Adherence to Antihypertensives in Patients With Comorbid Condition

Abstract

Background:Comorbidity has been noted as a potential barrier to proper adherence to antihypertensive medications.Objectives:We decided to investigate whether comorbidity could significantly affect adherence of Iranian patients with hypertension to their medication regimen.Patients and Methods:Two hundred and eighty consecutive hypertensive patients were interviewed in 4 cities of Iran. The 8-item Morisky medication adherence scale (MMAS-8) (validated in Persian) was used to assess medication adherence. This scale determines adherence by scores as lower than 6 (low adherence), 6 or 7 (moderate adherence), and 8 (high adherence). Comorbidity was considered as any concomitant medical condition, which necessitates the patient to take medicine for a minimum of 6 months prior to the interviews.Results:The most common comorbid conditions were ischemic heart disease (65 patients, 23.2%), diabetes mellitus (55 patients, 19.6%), and dyslipidemia (51 patients, 18.2%). Mean (± SD) MMAS-8 score in comorbid group was 5.68 (± 1.85) and in non-comorbid hypertensive patients, it was 5.83 (± 1.91) (P = 0.631). Mean (± SD) number of comorbidities was 1.53 (± 0.75) in low adherence group compared to 1.54 (± 0.77) in moderate/high adherers (P = 0.98). With increasing the number of comorbid diseases, the proportion of patients with high adherence decreased successively from 20% in those with no comorbid disease to 14.1% in those with one or two comorbid conditions, and finally 11.1% in those with 3 to 5 comorbid conditions.Conclusions:With increasing the number of comorbid conditions, the proportion of patients with high adherence decreases. In our opinion, this finding is a useful clinical note for healthcare providers when managing patients with hypertension who have other medical problems at the same time.

Non-Adherence to Antihypertensive Drugs: A Systematic Review and Meta-Analysis

“…Finally, 28 articles were included in the systematic review and 25 of these were included in the meta-analysis. [9,[11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][27][28][29][30][31][33][34][35][36] …”

“…Nine of the studies were conducted in the United States, [11,12,15,26,29,30,32,33,35] and 2 each in China, [11,17] Nigeria, [16,22] Hong Kong, [21,25] and Iran. [10,18] Countries such as Uganda, Lebanon, Kenya, Republic of Korea, Peru, Ethiopia, Ghana, Malaysia, Palestine, Brazil, and Italy were represented with a single study. [9,13,19,20,23,24,27,28,31,34,36] These studies were conducted on hypertensive patients to assess medication adherence using MMAS-8 between January 2009 and March 2016.…”

“…[9,13,19,20,23,24,27,28,31,34,36] These studies were conducted on hypertensive patients to assess medication adherence using MMAS-8 between January 2009 and March 2016. Twenty-four studies were cross-sectional [9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27] and others were cohort, [35] observational, [36] and interventional studies. [32] Only 1 randomized controlled trial (RCT) was found.…”

“…[29] The sample size of studies ranged from 25 [32] to 2445 [21] subjects. Eleven studies assessed adherence through face-to-face interviews, [10,14,18,20,[22][23][24]26,[29][30][31] while 8 studies used selfadministered questionnaires, [13,17,21,25,[32][33][34]36] and only 1 study was administered through a telephone interview. [35] However, 8 studies did not specify the type of MMAS-8 questionnaire administered.…”

“…[9,11,12,15,16,19,27,28] Except 1 study, [22] all the included studies met the quality criteria and showed high quality (>75%). [9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][29][30][31][32][33][34][35][36] …”