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Balloon Dilation Atrial Septostomy and Potts Anastomosis for Severe Pulmonary Arterial Hypertension: Why, When, and How

Julio Sandoval

Tomás Pulido

Juan Sandoval

Nayeli Zayas

Jorge Gaspar

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Vol 15, No 1 (2016)
  • Sandoval, J; et al. Balloon Dilation Atrial Septostomy and Potts Anastomosis for Severe Pulmonary Arterial Hypertension: Why, When, and How Advances in Pulmonary Hypertension.2016;15:1: 19-25.
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Without treatment, pulmonary arterial hypertension (PAH) is characterized by progressive elevation of pulmonary artery pressure, worsening right heart failure, and eventually death. Results from the National Institutes of Health Registry study in the United States1 showed that patients with a cardiac index (CI) <2.0 L/min/m2, and particularly those with mean right atrial pressure (mRAP) >20 mm Hg, had poor expectancy for survival. These findings, consistent with those shown by other studies,2 provided evidence that, indeed, survival in PAH depends on right ventricular (RV) function/dysfunction.

Currently, pharmacologic options for PAH are better; PAH-specific drugs improve exercise endurance, quality of life, and survival of patients.3,4 However, pharmacologic interventions are not always accessible and, most importantly, not all patients respond to treatment. Many patients will continue to deteriorate and will eventually be in need of alternative interventions such as atrial septostomy or Potts anastomosis. These surgical/interventional approaches were initially designed for patients born with congenital heart disease (CHD),5,6 but in recent years have been applied to improve the hemodynamic variables associated with RV failure (RVF) in the setting of PAH. Here we review the role of these 2 nonpharmacological alternatives in the management of PAH.

ATRIAL SEPTOSTOMY

Background and Rationale

There is both clinical and experimental evidence suggesting that, in the setting of PAH, an interatrial right-to-left shunt may be of benefit. From a clinical standpoint, we know that PAH patients with a patent foramen ovale survive longer than those without one.7 We also know that Eisenmenger patients with a comparable degree of pulmonary hypertension (PH) survive longer and do not develop severe RV dysfunction when compared to patients with PAH, reflecting better RV performance in Eisenmenger's physiology.8,9 The first study exploring and supporting the role of interatrial shunts in PAH was published by Austen et al almost 50 years ago.10 This study is extraordinary, not only because it demonstrated that the surgical creation of an atrial septal defect (ASD) in the setting of experimental RV hypertension provided hemodynamic benefit at rest and during exercise, but also because it described most of the knowledge we now possess regarding the physiological changes caused by atrial septostomy in the setting of PAH. In his original publication, Austen proposed that the surgical creation of an ASD should be performed for the management of patients with “primary” pulmonary hypertension (PPH).10 Interestingly, this operation never took place in part because years later, nonsurgical creation of an ASD for the management of CHD (ie, transposition of the great arteries) was successfully achieved by Rashkind5 and Park.6

Continuous improvements in transcatheter techniques to create an ASD became an attractive alternative in the setting of human PAH. In 1983, Rich and Lam11 were the first to perform this intervention. The rationale was that clinical deterioration and death in PPH were associated with obstruction to systemic flow and dilation and failure of the RV, thus creation of an ASD in this context would allow a right-to-left shunt to increase systemic output and allow for decompression of the right chambers, alleviating RVF. Initial case series published in the early 1990s1214 appeared to confirm this hypothesis and showed promising hemodynamic benefits for PAH patients, albeit with a high procedure-related mortality. Hence, recommendations to minimize procedure-related mortality were made at the World Symposium on PH in 1998,15,16 and have remained since.

Procedure

The technique of atrial septostomy has evolved over time and has undergone minor modifications by performing centers. At present, balloon dilation atrial septostomy (BDAS) is the preferred technique.14,17 It involves a standard right and left heart catheterization; baseline right and left heart pressures are recorded simultaneously and cardiac output is calculated by Fick method. Following baseline hemodynamic assessment, standard trans-septal puncture is performed using a Brockenbrough needle and a Mullins-type dilator. In recent years, the use of intracardiac echocardiography has been advocated to acquire better visualization of the atrial septum to guide trans-septal puncture.18 In addition, radiofrequency-assisted perforation of the atrial septum has been described as a safe and feasible alternative to conventional needle puncture.19 Once access into the left atrium is gained, the septostomy orifice is sequentially dilated using noncompliant peripheral balloons in a carefully graded step-by-step manner, beginning with a 4 mm diameter balloon, followed by dilation with an 8 mm, 12 mm, and 16 mm balloon if needed (Figure 1). Between each step and after a 3-minute waiting period allowing hemodynamic stabilization, left ventricular end-diastolic pressure (LVEDP) and arterial oxygen saturation (SaO2) are obtained. The final diameter of the ASD is reached on an individual basis when any of the following criteria are met: 1) LVEDP increase to =18 mm Hg; 2) decrease in SaO2 to 80% or below; or 3) a 10% SaO2 decrease from baseline. Post-procedure care requires a stay in the intensive care unit for at least 48 hours, where continuous supplementary oxygen is delivered and appropriate anticoagulation is started. Upon hospital discharge, all patients are followed as outpatients, with particular attention to maintaining effective oral anticoagulation and appropriate hemoglobin levels.14,17

Balloon dilation atrial septostomy. After perforation of the septum with the Brockenbrough needle, a circular-end guidewire is positioned in the left atrium. An initial dilation of the atrial septum is done with the Inoue dilator (left panel), and concluded with balloons of different sizes (right panel) in a step-by-step manner.

Worldwide Experience

Proper appreciation of the role of atrial septostomy in the management of PAH has been limited mainly by the lack of controlled clinical trials demonstrating its efficacy and safety. Most of our knowledge regarding the procedure comes from small series of patients or case reports. In addition, the relative success of current pharmacologic strategies, as well as the notion of a previously reported high procedure-related mortality12,13,20 have prevented widespread use of this valuable intervention. Despite these limitations, experience with atrial septostomy has increased in the past few years.

In a recent worldwide experience review,21 372 procedures performed in 324 patients were identified; 304 had been reported in case series and another 20 as case reports. This experience is further enriched by the recent report of 85 procedures performed in 63 patients reported in 4 series2225 and 3 more reported as case reports,18,26,27 showing similar results. These studies demonstrate that atrial septostomy has largely been performed in young people (mean age 31 years), mostly women (~70%), and in patients with idiopathic PAH (IPAH) in functional classes III and IV (~77%). In a significant proportion, BDAS has been performed in patients with refractory CHF and recurrent syncope despite maximal medical treatment. In this context, BDAS is the procedure of choice, and the size of the defect usually varies from 8 to 18 mm, with a mean value of approximately 11 mm. A large majority of patients (~86%) survive the procedure, with 90% of patients describing improvement in symptoms and functional capacity. Furthermore, approximately 13% of patients received a lung transplant at some point after the procedure.21

Overall procedure-related mortality is 14%, with 8% occurring within the first 24 hours due to refractory hypoxemia and an additional 6% occurring within the first month post-intervention. Baseline right atrial pressure (RAP), in particular RAP >20 mm Hg, remains the most significant risk factor for procedure-related mortality.28 Low SaO2 following intervention, perhaps in relation to an oversized septostomy, has also been associated with higher risk of death.21 Technical expertise and experience with the procedure also contribute to mortality, as reflected by lower mortality reported in recent series.22,23,29

The hemodynamic effects of an atrial septostomy depend highly on the baseline RAP. Table 1 shows how a higher baseline RAP will result in a more pronounced hemodynamic effect, particularly when RAP is >20 mm Hg (ie, severe RVF). However, as previously mentioned, patients with RAP >20 mm Hg will also have a significantly higher risk of death during the procedure as a result of refractory hypoxemia. Thus, it appears that the best risk-benefit ratio corresponds to the group with RAP between 10 and 20 mm Hg. Nevertheless, it should be noted that even when RAP is <10 mm Hg (predominantly patients presenting with syncope), there is a significant increase in CI as well as an improvement in functional class, suggesting that septostomy at an earlier stage of disease could be beneficial.21 It is also important to note that most of the hemodynamic variables reported have been obtained during the resting state and that the hemodynamic impact might be different and better during exercise, when the septostomy could be functioning as a “safety pop-off valve.” This concept of better function in patients having an ASD during exercise in the setting of RV hypertension was demonstrated by Austen many years ago,10 and may in part explain the improvement in exercise tolerance reported by patients in some series.14,3032

Hemodynamic effects of atrial septostomy according to baseline right atrial pressure

VariableBaseline RAP <10 mm Hg (N=27)
P valueBaseline RAP 10-20 mm Hg (N=51)
P valueBaseline RAP >20 mm Hg (N=26)
P value
BeforeAfterBeforeAfterBeforeAfter
Syncope (%) 65.2   26.2   12  
RVF (%) 26   33.3   64  
Both (RVF + syncope) 8.7%   40.5%   24%  
RAP, mm Hg 5.8 ± 1.96 5.48 ± 3.1 0.622 14.1 ± 3.2 11.4 ± 3.8 0.001 25.8 ± 4.9 19.2 ± 4.4 0.001
LAP, mm Hg 4.9 ± 2.47 6.5 ± 2.5 0.050 5.3 ± 3.6 7.9 ± 4.2 0.001 7.9 ± 3 10.4 ± 3.7 0.024
R-L atrial pressure, mm Hg 1.17 ± 3.2 -1.32 ± 3.2 0.023 8.4 ± 4.1 3.3 ± 5.5 0.001 17.3 ± 5 7.7 ± 5.3 0.001
Mean PAP, mm Hg 62.8 ± 17 64 ± 19.6 0.588 64.9 ± 16.7 65.6 ± 16.7 0.617 64.8 ± 23 69.9 ± 24.7 0.185
Cardiac index, L/min/m2 2.37 ± 0.61 2.80 ± 0.7 0.001 2.10 ± 0.70 2.7 ± 0.9 0.001 1.6 ± 0.5 2.2 ± 0.6 0.001
SaO2 (%) 93.5 ± 4.1 87.2 ± 7.4 0.001 92.9 ± 4.1 82.8 ± 7.4 0.001 92.2 ± 4.5 78.3 ± 9.7 0.001
Procedure-related mortality 1 month 0/27 (0%)   2/51 (4%)   11/26 (42.3%)  

RAP=mean right atrial pressure; RVF=right ventricular failure; LAP=mean left atrial pressure; PAP=pulmonary artery pressure; R-L=right minus left atrial pressure.21

With regard to the long-term effects on RV function after septostomy, information is scarce, but there appears to be sustained improvement. Kerstein13 and Law33 have shown improvement in long-term hemodynamics: approximately 2 years after septostomy. Likewise, Espínola-Zavaleta34 showed that, 3 to 6 months after septostomy, there was a decrease in right atrial area and in end-systolic and end-diastolic RV areas, a finding compatible with decompression of the right-sided chambers. In agreement with this decompression phenomenon and the relief of failure is the report from O'Byrne et al,35 demonstrating a significant decrease in b-type natriuretic peptide (BNP) after septostomy. Atrial septostomy may also have additional beneficial effects on RV function. Ciarka and coworkers36 showed a significant decrease in muscle sympathetic nerve activity after the procedure; of interest, sympathetic overdrive in PAH may be one mechanism involved in RVF.37

Spontaneous closure of the septostomy is not an infrequent finding during follow-up. This situation can be overcome by repeating the procedure.14 In addition, alternative interventions such as deployment of a fenestrated device (ie, Amplatzer septal occluder),3842 concomitant use of a butterfly stent (flared at both extremes),32,43,44 and cryo-ablation of the septostomy borders18 have been described. However, the safety and long-term efficacy of these additional interventions remains to be determined.

There is no definitive answer regarding the optimal size of the defect, and the size of the septostomy should be performed on an individual basis. One should aim to increase cardiac output and decompress the RV, but refractory hypoxemia should be avoided. Based on recent experimental data, it would appear that increasing cardiac output no more than 15% to 20% from baseline would provide the greatest benefits and results.4547

Although atrial septostomy improves hemodynamic variables that correlate with clinical improvement and survival, true impact of septostomy on survival of patients with PAH is difficult to assess due to lack of controlled long-term studies (something that is also true for most of the current pharmacological options). However, the survival rates for patients with long-term follow-up in different case series appear to be better when compared with either historical controls or predicted survival.13,22,29,32,33 Unfortunately, during follow-up there is a significant drop of cumulative survival in time, reflecting the palliative nature of the procedure. In other words, atrial septostomy does not cure or reverse PAH and the beneficial effects of the procedure erode over time. The short- or median-term impact on survival, however, provides valuable time for the application of other noteworthy interventions (ie, PAH-specific drugs and/or transplantation).

In summary, based on the review of the worldwide collective experience, atrial septostomy stands as an additional strategy in the treatment of severe RVF from PAH. In the majority of cases, the procedure has been performed at an advanced stage of the disease in patients already burdened with a significantly higher risk of death; yet, despite progression of disease in these patients, BDAS frequently leads to clinical and hemodynamic improvement. Analysis of the worldwide clinical experience suggests that procedure-related mortality is decreasing. In this regard, the following guidelines are important: 1) do not perform septostomy in moribund patients (those with RAP >20 mm Hg); 2) always perform BDAS using a step-by-step approach; 3) employ constant monitoring of hemodynamic variables (RAP, LVEDP, CI, and SaO2; 4) limit the size of the defect to aim for a decrease in baseline SaO2 of no more than 10% and an increase in baseline CI of no more than 15% to 20%; 5) BDAS should only be performed in centers widely experienced in both interventional cardiology and PH. The “ideal” candidate for the procedure remains a patient in functional class III, with RAP between 10 and 18 mm Hg and a baseline SaO2 >90%, with history of syncope or persistent RVF despite maximal medical therapy as part of a goal-oriented strategy.3 The procedure may also be considered either as a bridge to lung transplant or as the sole treatment modality when other therapeutic options are not available.

POTTS SHUNT

Potts' aortopulmonary anastomosis was originally intended as a form of palliative treatment for some CHD with diminished pulmonary blood flow.48 The procedure, which employs a side-by-side anastomosis between the left pulmonary artery and the descending aorta, has been recently reexamined in the management of refractory PAH49,50 as a surgical/interventional alternative to atrial septostomy. It shares the same concept and rationale: that is, to produce a right-to-left shunt to increase systemic output, but at a post-tricuspid level, similar to that observed in patients with patent ductus arteriosus (PDA) and PH who survive longer and have less right heart failure than patients with IPAH.8,9 In theory, the main advantage of a Potts shunt over an atrial septostomy is that it creates a permanent postcardiac right-to-left shunt that does not lead to arterial oxygen desaturation in the upper part of the body, including the brain and the coronary circulation.5052

Since the original description by Blanc and coworkers49 of successful application of this surgical procedure in 2 boys with suprasystemic PH after an arterial switch for transposition of the great arteries (Figure 2), experience and interest have rapidly expanded.5057 The surgical procedure is performed under general anesthesia, usually via a left thoracotomy without cardiopulmonary bypass, and the size of the shunt (which remains controversial) is set at ~9 mm.

Schematic representation of the Potts anastomosis. The procedure consists of the surgical creation of a side-by-side anastomosis between the left pulmonary artery and the descending aorta. From Blanc J, Vouhé P, Bonnet D. Potts shunt in patients with pulmonary hypertension. N Engl J Med. 2004;350(6):623. Reprinted with permission from Massachusetts Medical Society.

Until now, this surgical approach has been performed mostly in children with refractory PAH at an advanced stage of disease where Potts anastomosis may be considered a lifesaving procedure. This procedure often results in significant improvement in functional class, exercise tolerance, and reduced levels of natriuretic peptides in survivors.4957 However, there is also an inherent risk of mortality during or after this surgical procedure in this very sick PAH population. Also, adults with PAH and severe RVF undergoing this intervention might have a different postoperative prognosis and higher perioperative mortality.

TRANSCATHETER POTTS SHUNT

To bypass the potential risks associated with surgery and after demonstrating its feasibility in animal models,58 an innovative technique using a transcatheter approach to create a Potts shunt (TPS) has been recently described in humans with PAH.59 In this report, 4 patients with severe PAH underwent TPS. Under general anesthesia, vascular perforation was guided by fluoroscopy, and the shunt was created via placement of an iCAST 7x22 mm covered stent (Atrium Medical, Hudson, NH, USA) between the left pulmonary artery and the descending aorta. Although considered technically successful in 3 cases, 1 patient died during the procedure as a result of uncontrolled hemothorax, and another died just a few days later as result of ventilation-associated pneumonia. The remaining 2 patients showed significant symptomatic improvement and had no complications after 4 and 10 months during follow-up.

Baruteau and coworkers have recently published a compendium of their experience with both surgical anastomosis and TPS in the management of PAH.51 Their pooled data on 24 children (aged 1.5–17 years) who underwent Potts shunt (19 surgical, 5 TPS) for drug-refractory PAH demonstrated severe postoperative complications occurring in 6 patients (25% of the surgical group), including 3 early deaths (12.5%) due to low cardiac output. After a median follow-up of 2.1 years (range, 3 months to 14.3 years), 6-minute walk and functional class were improved in the remaining 21 survivors (World Health Organization functional class I or II). None of the patients experienced syncope or worsening RVF. BNP/NT-proBNP levels returned to normal in all patients. The authors concluded that creation of a palliative Potts shunt prolonged survival and dramatically and consistently improved functional class in children with severe, drug-refractory PAH.

Bleeding (massive hemothorax) is the most feared complication of TPS. In this regard, computed tomography of the thorax prior to the procedure could help select the ideal candidate for surgery.60 In this study, the authors described 2 types of relationships between left lower pulmonary artery and descending aorta; in type 1, there is practically no distance between the vessels, and in type 2 the gap between the structures is greater, thus increasing the risk of bleeding. In theory, type 1 patients represent the ideal candidates for TPS anastomosis. A radiofrequency-assisted perforation approach is yet another refinement to try to improve the safety and efficacy of TPS creation.61

The concept of the potential benefit of this type of pulmonary-to-systemic shunt in the setting of PH has been applied to the pediatric population by creation of a “functional” Potts by stenting the ductus arteriosus in newborns and infants with suprasystemic PH of various etiologies.62,63

Although creating a post-tricuspid shunt would be intuitive based on data from Eisenmenger patients with PDA, it remains to be determined whether a post-tricuspid defect will prove equal to or superior to atrial septostomy. Apart from the expected reduction in RV afterload, there are several issues to consider when bypassing the pulmonary artery flow to the descending aorta. The most important is the potential equalization of systemic and pulmonary pressures, limiting the ability to further offload the RV and the concern of a left-to-right shunt during exercise and/or the development of systemic hypertension with aging. To address this potential problem, a unidirectional valved conduit for surgical Potts shunt has been developed and tested in an experimental animal model of PAH.58

In sum, it appears that Potts anastomosis (surgical or interventional) is indeed an innovative approach for management of PAH and an alternative to atrial septostomy. However, more experience and refinement of the technique is needed both to reduce the risks associated with the surgical approach and to establish TPS as an accepted therapeutic modality for advanced PAH.

CONCLUSION

Despite advances in pharmacologic treatment, PAH remains a fatal disease. BDAS and the recently adopted surgical/interventional Potts anastomosis stand as therapeutic alternatives in selected patients with refractory RVF from PAH. These interventions may improve quality of life and prolong survival in this population. Substantial experience with these procedures has been limited by the relative success of current pharmacologic strategies and the lack of significant expertise to master the techniques; however, these interventions should be available and performed in centers experienced in both interventional cardiology and PH. The optimal timing of when to perform either remains a challenge, but we should not be delayed to the point of being contraindicated or ineffective.

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