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Liu S, Wang J, Chen S, Chai J, Wen J, Tian X, Chen N, Xu C. Vagal predominance correlates with mood state changes of winter-over expeditioners during prolonged Antarctic residence. PLoS One 2024; 19:e0298751. [PMID: 38968274 PMCID: PMC11226091 DOI: 10.1371/journal.pone.0298751] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2023] [Accepted: 01/29/2024] [Indexed: 07/07/2024] Open
Abstract
OBJECTIVE Winter-over expeditioners in Antarctica are challenged by various environmental and psycho-social stress factors, which may induce psychophysiological changes. The autonomic nervous system (ANS) plays a crucial role in the adaptation process under stress. However, the relationship between ANS activity and the mood states of expeditioners remains largely unexplored. This study aims to uncover the pattern of ANS adjustment under extreme Antarctic environments and provide new insights into the correlations between ANS activity and mood state changes, which may provide scientific data for medical interventions. METHODS Fourteen expeditioners at Zhongshan Station participated in this study. The study was conducted during four representative periods: pre-Antarctica, Antarctica-1 (pre-winter), Antarctica-2 (winter), and Antarctica-3 (summer). The heart rate variability (HRV) of the expeditioners was continuously measured for 24 hours to evaluate ANS activity. Plasma levels of catecholamines were tested by ELISA. Mood states were assessed by the Profile of Mood States (POMS) scale. RESULTS HRV analysis showed a disturbance of ANS during winter and summer periods. For frequency domain parameters, very low frequency (VLF), low frequency (LF), high frequency (HF), and total power (TP) significantly increased during the second half of the mission. Especially, LF/HF ratio decreased during summer, indicating the predominance of vagal tone. Results of the time domain analysis showed increased heart rate variability during the austral winter and summer. Plasma epinephrine (E) significantly increased during residence in Antarctica. Compared with pre-Antarctica, the vigor, depression, and anger scores of the expeditioners decreased significantly during the austral summer. Notably, the depression score showed a moderate positive correlation with LF/HF, while weak negative correlations with other HRV indicators, including TP, VLF, and LF. Anger score showed a moderate positive correlation with LF/HF and weak negative correlations with the average normal-to-normal (NN) interval, and the root mean square of differences between adjacent RR intervals (RMSSD). Plasma E level weakly correlated with the average NN interval. CONCLUSION Prolonged residence in Antarctica increased the ANS activities and shifted the cardiac autonomic modulation towards vagal predominance. The alteration of HRV correlated with mood states and plasma epinephrine levels.
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Affiliation(s)
- Shiying Liu
- Institute of Basic Medical Sciences, Chinese Academy of Medical Sciences, Beijing, China
| | - Jianan Wang
- Institute of Basic Medical Sciences, Chinese Academy of Medical Sciences, Beijing, China
| | - Shaoling Chen
- Pingxiang Third People’s Hospital, Pingxiang, Jiangxi, China
| | - Jiamin Chai
- Institute of Basic Medical Sciences, Chinese Academy of Medical Sciences, Beijing, China
| | - Jigang Wen
- Institute of Basic Medical Sciences, Chinese Academy of Medical Sciences, Beijing, China
| | - Xuan Tian
- Institute of Basic Medical Sciences, Chinese Academy of Medical Sciences, Beijing, China
| | - Nan Chen
- Institute of Basic Medical Sciences, Chinese Academy of Medical Sciences, Beijing, China
| | - Chengli Xu
- Institute of Basic Medical Sciences, Chinese Academy of Medical Sciences, Beijing, China
- Center of Environmental and Health Sciences, Chinese Academy of Medical Sciences, Beijing, China
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Lin S, Du Y, Xia Y, Xiao L, Wang G. Resting-state EEG as a potential indicator to predict sleep quality in depressive patients. Int J Psychophysiol 2023; 191:1-8. [PMID: 37348762 DOI: 10.1016/j.ijpsycho.2023.06.007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2023] [Revised: 06/14/2023] [Accepted: 06/18/2023] [Indexed: 06/24/2023]
Abstract
OBJECTIVES To investigate the changes in sleep quality, heart rate variability (HRV) and resting-state electroencephalogram (rsEEG) in patients with major depressive disorder (MDD), and to explore whether HRV and rsEEG may be served as more convenient tools to assess sleep quality in MDD patients. METHOD We included a total of 91 subjects (46 healthy controls and 45 MDD patients) and compared their sleep quality, HRV and power spectra of rsEEG. Correlation analyses were conducted to discuss the relationship between HRV and seven factors of PSQI. Multiple linear regression model was used to examine whether absolute band power could predict sleep quality in MDD patients. RESULTS We found higher PSQI scores and lower levels of HRV in depressive individuals compared with healthy controls. In MDD patients, sleep latency was negatively correlated with RMSSD and HF. Delta, theta, and alpha band power of rsEEG were higher in MDD patients. Regression analyses showed delta band power of TP8, as well as theta, alpha band power of AF3 predicts PSQI score of MDD patients. CONCLUSIONS The findings of our study show that some aspects of sleep problems had negative correlations with parasympathetic activity and the regression model supports that the band power of rsEEG may be used as a potential indicator to evaluate the sleep quality in MDD patients. SIGNIFICANCE Cortical hyperarousal may be one of the reasons leading to poor sleep quality of MDD patients. And resting-state EEG can be used as a potential indicator for clinical assessment of MDD patients' sleep quality.
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Affiliation(s)
- Shanshan Lin
- Department of Psychiatry, Renmin Hospital of Wuhan University, Wuhan, China; Institute of Neuropsychiatry, Renmin Hospital of Wuhan University, Wuhan, China
| | - Yiwei Du
- Department of Psychiatry, Renmin Hospital of Wuhan University, Wuhan, China; Institute of Neuropsychiatry, Renmin Hospital of Wuhan University, Wuhan, China
| | - Yujie Xia
- Department of Psychiatry, Renmin Hospital of Wuhan University, Wuhan, China; Institute of Neuropsychiatry, Renmin Hospital of Wuhan University, Wuhan, China
| | - Ling Xiao
- Department of Psychiatry, Renmin Hospital of Wuhan University, Wuhan, China; Institute of Neuropsychiatry, Renmin Hospital of Wuhan University, Wuhan, China
| | - Gaohua Wang
- Department of Psychiatry, Renmin Hospital of Wuhan University, Wuhan, China; Institute of Neuropsychiatry, Renmin Hospital of Wuhan University, Wuhan, China; Taikang center for life and medical sciences, Wuhan University, Wuhan, China.
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Pham T, Lau ZJ, Chen SHA, Makowski D. Heart Rate Variability in Psychology: A Review of HRV Indices and an Analysis Tutorial. SENSORS (BASEL, SWITZERLAND) 2021; 21:3998. [PMID: 34207927 PMCID: PMC8230044 DOI: 10.3390/s21123998] [Citation(s) in RCA: 82] [Impact Index Per Article: 27.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/03/2021] [Revised: 06/04/2021] [Accepted: 06/04/2021] [Indexed: 12/16/2022]
Abstract
The use of heart rate variability (HRV) in research has been greatly popularized over the past decades due to the ease and affordability of HRV collection, coupled with its clinical relevance and significant relationships with psychophysiological constructs and psychopathological disorders. Despite the wide use of electrocardiograms (ECG) in research and advancements in sensor technology, the analytical approach and steps applied to obtain HRV measures can be seen as complex. Thus, this poses a challenge to users who may not have the adequate background knowledge to obtain the HRV indices reliably. To maximize the impact of HRV-related research and its reproducibility, parallel advances in users' understanding of the indices and the standardization of analysis pipelines in its utility will be crucial. This paper addresses this gap and aims to provide an overview of the most up-to-date and commonly used HRV indices, as well as common research areas in which these indices have proven to be very useful, particularly in psychology. In addition, we also provide a step-by-step guide on how to perform HRV analysis using an integrative neurophysiological toolkit, NeuroKit2.
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Affiliation(s)
- Tam Pham
- School of Social Sciences, Nanyang Technological University, Singapore 639818, Singapore; (T.P.); (Z.J.L.); (D.M.)
| | - Zen Juen Lau
- School of Social Sciences, Nanyang Technological University, Singapore 639818, Singapore; (T.P.); (Z.J.L.); (D.M.)
| | - S. H. Annabel Chen
- School of Social Sciences, Nanyang Technological University, Singapore 639818, Singapore; (T.P.); (Z.J.L.); (D.M.)
- Centre for Research and Development in Learning, Nanyang Technological University, Singapore 637460, Singapore
- Lee Kong Chian School of Medicine, Nanyang Technological University, Singapore 636921, Singapore
- National Institute of Education, Nanyang Technological University, Singapore 637616, Singapore
| | - Dominique Makowski
- School of Social Sciences, Nanyang Technological University, Singapore 639818, Singapore; (T.P.); (Z.J.L.); (D.M.)
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Ortiz A, Bradler K, Moorti P, MacLean S, Husain MI, Sanches M, Goldstein BI, Alda M, Mulsant BH. Reduced heart rate variability is associated with higher illness burden in bipolar disorder. J Psychosom Res 2021; 145:110478. [PMID: 33820643 DOI: 10.1016/j.jpsychores.2021.110478] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/30/2020] [Revised: 02/16/2021] [Accepted: 03/27/2021] [Indexed: 01/17/2023]
Abstract
BACKGROUND Bipolar disorder (BD) is associated with premature death and ischemic heart disease is the main cause of excess mortality. Heart rate variability (HRV) predicts mortality in patients with or without cardiovascular disease. While several studies have analyzed the association between HRV and BD, none has analyzed the association of HRV with illness burden in BD. METHODS 53 participants with BD I and II used a wearable device to assess the association between HRV and factors characterizing illness burden, including illness duration, number and type of previous episode(s), duration of the most severe episode, history of suicide attempts or psychotic symptoms during episodes, and co-morbid psychiatric disorders. We ran unadjusted models and models controlling statistically for age, sex, pharmacotherapy, baseline functional cardiovascular capacity, BMI, years of education, and marital status. We also explored the association between HRV and an overall illness burden index (IBI) integrating all these factors using a weighted geometric mean. RESULTS Adjusted and unadjusted models had similar results. Longer illness duration, higher number of depressive episodes, longer duration of most severe manic/hypomanic episode, co-morbid anxiety disorders, and family history of suicide were associated with reduced HRV, as was bipolar depression severity in the participants experiencing a depressive episode. Finally, a higher IBI score was associated with lower HRV. CONCLUSIONS High illness burden is associated with reduced HRV in BD. While the IBI needs to be validated in a larger sample, it may provide an overall measure that captures illness burden in BD.
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Affiliation(s)
- Abigail Ortiz
- Department of Psychiatry, University of Toronto, Toronto, ON, Canada; Centre for Addiction and Mental Health, Toronto, ON, Canada.
| | | | - Pooja Moorti
- Institute for Mental Health Research, The Royal Ottawa Hospital, Ottawa, ON, Canada
| | - Stephane MacLean
- Institute for Mental Health Research, The Royal Ottawa Hospital, Ottawa, ON, Canada
| | - M Ishrat Husain
- Department of Psychiatry, University of Toronto, Toronto, ON, Canada; Centre for Addiction and Mental Health, Toronto, ON, Canada
| | - Marcos Sanches
- Centre for Addiction and Mental Health, Toronto, ON, Canada
| | - Benjamin I Goldstein
- Department of Psychiatry, University of Toronto, Toronto, ON, Canada; Centre for Addiction and Mental Health, Toronto, ON, Canada
| | - Martin Alda
- Department of Psychiatry, Dalhousie University, Halifax, NS, Canada; National Institute of Mental Health, Klecany, Czech Republic
| | - Benoit H Mulsant
- Department of Psychiatry, University of Toronto, Toronto, ON, Canada; Centre for Addiction and Mental Health, Toronto, ON, Canada
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Heiss S, Vaschillo B, Vaschillo EG, Timko CA, Hormes JM. Heart rate variability as a biobehavioral marker of diverse psychopathologies: A review and argument for an "ideal range". Neurosci Biobehav Rev 2020; 121:144-155. [PMID: 33309905 DOI: 10.1016/j.neubiorev.2020.12.004] [Citation(s) in RCA: 37] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2020] [Accepted: 12/02/2020] [Indexed: 01/21/2023]
Abstract
Heart rate variability (HRV), a measure of the variability in intervals between subsequent heart beats, is now widely considered an index of emotion regulatory capacity and the ability to adapt flexibly to changing environmental demands. Abnormalities in HRV are implicated in a host of psychopathologies, making it a potentially powerful transdiagnostic biobehavioral change mechanism in treatment interventions. While most mental illnesses are associated with low HRV, eating disorders have been linked to elevated HRV. We examined 62 research articles on HRV in psychopathology to test the hypothesis that there is an "ideal range" of HRV that predicts optimal functioning. Relationships between symptom severity and parameters that quantify HRV were examined graphically. More extreme time-domain HRV measures, both high and low, were associated with psychopathology, whereas healthy controls displayed mid-range values. Findings preliminarily support the hypothesis that there is an "ideal range" of HRV that could be targeted in biofeedback interventions.
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Affiliation(s)
- Sydney Heiss
- Department of Psychology, University at Albany, State University of New York, USA.
| | - Bronya Vaschillo
- Department of Kinesiology and Health, Rutgers, The State University of New Jersey, USA
| | - Evgeny G Vaschillo
- Department of Kinesiology and Health, Rutgers, The State University of New Jersey, USA
| | - C Alix Timko
- Department of Child and Adolescent Psychiatry and Behavioral Sciences, The Children's Hospital of Philadelphia, USA
| | - Julia M Hormes
- Department of Psychology, University at Albany, State University of New York, USA
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Voggt A, Berger M, Obermeier M, Löw A, Seemueller F, Riedel M, Moeller H, Zimmermann R, Kirchberg F, Von Schacky C, Severus E. Heart Rate Variability and Omega-3 Index in Euthymic Patients with Bipolar Disorders. Eur Psychiatry 2020; 30:228-32. [DOI: 10.1016/j.eurpsy.2014.11.010] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/04/2014] [Revised: 11/17/2014] [Accepted: 11/17/2014] [Indexed: 10/24/2022] Open
Abstract
AbstractBackground:Affective disorders are associated with an increased risk of cardiovascular disease, which, at least partly, appears to be independent of psychopharmacological treatments used to manage these disorders. Reduced heart rate variability (SDNN) and a low Omega-3 Index have been shown to be associated with increased risk for death after myocardial infarction. Therefore, we set out to investigate heart rate variability and the Omega-3 Index in euthymic patients with bipolar disorders.Methods:We assessed heart rate variability (SDNN) and the Omega-3 Index in 90 euthymic, mostly medicated patients with bipolar disorders (Bipolar-I, Bipolar-II) on stable psychotropic medication, free of significant medical comorbidity and in 62 healthy controls. Heart rate variability was measured from electrocardiography under a standardized 30 minutes resting state condition. Age, sex, BMI, smoking, alcohol consumption and caffeine consumption as potential confounders were also assessed.Results:Heart rate variability (SDNN) was significantly lower in patients with bipolar disorders compared to healthy controls (35.4 msec versus 60.7 msec; P < 0.0001), whereas the Omega-3 Index did not differ significantly between the groups (5.2% versus 5.3%). In a linear regression model, only group membership (patients with bipolar disorders versus healthy controls) and age significantly predicted heart rate variability (SDNN).Conclusion:Heart rate variability (SDNN) may provide a useful tool to study the impact of interventions aimed at reducing the increased risk of cardiovascular disease in euthymic patients with bipolar disorders. The difference in SDNN between cases and controls cannot be explained by a difference in the Omega-3 Index.
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Freyberg J, Brage S, Kessing LV, Faurholt-Jepsen M. Differences in psychomotor activity and heart rate variability in patients with newly diagnosed bipolar disorder, unaffected relatives, and healthy individuals. J Affect Disord 2020; 266:30-36. [PMID: 32056891 PMCID: PMC7116568 DOI: 10.1016/j.jad.2020.01.110] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/08/2019] [Revised: 11/22/2019] [Accepted: 01/20/2020] [Indexed: 11/24/2022]
Abstract
BACKGROUND Heart rate variability (HRV) and psychomotor activity have been found reduced in bipolar disorder (BD) but has never been investigated in newly diagnosed BD and unaffected relatives. The present study aimed to compare HRV and psychomotor activity between newly diagnosed patients with BD, their unaffected first-degree relatives (UR), and healthy control individuals (HC). METHODS 20 newly diagnosed patients with BD, 20 of their UR, and 20 age- and sex-matched HC were included. Measurements of HRV for five minutes and heart rate and acceleration for seven days were conducted. Activity energy expenditure (AEE) was derived from the latter. Linear mixed effect regression models were conducted to compare the three groups. RESULTS HRV did not differ in any measure between the three groups of participants. Similarly, AEE (kJ/day/kg) did not differ between the three groups in neither daily means (BD: 63.6, UR: 64.1, HC: 62.1) nor when divided into quarter-daily intervals. LIMITATIONS The relatively small size of the study may affect the validity of the results. CONCLUSION Patients with newly diagnosed BD and UR do not present with decreased HRV or AEE. These results contrast prior findings from BD patients with more advanced stages of the disorder, suggesting that these outcomes progress with illness duration.
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Affiliation(s)
- Josefine Freyberg
- The Copenhagen Affective Disorder research Center (CADIC), Psychiatric Center Copenhagen, Rigshospitalet, and Faculty of Health and Medical Sciences, University of Copenhagen, Denmark
| | - Søren Brage
- MRC Epidemiology Unit, Cambridge, United Kingdom
| | - Lars Vedel Kessing
- The Copenhagen Affective Disorder research Center (CADIC), Psychiatric Center Copenhagen, Rigshospitalet, and Faculty of Health and Medical Sciences, University of Copenhagen, Denmark
| | - Maria Faurholt-Jepsen
- The Copenhagen Affective Disorder research Center (CADIC), Psychiatric Center Copenhagen, Rigshospitalet, and Faculty of Health and Medical Sciences, University of Copenhagen, Denmark.
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Druzhkova T, Pochigaeva K, Yakovlev A, Kazimirova E, Grishkina M, Chepelev A, Guekht A, Gulyaeva N. Acute stress response to a cognitive task in patients with major depressive disorder: potential metabolic and proinflammatory biomarkers. Metab Brain Dis 2019; 34:621-629. [PMID: 30564974 DOI: 10.1007/s11011-018-0367-3] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/19/2018] [Accepted: 12/10/2018] [Indexed: 02/06/2023]
Abstract
Responses of the hypothalamic-pituitary-adrenal axis (HPAA), immune system and metabolic pathways are involved in adaptation to stress, while alterations in these responses have been implicated in the development of major depressive disorder (MDD). Multiple laboratory indices are known to react in response to the acute stress, however, no valid biomarkers have been reported, which can differentiate stress response in depressed individuals. The aim of this study was to assess changes in a set of laboratory parameters in patients with MDD in response to a moderate mental stress and to find potential markers of altered stress reactivity associated with depression. A group of 33 MDD patients and 43 control subjects underwent clinical evaluation to assess depression and anxiety symptoms, as well as heart rate variability (HRV) analysis. Participants were asked to perform a time constrained cognitive task, and selected hormones (cortisol, ACTH), cytokines (IL-6, IL-1β, TNF-α), neurotrophic factors (BDNF, CNTF) and metabolic parameters (glucose, cholesterol, triglycerides) were measured before and 60 min after the task performance. HRV analysis showed increased sympathetic input in MDD patients. The MDD group manifested an elevated HPAA activity as well as IL-6 and CNTF levels at baseline. A specific stress-induced increase in glucose and TNF-α was revealed in the MDD group, which was absent in control subjects. The data confirm the impairments of stress response in MDD and suggest that the reaction of simple metabolic and pro-inflammatory indices to a mild stressogenic challenge may be indicative of a depressive state.
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Affiliation(s)
- Tatiana Druzhkova
- Healthcare Department of Moscow, Moscow Research and Clinical Center for Neuropsychiatry, Moscow, Russian Federation
| | - Ksenia Pochigaeva
- Healthcare Department of Moscow, Moscow Research and Clinical Center for Neuropsychiatry, Moscow, Russian Federation
| | - Aleksander Yakovlev
- Healthcare Department of Moscow, Moscow Research and Clinical Center for Neuropsychiatry, Moscow, Russian Federation
- Laboratory of Functional Biochemistry of the Nervous System, Institute of Higher Nervous Activity and Neurophysiology, Russian Academy of Sciences, Butlerova street 5a, Moscow, Russian Federation, 117485
| | - Evdokia Kazimirova
- Healthcare Department of Moscow, Moscow Research and Clinical Center for Neuropsychiatry, Moscow, Russian Federation
- Laboratory of Functional Biochemistry of the Nervous System, Institute of Higher Nervous Activity and Neurophysiology, Russian Academy of Sciences, Butlerova street 5a, Moscow, Russian Federation, 117485
| | - Maria Grishkina
- Healthcare Department of Moscow, Moscow Research and Clinical Center for Neuropsychiatry, Moscow, Russian Federation
| | - Aleksey Chepelev
- Healthcare Department of Moscow, Moscow Research and Clinical Center for Neuropsychiatry, Moscow, Russian Federation
| | - Alla Guekht
- Healthcare Department of Moscow, Moscow Research and Clinical Center for Neuropsychiatry, Moscow, Russian Federation
- Department of Neurology, Neurosurgery and Medical Genetics, Pirogov Russian National Research Medical University, Moscow, Russian Federation
| | - Natalia Gulyaeva
- Healthcare Department of Moscow, Moscow Research and Clinical Center for Neuropsychiatry, Moscow, Russian Federation.
- Laboratory of Functional Biochemistry of the Nervous System, Institute of Higher Nervous Activity and Neurophysiology, Russian Academy of Sciences, Butlerova street 5a, Moscow, Russian Federation, 117485.
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Carr O, de Vos M, Saunders KEA. Heart rate variability in bipolar disorder and borderline personality disorder: a clinical review. EVIDENCE-BASED MENTAL HEALTH 2017; 21:23-30. [PMID: 29223951 PMCID: PMC5800347 DOI: 10.1136/eb-2017-102760] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/15/2017] [Revised: 08/07/2017] [Accepted: 08/30/2017] [Indexed: 12/27/2022]
Abstract
Heart rate variability (HRV) in psychiatric disorders has become an increasing area of interest in recent years following technological advances that enable non-invasive monitoring of autonomic nervous system regulation. However, the clinical interpretation of HRV features remain widely debated or unknown. Standardisation within studies of HRV in psychiatric disorders is poor, making it difficult to reproduce or build on previous work. Recently, a Guidelines for Reporting Articles on Psychiatry and Heart rate variability checklist has been proposed to address this issue. Here we assess studies of HRV in bipolar disorder and borderline personality disorder against this checklist and discuss the implication for ongoing research in this area.
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Affiliation(s)
- Oliver Carr
- Institute of Biomedical Engineering, University of Oxford, Oxford, UK
| | - Maarten de Vos
- Institute of Biomedical Engineering, University of Oxford, Oxford, UK
| | - Kate E A Saunders
- University of Oxford Department of Psychiatry, Warneford Hospital, Oxford, UK.,Oxford Health NHS Foundation Trust, Warneford Hospital, Oxford, UK
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Hage B, Britton B, Daniels D, Heilman K, Porges SW, Halaris A. Diminution of Heart Rate Variability in Bipolar Depression. Front Public Health 2017; 5:312. [PMID: 29270399 PMCID: PMC5723669 DOI: 10.3389/fpubh.2017.00312] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2017] [Accepted: 11/06/2017] [Indexed: 02/06/2023] Open
Abstract
Autonomic nervous system (ANS) dysregulation in depression is associated with symptoms associated with the ANS. The beat-to-beat pattern of heart rate defined as heart rate variability (HRV) provides a noninvasive portal to ANS function and has been proposed to represent a means of quantifying resting vagal tone. We quantified HRV in bipolar depressed (BDD) patients as a measure of ANS dysregulation seeking to establish HRV as a potential diagnostic and prognostic biomarker for treatment outcome. Forty-seven BDD patients were enrolled. They were randomized to receive either escitalopram-celecoxib or escitalopram-placebo over 8 weeks in a double-blind study design. Thirty-five patients completed the HRV studies. Thirty-six healthy subjects served as controls. HRV was assessed at pretreatment and end of study and compared with that of controls. HRV was quantified and corrected for artifacts using an algorithm that incorporates time and frequency domains to address non-stationarity of the beat-to-beat heart rate pattern. Baseline high frequency-HRV (i.e., respiratory sinus arrhythmia) was lower in BDD patients than controls, although the difference did not reach significance. Baseline low-frequency HRV was significantly lower in BDD patients (ln4.20) than controls (ln = 5.50) (p < 0.01). Baseline heart period was significantly shorter (i.e., faster heart rate) in BDD patients than controls. No significant change in HRV parameters were detected over the course of the study with either treatment. These findings suggest that components of HRV may be diminished in BDD patients.
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Affiliation(s)
- Brandon Hage
- Department of Psychiatry and Behavioral Neurosciences, Stritch School of Medicine, Loyola University Chicago, Maywood, IL, United States
| | - Briana Britton
- Department of Psychiatry and Behavioral Neurosciences, Stritch School of Medicine, Loyola University Chicago, Maywood, IL, United States
| | - David Daniels
- Department of Psychiatry and Behavioral Neurosciences, Stritch School of Medicine, Loyola University Chicago, Maywood, IL, United States
| | - Keri Heilman
- Department of Psychiatry, University of North Carolina, Chapel Hill, NC, United States
| | - Stephen W Porges
- Department of Psychiatry, University of North Carolina, Chapel Hill, NC, United States.,Kinsey Institute, Indiana University Bloomington, Bloomington, IN, United States
| | - Angelos Halaris
- Department of Psychiatry and Behavioral Neurosciences, Stritch School of Medicine, Loyola University Chicago, Maywood, IL, United States
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Bourla A, Ferreri F, Ogorzelec L, Guinchard C, Mouchabac S. [Assessment of mood disorders by passive data gathering: The concept of digital phenotype versus psychiatrist's professional culture]. Encephale 2017; 44:168-175. [PMID: 29096909 DOI: 10.1016/j.encep.2017.07.007] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2017] [Revised: 07/25/2017] [Accepted: 07/26/2017] [Indexed: 12/22/2022]
Abstract
OBJECTIVES The search for objective clinical signs is a constant practitioners' and researchers' concern in psychiatry. New technologies (embedded sensors, artificial intelligence) give an easier access to untapped information such as passive data (i.e. that do not require patient intervention). The concept of "digital phenotype" is emerging in psychiatry: a psychomotor alteration translated by accelerometer's modifications contrasting with the usual functioning of the subject, or the graphorrhea of patients presenting a manic episode which is replaced by an increase of SMS sent. Our main objective is to highlight the digital phenotype of mood disorders by means of a selective review of the literature. METHOD We conducted a selective review of the literature by querying the PubMed database until February 2017 with the terms [Computer] [Computerized] [Machine] [Automatic] [Automated] [Heart rate variability] [HRV] [actigraphy] [actimetry] [digital] [motion] [temperature] [Mood] [Bipolar] [Depression] [Depressive]. Eight hundred and forty-nine articles were submitted for evaluation, 37 articles were included. RESULTS For unipolar disorders, smartphones can diagnose depression with excellent accuracy by combining GPS and call log data. Actigraphic measurements showing daytime alteration in basal function while ECG sensors assessing variation in heart rate variability (HRV) and body temperature appear to be useful tools to diagnose a depressive episode. For bipolar disorders, systems which combine several sensors are described: MONARCA, PRIORI, SIMBA and PSYCHE. All these systems combine passive and active data on smartphones. From a synthesis of these data, a digital phenotype of the disorders is proposed based on the accelerometer and the GPS, the ECG, the body temperature, the use of the smartphone and the voice. This digital phenotype thus brings into question certain clinical paradigms in which psychiatrists evolve. CONCLUSION All these systems can be used to computerize the clinical characteristics of the various mental states studied, sometimes with greater precision than a clinician could do. Most authors recommend the use of passive data rather than active data in the context of bipolar disorders because automatically generated data reduce biases and limit the feeling of intrusion that self-questionnaires may cause. The impact of these technologies questions the psychiatrist's professional culture, defined as a specific language and a set of common values. We address issues related to these changes. Impact on psychiatrists could be important because their unity seems to be questioned due to technologies that profoundly modify the collect and process of clinical data.
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Affiliation(s)
- A Bourla
- UPMC, service de psychiatrie et de psychologie médicale des adultes, hôpital Saint-Antoine, AP-HP, 184, rue du Faubourg-Saint-Antoine, 75012 Paris, France.
| | - F Ferreri
- UPMC, service de psychiatrie et de psychologie médicale des adultes, hôpital Saint-Antoine, AP-HP, 184, rue du Faubourg-Saint-Antoine, 75012 Paris, France
| | - L Ogorzelec
- LaSA-UBFC EA3189, laboratoire de sociologie et d'anthropologie, université Bourgogne Franche-Comté, Besançon, France
| | - C Guinchard
- LaSA-UBFC EA3189, laboratoire de sociologie et d'anthropologie, université Bourgogne Franche-Comté, Besançon, France
| | - S Mouchabac
- UPMC, service de psychiatrie et de psychologie médicale des adultes, hôpital Saint-Antoine, AP-HP, 184, rue du Faubourg-Saint-Antoine, 75012 Paris, France
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Faurholt-Jepsen M, Brage S, Kessing LV, Munkholm K. State-related differences in heart rate variability in bipolar disorder. J Psychiatr Res 2017; 84:169-173. [PMID: 27743529 PMCID: PMC6200128 DOI: 10.1016/j.jpsychires.2016.10.005] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/07/2016] [Revised: 09/09/2016] [Accepted: 10/07/2016] [Indexed: 12/31/2022]
Abstract
Heart rate variability (HRV) is a validated measure of sympato-vagal balance in the autonomic nervous system. HRV appears decreased in patients with bipolar disorder (BD) compared with healthy individuals, but the extent of state-related alterations has been sparingly investigated. The present study examined differences in HRV between affective states in BD. A heart rate and movement sensor weighing 8 g collected average acceleration, heart rate and the two slowest and fastest heart beats (of the most recent 16 beats) every 30 s over a period of at least three consecutive weekdays and nights in a prospective longitudinal design from a total of 31 different affective states in 16 outpatients with BD. A proxy measure of HRV was calculated as the difference between the second-shortest and the second-longest inter-beat-interval collected during each of the epochs. Analyses were based on over 100.000 HRV data-points. In unadjusted analyses and in analyses adjusted for age, gender and heart rate, during a manic state HRV was increased by 18% compared with a depressed state (eB = 1.18, 95% CI: 1.16-1.20, p < 0.001) and increased by 17% compared with a euthymic state (eB = 1.17, 95% CI: 1.15-1.19, p < 0.001), whereas there was no difference between a depressive state and a euthymic state (eB = 0.98, 95% CI: 0.96-1.00, p = 0.12). Further inclusion of BMI as a covariate did not alter any of the associations. HRV appears to be altered in a state-dependent manner in bipolar disorder and could represent a candidate state marker. Further studies with larger sample sizes are warranted.
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Affiliation(s)
| | - Søren Brage
- MRC Epidemiology Unit, Cambridge, United Kingdom
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Faurholt-Jepsen M, Kessing LV, Munkholm K. Heart rate variability in bipolar disorder: A systematic review and meta-analysis. Neurosci Biobehav Rev 2016; 73:68-80. [PMID: 27986468 DOI: 10.1016/j.neubiorev.2016.12.007] [Citation(s) in RCA: 65] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2016] [Revised: 11/04/2016] [Accepted: 12/09/2016] [Indexed: 01/08/2023]
Abstract
BACKGROUND Heart rate variability (HRV) has been suggested reduced in bipolar disorder (BD) compared with healthy individuals (HC). This meta-analysis investigated: HRV differences in BD compared with HC, major depressive disorder or schizophrenia; HRV differences between affective states; HRV changes from mania/depression to euthymia; and HRV changes following interventions. METHODS A systematic review and meta-analysis reported according to the PRISMA guidelines was conducted. MEDLINE, Embase, PsycINFO, The Cochrane Library and Scopus were searched. A total of 15 articles comprising 2534 individuals were included. RESULTS HRV was reduced in BD compared to HC (g=-1.77, 95% CI: -2.46; -1.09, P<0.001, 10 comparisons, n=1581). More recent publication year, larger study and higher study quality were associated with a smaller difference in HRV. Large between-study heterogeneity, low study quality, and lack of consideration of confounding factors in individual studies were observed. CONCLUSIONS This first meta-analysis of HRV in BD suggests that HRV is reduced in BD compared to HC. Heterogeneity and methodological issues limit the evidence. Future studies employing strict methodology are warranted.
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Affiliation(s)
- Maria Faurholt-Jepsen
- Psychiatric Center Copenhagen, Rigshospitalet, University of Copenhgaen, Blegdamsvej 9, DK- 2100 Copenhagen, Denmark.
| | - Lars Vedel Kessing
- Psychiatric Center Copenhagen, Rigshospitalet, University of Copenhgaen, Blegdamsvej 9, DK- 2100 Copenhagen, Denmark
| | - Klaus Munkholm
- Psychiatric Center Copenhagen, Rigshospitalet, University of Copenhgaen, Blegdamsvej 9, DK- 2100 Copenhagen, Denmark
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Valenza G, Nardelli M, Lanata A, Gentili C, Bertschy G, Kosel M, Scilingo EP. Predicting Mood Changes in Bipolar Disorder Through Heartbeat Nonlinear Dynamics. IEEE J Biomed Health Inform 2016; 20:1034-1043. [DOI: 10.1109/jbhi.2016.2554546] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Abstract
OBJECTIVE Autonomic nervous system dysfunction has the potential to adversely impact general medical health and is known to exist in a number of psychiatric disorders. It reflects alterations in the function of several regions of the central nervous system. Measurement of heart rate variability provides a non-invasive tool for studying autonomic function. While the literature relating to the technical process of heart rate variability and aspects of depressive disorders has been reviewed in the past, research relating to both depressive and bipolar disorders has not been comprehensively reviewed. This paper critically considers the published research in heart rate variability in both depressive and bipolar affective disorders. METHOD A literature search using Medline, EMBASE, PsycINFO, ProQuest Psychology and references included in published literature was conducted using the following keywords: 'heart rate variability and autonomic, combined with depression, depressive disorder, bipolar, mania and sleep'. RESULTS The evidence demonstrates that, using heart rate variability measures, significant distortions of autonomic function are evident in both depressive and bipolar disorders and from most of their pharmacological treatments. CONCLUSION The autonomic dysfunction evident in both unipolar and bipolar affective disorders, and many psychotropic medications, has significant implications for our understanding of the neurophysiology of these disorders, their treatment and associated general health.
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Affiliation(s)
- Darryl Bassett
- School of Medicine, University of Notre Dame, Notre Dame, Fremantle, Western Australia; School of Psychiatry and Clinical Neurosciences, University of Western Australia, Nedlands, WA, Australia
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Chang HA, Chang CC, Kuo TBJ, Huang SY. Distinguishing bipolar II depression from unipolar major depressive disorder: Differences in heart rate variability. World J Biol Psychiatry 2016; 16:351-60. [PMID: 25800950 DOI: 10.3109/15622975.2015.1017606] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
OBJECTIVES Bipolar II (BPII) depression is commonly misdiagnosed as unipolar depression (UD); however, an objective and reliable tool to differentiate between these disorders is lacking. Whether cardiac autonomic function can be used as a biomarker to distinguish BPII from UD is unknown. METHODS We recruited 116 and 591 physically healthy patients with BPII depression and UD, respectively, and 421 healthy volunteers aged 20-65 years. Interviewer and self-reported measures of depression/anxiety severity were obtained. Cardiac autonomic function was evaluated by heart rate variability (HRV) and frequency-domain indices of HRV. RESULTS Patients with BPII depression exhibited significantly lower mean R-R intervals, variance (total HRV), low frequency (LF)-HRV, and high frequency (HF)-HRV but higher LF/HF ratio compared to those with UD. The significant differences remained after adjusting for age. Compared to the controls, the patients with BPII depression showed cardiac sympathetic excitation with reciprocal vagal impairment, whereas the UD patients showed only vagal impairment. Depression severity independently contributed to decreased HRV and vagal tone in both the patients with BPII depression and UD, but increased sympathetic tone only in those with BPII depression. CONCLUSIONS HRV may aid in the differential diagnosis of BPII depression and UD as an adjunct to diagnostic interviews.
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Affiliation(s)
- Hsin-An Chang
- Department of Psychiatry, Tri-Service General Hospital, National Defense Medical Center , Taipei , Taiwan
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Alvares GA, Quintana DS, Hickie IB, Guastella AJ. Autonomic nervous system dysfunction in psychiatric disorders and the impact of psychotropic medications: a systematic review and meta-analysis. J Psychiatry Neurosci 2016; 41:89-104. [PMID: 26447819 PMCID: PMC4764485 DOI: 10.1503/jpn.140217] [Citation(s) in RCA: 264] [Impact Index Per Article: 33.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
BACKGROUND Autonomic nervous system (ANS) dysfunction is a putative underlying mechanism for increased cardiovascular disease risk in individuals with psychiatric disorders. Previous studies suggest that this risk may be related to psychotropic medication use. In the present study we systematically reviewed and analyzed published studies of heart rate variability (HRV), measuring ANS output, to determine the effect of psychiatric illness and medication use. METHODS We searched for studies comparing HRV in physically healthy adults with a diagnosed psychiatric disorder to controls and comparing HRV pre- and post-treatment with a psychotropic medication. RESULTS In total, 140 case-control (mood, anxiety, psychosis, dependent disorders, k = 151) and 30 treatment (antidepressants, antipsychotics; k = 43) studies were included. We found that HRV was reduced in all patient groups compared to controls (Hedges g = -0.583) with a large effect for psychotic disorders (Hedges g = -0.948). Effect sizes remained highly significant for medication-free patients compared to controls across all disorders. Smaller and significant reductions in HRV were observed for specific antidepressants and antipsychotics. LIMITATIONS Study quality significantly moderated effect sizes in case-control analyses, underscoring the importance of assessing methodological quality when interpreting HRV findings. CONCLUSION Combined findings confirm substantial reductions in HRV across psychiatric disorders, and these effects remained significant even in medication-free individuals. Reductions in HRV may therefore represent a significant mechanism contributing to elevated cardiovascular risk in individuals with psychiatric disorders. The negative impact of specific medications on HRV suggest increased risk for cardiovascular disease in these groups, highlighting a need for treatment providers to consider modifiable cardiovascular risk factors to attenuate this risk.
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Affiliation(s)
| | | | | | - Adam J. Guastella
- Correspondence to: A.J. Guastella, Brain & Mind Centre, University of Sydney, 94 Mallett St, Camperdown NSW Australia;
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Abstract
Impairment on inhibitory tasks has been well documented in bipolar disorder (BD). Differences in cerebral blood flow (CBF) between BD patients and healthy comparison (HC) participants have also been reported. Few studies have examined the relationship between cognitive performance and regional CBF in this patient population. We hypothesized that group differences on an inhibitory task (the Delis-Kaplan Executive Function Scale's Color-Word Inhibition task) would be associated with differential CBF in bilateral anterior cingulate cortex (ACC), inferior parietal lobule (IPL) and dorsolateral prefrontal cortex (DLPFC) regions. Whole brain resting CBF was measured using Multiphase Pseudocontinuous Arterial Spin Labeling MR imaging for 28 euthymic BD and 36 HC participants. Total gray matter (GM) CBF was measured, and regional CBF values were extracted for each region of interest (ROI) using Freesurfer-based individual parcellations. Group, CBF, and group-by-CBF interaction were examined as predictors of inhibition performance. Groups did not differ in age, gender or education. BD patients performed significantly worse on Color-Word inhibition. There were no significant group differences in CBF in either total GM or in any ROI. There was a group by CBF interaction in the bilateral ACC, right IPL and right DLPFC such that better inhibitory performance was generally associated with higher resting state CBF in BD subjects, but not HC participants. Although CBF was not abnormal in this euthymic BD sample, results confirm previous reports of inter-episode inhibitory deficits and indicate that the perfusion-cognition relationship is different in BD compared to HC individuals.
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Abstract
Depression occurs in people of all ages across all world regions; it is the second leading cause of disability and its global burden increased by 37.5% between 1990 and 2010. Autonomic changes are often found in altered mood states and appear to be a central biological substrate linking depression to a number of physical dysfunctions. Alterations of autonomic nervous system functioning that promotes vagal withdrawal are reflected in reductions of heart rate variability (HRV) indexes. Reduced HRV characterizes emotional dysregulation, decreased psychological flexibility and defective social engagement, which in turn are linked to prefrontal cortex hypoactivity. Altogether, these pieces of evidence support the idea that HRV might represent a useful endophenotype for psychological/physical comorbidities, and its routine application should be advised to assess the efficacy of prevention/intervention therapies in a number of psychosomatic and psychiatric dysfunctions. Further research, also making use of appropriate animal models, could provide a significant support to this point of view and possibly help to identify appropriate antidepressant therapies that do not interefere with physical health.
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Affiliation(s)
- Andrea Sgoifo
- a Stress Physiology Laboratory, Department of Neuroscience , University of Parma , Parma , Italy and
| | - Luca Carnevali
- a Stress Physiology Laboratory, Department of Neuroscience , University of Parma , Parma , Italy and
| | | | - Mario Amore
- b Department of Neuroscience , Rehabilitation, Ophthalmology, Genetics, Maternal and Child Health (DINOGMI), Section of Psychiatry, University of Genova , Genova , Italy
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Chang HA, Chang CC, Tzeng NS, Kuo TBJ, Lu RB, Huang SY. Heart rate variability in unmedicated patients with bipolar disorder in the manic phase. Psychiatry Clin Neurosci 2014; 68:674-82. [PMID: 24612182 DOI: 10.1111/pcn.12178] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/25/2013] [Revised: 01/29/2014] [Accepted: 02/18/2014] [Indexed: 12/14/2022]
Abstract
AIMS Decreased heart rate variability (HRV) has been proposed in bipolar disorder. To date, there has been no adequate study that has investigated resting HRV in unmedicated patients with bipolar disorder in the manic state. METHODS To examine whether bipolar mania is associated with decreased HRV, 61 unmedicated patients with bipolar mania and 183 healthy volunteers aged 20-65 years were recruited for this case-control analysis. The Young Mania Rating Scale (YMRS), Clinical Global Impression-Severity, Hamilton Depression Rating Scale (HAM-D), and Hamilton Anxiety Rating Scale (HAM-A) were used for the clinical ratings. Cardiac autonomic function was evaluated by measuring HRV parameters and the frequency-domain indices of HRV were obtained. RESULTS Patients with bipolar mania exhibited significantly lower mean RR interval, variance, low-frequency (LF)-HRV, and high-frequency (HF)-HRV but higher LF/HF compared to controls. Decreased HRV (variance) was associated with the YMRS total scores. Both the YMRS total scores and the Clinical Global Impression-Severity scores were positively correlated with the LH/HF ratio and inversely correlated with the HF-HRV. There was no significant correlation between the HAM-D/HAM-A scores and any HRV parameter. CONCLUSIONS Bipolar mania is associated with cardiac autonomic dysregulation, highlighting the importance of assessing HRV in manic patients. Further studies examining the influence of anti-manic psychotropic drugs on cardiac autonomic regulation in bipolar mania are needed.
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Affiliation(s)
- Hsin-An Chang
- Department of Psychiatry, Tri-Service General Hospital, Taipei, Taiwan
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Outhred T, Kemp AH, Malhi GS. Physiological Correlates of Bipolar Spectrum Disorders and their Treatment. Curr Top Behav Neurosci 2014; 21:47-102. [PMID: 24844679 DOI: 10.1007/7854_2014_297] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Bipolar spectrum disorders (BSDs) are associated with great personal and socioeconomic burden, with patients often facing a delay in detection, misdiagnosis when detected, and a trial-and-error approach to finding the most appropriate treatment. Therefore, improvement in the assessment and management of patients with BSDs is critical. Should valid physiological measures for BSDs be identified and implemented, significant clinical improvements are likely to be realized. This chapter reviews the physiological correlates of BSDs and treatment, and in doing so, examines the neuroimaging, electroencephalogram, and event-related potential, and peripheral physiological correlates that both characterize and differentiate BSDs and their response to treatment. Key correlates of BSDs involve underlying disturbances in prefrontal and limbic network neural activity, early neural processing, and within the autonomic nervous system. These changes appear to be mood-related and can be normalized with treatment. We adopt an "embodied" perspective and propose a novel, working framework that takes into account embodied psychophysiological mechanisms in which the physiological correlates of BSD are integrated. This approach may in time provide the objective physiological measures needed to improve assessment and decision making when treating patients with BSDs. Future research with integrative, multimodal measures is likely to yield potential applications for physiological measures of BSD that correlate closely with diagnosis and treatment.
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Affiliation(s)
- Tim Outhred
- Discipline of Psychiatry, Sydney Medical School, University of Sydney, Royal North Shore Hospital, Sydney, NSW, 2065, Australia
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The relationship between mental and physical health: Insights from the study of heart rate variability. Int J Psychophysiol 2013; 89:288-96. [DOI: 10.1016/j.ijpsycho.2013.06.018] [Citation(s) in RCA: 327] [Impact Index Per Article: 29.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2013] [Revised: 06/06/2013] [Accepted: 06/13/2013] [Indexed: 01/18/2023]
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