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Christou GA, Christou MA, Davos CH, Markozannes G, Christou KA, Mantzoukas S, Christodoulou DK, Kiortsis DN, Christou PA, Tigas S, Nikoletou D. Ergophysiological evaluation of heart failure patients with reduced ejection fraction undergoing exercise-based cardiac rehabilitation: A systematic review and meta-analysis. Hellenic J Cardiol 2024:S1109-9666(24)00004-6. [PMID: 38246276 DOI: 10.1016/j.hjc.2024.01.004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2023] [Revised: 12/23/2023] [Accepted: 01/17/2024] [Indexed: 01/23/2024] Open
Abstract
BACKGROUND This systematic review and meta-analysis aims to explore in heart failure (HF) patients with reduced ejection fraction (EF) undergoing exercise-based cardiac rehabilitation the following: 1) the comparison of temporal changes between peak oxygen uptake (VO2peak) and first ventilatory threshold (VO2VT1), 2) the association of VO2peak and VO2VT1 changes with physiological factors, and 3) the differential effects of continuous aerobic exercise (CAE) and interval training (IT) on VO2peak and VO2VT1. METHODS A systematic literature search was conducted in PubMed, CENTRAL, and Scopus. Inclusion criteria were 1) original research articles using exercise-based cardiac rehabilitation, 2) stable HF patients with reduced EF, 3) available values of VO2peak and VO2VT1 (in mL/kg/min) both at baseline and after exercise training with comparison between these time points. RESULTS Among the 30 eligible trials, 24 used CAE, 5 IT, and one CAE and IT. Multivariable meta-regression with duration of exercise training and percentage of males as independent variables and the change in VO2peak as a dependent variable showed that the change in VO2peak was negatively associated with duration of exercise training (coefficient=-0.061, p=0.027), implying the possible existence of a waning effect of exercise training on VO2peak in the long term. Multivariable meta-regression demonstrated that both age (coefficient=-0.140, p<0.001) and EF (coefficient=-0.149, p<0.001) could predict the change in VO2VT1, whereas only age (coefficient=-0.095, p=0.022), but not EF (coefficient = 0.082, p = 0.100), could predict the change in VO2peak. The posttraining peak respiratory exchange ratio, as an index of maximum effort during exercise testing, correlated positively with the change in VO2peak (coefficient=-0.021, p=0.044). The exercise-induced changes of VO2peak (p = 0.438) and VO2VT1 (p = 0.474) did not differ between CAE and IT groups. CONCLUSIONS Improvement of endurance capacity during cardiac rehabilitation may be detected more accurately with the assessment of VO2VT1 rather than VO2peak.
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Affiliation(s)
- Georgios A Christou
- Laboratory of Physiology, Faculty of Medicine, University of Ioannina, Ioannina, Greece; MSc Sports Cardiology, St George's University of London, London, United Kingdom.
| | - Maria A Christou
- Department of Endocrinology, University Hospital of Ioannina, Ioannina, Greece; Department of Hygiene and Epidemiology, School of Medicine, University of Ioannina, Ioannina, Greece
| | - Constantinos H Davos
- Cardiovascular Research Laboratory, Biomedical Research Foundation, Academy of Athens, Athens, Greece
| | - Georgios Markozannes
- Department of Hygiene and Epidemiology, School of Medicine, University of Ioannina, Ioannina, Greece
| | - Konstantinos A Christou
- Department of Hygiene and Epidemiology, School of Medicine, University of Ioannina, Ioannina, Greece
| | - Stefanos Mantzoukas
- Research Laboratory of Integrated Care, Health and Well-being, Department of Nursing, School of Health Sciences, University of Ioannina, Ioannina, Greece
| | - Dimitrios K Christodoulou
- Research Laboratory of Integrated Care, Health and Well-being, Department of Nursing, School of Health Sciences, University of Ioannina, Ioannina, Greece
| | - Dimitrios N Kiortsis
- Atherothrombosis Research Centre, Faculty of Medicine, University of Ioannina, Ioannina, Greece
| | | | - Stelios Tigas
- Department of Endocrinology, University Hospital of Ioannina, Ioannina, Greece
| | - Dimitra Nikoletou
- MSc Sports Cardiology, St George's University of London, London, United Kingdom
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Christou MA, Christou PA, Kyriakopoulos C, Christou GA, Tigas S. Effects of Hypoglycemia on Cardiovascular Function in Patients with Diabetes. Int J Mol Sci 2023; 24:ijms24119357. [PMID: 37298308 DOI: 10.3390/ijms24119357] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2023] [Revised: 05/21/2023] [Accepted: 05/25/2023] [Indexed: 06/12/2023] Open
Abstract
Hypoglycemia is common in patients with type 1 and type 2 diabetes (T1D, T2D), treated with insulin or sulfonylureas, and has multiple short- and long-term clinical implications. Whether acute or recurrent, hypoglycemia significantly affects the cardiovascular system with the potential to cause cardiovascular dysfunction. Several pathophysiological mechanisms have been proposed linking hypoglycemia to increased cardiovascular risk, including hemodynamic changes, myocardial ischemia, abnormal cardiac repolarization, cardiac arrhythmias, prothrombotic and proinflammatory effects, and induction of oxidative stress. Hypoglycemia-induced changes can promote the development of endothelial dysfunction, which is an early marker of atherosclerosis. Although data from clinical trials and real-world studies suggest an association between hypoglycemia and cardiovascular events in patients with diabetes, it remains uncertain whether this association is causal. New therapeutic agents for patients with T2D do not cause hypoglycemia and have cardioprotective benefits, whereas increasing the use of new technologies, such as continuous glucose monitoring devices and insulin pumps, has the potential to reduce hypoglycemia and its adverse cardiovascular outcomes in patients with T1D.
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Affiliation(s)
- Maria A Christou
- Department of Endocrinology, University of Ioannina Faculty of Medicine, 45500 Ioannina, Greece
| | - Panagiota A Christou
- Department of Endocrinology, University of Ioannina Faculty of Medicine, 45500 Ioannina, Greece
| | - Christos Kyriakopoulos
- Department of Respiratory Medicine, University of Ioannina Faculty of Medicine, 45500 Ioannina, Greece
| | - Georgios A Christou
- Laboratory of Physiology, University of Ioannina Faculty of Medicine, 45500 Ioannina, Greece
| | - Stelios Tigas
- Department of Endocrinology, University of Ioannina Faculty of Medicine, 45500 Ioannina, Greece
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Gillies D, Christou MA, Dixon AC, Featherston OJ, Rapti I, Garcia-Anguita A, Villasis-Keever M, Reebye P, Christou E, Al Kabir N, Christou PA. Prevalence and Characteristics of Self-Harm in Adolescents: Meta-Analyses of Community-Based Studies 1990-2015. J Am Acad Child Adolesc Psychiatry 2018; 57:733-741. [PMID: 30274648 DOI: 10.1016/j.jaac.2018.06.018] [Citation(s) in RCA: 187] [Impact Index Per Article: 31.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/06/2017] [Revised: 05/26/2018] [Accepted: 06/20/2018] [Indexed: 02/07/2023]
Abstract
OBJECTIVE To provide meta-analytic estimates of self-harm from all community-based studies of adolescents from 1990 through 2015, estimates of suicidal risk, and characteristics including age profile, frequency, types, seeking help, and reasons. METHOD Databases, bibliographies, and the internet were searched for cross-sectional and cohort studies of 12- to 18-year-olds. Meta-analytic estimates of the prevalence and characteristics of self-harm, risk of suicidal behaviors, and rates comparing different methods were calculated. RESULTS One hundred seventy-two datasets reporting self-harm in 597,548 participants from 41 countries were included. Overall lifetime prevalence was 16.9% (95% CI 15.1-18.9), with rates increasing to 2015. Girls were more likely to self-harm (risk ratio 1.72, 95% CI 1.57-1.88). The mean age of starting self-harm was 13 years, with 47% reporting only 1 or 2 episodes and cutting being the most common type (45%). The most frequent reason was relief from thoughts or feelings. Slightly more than half sought help, but for most this was from a friend. Suicidal ideation (risk ratio 4.97) and attempts (risk ratio 9.14) were significantly higher in adolescents who self-harmed, but this was higher with more frequent self-harm. Methodologic factors also were associated with higher rates of self-harm. CONCLUSION Interventions that can lower suicidal risk should be made available to adolescents who self-harm frequently as soon as possible. Preventative interventions that help adolescents deal with negative feelings should be instituted at the onset of puberty. Because friends are frequently asked for support, interventions also should be developed for peer groups.
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Affiliation(s)
- Donna Gillies
- Western Sydney Local Health District, Sydney, Australia.
| | | | | | | | - Iro Rapti
- University Hospital of Ioannina, Greece
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Fousekis FS, Christou PA, Gkogkos S, Aggeli P, Pappas-Gogos G. A case of De Garengeot's hernia with acute appendicitis and literature review. Int J Surg Case Rep 2018; 49:55-57. [PMID: 29960210 PMCID: PMC6039706 DOI: 10.1016/j.ijscr.2018.06.007] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2018] [Revised: 06/08/2018] [Accepted: 06/20/2018] [Indexed: 12/27/2022] Open
Abstract
BACKGROUND De Garengeot hernia is defined as femoral hernia containing appendix. An acute appendicitis in a femoral hernia is a extremely unusual surgical finding and occurs in 0.08%-0.013% of all cases. CASE REPORT We report the case of an elderly woman, who presented with a typical clinical image of incarcerated femoral hernia and underwent open surgery. An infrainguinal incision was performed and after the dissection of hernia sac, an acute appendicitis within femoral hernia was revealed. Subsequently, appendectomy and hernioplasty were performed. CONCLUSION Acute appendicitis within femoral hernia should be included in differential diagnosis of patients presenting with clinical signs of an incarcerated femoral hernia and prompt surgical treatment is essential in order to avoid severe complications.
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Affiliation(s)
| | | | | | - Panagiota Aggeli
- Department of Gastroenterology, Filiates General Hospital, Greece.
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Christou MA, Christou PA, Markozannes G, Tsatsoulis A, Mastorakos G, Tigas S. Effects of Anabolic Androgenic Steroids on the Reproductive System of Athletes and Recreational Users: A Systematic Review and Meta-Analysis. Sports Med 2017; 47:1869-1883. [DOI: 10.1007/s40279-017-0709-z] [Citation(s) in RCA: 73] [Impact Index Per Article: 10.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
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