Placebo response in asthma: A robust and objective phenomenon

• Published in: Journal of allergy and clinical immunology Vol. 119; no. 6; pp. 1375 - 1381
• Main Authors: Kemeny, Margaret E., PhD, Rosenwasser, Lanny J., MD, Panettieri, Reynold A., MD, Rose, Robert M., MD, Berg-Smith, Steve M., MSc, Kline, Joel N., MD, MSc
• Format: Journal Article
• Language: English
• Published: New York, NY Mosby, Inc 01.06.2007; Elsevier; Elsevier Limited
• Subjects: Adolescent; Adult; Albuterol - administration & dosage; Albuterol - analogs & derivatives; Allergy and Immunology; Asthma; Asthma - diagnosis; Asthma - drug therapy; Asthma - psychology; Behavior; Biological and medical sciences; Brain research; Bronchial Hyperreactivity - prevention & control; Bronchial Hyperreactivity - psychology; bronchial hyperresponsiveness; central nervous system; Clinical trials; Cross-Over Studies; Double-Blind Method; Drug dosages; Female; Fundamental and applied biological sciences. Psychology; Fundamental immunology; Humans; Male; Medical sciences; Middle Aged; mind-body; Mortality; Pain; Physician's Role - psychology; placebo; Placebo Effect; Placebos; Predictive Value of Tests; psychology; Salmeterol Xinafoate; Sarcoidosis. Granulomatous diseases of unproved etiology. Connective tissue diseases. Elastic tissue diseases. Vasculitis; Single-Blind Method; Studies; Dose level of methacholine during which a 20% decrease in FEV 1 was noted; Body mass index; Calculated concentration of methacholine required to induce a 20% decrease in FEV 1; mind-body; psychology; bronchial hyperresponsiveness; PD 20; PC 20; placebo; Asthma; central nervous system; BMI; Lung disease; Immunopathology; bronchial hyperresponslveness; Respiratory disease; Central nervous system; Respiratory system; Respiratory tract; Immunology; Placebo; Bronchus disease; Obstructive pulmonary disease
• ISSN: 0091-6749; 1097-6825
• DOI: 10.1016/j.jaci.2007.03.016

Background Placebos are hypothesized to exert positive effects on medical conditions by enhancing patient expectancies. Recent reviews suggest that placebo benefits are restricted to subjective responses, like pain, but might be ineffective for objective physiologic outcomes. Nevertheless, mind-body links and placebo responsivity in asthma are widely believed to exist. Objective We carried out a randomized, double-blind investigation to (1) determine whether placebo can suppress airway hyperreactivity in asthmatic subjects, (2) quantify the placebo effect, (3) identify predictors of the placebo response, and (4) determine whether physician interventions modify the placebo response. Methods In a double-blind, crossover design investigation, 55 subjects with mild intermittent and persistent asthma with stable airway hyperreactivity were randomized to placebo or salmeterol before serial methacholine challenges. Subjects were additionally randomized to physician interactions that communicated either positive or neutral expectancies regarding drug effect. Results Placebo bronchodilator administration significantly reduced bronchial hyperreactivity compared with baseline (the calculated concentration of methacholine required to induce a 20% decrease in FEV1 nearly doubled); 18% of subjects were placebo responders by using conservative definitions. Experimental manipulation of physician behavior altered perceptions of the physician but not the magnitude or frequency of the placebo response. Conclusions Objective placebo effects exist in asthma. These responses are of significant magnitude and likely to be meaningful clinically. The placebo response was not modulated by alterations in physician behavior in this study. Clinical implications The placebo response in patients with asthma is important in understanding the limitations of clinical research studies and in maximizing safe and effective therapies. This article confirms the existence of a strong placebo response in an objective and clinically relevant measure of disease activity.