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Clinical Trials01:16

Clinical Trials

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Clinical trials are prospective experimental studies conducted on humans to determine the safety and efficacy of treatments, drugs, diet methods, and medical devices. Using statistics in clinical trials enables researchers to derive reasonable and accurate conclusions from the collected data, allowing them to make wise decisions in uncertain situations. In medical research, statistical methods are crucial for preventing errors and bias.
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Hazard Ratio01:12

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The hazard ratio (HR) is a widely used measure in clinical trials to compare the risk of events, such as death or disease recurrence, between two groups over time. It reflects the ratio of hazard rates—the instantaneous risk of the event occurring—between a treatment group and a control group. This measure provides valuable insights into the relative effectiveness of a treatment by assessing how the risk of an event differs between the two groups.
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Does This Adult Patient Have Hypertension?: The Rational Clinical Examination Systematic Review.

Anthony J Viera1, Yuichiro Yano1,2, Feng-Chang Lin3

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|July 27, 2021
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Office blood pressure (BP) measurements are less accurate for diagnosing hypertension. Home BP monitoring (HBPM) is more reliable than office readings, but 24-hour ambulatory BP monitoring (ABPM) remains the gold standard for accurate hypertension diagnosis.

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Area of Science:

  • Cardiovascular Medicine
  • Hypertension Diagnosis
  • Diagnostic Accuracy Studies

Background:

  • Office blood pressure (BP) measurements are the conventional method for hypertension diagnosis but lack accuracy.
  • Out-of-office BP monitoring, including home BP monitoring (HBPM) and 24-hour ambulatory BP monitoring (ABPM), offers alternatives.
  • ABPM is recognized as the reference standard for BP assessment.

Purpose of the Study:

  • To systematically review the accuracy of oscillometric office and home BP measurement methods.
  • To evaluate the ability of these methods to correctly classify adults with hypertension.
  • Hypertension classification was defined using 24-hour ABPM as the reference standard.

Main Methods:

  • A comprehensive literature search was conducted across multiple databases (PubMed, Cochrane Library, Embase, etc.) up to April 2021.
  • Two authors independently abstracted data and assessed study quality; a third author resolved discrepancies.
  • Random effects models were used to calculate summary sensitivity, specificity, and likelihood ratios (LRs) for BP measurement methods.

Main Results:

  • Twelve studies (n=6877) evaluated office BP measurements, and six studies (n=2049) evaluated HBPM against 24-hour ABPM.
  • Conventional office BP measurements (≥140/90 mm Hg) showed 51% sensitivity and 88% specificity.
  • Home BP monitoring (HBPM) (≥135/85 mm Hg) demonstrated higher sensitivity (75%) and specificity (76%) compared to office measurements.

Conclusions:

  • Office BP measurements may not be sufficiently accurate to definitively diagnose or exclude hypertension.
  • Home BP monitoring (HBPM) can be a valuable tool for confirming a hypertension diagnosis.
  • When office and home BP readings are discordant or uncertain, 24-hour ABPM is recommended for definitive diagnosis.