1
|
Tang PC, Millar J, Noly PE, Sicim H, Likosky DS, Zhang M, Pagani FD. Preoperative passive venous pressure-driven cardiac function determines left ventricular assist device outcomes. J Thorac Cardiovasc Surg 2024; 168:133-144.e5. [PMID: 37495169 PMCID: PMC10805966 DOI: 10.1016/j.jtcvs.2023.07.019] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/10/2023] [Revised: 06/22/2023] [Accepted: 07/16/2023] [Indexed: 07/28/2023]
Abstract
BACKGROUND Right heart output in heart failure can be compensated through increasing systemic venous pressure. We determined whether the magnitude of this "passive cardiac output" can predict LVAD outcomes. METHODS This was a retrospective review of 383 patients who received a continuous-flow LVAD at the University of Michigan between 2012 and 2021. Pre-LVAD cardiac output driven by venous pressure was determined by dividing right atrial pressure by mean pulmonary artery pressure, multiplied by total cardiac output. Normalization to body surface area led to the passive cardiac index (PasCI). The Youden J statistic was used to identify the PasCI threshold, which predicted LVAD death by 2 years. RESULTS Increased preoperative PasCI was associated with reduced survival (hazard ratio [HR], 2.27; P < .01), and increased risk of right ventricular failure (RVF) (HR, 3.46; P = .04). Youden analysis showed that a preoperative PasCI ≥0.5 (n = 226) predicted LVAD death (P = .10). Patients with PasCI ≥0.5 had poorer survival (P = .02), with a trend toward more heart failure readmission days (mean, 45.09 ± 67.64 vs 35.13 ± 45.02 days; P = .084) and increased gastrointestinal bleeding (29.2% vs 20.4%; P = .052). Additionally, of the 97 patients who experienced readmissions for heart failure, those with pre-LVAD implantation PasCI ≥0.5 were more likely to have more than 1 readmission (P = .05). CONCLUSIONS Although right heart output can be augmented by raising venous pressure, this negatively impacts end-organ function and increases heart failure readmission days. Patients with a pre-LVAD PasCI ≥0.5 have worse post-LVAD survival and increased RVF. Using the PasCI metric in isolation or incorporated into a predictive model may improve the management of LVAD candidates with RV dysfunction.
Collapse
Affiliation(s)
- Paul C Tang
- Department of Cardiac Surgery, University of Michigan Frankel Cardiovascular Center, Ann Arbor, Mich; Department of Cardiovascular Surgery, Mayo Clinic, Rochester, Minn.
| | - Jessica Millar
- Department of Surgery, University of Michigan Ann Arbor, Mich
| | | | - Hüseyin Sicim
- Department of Cardiac Surgery, University of Michigan Frankel Cardiovascular Center, Ann Arbor, Mich
| | - Donald S Likosky
- Department of Cardiac Surgery, University of Michigan Frankel Cardiovascular Center, Ann Arbor, Mich
| | - Min Zhang
- Department of Biostatistics, School of Public Health, University of Michigan, Ann Arbor, Mich
| | - Francis D Pagani
- Department of Cardiac Surgery, University of Michigan Frankel Cardiovascular Center, Ann Arbor, Mich
| |
Collapse
|
2
|
Kratz T, Dauvergne J, Ruff R, Koch T, Breuer J, Asfour B, Herberg U, Bierbach B. In a porcine model of implantable pacemakers for pediatric unilateral diaphragm paralysis, the phrenic nerve is the best target. J Cardiothorac Surg 2024; 19:181. [PMID: 38580985 PMCID: PMC10996242 DOI: 10.1186/s13019-024-02707-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2023] [Accepted: 03/30/2024] [Indexed: 04/07/2024] Open
Abstract
BACKGROUND A frequent complication of Fontan operations is unilateral diaphragmatic paresis, which leads to hemodynamic deterioration of the Fontan circulation. A potential new therapeutic option is the unilateral diaphragmatic pacemaker. In this study, we investigated the most effective stimulation location for a potential fully implantable system in a porcine model. METHODS Five pigs (20.8 ± 0.95 kg) underwent implantation of a customized cuff electrode placed around the right phrenic nerve. A bipolar myocardial pacing electrode was sutured adjacent to the motor point and peripherally at the costophrenic angle (peripheral diaphragmatic muscle). The electrodes were stimulated 30 times per minute with a pulse duration of 200 µs and a stimulation time of 300 ms. Current intensity was the only variable changed during the experiment. RESULTS Effective stimulation occurred at 0.26 ± 0.024 mA at the phrenic nerve and 7 ± 1.22 mA at the motor point, a significant difference in amperage (p = 0.005). Even with a maximum stimulation of 10 mA at the peripheral diaphragm muscle, however, no effective stimulation was observed. CONCLUSION The phrenic nerve seems to be the best location for direct stimulation by a unilateral thoracic diaphragm pacemaker in terms of the required amperage level in a porcine model.
Collapse
Affiliation(s)
- Tobias Kratz
- Department of Paediatric Cardiology, University Hospital Bonn, Venusberg-Campus 1, 53127, Bonn, Germany.
| | - Jan Dauvergne
- Department of Paediatric Cardiology, University Hospital Bonn, Venusberg-Campus 1, 53127, Bonn, Germany
| | - Roman Ruff
- Fraunhofer IBMT, Institute for Biomedical Engineering, Sulzbach, Germany
| | - Timo Koch
- Fraunhofer IBMT, Institute for Biomedical Engineering, Sulzbach, Germany
| | - Johannes Breuer
- Department of Paediatric Cardiology, University Hospital Bonn, Venusberg-Campus 1, 53127, Bonn, Germany
| | - Boulos Asfour
- Department of Pediatric Cardiac Surgery, University Hospital Bonn, Bonn, Germany
| | - Ulrike Herberg
- Department of Paediatric Cardiology, University Hospital Bonn, Venusberg-Campus 1, 53127, Bonn, Germany
- Department of Pediatric Cardiology, University Hospital Aachen, Aachen, Germany
| | - Benjamin Bierbach
- Department of Pediatric Cardiac Surgery, University Hospital Bonn, Bonn, Germany
| |
Collapse
|
3
|
Kratz T, Gaukstern L, Wiebe W, Müller N, Freudenthal N, Breuer J, Luetkens J, Hart C. Pulmonary blood flow in children with univentricular heart and unilateral diaphragmatic paralysis. INTERDISCIPLINARY CARDIOVASCULAR AND THORACIC SURGERY 2024; 38:ivae011. [PMID: 38216538 PMCID: PMC10809914 DOI: 10.1093/icvts/ivae011] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/22/2023] [Revised: 11/29/2023] [Accepted: 01/10/2024] [Indexed: 01/14/2024]
Abstract
OBJECTIVES Spontaneous breathing has an important effect on pulmonary arterial blood flow in patients with Glenn/Fontan circulation. Unilateral diaphragmatic paralysis (DP) is a frequent complication after heart surgery in congenital heart disease. The aim of this study was to investigate the influence of unilateral DP on blood flow distribution in the pulmonary arteries with Glenn/Fontan circulation. METHODS Magnetic resonance phase-contrast imaging was used to evaluate stroke volume index (SVI) in the left and right pulmonary arteries in patients with Glenn/Fontan circulation with unilateral DP. Data for 18 patients with univentricular heart and unilateral DP were analysed, 8 in the Glenn stage and 10 in the Fontan stage. Ten patients had right-sided DP, and 8 had left-sided DP. A diaphragmatic plication was performed in 7 patients. The control group consisted of 36 patients with Glenn (n = 16)/Fontan (n = 20) circulation without DP. RESULTS In both left- and right-sided DP, the SVI to the ipsilateral side was significantly lower than in controls [2.81 (1.45-4.50) ml/m2 left vs 11.97 (7.36-16.37) ml/m2 in controls, P < 0.0002; 8.2 (4.49-12.64) ml/m2 with right vs 12.64 (9.66-16.61) ml/m2 in controls; P = 0.0284]. The SVI to the contralateral side showed a slight but non-significant increase in the presence of unilateral DP. CONCLUSIONS Unilateral DP in patients with Glenn/Fontan circulation has a negative impact on pulmonary arterial SVI on the side of the paralysis.
Collapse
Affiliation(s)
- Tobias Kratz
- Department of Paediatric Cardiology, University Hospital Bonn, Bonn, Germany
| | - Lisa Gaukstern
- Department of Paediatric Cardiology, University Hospital Bonn, Bonn, Germany
| | - Walter Wiebe
- Department of Paediatric Cardiology, German Paediatric Heart Centre, Sankt Augustin, Germany
| | - Nicole Müller
- Department of Paediatric Cardiology, University Hospital Bonn, Bonn, Germany
| | - Noa Freudenthal
- Department of Paediatric Cardiology, University Hospital Bonn, Bonn, Germany
| | - Johannes Breuer
- Department of Paediatric Cardiology, University Hospital Bonn, Bonn, Germany
| | - Julian Luetkens
- Department of Diagnostic and Interventional Radiology, University Hospital Bonn, Bonn, Germany
| | - Christopher Hart
- Department of Paediatric Cardiology, University Hospital Bonn, Bonn, Germany
- Department of Diagnostic and Interventional Radiology, University Hospital Bonn, Bonn, Germany
| |
Collapse
|
4
|
Simsek B, Ozyuksel A, Saygi M, Bilal MS. Plication for diaphragm paralysis after paediatric cardiac surgery: a single-centre experience. Cardiol Young 2023; 33:2087-2093. [PMID: 36876638 DOI: 10.1017/s1047951123000276] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 03/07/2023]
Abstract
OBJECTIVE Diaphragm paralysis is a well-known complication following surgery for CHDs, which increases morbidity, mortality, and length of hospital stay as well as costs. Herein, we present our experience with diaphragm plication following paralysis of the phrenic nerve encountered after paediatric cardiac surgery. METHODS This study retrospectively reviewed the medical records of 23 diaphragm plications in 20 patients who underwent paediatric cardiac surgery between January 2012 and January 2022. The patients were carefully selected based on aetiology and a combination of clinical manifestation and chest imaging characteristics including chest X-ray, ultrasonography, and fluoroscopy. RESULTS Twenty-three successful plications were performed in 20 patients (15 males and 5 females) out of a total of 1938 operations performed in our centre. Mean age and body weight were 18.2 ± 17.1 months and 8.3 ± 3.7 kg, respectively. The period between the cardiac surgery and diaphragmatic plication was 18.7 ± 15.1 days. The highest incidence of diaphragm paralysis was encountered in systemic to pulmonary artery shunt patients with 7 out of 152 patients (4.6%). Any mortality was not encountered during a mean follow-up period of 4.3 ± 2.6 years. CONCLUSIONS Early results of plication of the diaphragm following phrenic nerve palsy in symptomatic patients who underwent paediatric cardiac surgery are encouraging. Evaluation of the diaphragmatic function should be a routine part of post-operative echocardiography. Diaphragm paralysis may be a consequence of dissection, contusion, stretching, and thermal injury both in terms of hypothermia and hyperthermia.
Collapse
Affiliation(s)
- Baran Simsek
- Department of Cardiovascular Surgery, Medicana International Hospital, Istanbul, Turkey
| | - Arda Ozyuksel
- Department of Cardiovascular Surgery, Medicana International Hospital, Istanbul, Turkey
- Department of Cardiovascular Surgery, Biruni University, Istanbul, Turkey
| | - Murat Saygi
- Department of Pediatric Cardiology, Medicana International Hospital, Istanbul, Turkey
| | - Mehmet Salih Bilal
- Department of Cardiovascular Surgery, Medicana International Hospital, Istanbul, Turkey
| |
Collapse
|
5
|
Kratz T, Ruff R, Bernhardt M, Katzer D, Herberg U, Asfour B, Breuer J, Oetzmann von Sochaczewski C, Bierbach B. A porcine model of postoperative hemi-diaphragmatic paresis to evaluate a unilateral diaphragmatic pacemaker. Sci Rep 2023; 13:12628. [PMID: 37537216 PMCID: PMC10400610 DOI: 10.1038/s41598-023-39468-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2023] [Accepted: 07/26/2023] [Indexed: 08/05/2023] Open
Abstract
Unilateral phrenic nerve damage is a dreaded complication in congenital heart surgery. It has deleterious effects in neonates and children with uni-ventricular circulation. Diaphragmatic palsy, caused by phrenic nerve damage, impairs respiratory function, especially in new-borns, because their respiration depends on diaphragmatic contractions. Furthermore, Fontan patients with passive pulmonary perfusion are seriously affected by phrenic nerve injury, because diaphragmatic contraction augments pulmonary blood flow. Diaphragmatic plication is currently employed to ameliorate the negative effects of diaphragmatic palsy on pulmonary perfusion and respiratory mechanics. This procedure attenuates pulmonary compression by the abdominal contents. However, there is no contraction of the plicated diaphragm and consequently no contribution to the pulmonary blood flow. Hence, we developed a porcine model of unilateral diaphragmatic palsy in order to evaluate a diaphragmatic pacemaker. Our illustrated step-by-step description of the model generation enables others to replicate and use our model for future studies. Thereby, it might contribute to investigation and advancement of potential improvements for these patients.
Collapse
Affiliation(s)
- Tobias Kratz
- Department of Paediatric Cardiology, University Hospital Bonn, Bonn, Germany
| | - Roman Ruff
- Fraunhofer IBMT, Institute for Biomedical Engineering, Sulzbach, Germany
| | - Marit Bernhardt
- Institute of Pathology, University Hospital Bonn, Bonn, Germany
| | - David Katzer
- Department of Paediatrics, University Hospital Bonn, Bonn, Germany
| | - Ulrike Herberg
- Department of Paediatric Cardiology, University Hospital Bonn, Bonn, Germany
- Department of Paediatric Cardiology, University Hospital Aachen, Aachen, Germany
| | - Boulos Asfour
- Department of Paediatric Cardiac Surgery, University Hospital Bonn, Bonn, Germany
| | - Johannes Breuer
- Department of Paediatric Cardiology, University Hospital Bonn, Bonn, Germany
| | | | - Benjamin Bierbach
- Department of Paediatric Cardiac Surgery, University Hospital Bonn, Bonn, Germany
| |
Collapse
|
6
|
Kratz T, Ruff R, Koch T, Kronberg AS, Breuer J, Asfour B, Herberg U, Bierbach B. Proof of concept of an accelerometer as a trigger for unilateral diaphragmatic pacing: a porcine model. Biomed Eng Online 2023; 22:55. [PMID: 37254164 DOI: 10.1186/s12938-023-01119-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2023] [Accepted: 05/19/2023] [Indexed: 06/01/2023] Open
Abstract
BACKGROUND Unilateral diaphragmatic paralysis in patients with univentricular heart is a known complication after pediatric cardiac surgery. Because diaphragmatic excursion has a significant influence on perfusion of the pulmonary arteries and hemodynamics in these patients, unilateral loss of function leads to multiple complications. The current treatment of choice, diaphragmatic plication, does not lead to a full return of function. A unilateral diaphragmatic pacemaker has shown potential as a new treatment option. In this study, we investigated an accelerometer as a trigger for a unilateral diaphragm pacemaker (closed-loop system). METHODS Seven pigs (mean weight 20.7 ± 2.25 kg) each were implanted with a customized accelerometer on the right diaphragmatic dome. Accelerometer recordings (mV) of the diaphragmatic excursion of the right diaphragm were compared with findings using established methods (fluoroscopy [mm]; ultrasound, M-mode [cm]). For detection of the amplitude of diaphragmatic excursions, the diaphragm was stimulated with increasing amperage by a cuff electrode implanted around the right phrenic nerve. RESULTS Results with the different techniques for measuring diaphragmatic excursions showed correlations between accelerometer and fluoroscopy values (correlation coefficient 0.800, P < 0.001), accelerometer and ultrasound values (0.883, P < 0.001), and fluoroscopy and ultrasound values (0.816, P < 0.001). CONCLUSION The accelerometer is a valid method for detecting diaphragmatic excursion and can be used as a trigger for a unilateral diaphragmatic pacemaker.
Collapse
Affiliation(s)
- Tobias Kratz
- Department of Pediatric Cardiology, University Hospital Bonn, Venusberg-Campus 1, 53127, Bonn, Germany.
| | - Roman Ruff
- Fraunhofer IBMT, Institute for Biomedical Engineering, Sulzbach, Germany
| | - Timo Koch
- Fraunhofer IBMT, Institute for Biomedical Engineering, Sulzbach, Germany
| | - Anne-Sophie Kronberg
- Department of Pediatric Cardiology, University Hospital Bonn, Venusberg-Campus 1, 53127, Bonn, Germany
| | - Johannes Breuer
- Department of Pediatric Cardiology, University Hospital Bonn, Venusberg-Campus 1, 53127, Bonn, Germany
| | - Boulos Asfour
- Department of Pediatric Cardiac Surgery, University Hospital Bonn, Bonn, Germany
| | - Ulrike Herberg
- Department of Pediatric Cardiology, University Hospital Bonn, Venusberg-Campus 1, 53127, Bonn, Germany
- Department of Pediatric Cardiology, University Hospital Aachen, Aachen, Germany
| | - Benjamin Bierbach
- Department of Pediatric Cardiac Surgery, University Hospital Bonn, Bonn, Germany
| |
Collapse
|
7
|
De Bruyne R, Vandekerckhove K, Van Overschelde H, Hendricx F, Vande Walle C, De Groote K, Panzer J, De Wolf D, Van Biervliet S, Bové T, François K. Non-invasive assessment of liver abnormalities in pediatric Fontan patients. Eur J Pediatr 2022; 181:159-169. [PMID: 34231051 DOI: 10.1007/s00431-021-04163-3] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/18/2021] [Revised: 06/01/2021] [Accepted: 06/11/2021] [Indexed: 12/23/2022]
Abstract
Liver abnormalities are well known among long-term survivors of Fontan palliation, which remains the definite surgery for complex congenital heart disease and single ventricle physiology. Pediatric data however are scarce. We assessed the prevalence and degree of liver abnormalities in pediatric Fontan patients through non-invasive investigations suitable for longitudinal follow-up. Thirty-five patients with a median age of 11.8 years (5.2-16.6) and median time since Fontan of 6 years (1.17-13.83) were studied. Each child underwent a blood test, liver Doppler ultrasound (US), and transient elastography (TE). Healthy children were used as controls for TE measurement. AST, ALT, γGT, and direct bilirubin were abnormal in respectively 12 (34%), 5 (14%), 24 (69%), and 7 (20%) patients, while platelet count was decreased in 7 (20%). Splenomegaly was present in 7 (20%) patients. Portal vein mean flow velocity was < 15 cm/s in 19 (54%) patients indicative of portal hypertension. Twenty-two patients (63%) showed inferior vena cava collapsibility index values below 17%, indicating venous congestion. Hepatic artery and superior mesenteric artery resistance index were inversely correlated with time post Fontan (p < 0.05). TE values in Fontan patients were significantly higher than controls, with a median of 12.6 versus 4.6 kPa (p < 0.001) and were already increased shortly after Fontan completion. Conclusion: Liver abnormalities are frequently observed in pediatric Fontan patients. The non-invasive investigations used were not able to confirm liver fibrosis or differentiate hepatic congestion from fibrosis. Based on our findings, we propose a prospective screening protocol with serial measurements of laboratory, (Doppler) US, and TE parameters. What is Known: • Hepatic dysfunction is a well-known consequence of the Fontan circulation. • The natural history of Fontan-associated liver disease in the pediatric age group remains unclear. What is New: • Liver abnormalities are frequently observed in pediatric Fontan patients; however, differentiating liver fibrosis and hepatic congestion with non-invasive investigations remains challenging. Sonographic Doppler measurements may improve our insight in both Fontan-associated liver disease development and the functioning of the Fontan circulation. • A prospective screening protocol is proposed to improve our ability to detect Fontan-associated liver disease early on and understand its natural history.
Collapse
Affiliation(s)
- Ruth De Bruyne
- Department of Pediatric Gastroenterology, Hepatology and Nutrition, Ghent University Hospital, Ghent University, Ghent, Belgium.
| | - Kristof Vandekerckhove
- Department of Pediatric Cardiology, Ghent University Hospital, Ghent University, Ghent, Belgium
| | | | - Fabian Hendricx
- Department of Pediatrics, University Hospital Brussels, Brussels, Belgium
| | | | - Katya De Groote
- Department of Pediatric Cardiology, Ghent University Hospital, Ghent University, Ghent, Belgium
| | - Joseph Panzer
- Department of Pediatric Cardiology, Ghent University Hospital, Ghent University, Ghent, Belgium
| | - Daniel De Wolf
- Department of Pediatric Cardiology, Ghent University Hospital, Ghent University, Ghent, Belgium
| | - Stephanie Van Biervliet
- Department of Pediatric Gastroenterology, Hepatology and Nutrition, Ghent University Hospital, Ghent University, Ghent, Belgium
| | - Thierry Bové
- Department of Cardiac Surgery, Ghent University Hospital, Ghent University, Ghent, Belgium
| | - Katrien François
- Department of Cardiac Surgery, Ghent University Hospital, Ghent University, Ghent, Belgium
| |
Collapse
|
8
|
Kanakis M, Martens T, Kostolny M, Petsios K, Giannopoulos N, Muthialu N. Reappraisal of lung manifestations in the setting of Fontan circulation. Asian Cardiovasc Thorac Ann 2021; 30:627-634. [PMID: 34747207 DOI: 10.1177/02184923211056711] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Fontan circulation is a well-established palliation in patients with functional single ventricles. Absence of a sub-pulmonary pumping chamber creates a unique physiology in which blood flow is mainly guided by negative intrathoracic and elevated central venous pressures. Various pulmonary anatomic or pathophysiologic changes can jeopardize optimal Fontan circulation. Long-term survival of patients who have undergone the contemporary total cavopulmonary connection is satisfactory. Thorough literature review in conjunction with accumulated clinical experience can lead clinicians to extract conclusions regarding Fontan and lung interactions indicating the purpose of this review.
Collapse
Affiliation(s)
- Meletios Kanakis
- Department of Pediatric and Congenital Heart Surgery, 69106Onassis Cardiac Center, Athens, Greece
| | - Thomas Martens
- Department of Cardiac Surgery, 54498Ghent University Hospital, Gent, Belgium
| | - Martin Kostolny
- Cardiothoracic Unit, 4956Great Ormond Street Hospital for Children, London, UK.,Slovak Medical University, Bratislava, Slovakia
| | - Konstantinos Petsios
- Department of Pediatric and Congenital Heart Surgery, 69106Onassis Cardiac Center, Athens, Greece
| | - Nicholas Giannopoulos
- Department of Pediatric and Congenital Heart Surgery, 69106Onassis Cardiac Center, Athens, Greece
| | - Nagarajan Muthialu
- Cardiothoracic Unit, 4956Great Ormond Street Hospital for Children, London, UK
| |
Collapse
|
9
|
van der Woude SFS, Rijnberg FM, Hazekamp MG, Jongbloed MRM, Kenjeres S, Lamb HJ, Westenberg JJM, Roest AAW, Wentzel JJ. The Influence of Respiration on Blood Flow in the Fontan Circulation: Insights for Imaging-Based Clinical Evaluation of the Total Cavopulmonary Connection. Front Cardiovasc Med 2021; 8:683849. [PMID: 34422920 PMCID: PMC8374887 DOI: 10.3389/fcvm.2021.683849] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2021] [Accepted: 07/05/2021] [Indexed: 12/18/2022] Open
Abstract
Congenital heart disease is the most common birth defect and functionally univentricular heart defects represent the most severe end of this spectrum. The Fontan circulation provides an unique solution for single ventricle patients, by connecting both caval veins directly to the pulmonary arteries. As a result, the pulmonary circulation in Fontan palliated patients is characterized by a passive, low-energy circulation that depends on increased systemic venous pressure to drive blood toward the lungs. The absence of a subpulmonary ventricle led to the widely believed concept that respiration, by sucking blood to the pulmonary circulation during inspiration, is of great importance as a driving force for antegrade blood flow in Fontan patients. However, recent studies show that respiration influences pulsatility, but has a limited effect on net forward flow in the Fontan circulation. Importantly, since MRI examination is recommended every 2 years in Fontan patients, clinicians should be aware that most conventional MRI flow sequences do not capture the pulsatility of the blood flow as a result of the respiration. In this review, the unique flow dynamics influenced by the cardiac and respiratory cycle at multiple locations within the Fontan circulation is discussed. The impact of (not) incorporating respiration in different MRI flow sequences on the interpretation of clinical flow parameters will be covered. Finally, the influence of incorporating respiration in advanced computational fluid dynamic modeling will be outlined.
Collapse
Affiliation(s)
- Séline F S van der Woude
- Department of Cardiology, Biomedical Engineering, Biomechanics Laboratory, Rotterdam, Netherlands
| | - Friso M Rijnberg
- Department of Cardiothoracic Surgery, Leiden University Medical Center, Leiden, Netherlands
| | - Mark G Hazekamp
- Department of Cardiothoracic Surgery, Leiden University Medical Center, Leiden, Netherlands
| | - Monique R M Jongbloed
- Department of Anatomy, Embryology and Cardiology, Leiden University Medical Center, Leiden, Netherlands
| | - Sasa Kenjeres
- Department of Chemical Engineering, Faculty of Applied Sciences, Delft University of Technology and J. M. Burgerscentrum Research School for Fluid Mechanics, Delft, Netherlands
| | - Hildo J Lamb
- Department of Radiology, Leiden University Medical Center, Leiden, Netherlands
| | - Jos J M Westenberg
- Department of Radiology, Leiden University Medical Center, Leiden, Netherlands
| | - Arno A W Roest
- Department of Pediatric Cardiology, Leiden University Medical Center, Leiden, Netherlands
| | - Jolanda J Wentzel
- Department of Cardiology, Biomedical Engineering, Biomechanics Laboratory, Rotterdam, Netherlands
| |
Collapse
|
10
|
RochéRodríguez M, DiNardo JA. The Lymphatic System in the Fontan Patient-Pathophysiology, Imaging, and Interventions: What the Anesthesiologist Should Know. J Cardiothorac Vasc Anesth 2021; 36:2669-2678. [PMID: 34446325 DOI: 10.1053/j.jvca.2021.07.049] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/12/2021] [Accepted: 07/28/2021] [Indexed: 01/30/2023]
Abstract
The Fontan surgery was developed as a palliative intervention for congenital heart disease (CHD) patients with single-ventricle physiology who are not candidates for a biventricular repair. Improvements in the surgery and medical management of these patients have increased survival, yet this population remains at risk for complications and end-organ dysfunction due to Fontan failure. Lymphatic vessels maintain a fluid balance within the extracellular space, participate in fat reabsorption from the small intestine, and play an important role in the body's immune response. Altered Starling forces at the capillary level, capillary leak, and lymphatic obstruction contribute to lymphatic dysfunction in patients with Fontan physiology. These lymphatic complications include edema, pleural effusions, plastic bronchitis (PB), and protein-losing enteropathy (PLE). Over the past decade, there have been innovations in lymphatic imaging. These new imaging techniques include noncontrast magnetic resonance (MR) lymphangiography, intranodal lymphangiography (IL), dynamic contrast-enhanced magnetic resonance lymphangiography (DCMRL), and liver lymphangiography. These imaging techniques help in delineating anatomy and guiding the appropriate therapeutic approach. Lymphatic interventions then may be performed to decompress the lymphatic system or to identify and occlude abnormal lymphatic vessels and drainage pathways. The anesthesiologist should have an understanding of the effects of lymphatic disorders on the Fontan circulation and apply appropriate management techniques for the associated interventions. The Fontan surgery was developed as a palliative intervention for CHD patients with single-ventricle physiology who are not candidates for a biventricular repair. The surgery creates a series systemic and pulmonary circulation with the energy necessary to provide gradient-driven pulmonary blood flow generated by the ventricle.1 In the past decades, improvements in the surgery and medical management of these patients have increased survival, with 30-year survival rates close to 85%.2 Despite these improvements, this population remains at risk for complications and end-organ dysfunction due to Fontan failure, which is characterized by elevated systemic venous pressures and low cardiac output. These complications include arrhythmias, cardiac dysfunction, ascites, liver fibrosis/cirrhosis, renal dysfunction, pulmonary failure, and lymphatic complications such as edema, pleural effusions, PB, and PLE. Complications ultimately contribute to increased risk for hospitalization, death, and need for heart transplantation.3,4 For this reason, there has been increasing interest in the role of abnormal lymphatic circulation in the genesis of Fontan failure. The authors characterize the lymphatic pathophysiology associated with Fontan physiology and review the imaging and interventional strategies used to treat these patients.
Collapse
Affiliation(s)
- Maricarmen RochéRodríguez
- Division of Cardiac Anesthesia, Department of Anesthesiology, Critical Care and Pain Medicine, Boston Children's Hospital, Harvard Medical School, Boston, MA.
| | - James A DiNardo
- Division of Cardiac Anesthesia, Department of Anesthesiology, Critical Care and Pain Medicine, Boston Children's Hospital, Harvard Medical School, Boston, MA
| |
Collapse
|
11
|
Jacobs JP, Fraser CD, Tweddell JS, Jacobs ML. Commentary: The challenge of postoperative diaphragmatic paralysis in patients with functionally univentricular circulation: A data-driven strategy. J Thorac Cardiovasc Surg 2020; 160:1297-1299. [PMID: 32900478 DOI: 10.1016/j.jtcvs.2020.07.003] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/02/2020] [Revised: 07/02/2020] [Accepted: 07/02/2020] [Indexed: 11/25/2022]
Affiliation(s)
- Jeffrey P Jacobs
- Division of Thoracic and Cardiovascular Surgery, Department of Surgery, Congenital Heart Center, University of Florida, Gainesville, Fla.
| | - Charles D Fraser
- Department of Surgery, University of Pennsylvania, Philadelphia, Pa; Department of Surgery, Johns Hopkins University School of Medicine, Baltimore, Md
| | - James S Tweddell
- Department of Cardiothoracic Surgery, Heart Institute, Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio
| | - Marshall L Jacobs
- Department of Surgery, Johns Hopkins University School of Medicine, Baltimore, Md
| |
Collapse
|
12
|
Kumar SR, Bainiwal J, Cleveland JD, Pike N, Wells WJ, Starnes VA. Impact of prior diaphragm plication on subsequent stages of single ventricle palliation. J Thorac Cardiovasc Surg 2020; 160:1291-1296.e1. [PMID: 32713630 DOI: 10.1016/j.jtcvs.2020.06.007] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/01/2016] [Revised: 06/11/2020] [Accepted: 06/13/2020] [Indexed: 11/25/2022]
Abstract
BACKGROUND Phrenic nerve injury is a known cause of morbidity after single ventricle palliation. Previous studies have shown that hemidiaphragm plication improves short-term outcomes. The effect of plication on the outcomes of subsequent stages of single ventricle palliation is unknown. METHODS From 1997 to 2015, 1146 patients underwent surgical management of single ventricle physiology at our institution. We reviewed the records of 30 patients who had undergone diaphragm plication for phrenic nerve injury before Fontan completion. Each patient was compared with 2 propensity-matched controls identified from patients who underwent the Glenn or Fontan procedure during the same period without diaphragm plication. Propensity matching was achieved for each test subject using the nearest neighbor algorithm. Data are presented as the median and quartiles or numbers and percentages. RESULTS The cohort included 18 boys (60%). Of the 30 patients, 19 (63%) had undergone plication after first-stage palliation. Of these, 13 have undergone completion Fontan, 5 were awaiting Fontan at the last follow-up, and 1 had died. An additional 11 patients had undergone plication after Glenn and proceeded to Fontan completion. Thus, 24 patients with diaphragm plication have undergone Fontan completion. No difference was found in pulmonary pressure or resistance between the plicated patients and their propensity-matched controls. Both groups had comparable chest tube output and hospital lengths of stay. Equal proportions of patients in both groups required pulmonary vasodilator therapy and/or supplemental oxygen at hospital discharge. CONCLUSIONS Prior diaphragm plication does not adversely affect Fontan completion in children with single ventricle physiology. The hospital course during subsequent stages of palliation for plicated patients was no different than that of matched controls.
Collapse
Affiliation(s)
- S Ram Kumar
- Heart Institute, Children's Hospital Los Angeles, Los Angeles, Calif; Department of Surgery, University of Southern California, Los Angeles, Calif; Department of Pediatrics, University of Southern California, Los Angeles, Calif.
| | - Jassimran Bainiwal
- Heart Institute, Children's Hospital Los Angeles, Los Angeles, Calif; Department of Surgery, University of Southern California, Los Angeles, Calif
| | - John D Cleveland
- Heart Institute, Children's Hospital Los Angeles, Los Angeles, Calif; Department of Surgery, University of Southern California, Los Angeles, Calif
| | - Nancy Pike
- Heart Institute, Children's Hospital Los Angeles, Los Angeles, Calif
| | - Winfield J Wells
- Heart Institute, Children's Hospital Los Angeles, Los Angeles, Calif; Department of Surgery, University of Southern California, Los Angeles, Calif
| | - Vaughn A Starnes
- Heart Institute, Children's Hospital Los Angeles, Los Angeles, Calif; Department of Surgery, University of Southern California, Los Angeles, Calif
| |
Collapse
|
13
|
Charla P, Karur GR, Yamamura K, Yoo SJ, Granton JT, Oechslin EN, Shah A, Benson LN, Honjo O, Mertens L, Alonso-Gonzalez R, Hanneman K, Wald RM. Augmentation of pulmonary blood flow and cardiac output by non-invasive external ventilation late after Fontan palliation. Heart 2020; 107:142-149. [PMID: 32748799 PMCID: PMC7788264 DOI: 10.1136/heartjnl-2020-316613] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/03/2020] [Revised: 05/20/2020] [Accepted: 05/26/2020] [Indexed: 11/10/2022] Open
Abstract
Objectives Although a life-preserving surgery for children with single ventricle physiology, the Fontan palliation is associated with striking morbidity and mortality with advancing age. Our primary objective was to evaluate the impact of non-invasive, external, thoraco-abdominal ventilation on pulmonary blood flow (PBF) and cardiac output (CO) as measured by cardiovascular magnetic resonance (CMR) imaging in adult Fontan subjects. Methods Adults with a dominant left ventricle post-Fontan palliation (lateral tunnel or extracardiac connections) and healthy controls matched by sex and age were studied. We evaluated vascular flows using phase-contrast CMR imaging during unassisted breathing, negative pressure ventilation (NPV) and biphasic ventilation (BPV). Measurements were made within target vessels (aorta, pulmonary arteries, vena cavae and Fontan circuit) at baseline and during each ventilation mode. Results Ten Fontan subjects (50% male, 24.5 years (IQR 20.8–34.0)) and 10 matched controls were studied. Changes in PBF and CO, respectively, were greater following BPV as compared with NPV. In subjects during NPV, PBF increased by 8% (Δ0.20 L/min/m2 (0.10–0.53), p=0.011) while CO did not change significantly (Δ0.17 L/min/m2 (−0.11–0.23), p=0.432); during BPV, PBF increased by 25% (Δ0.61 L/min/m2 (0.20–0.84), p=0.002) and CO increased by 16% (Δ0.47 L/min/m2 (0.21–0.71), p=0.010). Following BPV, change in PBF and CO were both significantly higher in subjects versus controls (0.61 L/min/m2 (0.2–0.84) vs −0.27 L/min/m2 (−0.55–0.13), p=0.001; and 0.47 L/min/m2 (0.21–0.71) vs 0.07 L/min/m2 (−0.47–0.33), p=0.034, respectively). Conclusion External ventilation acutely augments PBF and CO in adult Fontan subjects. Confirmation of these findings in larger populations with longer duration of ventilation and extended follow-up will be required to determine sustainability of haemodynamic effects.
Collapse
Affiliation(s)
- Pradeepkumar Charla
- Toronto Congenital Cardiac Center for Adults, Peter Munk Cardiac Center, University of Toronto, Toronto General Hospital, Toronto, Ontario, Canada
| | - Gauri Rani Karur
- Toronto Joint Department of Medical Imaging, University of Toronto, University Health Network, Toronto, Ontario, Canada
| | - Kenichiro Yamamura
- Toronto Congenital Cardiac Center for Adults, Peter Munk Cardiac Center, University of Toronto, Toronto General Hospital, Toronto, Ontario, Canada
| | - Shi-Joon Yoo
- Department of Diagnostic Imaging, The Hospital for Sick Children, Toronto, Ontario, Canada
| | - John T Granton
- Toronto Congenital Cardiac Center for Adults, Peter Munk Cardiac Center, University of Toronto, Toronto General Hospital, Toronto, Ontario, Canada
| | - Erwin N Oechslin
- Toronto Congenital Cardiac Center for Adults, Peter Munk Cardiac Center, University of Toronto, Toronto General Hospital, Toronto, Ontario, Canada
| | - Ashish Shah
- Toronto Congenital Cardiac Center for Adults, Peter Munk Cardiac Center, University of Toronto, Toronto General Hospital, Toronto, Ontario, Canada
| | - Leland N Benson
- Division of Cardiology, The Hospital for Sick Children, Toronto, Ontario, Canada
| | - Osami Honjo
- Division of Cardiovascular Surgery, The Hospital for Sick Children, Toronto, Ontario, Canada
| | - Luc Mertens
- Division of Cardiology, The Hospital for Sick Children, Toronto, Ontario, Canada
| | - Rafael Alonso-Gonzalez
- Toronto Congenital Cardiac Center for Adults, Peter Munk Cardiac Center, University of Toronto, Toronto General Hospital, Toronto, Ontario, Canada
| | - Kate Hanneman
- Toronto Joint Department of Medical Imaging, University of Toronto, University Health Network, Toronto, Ontario, Canada
| | - Rachel M Wald
- Toronto Congenital Cardiac Center for Adults, Peter Munk Cardiac Center, University of Toronto, Toronto General Hospital, Toronto, Ontario, Canada .,Division of Cardiology, The Hospital for Sick Children, Toronto, Ontario, Canada
| |
Collapse
|
14
|
Komori M, Hoashi T, Shimada M, Kitano M, Ohuchi H, Kurosaki K, Ichikawa H. Impact of Phrenic Nerve Palsy on Late Fontan Circulation. Ann Thorac Surg 2019; 109:1897-1902. [PMID: 31733188 DOI: 10.1016/j.athoracsur.2019.09.064] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/22/2019] [Revised: 09/18/2019] [Accepted: 09/19/2019] [Indexed: 10/25/2022]
Abstract
BACKGROUND Although adverse effects of phrenic nerve palsy (PNP) on early Fontan circulation have been reported, detailed late impact remains unclear. METHODS Of 218 patients undergoing extracardiac total cavopulmonary connection between 1995 and 2008, 160 who all underwent cardiac catheter examination, spirometry, and exercise capacity testing 10 years after the operation were enrolled. The cohort was divided into 2 groups: with (N = 21) or without PNP (control group, N = 139). The patients with PNP were further divided into the recovered PNP group (n = 10) and the persistent PNP group (n = 11). All but 2 patients who developed PNP (90.9%) underwent diaphragmatic plication. There was no difference in hemodynamic indices at pre-Fontan evaluation among the three groups. RESULTS Ten years after the Fontan procedure, the averaged forced vital capacity was 81% ± 18% of predicted in the control group, 86% ± 17% in the recovered PNP group, and 56% ± 12% in the persistent PNP group (P < .001). Peak oxygen consumption was linearly correlated to the forced vital capacity (r = 0.222, P = .009). There was no significant difference in the peak oxygen consumption between groups. Significant veno-venous collaterals into the diaphragm from lower body to pulmonary vein(s) or atria more frequently developed in patients who underwent diaphragmatic plication compared with those who did not (P < .001). CONCLUSIONS Persistent PNP resulted in reduced forced vital capacity; however, its influence on exercise intolerance could not be identified. Diaphragmatic plication should be reserved for patients who experience clinically significant respiratory or hemodynamic sequelae of PNP.
Collapse
Affiliation(s)
- Motoki Komori
- Department of Pediatric Cardiovascular Surgery, National Cerebral and Cardiovascular Research Center, Suita, Osaka, Japan
| | - Takaya Hoashi
- Department of Pediatric Cardiovascular Surgery, National Cerebral and Cardiovascular Research Center, Suita, Osaka, Japan.
| | - Masatoshi Shimada
- Department of Pediatric Cardiovascular Surgery, National Cerebral and Cardiovascular Research Center, Suita, Osaka, Japan
| | - Masataka Kitano
- Department of Pediatric Cardiology, National Cerebral and Cardiovascular Research Center, Suita, Osaka, Japan
| | - Hideo Ohuchi
- Department of Pediatric Cardiology, National Cerebral and Cardiovascular Research Center, Suita, Osaka, Japan
| | - Kenichi Kurosaki
- Department of Pediatric Cardiology, National Cerebral and Cardiovascular Research Center, Suita, Osaka, Japan
| | - Hajime Ichikawa
- Department of Pediatric Cardiovascular Surgery, National Cerebral and Cardiovascular Research Center, Suita, Osaka, Japan
| |
Collapse
|
15
|
Kim TH, Yang HK, Jang HJ, Yoo SJ, Khalili K, Kim TK. Abdominal imaging findings in adult patients with Fontan circulation. Insights Imaging 2018; 9:357-367. [PMID: 29623675 PMCID: PMC5991003 DOI: 10.1007/s13244-018-0609-2] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2017] [Revised: 02/04/2018] [Accepted: 02/12/2018] [Indexed: 12/12/2022] Open
Abstract
Abstract The Fontan procedures, designed to treat paediatric patients with functional single ventricles, have markedly improved the patient’s survival into adulthood. The physiology of the Fontan circuit inevitably increases systemic venous pressure, which may lead to multi-system organ failure in the long-term follow-up. Fontan-associated liver disease (FALD) can progress to liver cirrhosis with signs of portal hypertension. Focal nodular hyperplasia-like nodules commonly develop in FALD. Imaging surveillance is often performed to monitor the progression of FALD and to detect hepatocellular carcinoma, which infrequently develops in FALD. Other abdominal abnormalities in post-Fontan patients include protein losing enteropathy and pheochromocytoma/paraganglioma. Given that these abdominal abnormalities are critical for patient management, it is important for radiologists to become familiar with the abdominal abnormalities that are common in post-Fontan patients on cross-sectional imaging. Teaching points • Fontan procedure for functional single ventricle has improved patient survival into adulthood. • Radiologists should be familiar with unique imaging findings of Fontan-associated liver disease. • Focal nodular hyperplasia-like nodules commonly develop in Fontan-associated liver disease. • Hepatocellular carcinoma, protein-losing enteropathy, pheochromocytoma/paraganglioma may develop. Electronic supplementary material The online version of this article (10.1007/s13244-018-0609-2) contains supplementary material, which is available to authorized users.
Collapse
Affiliation(s)
- Tae-Hyung Kim
- Department of Radiology, Seoul National University Hospital, 101 Daehak-ro, Jongno-gu, Seoul, 03080, South Korea.,Department of Radiology, Seoul National University College of Medicine, 103 Daehak-ro, Jongnogu, Seoul, 03080, South Korea
| | - Hyun Kyung Yang
- Department of Medical Imaging, Toronto General Hospital, 585 University Avenue, Toronto, ON, M5G 2N2, Canada
| | - Hyun-Jung Jang
- Department of Medical Imaging, Toronto General Hospital, 585 University Avenue, Toronto, ON, M5G 2N2, Canada
| | - Shi-Joon Yoo
- Department of Diagnostic Imaging, Hospital for Sick Children, 555 University Avenue, Toronto, ON, M5J2L4, Canada
| | - Korosh Khalili
- Department of Medical Imaging, Toronto General Hospital, 585 University Avenue, Toronto, ON, M5G 2N2, Canada
| | - Tae Kyoung Kim
- Department of Medical Imaging, Toronto General Hospital, 585 University Avenue, Toronto, ON, M5G 2N2, Canada.
| |
Collapse
|
16
|
Tree M, Wei ZA, Trusty PM, Raghav V, Fogel M, Maher K, Yoganathan A. Using a Novel In Vitro Fontan Model and Condition-Specific Real-Time MRI Data to Examine Hemodynamic Effects of Respiration and Exercise. Ann Biomed Eng 2018; 46:135-147. [PMID: 29067563 PMCID: PMC5756106 DOI: 10.1007/s10439-017-1943-0] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2017] [Accepted: 10/09/2017] [Indexed: 12/20/2022]
Abstract
Several studies exist modeling the Fontan connection to understand its hemodynamic ties to patient outcomes (Chopski in: Experimental and Computational Assessment of Mechanical Circulatory Assistance of a Patient-Specific Fontan Vessel Configuration. Dissertation, 2013; Khiabani et al. in J Biomech 45:2376-2381, 2012; Taylor and Figueroa in Annu Rev Biomed 11:109-134, 2009; Vukicevic et al. in ASAIO J 59:253-260, 2013). The most patient-accurate of these studies include flexible, patient-specific total cavopulmonary connections. This study improves Fontan hemodynamic modeling by validating Fontan model flexibility against a patient-specific bulk compliance value, and employing real-time phase contrast magnetic resonance flow data. The improved model was employed to acquire velocity field information under breath-held, free-breathing, and exercise conditions to investigate the effect of these conditions on clinically important Fontan hemodynamic metrics including power loss and viscous dissipation rate. The velocity data, obtained by stereoscopic particle image velocimetry, was visualized for qualitative three-dimensional flow field comparisons between the conditions. Key hemodynamic metrics were calculated from the velocity data and used to quantitatively compare the flow conditions. The data shows a multi-factorial and extremely patient-specific nature to Fontan hemodynamics.
Collapse
Affiliation(s)
- Michael Tree
- George W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, GA, USA
| | - Zhenglun Alan Wei
- Wallace H. Coulter School of Biomedical Engineering, Georgia Institute of Technology, Atlanta, GA, USA
- Institute of Computational Science and Cardiovascular Disease, Nanjing Medical University, Nanjing, China
| | - Phillip M Trusty
- Wallace H. Coulter School of Biomedical Engineering, Georgia Institute of Technology, Atlanta, GA, USA
| | - Vrishank Raghav
- Wallace H. Coulter School of Biomedical Engineering, Georgia Institute of Technology, Atlanta, GA, USA
| | - Mark Fogel
- Children's Hospital of Philadelphia, Philadelphia, PA, USA
| | - Kevin Maher
- Children's Healthcare of Atlanta, Atlanta, GA, USA
| | - Ajit Yoganathan
- Wallace H. Coulter School of Biomedical Engineering, Georgia Institute of Technology, Atlanta, GA, USA.
| |
Collapse
|
17
|
Kreutzer C, Kreutzer G. The Lymphatic System: The Achilles Heel of the Fontan-Kreutzer Circulation. World J Pediatr Congenit Heart Surg 2017; 8:613-623. [DOI: 10.1177/2150135117720685] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
In spite of excellent long term survival the Fontan Kreutzer procedure commonly presents late failure due to end-organ damage. Several advances have been described to refine single ventricle management and surgical techniques. However, very little research has been dedicated to the lymphatic circulation in the precarious Fontan hemodynamic state. The lymphatic circulation is clearly affected since there is increased lymph production, which requires to be drained at a similar or higher pressure than it is produced, commonly resulting in chronic lymphedema. Chronic lymphedema induces fibrosis and end-organ failure even in normal circulation. Diverting lymph drainage to the low-pressured systemic atrium in Fontan may represent a valid alternative for the treatment of devastating complications as protein-losing enteropathy and plastic bronchitis and may prevent or decrease the development of end-organ fibrosis or failure.
Collapse
Affiliation(s)
- Christian Kreutzer
- Division of Pediatric Cardiovascular Surgery, Hospital Universitario Austral, Pilar, Buenos Aires, Argentina
| | - Guillermo Kreutzer
- Division of Pediatric Cardiovascular Surgery, Clinica Bazterrica, Ciudad Autonoma de Buenos Aires, Buenos Aires, Argentina
| |
Collapse
|
18
|
Abstract
OBJECTIVES The objectives of this review are to discuss the mechanisms by which respiration impacts cardiovascular function and vice versa, with an emphasis on the impact of these interactions in pediatric cardiac critical care. DATA SOURCE A search of MEDLINE was conducted using PubMed. CONCLUSIONS In the presence of underlying cardiac and respiratory disease, the interplay between these two systems is significant and plays a pivotal role in the pathophysiology of acute and chronic phases of a wide spectrum of diseases. An understanding of these relationships is essential to optimizing the care of critically ill patients.
Collapse
|
19
|
Respiratory Effects on Fontan Circulation During Rest and Exercise Using Real-Time Cardiac Magnetic Resonance Imaging. Ann Thorac Surg 2016; 101:1818-25. [PMID: 26872728 DOI: 10.1016/j.athoracsur.2015.11.011] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/02/2015] [Revised: 08/25/2015] [Accepted: 11/09/2015] [Indexed: 11/21/2022]
Abstract
BACKGROUND It is known that respiration modulates cavopulmonary flows, but little data compare mean flows under breath-holding and free-breathing conditions to isolate the respiratory effects and effects of exercise on the respiratory modulation. METHODS Real-time phase-contrast magnetic resonance combined with a novel method to track respiration on the same image acquisition was used to investigate respiratory effects on Fontan caval and aortic flows under breath-holding, free-breathing, and exercise conditions. Respiratory phasicity indices that were based on beat-averaged flow were used to quantify the respiratory effect. RESULTS Flow during inspiration was substantially higher than expiration under the free-breathing and exercise conditions for both inferior vena cava (inspiration/expiration: 1.6 ± 0.5 and 1.8 ± 0.5, respectively) and superior vena cava (inspiration/expiration: 1.9 ± 0.6 and 2.6 ± 2.0, respectively). Changes from rest to exercise in the respiratory phasicity index for these vessels further showed the impact of respiration. Total systemic venous flow showed no significant statistical difference between the breath-holding and free-breathing conditions. In addition, no substantial difference was found between the descending aorta and inferior vena cava mean flows under either resting or exercise conditions. CONCLUSIONS This study demonstrated that inferior vena cava and superior vena cava flow time variance is dominated by respiratory effects, which can be detected by the respiratory phasicity index. However, the minimal respiration influence on net flow validates the routine use of breath-holding techniques to measure mean flows in Fontan patients. Moreover, the mean flows in the inferior vena cava and descending aorta are interchangeable.
Collapse
|
20
|
Control of respiration-driven retrograde flow in the subdiaphragmatic venous return of the Fontan circulation. ASAIO J 2015; 60:391-9. [PMID: 24814833 DOI: 10.1097/mat.0000000000000093] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
Abstract
Respiration influences the subdiaphragmatic venous return in the total cavopulmonary connection (TCPC) of the Fontan circulation whereby both the inferior vena cava (IVC) and hepatic vein flows can experience retrograde motion. Controlling retrograde flows could improve patient outcomes. Using a patient-specific model within a Fontan mock circulatory system with respiration, we inserted a valve into the IVC to examine its effects on local hemodynamics while varying retrograde volumes by changing vascular impedances. A bovine valved conduit reduced IVC retrograde flow to within 3% of antegrade flow in all cases. The valve closed only under conditions supporting retrograde flow and its effects on local hemodynamics increased with larger retrograde volume. Liver and TCPC pressures improved only when the valve leaflets were closed whereas cycle-averaged pressures improved only slightly (<1 mm Hg). Increased pulmonary vascular resistance raised mean circulation pressures, but the valve functioned and cardiac output improved and stabilized. Power loss across the TCPC improved by 12%-15% (p < 0.05) with a valve. The effectiveness of valve therapy is dependent on patient vascular impedance.
Collapse
|
21
|
|
22
|
Gil-Jaurena JM, Pérez-Caballero R, Pita A, González-López M. Extracardiac Fontan in apicocaval juxtaposition. Asian Cardiovasc Thorac Ann 2014; 24:178-80. [PMID: 25249659 DOI: 10.1177/0218492314553613] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Abstract
Extracardiac total cavopulmonary connection between the inferior vena cava and right pulmonary artery has become the most popular Fontan modification nowadays, yielding good results. However, certain situs anomalies along with systemic venous drainage variations give rise to an issue about the best way for extracardiac conduit routing. Three cases of apicocaval juxtaposition are described. The situs was inversus with the apex and inferior vena cava on the same side (left), whereas the superior vena cava (Glenn) was located on the right in all cases. The literature is revisited and technical options are discussed. Surgery was carried out with excellent short- and midterm results.
Collapse
Affiliation(s)
| | - Ramón Pérez-Caballero
- Pediatric Cardiac Surgery, Hospital General Universitario Gregorio, Marañón, Madrid, Spain
| | - Ana Pita
- Pediatric Cardiac Surgery, Hospital General Universitario Gregorio, Marañón, Madrid, Spain
| | - Mayte González-López
- Pediatric Cardiac Surgery, Hospital General Universitario Gregorio, Marañón, Madrid, Spain
| |
Collapse
|
23
|
Mock circulatory system of the Fontan circulation to study respiration effects on venous flow behavior. ASAIO J 2013; 59:253-60. [PMID: 23644612 DOI: 10.1097/mat.0b013e318288a2ab] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
Abstract
We describe an in vitro model of the Fontan circulation with respiration to study subdiaphragmatic venous flow behavior. The venous and arterial connections of a total cavopulmonary connection (TCPC) test section were coupled with a physical lumped parameter (LP) model of the circulation. Intrathoracic and subdiaphragmatic pressure changes associated with normal breathing were applied. This system was tuned for two patients (5 years, 0.67 m2; 10 years, 1.2 m2) to physiological values. System function was verified by comparison to the analytical model on which it was based and by consistency with published clinical measurements. Overall, subdiaphragmatic venous flow was influenced by respiration. Flow within the arteries and veins increased during inspiration but decreased during expiration, with retrograde flow in the inferior venous territories. System pressures and flows showed close agreement with the analytical LP model (p < 0.05). The ratio of the flow rates occurring during inspiration to expiration were within the clinical range of values reported elsewhere. The approach used to set up and control the model was effective and provided reasonable comparisons with clinical data.
Collapse
|
24
|
Mirabella L, Haggerty CM, Passerini T, Piccinelli M, Powell AJ, Del Nido PJ, Veneziani A, Yoganathan AP. Treatment planning for a TCPC test case: a numerical investigation under rigid and moving wall assumptions. INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN BIOMEDICAL ENGINEERING 2013; 29:197-216. [PMID: 23345252 DOI: 10.1002/cnm.2517] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/14/2012] [Revised: 08/17/2012] [Indexed: 05/29/2023]
Abstract
The hemodynamics in patients with total cavopulmonary connections (TCPC) is generally very complex and characterized by patient-to-patient variability. To better understand its effect on patients' outcome, CFD models are widely used, also to test and optimize surgical options before their implementation. These models often assume rigid geometries, despite the motion experienced by thoracic vessels that could influence the hemodynamics predictions. By improving their accuracy and expanding the range of simulated interventions, the benefit of treatment planning for patients is expected to increase. We simulate three types of intervention on a patient-specific 3D model, and compare their predicted outcome with baseline condition: a decrease in pulmonary vascular resistance obtainable with medications; a surgical revision of the connection design; the introduction of a fenestration in the TCPC wall. The simulations are performed both with rigid wall assumption and including patient-specific TCPC wall motion, reconstructed from a 4DMRI dataset. The results show the effect of each option on clinically important metrics and highlight the impact of patient-specific wall motion. The largest differences between rigid and moving wall models are observed in measures of energetic efficiency of TCPC as well as in hepatic flow distribution and transit time of seeded particles through the connection.
Collapse
Affiliation(s)
- Lucia Mirabella
- Wallace H. Coulter Department of Biomedical Engineering, Georgia Institute of Technology & Emory University, Atlanta, GA, USA
| | | | | | | | | | | | | | | |
Collapse
|
25
|
Caval flow reflects Fontan hemodynamics: quantification by magnetic resonance imaging. Clin Res Cardiol 2011; 101:133-8. [DOI: 10.1007/s00392-011-0374-4] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/08/2011] [Accepted: 10/21/2011] [Indexed: 10/15/2022]
|
26
|
Abstract
The Fontan circulation results from routing of the systemic venous blood to the pulmonary circulation without a hydraulic source of a ventricle. Although a hypertrophied right atrium was thought to be essential for this circulation, the current form of the operation has neither the right atrium nor any valves in the venous circulation that is connected to the pulmonary arteries directly. Modifications in the operative model was one of the early steps in improving outcome. Use of fenestration, staging of Fontan completion and better perioperative management have led to a significant drop in mortality rates in the current era. Despite this, there is late attrition of patients with complications such as arrhythmias, ventricular dysfunction, and unusual clinical syndromes of protein-losing enteropathy (PLE) and plastic bronchitis. Management of failing Fontan includes a detailed hemodynamic and imaging assessment to treat any correctable lesions such as obstruction within the Fontan circuit, early control of arrhythmia and maintenance of sinus rhythm, symptomatic treatment for PLE and plastic bronchitis, manipulation of systemic and pulmonary vascular resistance, and Fontan conversion of less favorable atriopulmonary connection to extra-cardiac total cavopulmonary connection with arrythmia surgery. Cardiac transplantation remains the only successful definitive palliation in the failing Fontan patients.
Collapse
Affiliation(s)
- Sachin Khambadkone
- Great Ormond Street Hospital and Institute of Child Health, London, United Kingdom
| |
Collapse
|
27
|
Dur O, DeGroff CG, Keller BB, Pekkan K. Optimization of inflow waveform phase-difference for minimized total cavopulmonary power loss. J Biomech Eng 2010; 132:031012. [PMID: 20459200 DOI: 10.1115/1.4000954] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
The Fontan operation is a palliative surgical procedure performed on children, born with congenital heart defects that have yielded only a single functioning ventricle. The total cavo-pulmonary connection (TCPC) is a common variant of the Fontan procedure, where the superior vena cava (SVC) and inferior vena cava (IVC) are routed directly into the pulmonary arteries (PA). Due to the limited pumping energy available, optimized hemodynamics, in turn, minimized power loss, inside the TCPC pathway is required for the best optimal surgical outcomes. To complement ongoing efforts to optimize the anatomical geometric design of the surgical Fontan templates, here, we focused on the characterization of power loss changes due to the temporal variations in between SVC and IVC flow waveforms. An experimentally validated pulsatile computational fluid dynamics solver is used to quantify the effect of phase-shift between SVC and IVC inflow waveforms and amplitudes on internal energy dissipation. The unsteady hemodynamics of two standard idealized TCPC geometries are presented, incorporating patient-specific real-time PC-MRI flow waveforms of "functional" Fontan patients. The effects of respiration and pulsatility on the internal energy dissipation of the TCPC pathway are analyzed. Optimization of phase-shift between caval flows is shown to lead to lower energy dissipation up to 30% in these idealized models. For physiological patient-specific caval waveforms, the power loss is reduced significantly (up to 11%) by the optimization of all three major harmonics at the same mean pathway flow (3 L/min). Thus, the hemodynamic efficiency of single ventricle circuits is influenced strongly by the caval flow waveform quality, which is regulated through respiratory dependent physiological pathways. The proposed patient-specific waveform optimization protocol may potentially inspire new therapeutic applications to aid postoperative hemodynamics and improve the well being of the Fontan patients.
Collapse
Affiliation(s)
- Onur Dur
- Department of Biomedical Engineering, Carnegie Mellon University, Pittsburgh, PA 15219, USA
| | | | | | | |
Collapse
|
28
|
Affiliation(s)
- Thomas P Graham
- Division of Pediatric Cardiology, Vanderbilt Children's Hospital, Nashville, Tennessee 37232-9119, USA.
| |
Collapse
|