tor, ramipril, in the ONgoing Telmisartan Alone and in combination with Ramipril Global 1Universita degli Studi Milano-Bicocca, Ospedale San Gerardo di Monza, Endpoint Trial (ONTARGET®) trial. However, tolerability must be considered when selecting Milan, Italy; 2Boehringer Ingelheim treatments. This analysis compared the tolerability of telmisartan and ACE inhibitors using Pharma GmbH and Co KG, Ingelheim, Germany data pooled from 12 comparative, randomized studies involving 2564 telmisartan-treated patients and 2144 receiving ACE inhibitors (enalapril, lisinopril, or ramipril). Incidence rates of adverse events for the combined ACE inhibitor treatments and for telmisartan were similar (42.8% vs 43.9%, respectively) as were the rates of serious adverse events (1.8% vs 1.7% for For personal use only. telmisartan, respectively). Patients receiving ACE inhibitors had more cough (8.6% vs 2.6% with telmisartan, P , 0.0001). Results were similar irrespective of age, gender, or ethnicity. The adverse event of angioedema was observed in four patients (0.2%) receiving ACE inhibitors versus none with telmisartan (P = 0.043). There were small, numerical differences in serious adverse events. A total of 107 patients (5.0%) receiving ACE inhibitors and 93 patients (3.6%) receiving telmisartan discontinued treatment because of adverse events (P = 0.021); of these, 32.7% and 5.4%, respectively, were discontinuations due to cough (relative risk reduction of 88% [P , 0.0001] with telmisartan). Telmisartan and ACE inhibitors produced comparable blood pressure reductions at marketed doses. Telmisartan and ACE inhibitors are suitable for the prevention of cardiovascular events in high-risk patients, but telmisartan is better tolerated, particularly with regard to cough. Keywords: adverse drug event, angiotensin-converting enzyme inhibitors, angiotensin II type 1 Patient Preference and Adherence downloaded from https://www.dovepress.com/ by 137.108.70.13 on 14-May-2019 receptor blockers, cough, hypertension Introduction Angiotensin II receptor blockers (ARBs) inhibit the deleterious angiotensin type 1 receptor-mediated vasoconstrictor, proliferative, and atherogenic effects of angiotensin II, which play important roles in the development of hypertension and cardiovascular disease.1 Like angiotensin-converting enzyme (ACE) inhibitors, ARBs provide effective blood pressure control in hypertensive patients.2 Furthermore, the Correspondence: Giuseppe Mancia ARB, telmisartan, has been shown to reduce cardiovascular mortality and morbidity in Department of Clinical Medicine, a broad population of high-risk patients.3 Moreover, ARBs are associated with greater Universita degli Studi Milano-Bicocca, adherence to therapy than ACE inhibitors,4,5 possibly due to their favorable tolerability Ospedale San Gerardo di Monza, Via Donizetti 106, I-20052 Monza-Milan, Italy profile.6 This latter finding has important clinical implications because treatment dis- Tel +39 03 9233 3357 continuations are a major factor contributing to poor blood pressure control7 and are Fax +39 03 932 2274 Email [email protected] associated with increased cardiovascular risk and increased health care costs.8 submit your manuscript | www.dovepress.com Patient Preference and Adherence 2012:6 1–9 1 Dovepress © 2012 Mancia and Schumacher, publisher and licensee Dove Medical Press Ltd. This is an Open Access http://dx.doi.org/10.2147/PPA.S27939 article which permits unrestricted noncommercial use, provided the original work is properly cited. Powered by TCPDF (www.tcpdf.org) 1 / 1 Mancia and Schumacher Dovepress Telmisartan is an ARB that is indicated both for the which were included in the Boehringer Ingelheim database treatment of hypertension and for the reduction of cardiovascu- and completed between 1994 and 2007. These comprised lar morbidity in patients at high risk of cardiovascular events.9 12 randomized studies (study designations 1236.1, 502.202, This latter indication is based on the results of the ONgoing 502.206, 502.210, 502.211, 502.214, 502.222, 502.223, Telmisartan Alone and in combination with Ramipril Global 502.317, 502.331, 502.391, 502.392). Two of the trials Endpoint Trial (ONTARGET®), which involved 25,620 patients (502.222 and 502.223) selected patients who had previ- with vascular disease or diabetes mellitus and end-organ dam- ously experienced cough on ACE inhibitors. In all studies, age, in which telmisartan reduced the incidence of the primary treatment was given once daily in the morning. The trial- endpoint (a composite of cardiovascular death, myocardial specified duration of treatment ranged from 28 to 365 days. infarction, stroke, or hospitalization for heart failure) to the All trials were of monotherapy only and no antihypertensive same extent as the established treatment for such patients, the treatment other than the study drug was allowed during the ACE inhibitor, ramipril.3 In this study, more patients discon- treatment period. The ONTARGET trial was not included tinued treatment with ramipril than with telmisartan (23.7% vs because patients recruited to this study were prescreened for 21.0%, respectively), despite the fact that patients were screened ACE inhibitor tolerance and the study allowed additional for intolerance to ACE inhibitors before enrolment, and that antihypertensive therapy. All studies were approved by local strenuous efforts were made to retain patients in the study. It ethics committees and patients provided informed consent might be expected that a larger discrepancy between patient before enrolment. discontinuation rates should be seen in patients who had not Eight studies were double-blind, and four used a prospec- been screened for ACE inhibitor intolerance, because cough tive randomized, open-label, blinded-endpoint design. All associated with ACE inhibitors is known to be an important involved patients with mild-to-moderate hypertension, with factor limiting adherence with these medications.10 most of the studies being defined as having diastolic blood We earlier presented evidence from a pooled analysis pressure between 95 and 114 mmHg. Patients were random- showing that telmisartan has a tolerability profile resembling ized to treatment with telmisartan (at daily doses of between For personal use only. placebo.11 However, to date, no study has compared in detail the 20 mg and 160 mg) or ACE inhibitors; the ACE inhibitors tolerability of ARBs and ACE inhibitors. Furthermore, a recent used were enalapril 5–20 mg; lisinopril 10–40 mg; or ramipril analysis of treatment discontinuations from antihypertensive 1.25–20 mg. In patients who had previously received antihy- treatment has found significant within-class differences.12 pertensive therapy, randomized treatment was preceded by a In this analysis of 131,472 patients aged 40–80 years who washout period, usually of 4 weeks’ duration, during which lived in Lombardy, Italy, there was significant heterogeneity patients received placebo. Treatment was given at a fixed in treatment discontinuations among ACE inhibitors and, to dose in seven studies, and following dose titration according a lesser extent, among ARBs. Thus, comparisons of toler- to blood pressure responses in five studies. ability between drugs within a class, as well as between drug classes, are important. In this study, we used pooled data from Safety evaluation manufacturer-sponsored comparative studies of telmisartan An adverse event was defined as any untoward medical occur- Patient Preference and Adherence downloaded from https://www.dovepress.com/ by 137.108.70.13 on 14-May-2019 in hypertensive patients to assess the incidence of adverse rence that was reported by a patient or identified during clini- events with telmisartan compared with ACE inhibitors, as cal evaluation. Serious adverse events were defined as those a class and individually. In contrast with previous analyses that were fatal or life-threatening, or required hospitalization that have pooled published data from a wide variety of trials of the patient or extension of the period of hospitalization. (eg, Bangalore et al10), we had access to the complete telmis- All adverse events, whether reported spontaneously by the artan trials database. This allowed us to analyze patient-level patient or detected by the investigator, that occurred during data, to ensure consistency in the recording of adverse events the treatment phase or within a day after discontinuation of to avoid publication bias (which can introduce errors into treatment, were recorded and coded according to the Medical analyses that rely on published sources). Dictionary for Regulatory Activities (MedDRA) v 8.1. The intensity and causality of adverse events were recorded by Methods and materials the investigators; drug-related adverse events were defined Study design as events for which a causal relationship to the treatment This analysis used safety data from all studies comparing had been suspected by the reporting or reviewing healthcare telmisartan and ACE inhibitors in hypertensive patients,