(Hypertension. 2002;39:744.)
© 2002 American Heart Association, Inc.
Scientific Contributions |
From the Clinica Medica e Dipartimento di Medicina Clinica, Prevenzione e Biotecnologie, Università Milano-Bicocca, Ospedale San Gerardo (G.M., S.C., G.G., A.L., R. Schiavina, G.C., R. Sega), Monza Milano, Italy; Centro Interuniversitario di Fisiologia Clinica e Ipertensione, Università Milano-Bicocca (G.M., G.G.), Milano, Italy; and Istituto Auxologico Italiano (G.M., G.G.), Milano, Italy.
Correspondence to Prof Giuseppe Mancia, Clinica Medica, Università di Milano-Bicocca, Ospedale San Gerardo, Via Donizetti 106, 20052 Monza, Milan, Italy.
| Abstract |
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Key Words: drug therapy hypertrophy, cardiac blood pressure
| Introduction |
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What reflection this has on hypertension-related organ damage has never been systematically investigated. In the PAMELA Study (Pressioni Arteriose Monitorate E Loro Associazioni), we had a chance to address this issue, because the subjects recruited consisted of a large sample representative of a population within the age range in which hypertension is common and treatment is protective.16 Furthermore, in all subjects, BP was measured not only in the doctors office but also at home and by ambulatory monitoring, thereby providing multiple independent information on its real value. Finally, measurements included an echocardiogram, which allowed organ damage to be assessed as an increase in left ventricular mass (LVM), ie, by a sensitive marker of cardiac structural alterations with proven prognostic significance.7
| Methods |
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62%, and the demographic characteristics and medical history (phone interview) of the nonparticipants in the study were similar to those of the overall population.2,9,10
BP Measurements
The methods have been described in detail previously.2,9,10 After being informed of their selection, the subjects were invited to undergo a visit at an outpatient clinic in the St Gerardo University Hospital of Monza in the morning of a working day to obtain a full medical history, a physical examination, and 3 sphygmomanometric BP measurements (in the sitting position). Subjects were then fitted with an ambulatory BP oscillometric device (Spacelabs 90207), which was removed 24 hours later.2,9,10 They were also instructed to take self-measurements of sitting BP at home using a semiautomatic oscillometric device (model HP 5331, Philips) at
7:00 PM and 7:00 AM.
Echocardiographic Measurements
An echocardiogram was obtained using an Accuson 128 C/F (Computer Sonography) to calculate left ventricular volume,11 LVM12 indexed to the body surface area,13 interventricular septal wall thickness (IVWT), and left ventricular posterior wall thickness sum (LVWT). The assessment of left ventricular hypertrophy (LVH), eccentric and concentric LVH, and left ventricular remodeling was based on the criteria proposed by Ganau et al.14 Echocardiographic tracings were obtained by 2 skilled operators and read by a third independent observer (intraobserver coefficients of variation 0.6% for left ventricular end-diastolic diameter, 3.1% for IVWT, and 3.2% for left ventricular posterior wall thickness).
Data Analysis
In each subject, averages were obtained for clinic, home, and ambulatory BP values, which were first edited from artifacts.9,10 Valid ambulatory systolic and diastolic BP readings were 95.1% and 94.9%, respectively, of the planned 72 readings. Individual data were separately averaged for normotensive subjects, untreated HT subjects, treated HT subjects with inadequate BP control, and treated HT subjects with BP control. Normotension (or BP control) was defined by (1) office BP criteria, ie, systolic <140 mm Hg and diastolic <90 mm Hg; (2) home BP criteria, ie, systolic <132 mm Hg and diastolic <83 mm Hg; or (3) ambulatory BP criteria, ie, 24-hour average systolic <125 mm Hg and 24-hour average diastolic <79 mm Hg. Untreated hypertension was defined as values exceeding the above-mentioned ones, combined with no treatment for at least 15 days before study. Treated HT subjects (defined by a history of current antihypertensive treatment) were further subdivided into a group in whom BP was inadequately controlled and a group in whom BP was controlled, again based on office, home, or ambulatory BP criteria. In treated HT subjects, averages were also obtained for the small subgroup in whom all 3 pressures were controlled, and data were compared with those of the group in which all BPs were normal. Home and 24-hour average BP values separating normotension (or BP control) from hypertension (or lack of BP control) were those previously identified as the upper limits of home and 24-hour BP normality in the PAMELA population.2,9,10
The statistical significance of the between-group differences was assessed by 2-way ANOVA, using Bonferroni correction for multiple comparisons. The between-group comparisons of echocardiographic variables were made also after adjustment for the effect of age, gender, and body mass index, using ANCOVA. A P<0.05 was taken as the level of statistical significance. Values are mean±SD.
An expanded Methods section can be found in an online data supplement available at http://www.hypertensionaha.org.
| Results |
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Similar findings were obtained when the subdivision in normotensive subjects, untreated HT subjects, treated HT subjects with inadequate BP control, and treated HT subjects with BP control was based on home (Table 2) and ambulatory (Table 3) BP criteria. In the treated HT group, treatment was reported to consist of a diuretic (23%), a ß-blocker (8%), a calcium antagonist (9%), an ACE inhibitor (18%), or a combination of 2 drugs or other treatments (42%). The corresponding percentages in treated patients with BP control were 18%, 19%, 7%, and 46%. Compared with subjects in whom office, home, and 24-hour average BP were all normal, LVM index, LVWT, and prevalence of LVH were also greater in the small number of treated HT subjects in whom all 3 pressures were controlled (Figure 1).
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The normotensive group of the PAMELA population had an age that was less than that of the untreated HT group and more so than that of the treated HT group in which BP was uncontrolled or controlled. To determine whether this age imbalance was responsible for the differences in echocardiographic values, the normotensive group was divided in age tertiles, the oldest of which had an age similar or greater than that of the other 3 groups. As shown in Table 4 the between-group differences in LVM index remained in most instances statistically significant, with a greater value in the treated HT group in which BP was controlled regardless whether office, home, or 24-hour BP was considered. Similarly, the between-group differences in LVM index remained statistically significant in most instances when data were submitted to ANCOVA, considering the effect of age, gender, and body mass index (Figure 2 and specific symbols in Tables 1, 2, and 3).
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| Discussion |
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A unique feature of the PAMELA Study was that office BP was measured together with home and ambulatory BP, which allowed us to investigate whether in hypertension normalization of BPs other than those measured in the clinical environment might more accurately reflect the ability of treatment to cause regression of the echocardiographic abnormalities. This is a plausible hypothesis because home and ambulatory BP are (1) more reproducible than office BP,17,18 (2) devoid of confounding factors such as the "white coat" effect and its variable attenuation by treatment,19,20 and (3) more closely related to LVM than office BP.18,21 The results, however, do not support it because in treated HT subjects, an increase in LVM index, LVWT, and prevalence of LVH was similarly manifest when (1) BP control by treatment was based on office, home, and ambulatory values; (2) treatment made 24-hour BP virtually superimposable to that of the normotensive fraction of the population; and (3) all 3 BPs had been reduced by treatment to the normal range, with home and office values superimposable to those of normotensive individuals. Thus, in treated HT subjects, echocardiographic abnormalities persist regardless whether BP control refers to office or daily life values. Furthermore, these observations do not disappear when the most important daily life BP values for LVM, ie, the ambulatory ones, are entirely normalized.
Two other results of our study deserve to be mentioned. First, in our population, eccentric LVH was much more frequent than concentric LVH, regardless of whether BP was normal or elevated and whether treatment did or did not achieve BP control. This is in line with the results of other studies,22,23 to which we can add, however, that the relative prevalence of these 2 cardiac structural abnormalities is not substantially affected by the lesser or greater effectiveness of treatment. Second, a number of subjects showed a normal LVM to be accompanied by concentric left ventricular remodeling, the prevalence being greater in the HT fractions than in the normotensive fraction of the population. When home and ambulatory BP values were considered, these differences persisted after adjustment for body mass index. Thus, regardless the presence or absence of treatment and BP control, hypertension is responsible also for causing cardiac structural alterations that precede a LVM increase.
Our population study had a cross-sectional nature that makes clarification of the mechanisms responsible for the persistence of echocardiographic alterations in the treated fraction of the HT population (in whom office, home, or ambulatory BP were reduced, controlled, and even entirely normalized) difficult. Three (not mutually exclusive) possibilities can be discussed, however. First, because of its cross-sectional nature, in our study we could not obtain reliable information on the duration of treatment and on BP control. It is therefore possible that persistence of cardiac structural abnormalities depended on a time factor, ie, that BP treatment and control was not maintained for the time necessary for complete regression of echocardiographic abnormalities to occur.24,25 Second, insufficient use was made of drugs that have been shown to more effectively allow regression of LVH to take place.24,25 Indeed, several patients in whom BP control was achieved reported to be under treatment with diuretics and/or ß-blockers, which have been shown to be less effective in reducing an elevated LVM than other antihypertensive drugs.24,25 Third, hypertension-related cardiac structural abnormalities can never completely regress because their appearance and progression are caused by not only the BP elevation but also the interaction of an increased cardiac workload with factors (genes, renin-angiotensin system, sympathetic nervous system, insulin, etc.)26 that directly favor an increase in cardiac cell volume.
Our results, however, should not be interpreted as to imply that BP-lowering interventions have a limited beneficial effect on hypertension-induced structural alterations of the heart. It should be emphasized that in treated HT subjects with BP control, these alterations were much less evident than in HT subjects with inadequate BP control. Furthermore, because of the cross-sectional nature of our population study, we cannot exclude that in treated HT subjects with inadequate BP control, BP, LVM index, and LVWT values were much greater originally than at the time our study was made. Our observations, however, clearly document that cardiac structural alterations are (or remain) frequent in the HT population in which treatment is implemented and that this is the case also when an effective BP control is achieved. This implies that this population remains by and large at a high cardiovascular risk.
Received June 5, 2001; first decision June 20, 2001; accepted December 17, 2001.
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