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Abstract
Persons with Down syndrome (DS) have an increased reported incidence of pulmonary hypertension (PH). A majority of those with PH have associations with congenital heart disease (CHD) or persistent pulmonary hypertension of the newborn (PPHN); however, there are likely multifactorial contributions that include respiratory comorbidities. PH appears to be most commonly identified early in life, although respiratory challenges may contribute to a later diagnosis or even a recurrence of previously resolved PH in this population. Currently there are few large-scale, prospective, lifetime cohort studies detailing the impact PH has on the population with DS. This review will attempt to summarize the epidemiology and characteristics of PH in this population. This article will additionally review current known and probable risk factors for developing PH, review pathophysiologic mechanisms of disease in the population with DS, and evaluate current screening and management recommendations while suggesting areas for additional or ongoing clinical, translational, and basic science research.
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Affiliation(s)
- Douglas S Bush
- Department of Pediatrics, Division of Pulmonology, Icahn School of Medicine at Mount Sinai, One Gustave L. Levy Place, Box 1202B, New York, NY, 10029, USA.
| | - D Dunbar Ivy
- Department of Pediatrics, Division of Cardiology, University of Colorado School of Medicine, Aurora, CO, USA
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Hou Y, Wen L, Shu T, Dai R, Huang W. Efficacy and safety of pulmonary vasodilators in the patients with Eisenmenger syndrome: a meta-analysis of randomized controlled trials. Pulm Circ 2021; 11:20458940211015823. [PMID: 34164108 PMCID: PMC8191088 DOI: 10.1177/20458940211015823] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/13/2020] [Accepted: 03/12/2021] [Indexed: 11/16/2022] Open
Abstract
Few meta-analyses evaluated the efficacy and safety of pulmonary vasodilators in patients with Eisenmenger syndrome. Recently, some studies have reported conflicting results regarding improvements in exercise capacity. This study evaluated the efficacy and safety of pulmonary vasodilators in patients with Eisenmenger syndrome. Relevant studies were identified by searching major databases. Pooled outcomes were used to assess the efficacy and safety of pulmonary vasodilators. In total, five studies with 508 patients were included. Meta-analysis indicated that the pulmonary vasodilators reduced the mortality (odd risk (OR) = 0.35; 95% CI, 0.13 to 0.95; P = 0.04), slashed the mean pulmonary artery pressure (mean difference (MD) = -4.35 mmHg; 95% CI, -7.19 to -1.50; P = 0.003), decreased pulmonary vascular resistance index (MD = -480.08 dyn · s · cm-5 · m2; 95% CI, -753.51 to -206.64; P = 0.0006), increased the 6-min walk distance (MD = 28.38 m; 95% CI, 2.99 to 53.77; P = 0.03), and elevated the systemic oxygen saturation at rest (MD = 1.00%; 95% CI, 0.12 to 1.88; P = 0.03). Four studies reported side effects, but only two studies reported serious adverse effects which were mostly rare and curable. The present meta-analysis indicated that pulmonary vasodilators decrease mortality and improve hemodynamics and exercise capacity in patients with Eisenmenger syndrome. Overall, pulmonary vasodilators are well tolerated.
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Affiliation(s)
- Yulin Hou
- Department of Cardiology, The First Affiliated Hospital of Chongqing Medical University, Chongqing, China
| | - Li Wen
- Department of Cardiology, The First Affiliated Hospital of Chongqing Medical University, Chongqing, China
| | - Tingting Shu
- Department of Cardiology, The First Affiliated Hospital of Chongqing Medical University, Chongqing, China
| | - Rong Dai
- The First Branch, The First Affiliated Hospital of Chongqing Medical University, Chongqing, China
| | - Wei Huang
- Department of Cardiology, The First Affiliated Hospital of Chongqing Medical University, Chongqing, China
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Bush D, Galambos C, Dunbar Ivy D. Pulmonary hypertension in children with Down syndrome. Pediatr Pulmonol 2021; 56:621-629. [PMID: 32049444 DOI: 10.1002/ppul.24687] [Citation(s) in RCA: 22] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/16/2019] [Accepted: 01/23/2020] [Indexed: 12/26/2022]
Abstract
Individuals with Down syndrome (DS) have an increased risk of developing pulmonary hypertension (PH). In this review, we explore the epidemiology and clinical characteristics of PH in the population with DS and examine genetic, molecular and clinical contributions to the condition. The presence of an additional copy of chromosome 21 (trisomy 21) increases the risk of developing PH in children with DS through many mechanisms, including increased hemodynamic stress in those with congenital heart disease, hypoxemia through impaired ventilation to perfusion matching secondary to developmental lung abnormalities, pulmonary hypoplasia from pulmonary vascular endothelial dysfunction, and an increase in pulmonary vascular resistance often related to pulmonary comorbidities. We review recent studies looking at novel biomarkers that may help diagnose, predict or monitor PH in the population with DS and examine current cardiopulmonary guidelines for monitoring children with DS. Finally, we review therapeutic interventions specific to PH in individuals with DS. Contemporary work has identified exciting mechanistic pathways including the upregulation of antiangiogenic factors and interferon activity, which may lead to additional biomarkers or therapeutic opportunities. Throughout the manuscript, we identify gaps in our knowledge of the condition as it relates to the population with DS and offer suggestions for future clinical, translational, and basic science research.
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Affiliation(s)
- Douglas Bush
- Department of Pediatrics, Icahn School of Medicine at Mount Sinai, New York, New York
| | - Csaba Galambos
- Department of Pathology and Laboratory Medicine, University of Colorado School of Medicine, Aurora, Colorado
| | - David Dunbar Ivy
- Department of Pediatrics, University of Colorado School of Medicine, Aurora, Colorado
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Yonas E, Pranata R, Yamin M, Nusarintowati N, Nauli SE, Abdulgani HB, Siswanto BB. Clinical and hemodynamic effect of endothelin receptor antagonists in Eisenmenger Syndrome. Ann Pediatr Cardiol 2020; 13:309-319. [PMID: 33311919 PMCID: PMC7727915 DOI: 10.4103/apc.apc_196_19] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/29/2019] [Revised: 03/17/2020] [Accepted: 05/06/2020] [Indexed: 11/21/2022] Open
Abstract
Introduction: Endothelin receptor antagonists (ERAs) are widely accepted as a specific treatment for pulmonary arterial hypertension. Unfortunately, consensus and recommendations are lacking for the treatment of patients who suffer from pulmonary arterial hypertension and congenital heart disease, including Eisenmenger syndrome. Objective: This meta-analysis aimed to compare the effect of ERA on patients with Eisenmenger syndrome. Methods: Electronic search on PubMed (MEDLINE), EBSCO, EuropePMC, Clinicaltrials.gov, and Google Scholar was done. Studies involving the use of ERAs on Eisenmenger syndrome patients were included. There were 18 studies included. The primary outcome of interest was the 6-min walking test distance before and after exposure to ERA. Results: There were 517 patients with Eisenmenger syndrome. The subjects had Eisenmenger syndrome secondary to congenital heart disorders, with WHO functional Class ranging from Class I–IV. The follow-up ranges from a mean of 4–60 months. Seventeen studies reported a statistically significant difference between pretreatment and the posttreatment result of 6-min walking test distance. Pooled mean difference comparing pre and posttreatment values yielded an increase of 55.24 m (42.15, 68.33) P < 0.001; moderate heterogeneity I2 51% P = 0.008. Pooled mean pulmonary vascular resistance index difference comparing pre and posttreatment values yielded a decrease of 4.76 woods unit (−6.86, −2.66), P < 0.001 favoring posttreatment; low heterogeneity I2 0%, P = 0.82. Pooled mean mean pulmonary arterial pressure difference comparing pre and posttreatment values yielded a decrease of 5.40 mmHg (−7.53, −3.28), P < 0.001 favoring posttreatment, low heterogeneity I2 0%, P = 0.65. Conclusion: Implementation of ERA in Eisenmenger improves 6-min walking distance and pulmonary vascular pressure indices. Earlier administration of ERA might be beneficial, further studies are needed to assess mortality benefit of this agent.
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Affiliation(s)
- Emir Yonas
- Faculty of Medicine, Universitas YARSI, Jakarta, Indonesia
| | - Raymond Pranata
- Faculty of Medicine, Universitas Pelita Harapan, Banten, Indonesia
| | - Muhammad Yamin
- Division of Cardiology, Department of Internal Medicine, Faculty of Medicine, Universitas Indonesia/ Cipto Mangunkusumo National General Hospital, Jakarta, Indonesia
| | - Nuvi Nusarintowati
- Department of Cardiology and Vascular Medicine, Tangerang District Hospital, Tangerang. Faculty of Medicine, Universitas Indonesia, Jakarta, Indonesia
| | - Siti Elkana Nauli
- Department of Cardiology and Vascular Medicine, Tangerang District Hospital, Tangerang. Faculty of Medicine, Universitas Indonesia, Jakarta, Indonesia
| | | | - Bambang Budi Siswanto
- Department of Cardiology and Vascular Medicine, Faculty of Medicine Universitas Indonesia, National Cardiovascular Center Harapan Kita, Jakarta, Indonesia
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Gatzoulis MA, Landzberg M, Beghetti M, Berger RM, Efficace M, Gesang S, He J, Papadakis K, Pulido T, Galiè N. Evaluation of Macitentan in Patients With Eisenmenger Syndrome. Circulation 2019; 139:51-63. [PMID: 30586694 PMCID: PMC6314514 DOI: 10.1161/circulationaha.118.033575] [Citation(s) in RCA: 76] [Impact Index Per Article: 15.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
Supplemental Digital Content is available in the text. Background: Eisenmenger syndrome describes congenital heart disease-associated severe pulmonary hypertension accompanied by right-to-left shunting. The multicenter, double-blind, randomized, placebo-controlled, 16-week, phase III MAESTRO study (Macitentan in Eisenmenger Syndrome to Restore Exercise Capacity) evaluated the efficacy and safety of the endothelin receptor antagonist macitentan in patients with Eisenmenger syndrome. Methods: Patients with Eisenmenger syndrome aged ≥12 years and in World Health Organization functional class II–III were randomized 1:1 to placebo or macitentan 10 mg once daily for 16 weeks. Patients with complex cardiac defects, Down syndrome and background PAH therapy were eligible. The primary end point was change from baseline to week 16 in 6-minute walk distance. Secondary end points included change from baseline to week 16 in World Health Organization functional class. Exploratory end points included NT-proBNP (N-terminal pro-B-type natriuretic peptide) at end of treatment expressed as a percentage of baseline. In a hemodynamic substudy, exploratory end points included pulmonary vascular resistance index (PVRi) at week 16 as a percentage of baseline. Results: Two hundred twenty six patients (macitentan n=114; placebo n=112) were randomized. At baseline, 60% of patients were in World Health Organization functional class II and 27% were receiving phosphodiesterase type-5 inhibitors. At week 16, the mean change from baseline in 6-minute walk distance was 18.3 m and 19.7 m in the macitentan and placebo groups (least-squares mean difference, -4.7 m; 95% confidence limit (CL), -22.8, 13.5; P=0.612). World Health Organization functional class improved from baseline to week 16 in 8.8% and 14.3% of patients in the macitentan and placebo groups (odds ratio, 0.53; 95% CL, 0.23, 1.24). NT-proBNP levels decreased with macitentan versus placebo (ratio of geometric means, 0.80; 95% CL, 0.68, 0.94). In the hemodynamic substudy (n=39 patients), macitentan decreased PVRi compared with placebo (ratio of geometric means, 0.87; 95% CL, 0.73, 1.03). The most common adverse events with macitentan versus placebo were headache (11.4 versus 4.5%) and upper respiratory tract infection (9.6 versus 6.3%); a hemoglobin decrease from baseline of ≥2 g/dL occurred in 36.0% versus 8.9% of patients. Five patients (3 macitentan; 2 placebo) prematurely discontinued treatment and 1 patient died (macitentan group). Conclusions: Macitentan did not show superiority over placebo on the primary end point of change from baseline to week 16 in exercise capacity in patients with Eisenmenger syndrome. Clinical Trial Registration: URL: https://www.clinicaltrials.gov. Unique identifier: NCT01743001.
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Affiliation(s)
- Michael A Gatzoulis
- The Royal Brompton Hospital and National Heart & Lung Institute, Imperial College, London, United Kingdom (M.A.G.)
| | - Michael Landzberg
- The Royal Brompton Hospital and National Heart & Lung Institute, Imperial College, London, United Kingdom (M.A.G.)
| | - Maurice Beghetti
- Centre Universitaire de Cardiologie et Chirurgie Cardiaque Pédiatrique, Congenital Heart Center (CHUV et HUG) Hôpital des Enfants, University of Geneva and Lausanne, Geneva, Switzerland (M.B.)
| | - Rolf M Berger
- Center for Congenital Heart Diseases, Department of Paediatric and Congenital Cardiology, University of Groningen, University Medical Center Groningen, The Netherlands (R.M.B.)
| | | | - Sophie Gesang
- Actelion Pharmaceuticals, Allschwil, Switzerland (S.G.)
| | - Jian'guo He
- Pulmonary Vascular Diseases Department, State Key Laboratory of Cardiovascular Disease, Fuwai Hospital, National Center for Cardiovascular Diseases, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China (J.H.)
| | | | - Tomás Pulido
- Cardiopulmonary Department, Ignacio Chávez National Heart Institute, Mexico City, Mexico (T.P.)
| | - Nazzareno Galiè
- Department of Experimental, Diagnostic and Specialty Medicine-DIMES, University of Bologna, Italy (N.G.)
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Li Q, Kuang HY, Wu YH, Lu TW, Yi QJ. What is the position of pulmonary arterial hypertension-specific drug therapy in patients with Eisenmenger syndrome: A systematic review and meta-analysis. Medicine (Baltimore) 2019; 98:e15632. [PMID: 31096477 PMCID: PMC6531184 DOI: 10.1097/md.0000000000015632] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
BACKGROUND It is commonly reported a limitation of therapeutic strategy in Eisenmenger syndrome (ES) historically. This qualitative systematic review is conducted to evaluate the safety and efficacy of pulmonary arterial hypertension-specific drug therapy (PAH-SDT) for ES patients for a clinical therapeutic strategy based on evidence. METHODS PubMed, EMBASE, and the Cochrane Library databases have been systematically reviewed up to January 2019. Two reviewers independently conducted a literature search, quality evaluation, and data extraction. The occurrence of death, deterioration, and adverse events (AEs) has respectively been described as a count or percentage. Meta-analysis was conducted by Stata 15.1, and weighted mean differences (WMD) with 95% confidence intervals (CI) were recorded for continuous data. Randomized-effect model or fixed-effect model was applied according to the heterogeneity test. RESULTS Fifteen citations recruiting 456 patients associated with ES were eventually pooled, which involved 4 RCTs, 6 prospective studies, and 5 retrospective studies. Within the first year, it indicated PAH-SDT significantly ameliorated exercise capacity in 6-minute walk distance (6MWD) (I = 60.5%; WMD: 53.86 m, 95% CI [36.59, 71.13], P < .001), functional class (FC) (WMD = -0.71, 95% CI [-0.98, -0.44], P < .001) and Borg dyspnea index (WMD = -1.28, 95% CI [-1.86, -0.70], P < .001), in addition to hemodynamics, especially mean pulmonary arterial pressure by 5.70 mmHg (WMD = -5.70 mmHg, 95% CI [-8.19, -3.22], P < .001) and pulmonary vascular resistance by 4.20 wood U (WMD: -4.20, 95% CI [-7.32, -1.09], P = .008), but unsatisfactory effects in oxygen saturation at exercise (P = .747). In a prolonged medication, bosentan, a dual ERA, has been proved acting an important role in improving exercise tolerance of patients with ES (6MWD: I = 47.5%; WMD: 88.68 m, 95% CI [54.05, 123.3], P < .001; FC: I = 0.0%; WMD = -0.65, 95% CI [-1.10, -0.19], P = .006). While a nonsignificant change of 6MWD was noted in a long-term therapy of ambrisentan (P = .385). There existed rare evidence about the efficacy and safety of macitentan, phosphodiesterase-5 inhibitors (PDE5i), and prostanoids in a prolonged medication. Most AEs were recorded as mild to moderate with PAH-SDT, but about 4.3% individuals treated with endothelin receptor antagonists (ERAs) suffered from serious ones, and 3.9% suffered from death. CONCLUSIONS This systematic review and meta-analysis proved PAH-SDT as a safe and effective role in ES in an early stage. However, in a long-term treatment, bosentan has been supported for a lasting effect on exercise tolerance. A further multicenter research with a large sample about pharmacotherapy of ES is necessary.
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Affiliation(s)
- Qiang Li
- Department of Cardiology
- Ministry of Education Key Laboratory of Child Development and Disorders
- China International Science and Technology Cooperation Base of Child Development and Critical Disorders
- Chongqing Key Laboratory of Pediatrics
| | - Hong-Yu Kuang
- Department of Cardiology
- Ministry of Education Key Laboratory of Child Development and Disorders
- China International Science and Technology Cooperation Base of Child Development and Critical Disorders
- Chongqing Key Laboratory of Pediatrics
| | - Yu-Hao Wu
- Department of Cardiothoracic Surgery, Children's Hospital of Chongqing Medical University, Chongqing, China
| | - Tie-Wei Lu
- Department of Cardiology
- Ministry of Education Key Laboratory of Child Development and Disorders
- China International Science and Technology Cooperation Base of Child Development and Critical Disorders
- Chongqing Key Laboratory of Pediatrics
| | - Qi-Jian Yi
- Department of Cardiology
- Ministry of Education Key Laboratory of Child Development and Disorders
- China International Science and Technology Cooperation Base of Child Development and Critical Disorders
- Chongqing Key Laboratory of Pediatrics
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Elshafay A, Truong DH, AboElnas MM, Idrees H, Metwali HG, Vuong NL, Saad OA, Hirayama K, Huy NT. The Effect of Endothelin Receptor Antagonists in Patients with Eisenmenger Syndrome: A Systematic Review. Am J Cardiovasc Drugs 2018; 18:93-102. [PMID: 28660556 DOI: 10.1007/s40256-017-0240-5] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
INTRODUCTION The efficacy of endothelin receptor antagonists (ERAs) in the management of Eisenmenger syndrome (ES) remains controversial. The aim of this study is to systemically review the safety and effects of ERAs in improving the quality of life and basic cardiac functions of these patients. METHODS Twelve databases were searched, including PubMed, Web of Science, Scopus, Virtual Health Library, World Health Organization (WHO) Global Health Library, Google Scholar, POPLINE, Systems for Information of Grey Literature in Europe, New York Academy of Medicine, ClinicalTrials.gov, metaRegister of Controlled Trials and the WHO International Clinical Trials Registry Platform, through August 2016. We included randomized clinical trials addressing the effect of ERAs on cardiac functions in patients with ES. The quality of studies was assessed using the Cochrane Collaboration tool. RESULTS We included two trials represented by four papers, of which three papers reported the efficacy of bosentan against placebo and one paper reported the results of a combination of bosentan and sildenafil versus placebo and bosentan. One trial showed a significant effect of bosentan treatment over placebo on indexed pulmonary vascular resistance and mean pulmonary artery pressure, but a non-significant increase in 6-min walk distance and a non-significant effect on systemic pulse oximetry. The other trial reported the safe but non-significant effect of combination therapy of bosentan and sildenafil compared with bosentan and placebo. CONCLUSIONS This study demonstrated safety and improved hemodynamic effects of bosentan in ES, with a controversial effect on exercise capacity. Further randomized controlled trials with longer follow-up duration are needed to confirm these results.
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Affiliation(s)
| | - Duy Hieu Truong
- Quang Binh pharmaceutical joint-stock company, Quang Binh, 510000, Vietnam
| | | | - Hossam Idrees
- Faculty of Medicine, Assiut University, Assiut, 71515, Egypt
| | - Hatem G Metwali
- Faculty of Pharmacy, Assiut University, Assiut, 83511, Egypt
| | - Nguyen Lam Vuong
- Department of Cardiovascular Surgery, University Medical Center, Ho Chi Minh City, 80000, Vietnam
- Department of Medical statistic and Informatics, Faculty of Public Health, University of Medicine and Pharmacy, Ho Chi Minh City, 80000, Vietnam
| | | | - Kenji Hirayama
- Department of Immunogenetics, Institute of Tropical Medicine (NEKKEN), Graduate School of Biomedical Sciences, Nagasaki University, 1-12-4 Sakamoto, Nagasaki, 852-8523, Japan
| | - Nguyen Tien Huy
- Evidence Based Medicine Research Group and Faculty of Applied Sciences, Ton Duc Thang University, Ho Chi Minh City, 80000, Vietnam.
- Department of Clinical Product Development, Institute of Tropical Medicine (NEKKEN), Leading Graduate School Program, and Graduate School of Biomedical Sciences, Nagasaki University, Nagasaki, 852-8523, Japan.
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Varela DL, Teleb M, El-Mallah W. Advanced therapies for the management of adults with pulmonary arterial hypertension due to congenital heart disease: a systematic review. Open Heart 2018; 5:e000744. [PMID: 29344382 PMCID: PMC5761307 DOI: 10.1136/openhrt-2017-000744] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/03/2017] [Revised: 11/21/2017] [Accepted: 11/22/2017] [Indexed: 02/01/2023] Open
Abstract
Pulmonary arterial hypertension (PAH) secondary to congenital heart disease (CHD) is the third most common cause of PAH, and it is becoming increasingly common as improvements in the management of CHD have led to increased life expectancy for these patients. The medical management of PAH due to CHD (PAH-CHD) is largely the same as what has been used for the treatment of idiopathic PAH, though the body of literature supporting this management decision is very small. There are currently few studies available which specifically focus on the treatment of PAH-CHD. The purpose of this literature review is to compare the results of those studies that assessed the response to medical therapy among adults with PAH-CHD; studies were excluded if they focused on paediatric patients, did not include an assessment of 6 min walking distance or specifically assessed combination therapies. This review found that riociguat, bosentan, epoprostenol and sildenafil were all capable of improving functional capacity and haemodynamic parameters in patients with PAH-CHD, but whether this corresponds to an increase in mortality remains to be seen. Limitations of this review include the small sample size and variable duration of the included studies, which makes drawing direct comparisons between studies and the study drugs difficult. The lack of large, randomised double-blind clinical trials comparing different drugs head to head highlights an area that is ripe for ongoing medical research, the results of which may help shape future treatment algorithms tailored specifically for adults with PAH-CHD.
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Affiliation(s)
- Daniel L Varela
- Division of Internal Medicine, University of Colorado School of Medicine, Aurora, Colorado, USA.,Texas Tech University Health Sciences Center- El Paso Paul L. Foster School of Medicine, El Paso, Texas, USA
| | - Mohamed Teleb
- Texas Tech University Health Sciences Center- El Paso Paul L. Foster School of Medicine, El Paso, Texas, USA.,Department of Internal Medicine, University Medical Center, El Paso, Texas, USA.,Department of Cardiology, University Medical Center, El Paso, Texas, USA
| | - Wael El-Mallah
- Texas Tech University Health Sciences Center- El Paso Paul L. Foster School of Medicine, El Paso, Texas, USA.,Department of Internal Medicine, University Medical Center, El Paso, Texas, USA.,Department of Cardiology, University Medical Center, El Paso, Texas, USA.,Department of Cardiology, University of Connecticut Health Center, Farmington, Connecticut, USA
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Efficacy and safety of oral sildenafil in children with Down syndrome and pulmonary hypertension. BMC Cardiovasc Disord 2017; 17:177. [PMID: 28676038 PMCID: PMC5496590 DOI: 10.1186/s12872-017-0569-3] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2016] [Accepted: 05/15/2017] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Despite the increased risk for pulmonary hypertension in children with Down syndrome, the response to treatment with targeted therapies for pulmonary hypertension in these patients is not well characterized. The Sildenafil in Treatment-naive children, Aged 1-17 years, with pulmonary arterial hypertension (STARTS-1) trial was a dose-ranging study of the short-term efficacy and safety of oral sildenafil in children with pulmonary arterial hypertension. We assessed the safety and efficacy of oral sildenafil in children with Down syndrome and pulmonary arterial hypertension. METHODS This was a post-hoc analysis of children with Down syndrome and pulmonary arterial hypertension enrolled in the STARTS-1 trial. Mean pulmonary arterial pressure (mPAP), pulmonary vascular resistance index (PVRI), and cardiac index (CI) were assessed at baseline and following 16 weeks of treatment with sildenafil. RESULTS Of 234 patients randomized and treated in the STARTS-1 trial, 48 (20.5%) had Down syndrome. Although sildenafil produced dose-related reductions in PVRI and mPAP, compared with placebo, in non-Down syndrome patients and children developmentally able to exercise, this was not satisfactorily marked in patients with Down syndrome. The dose-related reductions in PVRI, compared with placebo, occurred in all subgroups, with the exception of the Down syndrome subgroup. Sildenafil appeared to be well tolerated in the Down syndrome subpopulation and the most frequently reported AEs were similar to those reported for the entire STARTS-1 population. CONCLUSION Sildenafil treatment for 16 weeks had no effect on PVRI or mPAP in children with Down syndrome and pulmonary arterial hypertension. The results suggest that children with Down syndrome may be less responsive to sildenafil for pulmonary arterial hypertension, but the incomplete work-up for the etiology of pulmonary arterial hypertension may have introduced a potential bias. TRIAL REGISTRATION Study received, September 8, 2005 (retrospectively registered); Study start, August 2003; ClinicalTrials.gov identifier, NCT00159913 .
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Colvin KL, Yeager ME. What people with Down Syndrome can teach us about cardiopulmonary disease. Eur Respir Rev 2017; 26:26/143/160098. [DOI: 10.1183/16000617.0098-2016] [Citation(s) in RCA: 44] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2016] [Accepted: 11/13/2016] [Indexed: 12/19/2022] Open
Abstract
Down syndrome is the most common chromosomal abnormality among live-born infants. Through full or partial trisomy of chromosome 21, Down syndrome is associated with cognitive impairment, congenital malformations (particularly cardiovascular) and dysmorphic features. Immune disturbances in Down syndrome account for an enormous disease burden ranging from quality-of-life issues (autoimmune alopecia) to more serious health issues (autoimmune thyroiditis) and life-threatening issues (leukaemia, respiratory tract infections and pulmonary hypertension). Cardiovascular and pulmonary diseases account for ∼75% of the mortality seen in persons with Down syndrome. This review summarises the cardiovascular, respiratory and immune challenges faced by individuals with Down syndrome, and the genetic underpinnings of their pathobiology. We strongly advocate increased comparative studies of cardiopulmonary disease in persons with and without Down syndrome, as we believe these will lead to new strategies to prevent and treat diseases affecting millions of people worldwide.
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Harries C, Armstrong I. A review of the management of pulmonary arterial hypertension associated with congenital heart disease. Eur J Cardiovasc Nurs 2017; 11:239-47. [DOI: 10.1016/j.ejcnurse.2010.10.001] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Monfredi O, Heward E, Griffiths L, Condliffe R, Mahadevan VS. Effect of dual pulmonary vasodilator therapy in pulmonary arterial hypertension associated with congenital heart disease: a retrospective analysis. Open Heart 2016; 3:e000399. [PMID: 27099763 PMCID: PMC4836289 DOI: 10.1136/openhrt-2016-000399] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/05/2016] [Accepted: 02/24/2016] [Indexed: 01/16/2023] Open
Abstract
BACKGROUND Patients with pulmonary arterial hypertension (PAH) are managed according to evidence-based treatment guidelines. METHODS AND RESULTS In this single-centre retrospective analysis, we examined outcomes of patients with PAH caused by congenital heart disease (PAH-CHD) with respect to exercise capacity and survival of adults treated with either bosentan or sildenafil monotherapy or bosentan-sildenafil dual therapy between January 2007 and January 2014. Of the 82 patients analysed, 29 had Down syndrome; 54 (65.8%) received bosentan monotherapy, 16 (19.5%) sildenafil monotherapy and 12 (14.6%) dual therapy. Mean treatment duration was 2.5 years for all patients and 4.1 years for 38 patients treated for ≥2 years. Pooled patient and treatment data showed initial improvement followed by stabilisation in mean 6 min walk distance (6MWD). For Down and non-Down patients, mean 6MWD increased and then stabilised on bosentan monotherapy. Mean 6MWD of patients on dual therapy at the time of analysis was 246.3 m before PAH-specific therapy initiation, 211.9 m immediately prior to addition of a second therapy and 214.4 m at last visit while on dual therapy. 1, 2 and 3-year survival rates for all patients from time of treatment initiation were 96%, 87% and 80%, respectively. CONCLUSIONS For the majority of patients, monotherapy with a PAH-specific medication provided improved and sustained exercise benefits. For the small percentage of patients who required it, add-on therapy appeared to prevent further deterioration in exercise capacity but did not improve 6MWD.
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Affiliation(s)
- Oliver Monfredi
- University of Manchester, Institute of Cardiovascular Sciences, Manchester, UK; Manchester Heart Centre, Manchester Royal Infirmary, UK; Laboratory of Cardiovascular Science, National Institute on Aging-Intramural Research Program, National Institutes of Health, Baltimore, Maryland, USA
| | - Elliot Heward
- University of Manchester, Institute of Cardiovascular Sciences , Manchester , UK
| | | | - Robin Condliffe
- Sheffield Pulmonary Vascular Disease Unit , Royal Hallamshire Hospital , Sheffield , UK
| | - Vaikom S Mahadevan
- University of Manchester, Institute of Cardiovascular Sciences, Manchester, UK; Manchester Heart Centre, Manchester Royal Infirmary, UK; Heart and Vascular Center, University of California, San Francisco, California, USA
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13
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Strange G, Rose M, Kermeen F, O'Donnell C, Keogh A, Kotlyar E, Grigg L, Bullock A, Disney P, Dwyer N, Whitford H, Tanous D, Frampton C, Weintraub R, Celermajer DS. A binational registry of adults with pulmonary arterial hypertension complicating congenital heart disease. Intern Med J 2015; 45:944-50. [DOI: 10.1111/imj.12821] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2015] [Accepted: 05/20/2015] [Indexed: 12/30/2022]
Affiliation(s)
- G. Strange
- Department of Medicine; University of Notre Dame; Perth Western Australia Australia
- Pulmonary Hypertensions Society ANZ Inc.; Sydney New South Wales Australia
- Murdoch Children's Research Institute; Melbourne Victoria Australia
| | - M. Rose
- Department of Cardiology; Royal Children's Hospital; Melbourne Victoria Australia
| | - F. Kermeen
- Department of Respiratory Medicine; The Prince Charles Hospital; Brisbane Queensland Australia
| | - C. O'Donnell
- Department of Cardiology; Auckland City Hospital; Auckland New Zealand
| | - A. Keogh
- Department of Cardiology; St Vincent's Hospital; Sydney New South Wales Australia
| | - E. Kotlyar
- Department of Cardiology; St Vincent's Hospital; Sydney New South Wales Australia
| | - L. Grigg
- Department of Cardiology; Royal Melbourne Hospital; Melbourne Victoria Australia
| | - A. Bullock
- Department of Paediatric Cardiology; Royal Perth Hospital; Perth Western Australia Australia
| | - P. Disney
- The Royal Adelaide Hospital; Adelaide South Australia Australia
| | - N. Dwyer
- Department of Cardiology; Royal Hobart Hospital; Hobart Tasmania Australia
| | - H. Whitford
- Department of Respiratory Medicine; The Alfred Hospital; Melbourne Victoria Australia
| | - D. Tanous
- Department of Cardiology; Westmead Hospital; Sydney New South Wales Australia
| | - C. Frampton
- Department of Cardiology; University of Otago; Christchurch New Zealand
| | - R. Weintraub
- Murdoch Children's Research Institute; Melbourne Victoria Australia
- Department of Cardiology; Royal Children's Hospital; Melbourne Victoria Australia
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14
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Saji T. Clinical characteristics of pulmonary arterial hypertension associated with Down syndrome. Pediatr Int 2014; 56:297-303. [PMID: 24689825 DOI: 10.1111/ped.12349] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/10/2013] [Revised: 03/13/2014] [Accepted: 03/24/2014] [Indexed: 12/31/2022]
Abstract
The genetic abnormalities associated with Down syndrome (DS) are still being identified. Few studies have examined the roles of CRELD1 and GATA4 in cardiac abnormalities or their association with pulmonary artery histopathology. Children with DS have an elevated risk of pulmonary arterial hypertension (PAH). This increased risk is likely mainly due to genetic background, the structural characteristics of the pulmonary vascular wall, and certain heart diseases and partly due to pulmonary hypoplasia, upper and lower airway obstructive diseases, chronic infection, and neuromuscular underdevelopment. Exposure to increased left-to-right shunt flow increases sheer stress on endothelium and may induce endothelial dysfunction followed by irreversible remodeling of pulmonary arteries. Pathologic changes include endothelial cell proliferation and thickening of the pulmonary arterial wall due to mechanical responses to the thinner medial smooth muscle cell layer, which includes underdevelopment of alveoli. Production of prostacyclin and nitric oxide is diminished in DS, but endothelin-1 and thromboxane are elevated. Perioperatively, patients with DS may experience pulmonary hypertensive crisis after intracardiac repair and prolonged PAH, and have a poorer response to nitric oxide inhalation. To better manage DS, it is crucial to systematically evaluate the systemic complications of DS. Cardiac catheterization data, particularly those regarding pulmonary arterial resistance, are essential in assessing severity and response to vasodilating agents, preventing postoperative crisis, and evaluating the possibility of intracardiac repair. Advanced therapy with pulmonary vasodilating agents appears effective. Operative risk is similar for individuals with and without DS, except among patients with a complete atrioventricular canal defect.
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Affiliation(s)
- Tsutomu Saji
- Department of Pediatrics, Pediatric Medical Center, Toho University Omori Medical Center, Tokyo, Japan
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15
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Radke RM, Diller GP, Baumgartner H. The challenge of managing pulmonary arterial hypertension in adults with congenital heart disease. Expert Rev Cardiovasc Ther 2014; 11:919-31. [DOI: 10.1586/14779072.2013.811966] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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16
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Crepaz R, Romeo C, Montanaro D, De Santis S. Long-term results of treatment with bosentan in adult Eisenmenger's syndrome patients with Down's syndrome related to congenital heart disease. BMC Cardiovasc Disord 2013; 13:74. [PMID: 24047157 PMCID: PMC3848635 DOI: 10.1186/1471-2261-13-74] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2013] [Accepted: 09/04/2013] [Indexed: 11/20/2022] Open
Abstract
Background Patients with Down’s syndrome and shunt lesions are at high risk of developing pulmonary arterial hypertension (PAH) earlier than patients without Down’s syndrome. However, data on the efficacy of PAH-specific therapy in patients with Down’s syndrome are limited. The aim of this retrospective analysis was to determine the long-term efficacy of the dual endothelin receptor antagonist, bosentan, in Eisenmenger's syndrome (ES) patients with Down’s syndrome. Methods In this observational study adults with Down’s syndrome with a confirmed diagnosis of ES (World Health Organization functional class III) and receiving bosentan therapy and were followed up long term. Clinical evaluation at baseline and follow-up visits included resting transcutaneous arterial oxygen saturation and laboratory assessments. Exercise capacity was evaluated using a 6-minute walk test where transcutaneous arterial oxygen saturation at peak exercise (SpO2), 6-minute walk distance (6MWD) and Borg dyspnoea index were assessed. A full echocardiographic assessment was conducted at baseline and follow-up visits. Results Overall, seven adults (mean age 29.6 ± 11.2 years; 57% male) received bosentan at a starting dose of 62.5 mg twice daily. This was increased to the target dose of 125 mg twice daily 4 weeks later. All patients remained on bosentan until the end of the study. After a mean (± standard deviation) duration of 52.2 ± 3.9 months (range: 46.0–55.5 months), 6MWD had increased from 199.6 ± 69.1 metres to 303.7 ± 99.9 metres (P < 0.05) and SpO2 at the end of the 6-minute walk test had increased from 61.6 ± 7.6% to 74.7 ± 6.2% (P < 0.05). Echocardiography demonstrated a significant change in acceleration time from 62.9 ± 11.6 m/s to 83.0 ± 9.6 m/s (P = 0.0156), and acceleration time/ejection time ratio from the pulmonary flow from 0.24 ± 0.04 at baseline to 0.30 ± 0.02 (P = 0.0156) at final follow-up. Conclusions Long-term treatment with bosentan significantly improved exercise capacity and oxygen saturation following exercise in adult ES patients with Down’s syndrome. These data confirm that the presence of Down’s syndrome does not affect the response to oral bosentan therapy.
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Affiliation(s)
- Roberto Crepaz
- Department of Cardiology and Pediatric Cardiology, Regional Hospital of Bolzano, Bolzano, Italy.
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17
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Serino G, Guazzi M, Micheletti A, Lombardi C, Danesi R, Negura D, Carminati M, Chessa M. Effect of bosentan on exercise capacity and clinical worsening in patients with dual down and eisenmenger syndrome. CLINICAL MEDICINE INSIGHTS-CARDIOLOGY 2013; 7:29-34. [PMID: 23440179 PMCID: PMC3572875 DOI: 10.4137/cmc.s10237] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
This single-center, retrospective analysis evaluated long-term bosentan treatment in adult patients (n = 7) with both Down and Eisenmenger syndromes (DS-ES). Laboratory tests, 6-minute walk distance (6MWD), functional class, and Doppler echocardiography were assessed at baseline and during 2 years' follow-up. Improvements or maintenance of 6MWD were observed (68 m improvement from baseline at month 12) after bosentan initiation. 6MWD was maintained up to year 2. Overall, 6 patients experienced a significant improvement in functional class during 2 years' therapy (P = 0.01). There were no significant changes in parameters measured by Doppler echocardiography. None of the patients required either hospitalization or additional pulmonary arterial hypertension (PAH) therapy because of PAH progression. Bosentan treatment was generally well tolerated; no liver function abnormalities or serious adverse drug reactions were noted. In this DS-ES cohort, bosentan seemed to be well tolerated and clinically effective.
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Affiliation(s)
- Giorgio Serino
- Department of Internal and Vascular Medicine, IRCCS-Policlinico, San Donato, Italy
| | - Marco Guazzi
- University of Milano, Cardiology IRCCS-Policlinico, San Donato, Italy
| | - Angelo Micheletti
- Department of Pediatric Cardiology and Adult with Congenital Heart Disease, IRCCS-Policlinico, San Donato, Italy
| | - Carlo Lombardi
- Department of Experimental and Applied Medicine, University of Brescia, Civil Hospital of Brescia, Italy
| | - Rossella Danesi
- Department of Experimental and Applied Medicine, University of Brescia, Civil Hospital of Brescia, Italy
| | - Diana Negura
- Department of Pediatric Cardiology and Adult with Congenital Heart Disease, IRCCS-Policlinico, San Donato, Italy
| | - Mario Carminati
- Department of Pediatric Cardiology and Adult with Congenital Heart Disease, IRCCS-Policlinico, San Donato, Italy
| | - Massimo Chessa
- Department of Pediatric Cardiology and Adult with Congenital Heart Disease, IRCCS-Policlinico, San Donato, Italy
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18
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Saji T. Clinical Implications of Pulmonary Hypertension associated with Down Syndrome. ACTA ACUST UNITED AC 2013. [DOI: 10.9794/jspccs.29.3] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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19
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Nir A, Luchner A, Rein AJ. The natriuretic peptides as biomarkers for adults with congenital heart disease. Biomark Med 2012; 6:827-37. [PMID: 23227849 DOI: 10.2217/bmm.12.73] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Thanks to improved treatment of congenital heart disease early in life, many such patients reach adulthood. Adults with congenital heart disease are an increasing population, which will continue to grow in the future. The clinical state of these patients is affected by their complex heart diseases, as well as the consequence of past corrective or palliative interventions. The natriuretic peptides are important markers for the presence, severity and prognosis of heart disease. The majority of the current knowledge is on patients with acquired heart disease. This article reviews the present knowledge regarding the role of the natriuretic peptides in adults with various forms of congenital heart disease.
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Affiliation(s)
- Amiram Nir
- Department of Pediatric Cardiology, Hadassah Hebrew University Medical Center, POB 12000, Jerusalem 91120, Israel.
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20
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Kopeć G, Tyrka A, Miszalski-Jamka T, Mikołajczyk T, Waligóra M, Guzik T, Podolec P. Changes in exercise capacity and cardiac performance in a series of patients with Eisenmenger's syndrome transitioned from selective to dual endothelin receptor antagonist. Heart Lung Circ 2012; 21:671-8. [PMID: 22819097 DOI: 10.1016/j.hlc.2012.06.013] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2012] [Revised: 06/18/2012] [Accepted: 06/25/2012] [Indexed: 11/19/2022]
Abstract
BACKGROUND Differences in clinical effects between selective and dual endothelin (ET) receptor antagonists (ERA) in patients with pulmonary arterial hypertension (PAH) are currently unknown. We aimed to assess prospectively how transition from selective (sitaxsentan) to dual (bosentan) ERA affected exercise capacity and cardiocirculatory performance in patients with Eisenmenger's syndrome. METHODS A series of seven stable patients with Eisenmenger's syndrome aged 40.0 (30.0-56.0) years old treated with sitaxsentan were assessed before and three months after transition to bosentan. Six minute walk test and magnetic resonance to assess LV and RV mass, volume and ejection fraction, and pulmonary flow, and laboratory tests were performed. RESULTS We observed an increase in LV mass [96.5 (66.0-116.0) vs. 123.0 (93.0-146.0)g; p=0.03], LV ejection fraction [55.0 (44.0-63.0) vs. 65.0 (58.0-70.0)%; p=0.02)], and pulmonary flow [64 (53.0-71.0) vs. 69.0 (55.0-84.0)ml/beat; p=0.046]. This was accompanied by an increase of oxygen saturation, elongation of 6MWD [435.0 (378.0-482.3) vs. 474 (405.0-534.7); p=0.02], decrease of NTproBNP level and increase of ET-1 level. CONCLUSIONS Three month follow-up of stable patients with Eisenmenger's syndrome transitioned from sitaxsentan to bosentan revealed improvement of exercise capacity despite significant elevation of ET-1 level. Concurrent increase of LV ejection fraction and pulmonary flow might have contributed to these favourable effects.
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Affiliation(s)
- Grzegorz Kopeć
- John Paul II Hospital in Krakow, Department of Cardiac and Vascular Diseases, Pradnicka 80, 31-202 Krakow, Poland.
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21
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Abstract
Down syndrome (DS) is strongly associated with pulmonary hypertension, but there are many causes requiring a multi-disciplinary approach to the problem. Nearly half of children with DS have upper airway obstruction and the same proportion have congenital heart disease, both of which may cause pulmonary hypertension. Additional problems include pulmonary hypoplasia, structural lung disease and gastro-oesophageal reflux. It is no longer acceptable to ignore these symptoms as early treatment may be preventative.
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Affiliation(s)
- P King
- Department of Congenital Heart Disease, Bristol Royal Hospital for Children, Upper Maudlin Street, Bristol, UK
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22
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Monfredi O, Griffiths L, Clarke B, Mahadevan VS. Efficacy and safety of bosentan for pulmonary arterial hypertension in adults with congenital heart disease. Am J Cardiol 2011; 108:1483-8. [PMID: 21943933 DOI: 10.1016/j.amjcard.2011.07.006] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/09/2011] [Revised: 07/05/2011] [Accepted: 07/05/2011] [Indexed: 10/17/2022]
Abstract
The dual endothelin receptor antagonist, bosentan, has been shown to be well tolerated and effective in improving pulmonary arterial hypertension (PAH) symptoms in patients with Eisenmenger syndrome but data from longer-term studies are lacking. The aim of this study was to retrospectively analyze the long-term efficacy and safety of bosentan in adults with PAH secondary to congenital heart disease (PAH-CHD). Prospectively collected data from adult patients with PAH-CHD (with and without Down syndrome) initiated on bosentan from October 2007 through June 2010 were analyzed. Parameters measured before bosentan initiation (62.5 mg 2 times/day for 4 weeks titrated to 125 mg 2 times/day) and at each follow-up (1 month and 3, 6, 9, 12, 18, and 24 months) included exercise capacity (6-minute walk distance [6MWD]), pretest oxygen saturation, liver enzymes, and hemoglobin. Data were analyzed from 39 patients with PAH-CHD (10 with Down syndrome) who had received ≥ 1 dose of bosentan (mean duration of therapy 2.1 ± 1.5 years). A significant (p < 0.0001) average improvement in 6MWD of 54 m over a 2-year period in patients with PAH-CHD without Down syndrome was observed. Men patients had a 6MWD of 33 m greater than women (p < 0.01). In all patients, oxygen saturation, liver enzymes, and hemoglobin levels remained stable. There were no discontinuations from bosentan owing to adverse events. In conclusion, patients with PAH-CHD without Down syndrome gain long-term symptomatic benefits in exercise capacity after bosentan treatment. Men seem to benefit more on bosentan treatment. Bosentan appears to be well tolerated in patients with PAH-CHD with or without Down syndrome.
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