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Patel N, Greene N, Guynn N, Sharma A, Toleva O, Mehta PK. Ischemia but no obstructive coronary artery disease: more than meets the eye. Climacteric 2024; 27:22-31. [PMID: 38224068 DOI: 10.1080/13697137.2023.2281933] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2023] [Accepted: 10/31/2023] [Indexed: 01/16/2024]
Abstract
Symptomatic women with angina are more likely to have ischemia with no obstructive coronary arteries (INOCA) compared to men. In both men and women, the finding of INOCA is not benign and is associated with adverse cardiovascular events, including myocardial infarction, heart failure and angina hospitalizations. Women with INOCA have more angina and a lower quality of life compared to men, but they are often falsely reassured because of a lack of obstructive coronary artery disease (CAD) and a perception of low risk. Coronary microvascular dysfunction (CMD) is a key pathophysiologic contributor to INOCA, and non-invasive imaging methods are used to detect impaired microvascular flow. Coronary vasospasm is another mechanism of INOCA, and can co-exist with CMD, but usually requires invasive coronary function testing (CFT) with provocation testing for a definitive diagnosis. In addition to traditional heart disease risk factors, inflammatory, hormonal and psychological risk factors that impact microvascular tone are implicated in INOCA. Treatment of risk factors and use of anti-atherosclerotic and anti-anginal medications offer benefit. Increasing awareness and early referral to specialized centers that focus on INOCA management can improve patient-oriented outcomes. However, large, randomized treatment trials to investigate the impact on major adverse cardiovascular events (MACE) are needed. In this focused review, we discuss the prevalence, pathophysiology, presentation, diagnosis and treatment of INOCA.
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Affiliation(s)
- N Patel
- J. Willis Hurst Internal Medicine Residency Program, Emory University, Atlanta, GA, USA
| | - N Greene
- Emory University School of Medicine, Atlanta, GA, USA
| | - N Guynn
- J. Willis Hurst Internal Medicine Residency Program, Emory University, Atlanta, GA, USA
| | - A Sharma
- Department of Internal Medicine, Grady Memorial Hospital, Atlanta, GA, USA
| | - O Toleva
- Andreas Gruentzig Cardiovascular Center, Division of Cardiology, Emory University School of Medicine, Atlanta, GA, USA
| | - P K Mehta
- Emory Women's Heart Center and Emory Clinical Cardiovascular Research Institute, Division of Cardiology, Emory University School of Medicine, Atlanta, GA, USA
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Madeira S. Unrevealing what is beyond our glance. Rev Port Cardiol 2023; 42:467-469. [PMID: 36828178 DOI: 10.1016/j.repc.2023.02.009] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2023] [Accepted: 02/20/2023] [Indexed: 02/24/2023] Open
Affiliation(s)
- Sérgio Madeira
- Unidade de Intervenção Cardiovascular do Hospital de Santa Cruz, Centro Hospitalar de Lisboa Ocidental, Carnaxide, Portugal.
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Management des chronischen Koronarsyndroms. Herz 2022; 47:472-482. [DOI: 10.1007/s00059-022-05137-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 08/15/2022] [Indexed: 11/27/2022]
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Cattaneo M, Halasz G, Cattaneo MM, Younes A, Gallino C, Sudano I, Gallino A. The Central Nervous System and Psychosocial Factors in Primary Microvascular Angina. Front Cardiovasc Med 2022; 9:896042. [PMID: 35647077 PMCID: PMC9136057 DOI: 10.3389/fcvm.2022.896042] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2022] [Accepted: 04/14/2022] [Indexed: 01/09/2023] Open
Abstract
Patients diagnosed with ischemia without obstructive coronary artery disease (INOCA) comprise the group of patients with primary microvascular angina (MVA). The pathophysiology underlying ischemia and angina is multifaceted. Differences in vascular tone, collateralization, environmental and psychosocial factors, pain thresholds, and cardiac innervation seem to contribute to clinical manifestations. There is evidence suggesting potential interactions between the clinical manifestations of MVA and non-cardiac conditions such as abnormal function of the central autonomic network (CAN) in the central nervous system (CNS), pain modulation pathways, and psychological, psychiatric, and social conditions. A few unconventional non-pharmacological and pharmacological techniques targeting these psychosocial conditions and modulating the CNS pathways have been proposed to improve symptoms and quality of life. Most of these unconventional approaches have shown encouraging results. However, these results are overall characterized by low levels of evidence both in observational studies and interventional trials. Awareness of the importance of microvascular dysfunction and MVA is gradually growing in the scientific community. Nonetheless, therapeutic success remains frustratingly low in clinical practice so far. This should promote basic and clinical research in this relevant cardiovascular field investigating, both pharmacological and non-pharmacological interventions. Standardization of definitions, clear pathophysiological-directed inclusion criteria, crossover design, adequate sample size, and mid-term follow-up through multicenter randomized trials are mandatory for future study in this field.
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Affiliation(s)
- Mattia Cattaneo
- Cardiology Department, Istituto Cardiocentro Ticino, Lugano, Switzerland
- Human Medicine Department, Università della Svizzera italiana, Lugano, Switzerland
- Cardiovascular Research Unit, Hospital of San Giovanni, Bellinzona, Switzerland
- *Correspondence: Mattia Cattaneo ;
| | - Geza Halasz
- Heart Failure Unit, Guglielmo da Saliceto Hospital, Azienda unità sanitaria locale (AUSL) Piacenza, University of Parma, Parma, Italy
| | - Magdalena Maria Cattaneo
- Human Medicine Department, Università della Svizzera italiana, Lugano, Switzerland
- Cardiovascular Research Unit, Hospital of San Giovanni, Bellinzona, Switzerland
| | - Adel Younes
- Cardiology Department, Istituto Cardiocentro Ticino, Lugano, Switzerland
| | - Camilla Gallino
- Human Medicine Department, Università della Svizzera italiana, Lugano, Switzerland
- Cardiovascular Research Unit, Hospital of San Giovanni, Bellinzona, Switzerland
| | - Isabella Sudano
- Human Medicine Department, University of Zurich, Zurich, Switzerland
- Cardiology Department, University Hospital, University Heart Center Zurich, Zurich, Switzerland
| | - Augusto Gallino
- Human Medicine Department, Università della Svizzera italiana, Lugano, Switzerland
- Cardiovascular Research Unit, Hospital of San Giovanni, Bellinzona, Switzerland
- Human Medicine Department, University of Zurich, Zurich, Switzerland
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Bekendam MT, Vermeltfoort IAC, Kop WJ, Widdershoven JW, Mommersteeg PMC. Psychological factors of suspect coronary microvascular dysfunction in patients undergoing SPECT imaging. J Nucl Cardiol 2022; 29:768-778. [PMID: 33025473 PMCID: PMC8993740 DOI: 10.1007/s12350-020-02360-5] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2020] [Accepted: 08/24/2020] [Indexed: 12/02/2022]
Abstract
BACKGROUND Patients with myocardial ischemia in the absence of obstructive coronary artery disease (CAD) often experience anginal complaints and are at risk of cardiac events. Stress-related psychological factors and acute negative emotions might play a role in these patients with suspect coronary microvascular dysfunction (CMD). METHODS AND RESULTS 295 Patients (66.9 ± 8.7 years, 46% women) undergoing myocardial perfusion single-photon-emission computed tomography (MPI-SPECT), were divided as follows: (1) a non-ischemic reference group (n = 136); (2) patients without inducible ischemia, but with a history of CAD (n = 62); (3) ischemia and documented CAD (n = 52); and (4) ischemia and suspect CMD (n = 45). These four groups were compared with regard to psychological factors and acute emotions. Results revealed no differences between the groups in psychological factors (all P > .646, all effect sizes d < .015). State sadness was higher for patients with suspect CMD (16%) versus the other groups (P = .029). The groups did not differ in the association of psychological factors or emotions with anginal complaints (all P values > .448). CONCLUSION Suspect CMD was not associated with more negative psychological factors compared to other groups. State sadness was significantly higher for patients with suspect CMD, whereas no differences in state anxiety and other psychological factors were found.
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Affiliation(s)
- Maria T Bekendam
- Center of Research on Psychology in Somatic diseases (CoRPS), Department of Medical and Clinical Psychology, Tilburg University, Warandelaan 2, P.O. Box 90153, 5000 LE, Tilburg, The Netherlands.
| | | | - Willem J Kop
- Center of Research on Psychology in Somatic diseases (CoRPS), Department of Medical and Clinical Psychology, Tilburg University, Warandelaan 2, P.O. Box 90153, 5000 LE, Tilburg, The Netherlands
| | - Jos W Widdershoven
- Center of Research on Psychology in Somatic diseases (CoRPS), Department of Medical and Clinical Psychology, Tilburg University, Warandelaan 2, P.O. Box 90153, 5000 LE, Tilburg, The Netherlands
- Department of Cardiology, Elizabeth-TweeSteden Hospital, Tilburg, The Netherlands
| | - Paula M C Mommersteeg
- Center of Research on Psychology in Somatic diseases (CoRPS), Department of Medical and Clinical Psychology, Tilburg University, Warandelaan 2, P.O. Box 90153, 5000 LE, Tilburg, The Netherlands
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Bekendam MT, Mommersteeg PMC, Kop WJ, Widdershoven JW, Vermeltfoort IAC. Anxiety and hemodynamic reactivity during cardiac stress testing: The role of gender and age in myocardial ischemia. J Nucl Cardiol 2021; 28:2581-2592. [PMID: 32112295 PMCID: PMC8709819 DOI: 10.1007/s12350-020-02079-3] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2019] [Accepted: 02/10/2020] [Indexed: 01/11/2023]
Abstract
BACKGROUND The prevalence of myocardial ischemia is associated with anxiety. State and trait anxiety are more common in younger women compared to men, and high anxiety levels could affect hemodynamic reactivity during cardiac stress testing. The aim is to examine whether anxiety plays a role in gender differences in patients ≤ 65 and > 65 years in hemodynamic reactivity and ischemia during cardiac stress testing. METHODS AND RESULTS Included were 291 patients (66.8 ± 8.7 years, 45% women) with suspect ischemia undergoing myocardial perfusion single-photon emission computed tomography (MPI-SPECT). Primary outcomes were semi-quantitative summed difference score (SDS) and summed stress score (SSS), as continuous indicators of myocardial ischemia. Analyses were stratified by age. Trait anxiety was measured using a validated questionnaire (GAD-7) and state anxiety using facial expression analyses software. Overall, trait and state anxiety were not associated with the prevalence of ischemia (N = 107, 36%). A significant interaction was found between gender and trait anxiety in women ≤ 65 years for SDS (F(1,4) = 5.73, P = .019) and SSS (F(1,10) = 6.50, P = .012). This was not found for state anxiety. CONCLUSION SDS and SSS were significantly higher in women younger than 65 years with high trait anxiety. This interaction was not found in men and women over 65 years.
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Affiliation(s)
- Maria T Bekendam
- Department of Medical and Clinical Psychology, Center of Research on Psychology in Somatic Diseases (CoRPS), Tilburg University, Warandelaan 2, P.O. Box 90153, 5037 AB, Tilburg, The Netherlands
| | - Paula M C Mommersteeg
- Department of Medical and Clinical Psychology, Center of Research on Psychology in Somatic Diseases (CoRPS), Tilburg University, Warandelaan 2, P.O. Box 90153, 5037 AB, Tilburg, The Netherlands.
| | - Willem J Kop
- Department of Medical and Clinical Psychology, Center of Research on Psychology in Somatic Diseases (CoRPS), Tilburg University, Warandelaan 2, P.O. Box 90153, 5037 AB, Tilburg, The Netherlands
| | - Jos W Widdershoven
- Department of Medical and Clinical Psychology, Center of Research on Psychology in Somatic Diseases (CoRPS), Tilburg University, Warandelaan 2, P.O. Box 90153, 5037 AB, Tilburg, The Netherlands
- Department of Cardiology, Elizabeth-TweeSteden Hospital, Tilburg, The Netherlands
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Cattaneo MM, Pravatà E, Provenzi M, Moccetti M, Kaelin A, Sudano I, Biasucci L, Gallino C, Limoni C, Calanchini C, Gallino A, Crea F, Cattaneo M. Role of the central autonomic nervous system intrinsic functional organisation and psychosocial factors in primary microvascular angina and Takotsubo syndrome. Open Heart 2020; 7:openhrt-2020-001315. [PMID: 32727853 PMCID: PMC7394146 DOI: 10.1136/openhrt-2020-001315] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/14/2020] [Revised: 06/12/2020] [Accepted: 06/15/2020] [Indexed: 11/29/2022] Open
Abstract
Introduction and objective Dysfunctional central autonomic nervous system network (CAN) at rest may result in aberrant autonomic responses to psychosocial stressors. We hypothesised that patients with primary microvascular angina (MVA) or Takotsubo syndrome (TTS) would exhibit a peculiar functional organisation of the CAN, potentially associated with psychological patterns. Methods Patients underwent a psychosocial evaluation: a clinical diagnostic interview, Millon Clinical Multiaxial Inventory III, State-Trait Anxiety Inventory form Y and Short Form 36 Health Survey (SF-36). The strength of intrinsic functional connectivity (FC) between various nodes of the CAN was investigated using cerebral resting state functional MRI (RS-fMRI). Results We evaluated 50 (46 women) stable patients: 16 patients with MVA, 17 patients with TTS and 17 patients with previous acute myocardial infarction (AMI). Compared with AMI, patients with MVA showed a lower (higher impairment) SF-36 Body-Pain score (p 0.046) and a higher SF-36 Mental-Health score (p 0.039). Patients with TTS showed the strongest FC between two nodes of the CAN (sympathetic midcingulate cortex and parasympathetic primary motor area) (F 6.25, p 0.005) using RS-fMRI. Conclusions The study implements an innovative collaborative research among cardiologists, neuroscientists and psychiatrists (‘Neuro-psycho-heart Team’). MVA showed a discrepancy between the highest level of self-reported body pain and the best mental health score, which might suggest a mechanism of somatisation. TTS exhibited an increased functional integration between two areas of the CAN involved in interoceptive pain awareness and negative emotional status. We implemented an innovative research collaboration among cardiologists, neuroscientists and psychiatrists. These data are hypothesis generating and suggest potential prospective investigations on pathophysiology and implementation of psychotherapy and stress-reducing techniques as therapeutic strategies. Trial registration number NCT02759341.
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Affiliation(s)
- Magdalena Maria Cattaneo
- Cardiovascular Research, Hospital of San Giovanni, Bellinzona, Switzerland .,Internal Medicine, Hospital of San Giovanni, Bellinzona, Switzerland
| | - Emanuele Pravatà
- Neuroradiology, Neurocenter of Southern Switzerland, Lugano, Switzerland
| | - Micol Provenzi
- Psychology, Psycho-Educational Center, Stabio, Switzerland
| | | | - Alain Kaelin
- Neuroradiology, Neurocenter of Southern Switzerland, Lugano, Switzerland
| | | | - Luigi Biasucci
- Cardiology, Catholic University of Sacred Heart, Rome, Italy
| | - Camilla Gallino
- Cardiovascular Research, Hospital of San Giovanni, Bellinzona, Switzerland
| | - Costanzo Limoni
- Biostatistics, University of Applied Sciences and Arts of Southern Switzerland, Lugano, Switzerland
| | - Carlo Calanchini
- Psychiatry, Hospital Malcantonese Castelrotto, Castelrotto, Switzerland
| | - Augusto Gallino
- Cardiovascular Research, Hospital of San Giovanni, Bellinzona, Switzerland.,Cardiology, University of Zurich, Zurich, Switzerland
| | - Filippo Crea
- Cardiology, Catholic University of Sacred Heart, Rome, Italy
| | - Mattia Cattaneo
- Cardiovascular Research, Hospital of San Giovanni, Bellinzona, Switzerland.,Cardiology, Cardiocentro Ticino, Lugano, Switzerland
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Knuuti J, Wijns W, Saraste A, Capodanno D, Barbato E, Funck-Brentano C, Prescott E, Storey RF, Deaton C, Cuisset T, Agewall S, Dickstein K, Edvardsen T, Escaned J, Gersh BJ, Svitil P, Gilard M, Hasdai D, Hatala R, Mahfoud F, Masip J, Muneretto C, Valgimigli M, Achenbach S, Bax JJ. 2019 ESC Guidelines for the diagnosis and management of chronic coronary syndromes. Eur Heart J 2020; 41:407-477. [PMID: 31504439 DOI: 10.1093/eurheartj/ehz425] [Citation(s) in RCA: 3785] [Impact Index Per Article: 946.3] [Reference Citation Analysis] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
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Lv X, Zhao Z, Feng J, Zhu J. Effect of Tongxinluo Capsule on Patients with Syndrome X and Affective Disorder. Chin Med 2018. [DOI: 10.4236/cm.2018.92004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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Lutfi MF. Anxiety Level and Cardiac Autonomic Modulations in Coronary Artery Disease and Cardiac Syndrome X Patients. PLoS One 2017; 12:e0170086. [PMID: 28068419 PMCID: PMC5222583 DOI: 10.1371/journal.pone.0170086] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2016] [Accepted: 12/28/2016] [Indexed: 11/19/2022] Open
Abstract
BACKGROUND Anxiety and cardiac autonomic modulations (CAM) were thoroughly investigated in coronary artery disease (CAD) and cardiac syndrome X (CSX) patients worldwide, but not among Sudanese with similar pathology. AIMS To compare levels of anxiety and CAM between Sudanese patients with CSX and CAD. MATERIALS AND METHODS Anxiety was evaluated in 51 CAD and 26 CSX patients using Taylor Manifest anxiety score (TMAS) questionnaire while heart rate variability derived indices were used to assess CAM, namely natural logarithm of low frequency (LnLF), high frequency (LnHF) and LF/HF ratio (LnLF/HF). RESULTS Low anxiety levels were achieved by 6 (23.1%) and 9 (17.6%) patients with CSX and CAD respectively. High anxiety level was achieved by only one (3.8%) patient, who was suffering from CSX. TMAS was significantly higher in CSX (31.27 (21.97)) compared to CAD (21.86 (12.97), P = 0.021). However, abnormally increased anxiety was not associated with higher risk of CSX. LnLF, LnHF and LnLF/HF were comparable in CAD and CSX patients. CONCLUSION CSX and CAD patients showed comparable CAM. Although anxiety levels were higher in CSX compared to CAD, TMAS ≥ 35 failed to show significant association with CSX.
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Affiliation(s)
- Mohamed Faisal Lutfi
- Department of Physiology - Faculty of Medicine and Health Sciences - Al-Neelain University, Khartoum, Sudan
- * E-mail:
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Basara G, Baydin A, Yilmaz A, Yucel O, Erenler AK, Murat N. Investigation of anxiety levels of patients with chest pain admitted to emergency department. Turk J Emerg Med 2016; 15:168-71. [PMID: 27239621 PMCID: PMC4882195 DOI: 10.1016/j.tjem.2015.06.002] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2015] [Revised: 05/22/2015] [Accepted: 06/02/2015] [Indexed: 12/02/2022] Open
Abstract
Introduction We aimed to investigate the demographical features, anxiety levels and clinical findings of the patients admitted to our Emergency department (ED) due to chest pain. Methods Patients with chest pain older than 18 years were included into the study. Demographical features such as age, sex and education level, initial diagnosis in the ED, whether they were hospitalized or coronary intervention performed, were recorded. To determine the anxiety levels of the patients, State-trait Anxiety Inventory (STAI) was performed. Results Two-hundred and eight adult patients with chest pain were included into the study. We could not determine a relationship between STAI levels of patients according to demographical findings, however, STAI scores tended to decrease by age. Considering the education levels of the patients, it was determined that STAI scores of university graduates were higher than others. The STAI scores of patients discharged from the ED were higher than those hospitalized. When patients were compared according to whether coronary intervention (CI) was performed or not, it was determined that patients who did not require CI had higher STAI scores. When coronary lesion localization of the patients hospitalized was investigated, any relationship could not be determined. Conclusion In this study, we determined that anxiety levels of the patients with chest pain do not correlate with the severity of the disease. Higher anxiety levels of patients discharged from ED when compared to those with ACS is a challenging problem for both ED physicians and cardiologists.
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Affiliation(s)
- Gokhan Basara
- Samsun Education and Research Hospital, Emergency Department, Samsun, Turkey
| | - Ahmet Baydin
- Ondokuz Mayis University, Emergency Department, Samsun, Turkey
| | - Ahmet Yilmaz
- Samsun Training and Research Hospital, Department of Neurology, Samsun, Turkey
| | - Oguzhan Yucel
- Samsun Education and Research Hospital of Cardiology, Samsun, Turkey
| | - Ali Kemal Erenler
- Samsun Education and Research Hospital, Emergency Department, Samsun, Turkey
| | - Naci Murat
- Ondokuz Mayis University, Department of Statistics, Samsun, Turkey
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Vermeltfoort IAC, Teule GJJ, van Dijk AB, Muntinga HJ, Raijmakers PGHM. Long-term prognosis of patients with cardiac syndrome X: a review. Neth Heart J 2012; 20:365-71. [PMID: 22359248 PMCID: PMC3430766 DOI: 10.1007/s12471-012-0256-z] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
Aims Follow-up studies of patients with cardiac syndrome X (CSX) generally report good prognosis. However, some recent studies report an adverse outcome for women. Methods and results Structured literature search and meta-analysis for studies regarding prognosis of cardiac syndrome X patients. We identified 85 studies, ultimately selecting 16 for inclusion. Meta-analysis yielded a pooled major cardiac event percentage of 1.5% per 5 years and a pooled vascular event percentage of 4.8% per 5 years (n = 16 studies, n = 1694 patients). Fourteen studies reported upon the recurrence rate of angina pectoris: the pooled percentage of angina recurrence was 55% (n = 1336 patients). Conclusion The present review of recent archival literature demonstrates an overall major cardiac event rate of 1.5% per 5 years. Although this is an excellent prognosis for CSX patients, the quality of life is impaired because of the high recurrence rate of angina pectoris (55%).
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Affiliation(s)
- I A C Vermeltfoort
- Department of Nuclear Medicine, Verbeeten Institute, PO Box 90120, 5000 LA, Tilburg, the Netherlands,
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