title: Heart rate and respiratory response to doxapram in patients with panic disorder.
abstract: Panic disorder (PD) is characterized by anticipatory anxiety and panic, both causing physiological arousal. We investigated the differential responses between anticipatory anxiety and panic in PD and healthy controls (HC). Subjects (15 PD and 30 HC) received an injection of a respiratory stimulant, doxapram, with a high rate of producing panic attacks in PD patients, or an injection of saline. PD subjects had significantly higher scores in anxiety and panic symptoms during both conditions. Analysis of heart rate variability (HRV) indices showed higher sympathetic activity (LF) during anticipatory anxiety and panic states, an increase in the ratio of LF/HF during the anticipatory and panic states and a decrease in parasympathetic (HF) component in PD patients. During doxapram PD subjects increased their LF/HF ratio while HC had a reduction in LF/HF. Parasympathetic component of HRV was lower during anticipatory anxiety in PD. In general, PD showed greater sympathetic and psychological responses related to anxiety and sensations of dyspnea, reduced parasympathetic responses during anticipatory and panic states, but no differences in respiratory response. This confirms previous studies showing that PD patients do not have an intrinsic respiratory abnormality (either heightened or dysregulated) at the level of the brain stem but rather an exaggerated fear response.
authors.affiliation: New York University Medical Center, New York, NY, USA. Electronic address: jose.martinez@nyumc.org.
authors.forename: Jose M
authors.initials: JM
authors.lastname: Martinez
authors.affiliation: Department of Psychiatry, Icahn School of Medicine at Mount Sinai, New York, NY, USA; Silver Hill Hospital, New Canaan, CT, USA; Department of Psychiatry, Yale School of Medicine, New Haven, CT, USA.
authors.forename: Amir
authors.initials: A
authors.lastname: Garakani
authors.affiliation: Department of Psychiatry, Icahn School of Medicine at Mount Sinai, New York, NY, USA.
authors.forename: Cindy J
authors.initials: CJ
authors.lastname: Aaronson
authors.affiliation: Franklin Behavioral Health Consultants, Bronx, NY, USA.
authors.forename: Jack M
authors.initials: JM
authors.lastname: Gorman
mesh_terms: D000328:Adult; D001143:Arousal / Q000187:drug effects / Q000502:physiology; D018592:Cross-Over Studies; D004315:Doxapram / Q000494:pharmacology*; D005260:Female; D006339:Heart Rate / Q000187:drug effects* / Q000502:physiology; D006801:Humans; D008297:Male; D008875:Middle Aged; D016584:Panic Disorder / Q000503:physiopathology*; D056152:Respiratory Rate / Q000187:drug effects* / Q000502:physiology; D013564:Sympathetic Nervous System / Q000187:drug effects / Q000503:physiopathology
chemical_list: D004315:Doxapram
keywords: Anticipatory anxiety; Autonomic; Heart rate variability (HRV); Panic; Physiology; Respiration
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