Monitoring Initial Response to Angiotensin-Converting Enzyme Inhibitor–Based Regimens Academic Article uri icon

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abstract

  • Most clinicians monitor blood pressure to estimate a patient's response to blood pressure-lowering therapy. However, the apparent change may not actually reflect the effect of the treatment, because a person's blood pressure varies considerably even without the administration of drug therapy. We estimated random background within-person variation, apparent between-person variation, and true between-person variation in blood pressure response to angiotensin-converting enzyme inhibitors after 3 months. We used meta-analytic mixed models to analyze individual patient data from 28 281 participants in 7 randomized, controlled trials from the Blood Pressure Lowering Trialists Collaboration. The apparent between-person variation in response was large, with SDs for change in systolic blood pressure/diastolic blood pressure of 15.2/8.5 mm Hg. Within-person variation was also large, with SDs for change in systolic blood pressure/diastolic blood pressure of 14.9/8.45 mm Hg. The true between-person variation in response was small, with SDs for change in systolic blood pressure/diastolic blood pressure of 2.6/1.0 mm Hg. The proportion of the apparent between-person variation in response that was attributed to true between-person variation was only 3% for systolic blood pressure and 1% for diastolic blood pressure. In conclusion, most of the apparent variation in response is not because of true variation but is a consequence of background within-person fluctuation in day-to-day blood pressure levels. Instead of monitoring an individual's blood pressure response, a better approach may be to simply assume the mean treatment effect.

authors

  • Bell, Katy JL
  • Hayen, Andrew
  • Macaskill, Petra
  • Craig, Jonathan C
  • Neal, Bruce C
  • Fox, Kim M
  • Remme, Willem J
  • Asselbergs, Folkert W
  • van Gilst, Wiek H
  • MacMahon, Stephen
  • Remuzzi, Giuseppe
  • Ruggenenti, Piero
  • Teo, Koon
  • Irwig, Les

publication date

  • September 2010