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[Placebo effect and arterial pressure]

G Pannarale1, G L Serafini, O Spadaro

  • 1II Cattedra di Cardiologia, Università degli Studi di Roma La Sapienza.

Minerva Cardioangiologica
|April 1, 1994
PubMed
Summary

This study explored whether taking a placebo could influence blood pressure readings in people with mild to moderate high blood pressure. Researchers measured both office and 24-hour ambulatory blood pressure before and after a two-week placebo treatment. They found that daytime blood pressure readings decreased significantly after the placebo, but office and nighttime readings remained unchanged. The authors suggest that psychological factors, such as alerting reactions to the monitoring process, may explain the daytime changes. These findings indicate that placebo effects can influence certain blood pressure measurements without affecting others, highlighting the role of psychological responses in physiological monitoring.

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Area of Science:

  • Clinical hypertension management
  • Psychophysiological responses in cardiovascular medicine

Background:

Prior research has shown that placebo effects can influence physiological measurements, but uncertainty remains about their impact on blood pressure readings. It was already known that office blood pressure (OBP) measurements may not fully reflect a patient's true blood pressure profile. No prior work had resolved whether placebo effects specifically alter 24-hour ambulatory blood pressure (ABP) readings. Existing studies suggest that psychological factors may play a role in cardiovascular responses. However, the extent to which these effects influence daytime versus nighttime ABP remains unclear. This gap motivated researchers to investigate placebo effects in patients with mild to moderate hypertension. That uncertainty drove the need for a controlled study focusing on both OBP and ABP measurements. No prior work had resolved whether placebo effects could reduce ABP without affecting OBP.

Purpose Of The Study:

This study aimed to determine whether placebo administration influences office and 24-hour ambulatory blood pressure readings in patients with mild to moderate hypertension. The specific problem addressed was whether placebo effects could alter ABP measurements independently of OBP changes. Researchers sought to clarify whether psychological or alerting effects might influence daytime blood pressure readings. The motivation stemmed from the need to better understand non-pharmacological influences on blood pressure monitoring. The study focused on patients with WHO stage I hypertension to isolate placebo effects from pharmacological interventions. The goal was to assess whether placebo could reduce daytime ABP without affecting nighttime or office readings. This problem had not been fully explored in prior research. The study aimed to provide evidence on the specificity of placebo effects in blood pressure monitoring.

Keywords:
placebo effectambulatory blood pressurehypertension monitoringsingle-blind study

Frequently Asked Questions

According to the authors, placebo administration led to a statistically significant decrease in daytime ABP in patients with mild and moderate hypertension.

The researchers used ABP monitoring to assess whether placebo effects influence blood pressure beyond office measurements, which may be affected by white-coat hypertension.

The study used a p-value threshold of less than 0.05 to determine statistical significance in blood pressure measurements after placebo administration.

The study found no statistically significant change in nighttime ABP after placebo administration, suggesting a more specific influence on daytime measurements.

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Main Methods:

The study used a single-blind design with ten patients diagnosed with mild to moderate essential hypertension. Participants underwent office and 24-hour ambulatory blood pressure measurements at baseline and after two weeks of placebo treatment. Blood pressure readings were collected using standard clinical protocols and ABP monitoring devices. The study compared initial and final measurements to assess changes over the placebo period. No active drugs were administered during the study period. Researchers analyzed differences in OBP, daytime ABP, and nighttime ABP separately. Statistical significance was determined using appropriate tests for within-subject comparisons. The study focused on detecting changes in ABP that could not be attributed to placebo effects on OBP.

Main Results:

The study found a statistically significant decrease in daytime ABP after placebo administration. Daytime ABP dropped from 155/96 mmHg to 147/90 mmHg (p < 0.05). No significant changes were observed in office blood pressure or nighttime ABP measurements. The average office blood pressure remained stable at 156/100 mmHg and 152/98 mmHg. Nighttime ABP decreased slightly but not significantly from 139/81 mmHg to 134/79 mmHg. These findings suggest that placebo effects may specifically influence daytime ABP readings. The magnitude of the daytime ABP decrease was consistent across most participants. The lack of change in nighttime ABP indicates a more specific psychological influence during waking hours.

Conclusions:

The authors suggest that placebo effects may influence daytime ambulatory blood pressure measurements in patients with mild to moderate hypertension. They propose that psychological alerting effects may explain the observed changes in daytime ABP. The study supports the idea that placebo effects can alter physiological readings without affecting office measurements. No prior work had resolved whether these effects are limited to daytime readings. The findings imply that psychological factors may play a role in ABP monitoring outcomes. The authors note that these effects may be more pronounced in selected patients with mild hypertension. The study does not establish a causal relationship between placebo administration and ABP changes. The results suggest the need for further research on the mechanisms behind these effects.

Failed At:

2026-07-14T07:44:39.179416+00:00

Participants had an average age of 51 ± 9 years, with six males and four females included in the study.

The authors propose that alerting reactions to the first ABP monitoring sessions may explain the observed decrease in daytime blood pressure after placebo administration.