Chronic thromboembolic pulmonary hypertension and balloon pulmonary angioplasty - Where are we in 2024?

Pulmonary endarterectomy (PEA) is the first-line treatment for patients with chronic thromboembolic pulmonary hypertension (CTEPH). However, some patients with CTEPH are considered inoperable, and in the last decade, balloon pulmonary angioplasty (BPA) has emerged as a viable therapeutic option for these patients with prohibitive surgical risk or recurrent pulmonary hypertension following PEA. Numerous international centers have increased their procedural volume of BPA and have reported improvements in pulmonary hemodynamics, patient functional class and right ventricular function. Randomized controlled trials have also demonstrated similar findings. Recent refinements in procedural technique, increased operator experience and advancements in procedural technology have facilitated marked reduction in the risk of complications following BPA. Current guidelines recommend BPA for patients with inoperable CTEPH and persistent pulmonary hypertension following PEA. The pulmonary arterial endothelium plays a vital role in the pathophysiologic development and progression of CTEPH.

Effects of right ventricular remodeling in chronic thromboembolic pulmonary hypertension on the outcomes of balloon pulmonary angioplasty: a 2D-speckle tracking echocardiography study

BACKGROUND

Balloon pulmonary angioplasty (BPA) improves the prognosis of chronic thromboembolic pulmonary hypertension (CTEPH). Right ventricle (RV) is an important predictor of prognosis in CTEPH patients. 2D-speckle tracking echocardiography (2D-STE) can evaluate RV function. This study aimed to evaluate the effectiveness of BPA in CTEPH patients and to assess the value of 2D-STE in predicting outcomes of BPA.

METHODS

A total of 76 patients with CTEPH underwent 354 BPA sessions from January 2017 to October 2022. Responders were defined as those with mean pulmonary artery pressure (mPAP) ≤ 30 mmHg or those showing ≥ 30% decrease in pulmonary vascular resistance (PVR) after the last BPA session, compared to baseline. Logistic regression analysis was performed to identify predictors of BPA efficacy.

RESULTS

BPA resulted in a significant decrease in mPAP (from 50.8 ± 10.4 mmHg to 35.5 ± 11.9 mmHg, p < 0.001), PVR (from 888.7 ± 363.5 dyn·s·cm-5 to 545.5 ± 383.8 dyn·s·cm-5, p < 0.001), and eccentricity index (from 1.3 to 1.1, p < 0.001), and a significant increase in RV free wall longitudinal strain (RVFWLS: from 15.7% to 21.0%, p < 0.001). Significant improvement was also observed in the 6-min walking distance (from 385.5 m to 454.5 m, p < 0.001). After adjusting for confounders, multivariate analysis showed that RVFWLS was the only independent predictor of BPA efficacy. The optimal RVFWLS cutoff value for predicting BPA responders was 12%.

CONCLUSIONS

BPA was found to reduce pulmonary artery pressure, reverse RV remodeling, and improve exercise capacity. RVFWLS obtained by 2D-STE was an independent predictor of BPA outcomes. Our study may provide a meaningful reference for interventional therapy of CTEPH.

Angiographic classification of total occlusion and its implication on balloon pulmonary angioplasty

AIMS

Despite refinements in balloon pulmonary angioplasty (BPA), total occlusion remains a challenge in chronic thromboembolic pulmonary hypertension (CTEPH). Owing to their low success and high complication rates, most interventional cardiologists are reluctant to address total occlusion, and there is a paucity of literature on BPA performance in total occlusion. We aimed to classify total occlusion according to morphology and present an illustrative approach for devising a tailored treatment strategy for each distinct type of total occlusion.

METHODS AND RESULTS

All patients diagnosed with CTEPH who underwent BPA between May 2018 and May 2022 at Fuwai Hospital in Beijing, China, were included retrospectively. A total of 204 patients with CTEPH who underwent BPA were included in this study. Among these, 38 occluded lesions were addressed in 33 patients. Based on the morphology, we categorized the lesions into three groups: pointed-head, round-head, and orifice occlusions. Pointed-head occlusion could be successfully addressed using soft-tip wire, round-head occlusion warranted hard-tip wire and stronger backup, and orifice occlusion warranted the strongest backup force. The success rates for each group were as follows: pointed-head (95.45%), round-head (46.15%), and orifice occlusion (33.33%), with orifice occlusion having the highest complication rate (50%). The classification of occlusion was associated with BPA success (round-head occlusion vs. pointed-head occlusion, OR 24.500, 95% CI 2.498-240.318, P = 0.006; orifice occlusion vs. pointed-head occlusion, OR 42.000, 95% CI 3.034-581.434, P = 0.005).

CONCLUSIONS

Occlusion morphology has a significant impact on BPA success and complication rates. A treatment strategy tailored to each specific occlusive lesion, as outlined in the present study, has the potential to serve as a valuable guide for clinical practitioners.

Efficacy of balloon pulmonary angioplasty in chronic thromboembolic pulmonary hypertension patients with pulmonary comorbidity

Background

Balloon pulmonary angioplasty (BPA) is an established treatment for inoperable chronic thromboembolic pulmonary hypertension (CTEPH), but its efficacy in CTEPH patients with a pulmonary comorbidity has not been well-studied. Here, we compared post-BPA outcomes between CTEPH patients with and without chronic pulmonary disease at baseline and analyzed predictors of BPA success.

Methods

From August 2017 to October 2022, 62 patients with inoperable CTEPH who underwent BPA were consecutively enrolled and grouped based on the presence of a pulmonary comorbidity at baseline. All patients underwent transthoracic echocardiography, pulmonary function tests, and right heart catheterization. Pre- and post-BPA data were evaluated to identify factors that influence the success of BPA.

Results

Among the 62 CTEPH patients, BPA was considered successful in 50 patients and unsuccessful in 12 patients. Responders to BPA had better exercise capacity and right heart function at baseline, but no differences in hemodynamic or respiratory function were detected between the groups. In CTEPH patients with chronic pulmonary disease (n = 14), BPA significantly improved mean pulmonary arterial pressure, pulmonary vascular resistance and right heart function parameters. Only CTEPH patients without chronic pulmonary disease (n = 48) exhibited significant improvement in 6-minute walk distance and respiratory function. Multivariate logistic regression analysis showed that pulmonary comorbidity at baseline was independently associated with the efficacy of BPA.

Conclusions

BPA provided significantly improvements in hemodynamics and right heart function in CTEPH patients, independent of pulmonary comorbidity at baseline. However, pulmonary comorbidity can negatively impact post-BPA outcomes.

[Update in the management of chronic thrombo-embolic pulmonary hypertension]

Chronic thrombo-embolic pulmonary hypertension (CTEPH) is a potentially curable form of pulmonary hypertension (PH) that develops in up to 3% of patients after pulmonary embolism (PE). In these patients, PE does not resolve, leading to organized fibrotic clots, with the development of precapillary PH as a result of the proximal obstruction of the pulmonary arteries. In addition, a distal microvasculopathy may also develop, contributing to the increase of pulmonary vascular resistance. Transthoracic echocardiography is the diagnostic tool that allows to establish the suspicion of PH. Ventilation-perfusion lung scintigraphy is the fundamental tool in the study of patients with suspected CTEPH; if it is normal, virtually rules out the diagnosis. Right heart catheterization is mandatory for the diagnosis of these patients. CTEPH is defined as the existence of symptoms, residual perfusion defects and precapillary PH after a minimum period of three months of anticoagulation. Pulmonary angiography helps determine the extent and surgical accessibility of thromboembolic lesions. CTEPH patients are candidates for long-term anticoagulation. Pulmonary endarterectomy is the treatment of choice, resulting in significant clinical and hemodynamic improvement. About 25% of patients have residual PH post-endarterectomy. Balloon pulmonary angioplasty is an endovascular technique that targets more distal lesions, being potentially useful for patients with inoperable CTEPH or persistent/recurrent PH post-endarterectomy. Both types of patients may also benefit from pharmacological treatment for PH. These three therapies are the cornerstone of CTEPH treatment, which has evolved towards a multimodal approach.

Spontaneous hemodynamic improvement after balloon pulmonary angioplasty in patients with chronic thromboembolic pulmonary hypertension is observed within a short term after balloon pulmonary angioplasty

Natural hemodynamic changes after balloon pulmonary artery angioplasty (BPA) in a unified state without oxygen administration in patients with chronic thromboembolic pulmonary hypertension (CTEPH) remains undetermined. This study aimed to clarify the delayed changes in the hemodynamics after BPA in patients with CTEPH. We analyzed 73 consecutive patients with CTEPH who underwent BPA between July 2014 and December 2022. We extracted and evaluated hemodynamic data of the right heart catheter without oxygen administration immediately before and after the first BPA; and immediately before the second BPA, as the "post-delayed changes" after BPA. BPA significantly improved the mean pulmonary artery pressure (mPAP, mmHg) and pulmonary vascular resistance (PVR, dyn-s/cm5) from 36 (32-43) mmHg and 449 (312-627) dyn-s/cm5 before the first BPA to 28 (23-32) mmHg and 275 (217-366) dyn-s/cm5 immediately after BPA, and further significantly improved the values to 23 (20-28) mmHg and 225 (175-301) dyn-s/cm5 post-delayed changes after BPA, respectively. Improvement observed on account of delayed changes was observed both with and without pulmonary hypertension drugs. The delayed changes were observed during a period of 5-180 days, which did not correlate with the changes in mPAP and PVR. Hemodynamic improvement owing to BPA was observed immediately after BPA; however, further improvement was observed as a result of delayed changes. mPAP improved by 3.4 ± 5.2 mmHg and PVR by 53 (10-99) dyn-s/cm5 as delayed improvement. mPAP and PVR showed delayed improved by approximately 10% of their values before BPA.

Development and validation of a nomogram for predicting hemodynamic response to balloon pulmonary angioplasty in patients with chronic thromboembolic pulmonary hypertension

BACKGROUND

Balloon pulmonary angioplasty (BPA) can effectively alleviate pulmonary hypertension in patients with chronic thromboembolic pulmonary hypertension (CTEPH). Identifying predictors of unfavorable hemodynamic response to BPA is essential to guide clinical practice. Therefore, our objective was to construct and validate a nomogram to facilitate clinicians predicting hemodynamic response to BPA.

METHODS

Patients with CTEPH and underwent BPA from May 2018 to April 2022 were retrospectively collected. Favorable hemodynamic response to BPA was defined as a mean pulmonary arterial pressure ≤30 mmHg and/or a reduction in pulmonary vascular resistance ≥30 % at follow-up.

RESULTS

A total of 155 patients were included. At baseline, patients with favorable hemodynamic response had significantly lower proportion of occlusive lesions (11.11 % vs. 26.32 %, P = 0.017), higher diffusing capacity of the lungs for carbon monoxide (63.77 % ± 14.10 % vs. 59.11 % ± 11.78 %, P = 0.039), and better cardiac morphology than counterparts. LASSO regression and random forest were used to construct prediction models respectively. The LASSO regression model demonstrated better predictive ability and accuracy than the random forest model, as evidenced by higher area under curve (0.745 vs. 0.740) and lower Brier score (0.192 vs. 0.195). A nomogram was constructed based on the LASSO regression model, consisting of right ventricular end-diastolic diameter/left ventricular end-diastolic diameter, number of treated pulmonary vessels and proportion of occlusion lesions. High predictive ability of the LASSO model was preserved in validation (C index 0.744).

CONCLUSIONS

The current study constructed a nomogram with high accuracy in predicting BPA hemodynamic outcome, which could facilitate decision-making in clinical practice.

Predictors of procedural complications in balloon pulmonary angioplasty for chronic thromboembolic pulmonary hypertension

BACKGROUND

Balloon pulmonary angioplasty (BPA) is an effective treatment for inoperable chronic thromboembolic pulmonary hypertension, with good results reported for residual pulmonary hypertension (PH) after pulmonary endarterectomy (PEA). However, BPA is associated with complications, such as pulmonary artery perforation and vascular injury, which can lead to critical pulmonary hemorrhage requiring embolization and mechanical ventilation. Furthermore, the risk factors for occurrence of complications in BPA are unclear; therefore, this study aimed to evaluate predictors of procedural complications in BPA.

METHODS

In this retrospective study, we collected clinical data (patient characteristics, details of medical therapy, hemodynamic parameters, and details of the BPA procedure) from 321 consecutive sessions involving 81 patients who underwent BPA. Procedural complications were evaluated as endpoints.

RESULTS

BPA for residual PH after PEA was performed in 141 sessions (43.9 %), which involved 37 patients. Procedural complications were observed in 79 sessions (24.6 %), including severe pulmonary hemorrhage requiring embolization in 29 sessions (9.0 % of all sessions). No patients experienced severe complications requiring intubation with mechanical ventilation or extracorporeal membrane oxygenation. Age ≥ 75 years and mean pulmonary artery pressure ≥ 30 mmHg were independent predictors of procedural complications. Residual PH after PEA was a significant predictor of severe pulmonary hemorrhage requiring embolization (adjusted odds ratio, 3.048; 95 % confidence interval, 1.042-8.914, p = 0.042).

CONCLUSIONS

Older age, high pulmonary artery pressure, and residual PH after PEA increase the risk of severe pulmonary hemorrhage requiring embolization in BPA.

Comparison of different treatment strategies in patients with chronic thromboembolic pulmonary hypertension: a single centre real-world experience

BACKGROUND

Pulmonary endarterectomy (PEA) has been the most effective therapy for chronic thromboembolic pulmonary hypertension (CTEPH). However, there is a substantial proportion of patients deemed not operable in whom other treatment strategies are available: medical therapy and balloon pulmonary angioplasty (BPA). We aimed to compare different CTEPH treatment strategies effect in a real-world setting.

METHODS

All patients with CTEPH referred to our centre were included. We compare the short-term clinical, functional, exercise and haemodynamic effect of medical therapy (irrespective of subsequent treatment strategies), PEA and BPA (irrespective of previous/subsequent treatment strategies); we also describe the long-term outcome of the different patient groups.

RESULTS

We included 467 patients (39% were treated only with medical therapy, 43% underwent PEA, 13% underwent BPA and 5% were not treated with any therapy). Patients treated only with medical therapy were the oldest; compared to patients undergoing PEA, they had a lower exercise capacity, a higher risk profile and gained a lower haemodynamic, functional and survival benefit from the treatment. Patients undergoing BPA had a lower haemodynamic improvement but a comparable functional, exercise and risk improvement and a similar survival compared to patients undergoing PEA; their survival is anyway better than patients undergoing only medical treatment. Untreated historical control patients had the worst survival.

CONCLUSIONS

We confirm the superiority of PEA compared to any alternative treatment in CTEPH patients and we observe that BPA, in patients deemed not operable or with persistent/recurrent PH after PEA, leads to a better outcome than medical therapy alone.

Impact of psychiatric disorders on the hemodynamic and quality of life outcome of balloon pulmonary angioplasty in patients with chronic thromboembolic pulmonary hypertension: a retrospective study

BACKGROUND

Balloon pulmonary angioplasty (BPA) has beneficial effects on pulmonary hemodynamics, exercise capacity, and quality of life (QOL) in patients with chronic thromboembolic pulmonary hypertension (CTEPH). Recently, emerging evidence suggests a relationship between CTEPH and psychiatric disorders (PD). However, data on the clinical efficacy of BPA in CTEPH patients with PD are lacking.

METHODS

We retrospectively analyzed 75 patients with inoperable/residual CTEPH who underwent BPA and right-sided heart catheterization before the initial BPA and within 1 year after the last procedure. QOL was evaluated using the European Quality of Life Five Dimension (EQ-5D) scale in 27 patients before and after BPA sessions. Baseline and post-procedural hemodynamic, functional, and QOL parameters were compared between the patients with and without PD.

RESULTS

Among the 75 participants, 22 (29.3%) patients were categorized in the PD group. Although PD group had a similar mean pulmonary artery pressure level compared with non-PD group (40 ± 7 vs. 41 ± 9 mmHg, p = 0.477), they tended to have unfavorable QOL status (0.63 ± 0.22 vs. 0.77 ± 0.19, p = 0.102). BPA significantly improved pulmonary hemodynamics, laboratory parameters and exercise tolerance in both groups. BPA also significantly improved EQ-5D scores in the non-PD group (from 0.77 ± 0.19 to 0.88 ± 0.13, p < 0.001), but the scores remained unchanged in the PD group (from 0.63 ± 0.22 to 0.67 ± 0.22, p = 0.770). During the long-term period [1,848 (1,055-2,565) days], both groups experienced similar mortality rates (PD 4.6% vs. non-PD 5.7%, p = 1.000).

CONCLUSIONS

BPA improved hemodynamic and functional parameters irrespective of PD, but its effect on QOL was limited in patients with PD.

Electrocardiographic changes after balloon pulmonary angioplasty in chronic thromboembolic pulmonary hypertension: Data from the Hellenic Registry

BACKGROUND

Balloon pulmonary angioplasty (BPA) has provided an effective invasive treatment for inoperable patients with chronic thromboembolic pulmonary hypertension (CTEPH). The hemodynamic improvement achieved by BPA has significantly increased the long-term prognosis of these patients, mostly by reversing the negative remodeling of the right ventricle (RV).

MATERIALS AND METHODS

In a cohort of 17 patients with symptomatic CTEPH hemodynamic data were collected before and after the completion of BPA sessions. After the confirmation of statistically significant hemodynamic improvement, we examined the changes in certain prespecified electrocardiographic (ECG) parameters (PR interval duration, QRS duration, QTc interval duration, R wave and S wave amplitude in lead I, R wave and S wave amplitude in precordial leads V1, V5 and V6) before the initiation and one month after the completion of BPA sessions. In addition, ECGs were qualitatively assessed before and after treatment for the presence of ECG abnormalities related to PH, proposed by the guidelines of the European Society of Cardiology (ESC). The term ESC criteria 1-6 was used for their description.

RESULTS

Statistically significant correlation (p < 0.05) was found between the reduction in mean pulmonary artery pressure (mPAP) and the decrease of the depth of the S wave in leads I (p 0.0069), V5 (p 0.0003), V6 (p 0.0011) and in the R wave amplitude in leads V5 (p 0.0122) and V6 (p 0.0185). From the ESC criteria, RV strain pattern was the commonest in the initial cohort, with significant improvement after therapies.

CONCLUSION

Hemodynamic improvement after BPA therapies is correlated with improved ECG amplitude parameters in leads I, V5 and V6. RV strain pattern is common among untreated patients with significant improvement after therapies.

"Guidezilla" extension catheter combined with balloon technique for treating pulmonary artery stenosis caused by Takayasu arteritis

Takayasu arteritis (TA) is a rare systemic vasculitis of the aorta and its primary branches, which usually occurs in young women. Due to its insidious onset and lack of specific symptoms, this disease can be easily misdiagnosed or missed. Approximately 50 ​% of the patients having TA with pulmonary artery involvement develop pulmonary hypertension (PH). The 3-year survival rate among patients with TA-related PH is lower than that among patients with TA alone. Early balloon pulmonary angioplasty (BPA) can improve the clinical symptoms and survival of patients with stable TA. To the best of our knowledge, this is the first case reported in the English literature in which a "Guidezilla" catheter was used during BPA to treat stenosis and occlusion of the pulmonary artery caused by Takayasu arteritis (TA).

Balloon pulmonary angioplasty for chronic thromboembolic pulmonary hypertension: a clinical consensus statement of the ESC working group on pulmonary circulation and right ventricular function

The current treatment algorithm for chronic thromboembolic pulmonary hypertension (CTEPH) as depicted in the 2022 European Society of Cardiology (ESC)/European Respiratory Society (ERS) guidelines on the diagnosis and treatment of pulmonary hypertension (PH) includes a multimodal approach of combinations of pulmonary endarterectomy (PEA), balloon pulmonary angioplasty (BPA) and medical therapies to target major vessel pulmonary vascular lesions, and microvasculopathy. Today, BPA of >1700 patients has been reported in the literature from centers in Asia, the US, and also Europe; many more patients have been treated outside literature reports. As BPA becomes part of routine care of patients with CTEPH, benchmarks for safe and effective care delivery become increasingly important. In light of this development, the ESC Working Group on Pulmonary Circulation and Right Ventricular Function has decided to publish a document that helps standardize BPA to meet the need of uniformity in patient selection, procedural planning, technical approach, materials and devices, treatment goals, complications including their management, and patient follow-up, thus complementing the guidelines. Delphi methodology was utilized for statements that were not evidence based. First, an anatomical nomenclature and a description of vascular lesions are provided. Second, treatment goals and definitions of complete BPA are outlined. Third, definitions of complications are presented which may be the basis for a standardized reporting in studies involving BPA. The document is intended to serve as a companion to the official ESC/ERS guidelines.

Evolving Role and Clinical Evidence in the Global Practice of Balloon Pulmonary Angioplasty

Balloon pulmonary angioplasty (BPA) was first described in 2001 and now has evolved into a class I indication for inoperable or residual chronic thromboembolic pulmonary hypertension. This review article aims to describe evidence from studies performed at various pulmonary hypertension (PH) centers across the globe, to better understand the role of BPA in chronic thromboembolic pulmonary disease with and without PH. Additionally, we hope to highlight innovations and the ever-changing safety and efficacy profile of BPA.

Technical Considerations for Performing Safe and Effective Balloon Pulmonary Angioplasty in Patients with Chronic Thromboembolic Pulmonary Hypertension

Chronic thromboembolic pulmonary hypertension (CTEPH) is a late complication of acute pulmonary thromboembolism owing to incomplete clot dissolution in pulmonary artery. Pulmonary endarterectomy is the first-line treatment for CTEPH. However, 40% of patients are not candidates for surgery because of distal lesions or age. Balloon pulmonary angioplasty (BPA), a catheter-based intervention, is increasingly being used worldwide for treating inoperable CTEPH. Previous BPA strategy had a major concern of reperfusion pulmonary edema as a complication. However, recent refined strategies promise safe and effective BPA. Five-year survival rate after BPA is 90% for inoperable CTEPH, comparable with that of operable CTEPH.

Regional Program

Objectives

We sought to evaluate the efficacy and safety of refined balloon pulmonary angioplasty (BPA) in the treatment of patients with chronic thromboembolic pulmonary hypertension (CTEPH).

Background

BPA is rapidly evolving therapeutic option for patients with nonsurgical CTEPH. There are few US studies that have reported on the outcomes of this novel therapeutic option.

Methods

This is a retrospective study of CTEPH patients that underwent BPA at Temple University Hospital. The primary efficacy endpoint was the change in pulmonary vascular resistance (PVR) after BPA as compared to baseline and the primary safety endpoint was the rate of hemoptysis within 24 hours. Secondary endpoints included death, WHO functional class, and 6-minute walk distance (6MWD). We used logistic regression to evaluate factors associated with a hemodynamic and functional response.

Results

A total of 211 BPA sessions were performed on 77 patients (average 2.7 ± 1.7 sessions/patient). After BPA the mean PVR improved by 26% (P<0.001) while the mean 6MWD improved by 71.7 meters (P <0.001) and WHO functional class improved by one functional class (P <0.001). Ten sessions (4.7%) were complicated by hemoptysis. The independent factors associated with a improved functional and hemodynamic response included the pre-procedural use of riociguat, reduce baseline PA compliance and > 3 BPA sessions per patient.

Conclusion

This single center study from the US showed that BPA with refined techniques in patients with CTEPH was safe and was associated with significant improvements in pulmonary hemodynamics and functional capacity.

Rescue balloon pulmonary angioplasty for worsening chronic thromboembolic pulmonary hypertension with essential thrombocythaemia and the JAK2-V617F mutation: a case report

Background

Chronic thromboembolic pulmonary hypertension (CTEPH) is a rare thromboembolic disease, with occasional critical consequences. Essential thrombocythaemia (ET) is associated with an increased incidence of venous and arterial thrombotic events. In addition, the JAK2-V617F mutation increases the risk of thrombosis. Few reports have evaluated the utility of balloon pulmonary angioplasty (BPA) for worsening CTEPH with ET and the JAK2-V617F mutation.

Case Summary

A 76-year-old woman, diagnosed with ET and the JAK2-V617F mutation, presented with dyspnoea. Echocardiography showed severe tricuspid regurgitation with a flattened interventricular septum. Contrast-enhanced computed tomography showed an eccentric thrombus in the right main pulmonary artery (PA) and thrombi in bilateral peripheral PAs. Acute pulmonary embolism (PE) was initially diagnosed, and heparinization was initiated; however, her oxygen saturation gradually worsened despite continued anticoagulation therapy. Her oxygen saturation level decreased to 90% (under a reservoir mask of 10 L). Her haemodynamics suggested CTEPH comorbidity. We decided to perform emergency right heart catheterization (RHC) and pulmonary angiography (PAG). RHC showed severe pulmonary hypertension. PAG showed fresh and organized thrombi and web regions in several segmental PAs. These findings indicated a combination of acute PE and CTEPH. Rescue BPA was performed on the right A1, A3, A8, and A9 segments. After BPA, the patient's oxygen saturation showed marked improvement. The patient was discharged 18 days after hospitalization without complications.

Discussion

Rescue BPA could be an effective treatment for worsening CTEPH in severely impaired conditions, even with ET and the JAK2-V617F mutation.

Surgical and Device Interventions in the Treatment of Chronic Thromboembolic Disease

Chronic thromboembolic pulmonary disease (CTEPD) is characterized by unresolved clot burden in large pulmonary arteries, obstructive disease in smaller arteries, and increased downstream clot burden. This occurs in the setting of abnormal fibrinolysis or hematological disorders. Up to 50% of patients in some studies are unaware of a self-history of a deep venous thrombosis or pulmonary embolism. Ultimately, they present with symptoms of pulmonary hypertension (PH), which can result in right heart failure (RHF). Pulmonary endarterectomy (PEA) is curative, though many patients have prohibitive surgical risk or surgically inaccessible disease, warranting other interventions such as balloon pulmonary angioplasty (BPA) and medical therapy. Rarely, other treatment options may be implemented. We focus this review on PEA and BPA, with an overview of the history of CTEPD and the evolution of these procedures. We will briefly discuss other treatment modalities.

Corsair rotational bougie technique for facilitating balloon passage through a total occlusion lesion: a case report of balloon pulmonary angioplasty

A 77-year-old man presented with dyspnoea and was diagnosed with chronic thromboembolic pulmonary hypertension. Balloon pulmonary angioplasty was attempted; however, the balloons could not be advanced to the total occlusion lesion in the right A3 segment. The obstruction was overcome using a microcatheter Corsair (AsahiKASEI). This technique may be useful in managing a total occlusion lesion.

Riociguat and balloon pulmonary angioplasty improve prognosis in patients with inoperable chronic thromboembolic pulmonary Hypertension

BACKGROUND

The combination of riociguat and interventional balloon pulmonary angioplasty (BPA) is currently used to treat patients with inoperable chronic thromboembolic pulmonary hypertension (CTEPH). The aim of the present study was to evaluate the impact of this combination therapy on the prognosis of inoperable CTEPH patients by comparing the long-term survival rates of patients undergoing combination therapy with riociguat and BPA with those of inoperable patients from the first international CTEPH registry who did not receive specific treatment.

METHODS

Between March 2014 and August 2019, 138 technically inoperable patients were included in the present prospective, observational cohort study when they were treated with riociguat and BPA at a single CTEPH referral center. Long-term survival of this cohort was compared using propensity score matching with that of inoperable patients recruited between 2007 and 2009 in the first international CTEPH registry. Kaplan-Meier methods were used to evaluate differences in outcomes.

RESULTS

Whereas the survival rate in the historical group was 84.6% in the first year, 76.6% in the second, 68.5% in the third, and 58.5% in the fifth year after diagnosis, implementation of riociguat/BPA led to survival rates of 100%, 96.7%, 92.9%, and 90% in the respective follow-up periods. In a comparison of 83 well-matched pairs from the 2 cohorts, survival was markedly better in the group treated with riociguat and BPA than in the historical cohort (HR = 0.145, 95% CI 0.05, 0.421).

CONCLUSION

The combination of riociguat and BPA for the treatment of inoperable CTEPH is associated with excellent 5-year survival rates.

Long-term outcomes of combined pulmonary endarterectomy and additional balloon pulmonary angioplasty for chronic thromboembolic pulmonary hypertension

BACKGROUND

The early and long-term outcomes after pulmonary endarterectomy (PEA) for chronic thromboembolic pulmonary hypertension (CTEPH) have been established by several high-volume centers, but the impact of postoperative residual pulmonary hypertension affecting postoperative clinical parameters remains unclear. This study aims to investigate the institutional surgical results of PEA and to evaluate the efficacy of additional balloon pulmonary angioplasty (BPA) for residual pulmonary hypertension.

PATIENTS AND METHODS

We retrospectively reviewed 222 patients (57.7 ± 12.9 years old, 141 female) who underwent PEA for CTEPH at the National Cerebral and Cardiovascular Center between 2000 and 2020.

RESULTS

The preoperative mean pulmonary artery pressure (mPAP) was 45.6 ± 9.7 mmHg and pulmonary vascular resistance (PVR) was 1062 ± 451 dyne*sec/cm^-5. Postoperative mPAP (23.4 ± 11 mmHg, 204 patients, P < 0.001) and PVR (419 ± 291 dyne*sec/cm^-5, 199 patients, P < 0.001) significantly improved after PEA. Since 2011, 62 patients (28%) underwent BPA after PEA for "catecholamine dependent" residual PH 1 month after PEA in 14, "scheduled" BPA with residual PH 1 year after PEA in 32, and 16 "symptomatic" patients without residual PH. Their mPAP had significantly improved by PEA (48.1 ± 7.7 to 32.0 ± 10.2 mmHg, P < 0.001), and further improved (33.8 ± 11.1 to 26.5 ± 9.1 mmHg, P < 0.001) after BPA.

CONCLUSIONS

PEA provided immediate and substantial improvements in pulmonary hemodynamics and favorable long-term survival. In addition, postoperative BPA improved postoperative clinical parameters for eligible patients regardless of the presence of residual PH.

Percutaneous Treatments for Pulmonary Hypertension: Reviewing the Growing Procedural Role for Interventional Cardiology

Pulmonary arterial hypertension is a common and highly morbid medical problem resulting in elevated pulmonary arterial pressures and pulmonary vascular resistance. Medical therapies are costly, and not always well-tolerated. Surgical therapies such as pulmonary endarterectomy and lung transplantation are limited to a small subset of patients due to various patient, disease, or institutional factors. Over the past decade, there has been growing investigation into endovascular interventional therapies for patients with pulmonary hypertension such as balloon pulmonary angioplasty and pulmonary denervation. In this review, we describe the current status, future directions, and our recommendations on technical considerations with these therapies.

Bilateral versus unilateral balloon pulmonary angioplasty for inoperable chronic thromboembolic pulmonary hypertension

BACKGROUND

To evaluate the safety and efficacy of bilateral balloon pulmonary angioplasty (BPA) as compared with unilateral BPA for patients with inoperable chronic thromboembolic pulmonary hypertension (CTEPH).

METHOD

We reviewed 210 consecutive BPA sessions for 92 CTEPH patients, including 124 unilateral BPA sessions and 86 bilateral BPA sessions. Radiation exposure, operation details, lesions characteristics and the occurrence of complications were compared between unilateral BPA and bilateral BPA. 131 BPA sessions with a hemodynamics follow-up were included for efficacy analysis, in which hemodynamics changes were compared. Logistic regression analysis was used to identify factors associated with the occurrence of complications.

RESULT

Bilateral BPA treated more lobes, arteries and lesions [3 (2, 4) vs. 2 (1, 3) lobes, p < 0.001; 8 (5.5, 10) vs. 6 (4, 8) vessels, p = 0.003; 9 (7, 12) vs. 8 (5, 10) lesions, p = 0.01] in one single session than unilateral BPA in a comparable operation duration and amount of contrast media given. Overall, the occurrence of complications was similar between bilateral BPA and unilateral BPA [9 (10.5%) vs. 12 (9.7%), p = 0.83]. Hemodynamics effects didn't differ significantly between bilateral BPA and unilateral BPA in a single session [mPAP, - 4.5 ± 8.6 vs. - 3.6 ± 7.3 mmHg, p = 0.52; PVR, - 1.1 (- 3.5, 0.8) vs. - 1.8 (- 5.2, 0.3) Wood units, p = 0.21]. For the initial BPA session, bilateral BPA also treated more lobes, arteries and lesions than unilateral BPA [3 (2, 4) vs. 2 (1, 2) lobes, p < 0.001; 8.0 (5.8, 9.3) vs. 6.0 (4.0, 8.0) vessels, p = 0.04; 9 (6, 12) vs. 7 (4, 10) lesions, p = 0.02]. The occurrence of complications was also similar [5 (13.2%) vs. 5 (9.3%), p = 0.80], even in patients with poor baseline hemodynamics. Univariate regression analysis reveals the number of lobes treated/session, but not bilateral BPA, as predictive factors of complications.

CONCLUSION

Bilateral BPA may be safely and effectively performed in patients with CTEPH without increasing operation duration and radiation burden, even in patients with unfavorable baseline hemodynamics.

Comparison of fibrosing mediastinitis patients with vs. without markedly increased systolic pulmonary arterial pressure: a single-center retrospective study

INTRODUCTION

Fibrosing mediastinitis (FM) complicated with pulmonary hypertension (PH) has been considered as an important cause of morbidity and mortality. This study was designed to observe the possible effects of abnormal hemodynamics on patients by conducting a between-group comparison according to the presence of markedly increased systolic pulmonary arterial pressure (SPAP), so as to provide more information for clinical management.

MATERIALS AND METHODS

Fifty-one patients with clinically diagnosed FM were divided in two groups (SPAP < 50 mmHg group; SPAP ≥ 50 mmHg group) and retrospectively included in the study. Data mainly including demographic factors, echocardiographic data, results of right heart catheter and computed tomography (CT) examination were retrieved from the medical database. Echocardiographic parameters pre- and post- balloon pulmonary angioplasty (BPA) treatment were also collected in 8 patients.

RESULTS

Significant changes in cardiac structure, hemodynamics and cardiac function were detected in patients complicated with markedly increased SPAP. Patients in the SPAP ≥ 50 mmHg group had increased right heart diameter, right heart ratio and velocity of tricuspid regurgitation (VTR) (p < 0.05). Deteriorated right heart function was also observed. There was no significant difference in CT findings between the two groups, except that more patients in the SPAP ≥ 50 mmHg group had pleural effusion (p < 0.05). After primary BPA in 8 patients, improvement in the right atrium proportion was observed.

CONCLUSIONS

Changes due to significantly increased SPAP in patients with FM include adverse structure and function of the right heart, but differences in CT findings were not significant. Echocardiography has advantages as a noninvasive tool for the evaluation of cardiac structure, function and hemodynamics in patients with FM.

The Value of C-Arm Computed Tomography in Addition to Conventional Digital Subtraction Angiography in the Diagnostic Work-up of Patients with Suspected Chronic Thromboembolic Pulmonary Hypertension: An Update of 300 Patients

RATIONALE AND OBJECTIVES

To assess the value and possible benefit of combined C-arm computed tomography (CACT) and conventional digital subtraction angiography (DSA) of the pulmonary arteries in the diagnostic work-up of patients with suspected chronic thromboembolic pulmonary hypertension (CTEPH).

MATERIALS AND METHODS

We evaluated 308 pulmonary artery angiographies of 308 consecutive patients with suspected CTEPH. Seven patients were excluded because of incomplete imaging. Thus, 301 datasets were included in our study. The pulmonary artery segments and their subsegmental branching were independently evaluated by two readers (R1, R2) using both, DSA and CACT for optimal image quality. Subsequently, the diagnostic findings were compared. Inter-modality and inter-observer agreement were calculated. Consensus reading was done and correlated to a standard of reference, representing the overall consensus of both modalities. Fisher's exact test and Cohen's Kappa were applied.

RESULTS

A total of 5719 pulmonary segments were evaluated of which only 28 segments (0.4%) were rated to be nondiagnostic on both, CACT and DSA. Overall, 5640 (98.6%) and 5600 (97.9%) pulmonary segments were rated to be diagnostic in DSA and CACT, respectively. The main causes of nondiagnostic image quality were motion artifacts on both, CACT (R1:81, R2:50) and DSA (R1:60, R2:48). Interobserver agreement was excellent for DSA (κ = 0.9) and CACT (κ = 0.91) and intermodality agreement was substantial (R1: κ = 0.69, R2: κ = 0.77). Compared to standard of reference, the intermodality agreement for CACT was excellent (κ = 0.96), whereas it was inferior for DSA (κ = 0.75), due to the higher number of pathologic findings in CACT read as normal on DSA.

CONCLUSION

CACT of the pulmonary arteries can provide additional information to DSA during CTEPH work-up. Moreover, the combination of CACT and DSA can minimize the portion of non-diagnostic examinations, therefore being a reasonable combination to optimize the diagnostic work-up.

Safety and efficacy of balloon pulmonary angioplasty in a Portuguese pulmonary hypertension expert center

INTRODUCTION

Balloon pulmonary angioplasty (BPA) is an alternative therapy in patients with inoperable chronic thromboembolic pulmonary hypertension (CTEPH) or residual/recurrent pulmonary hypertension (PH) after surgery. The aim of this study was to assess the short-term efficacy and safety of a BPA program.

METHODS

This prospective single-center study included all BPA sessions performed in CTEPH patients between 2017 and 2019. Clinical assessment including WHO functional class, plasma biomarkers, 6-min walk test (6MWT) and right heart catheterization was performed at baseline and six months after the last BPA session.

RESULTS

A total of 57 BPA sessions were performed in 11 CTEPH patients (64% with inoperable disease, 82% under pulmonar vasodilator therapy). Nine patients completed both the BPA program and a minimum six-month follow-up period. There were significant improvements in WHO functional class (p=0.004) and 6MWT (mean increase of 42 m; p=0.050) and a trend for significant hemodynamic improvement: 25% decrease in mean pulmonary artery pressure (mPAP) (p=0.082) and 42% decrease in pulmonary vascular resistance (PVR) (p=0.056). In the group of patients with severely impaired hemodynamics (three patients with mPAP >40 mmHg), the reduction was significant: 51% in mPAP (p=0.013) and 67% in PVR (p=0.050). Prostacyclin analogs and long-term oxygen therapy were withdrawn in all patients. Minor complications were recorded in 25% of patients. There were no major complications or deaths.

CONCLUSIONS

A BPA strategy on top of pulmonary vasodilator therapy further improves symptoms, exercise capacity and hemodynamics with an acceptable risk-benefit ratio in patients with inoperable CTEPH or residual/recurrent PH after surgery.

Interventional Management of Chronic Thromboembolic Pulmonary Hypertension

Chronic thromboembolic pulmonary hypertension is a distinct form of pulmonary hypertension characterized by the nonresolution of thrombotic material in the pulmonary tree; whenever feasible and safe, first-line treatment should be pulmonary thromboendarterectomy. In patients who are not operative candidates, balloon pulmonary angioplasty (BPA) has emerged as an effective treatment modality that results in improvements in functional class, symptoms, hemodynamics, 6-minute walk distance, and right ventricular and pulmonary artery mechanics. Careful attention to procedural technique and rapid identification and treatment of complications are critical for a successful BPA program.

Balloon Pulmonary Angioplasty in Patients With Inoperable or Recurrent/Residual Chronic Thromboembolic Pulmonary Hypertension: A Single-Centre Initial Experience

BACKGROUND

Patients with inoperable chronic thromboembolic pulmonary hypertension (CTEPH) are often treated with pulmonary arterial hypertension-specific drugs. However, most of these patients remain symptomatic, despite medical treatment. Balloon pulmonary angioplasty (BPA) is an emerging therapeutic intervention for patients with inoperable CTEPH. This study aimed to report the initial experience of BPA in a tertiary referral centre for CTEPH.

METHODS

A total of 26 consecutive patients, who underwent 91 BPA sessions, were included in the study. All patients underwent a detailed examination, including 6-minute walking distance (6MWD), and right heart catheterisation at baseline and 3 months after the last BPA session.

RESULTS

The mean age of the patients was 51±17 years. Fifteen (15) patients had inoperable CTEPH and 11 patients had residual or recurrent CTEPH post pulmonary endarterectomy (PEA). Functional class improved in 17 of 26 (65%) patients. The 6MWD increased from a mean 315±129 to 411±140 m (p<0.001), and NT pro-BNP reduced from a median 456 to 189 pg/mL (p=0.001). The number of patients who required supplemental oxygen decreased from 11 (42.3%) to five (19%) (p=0.031) after BPA treatment. The mean pulmonary artery pressure decreased from a mean 47.5±13.4 to 38±10.9 mmHg (p<0.001), the pulmonary vascular resistance decreased from a mean 9.3±4.7 to 5.8±2.8 Wood units (p<0.001), and the cardiac index increased from a mean 2.4±0.7 to 2.9±0.6 L/min/m² (p=0.008).

CONCLUSIONS

Balloon pulmonary angioplasty improved haemodynamics, 6MWD, and functional class, and reduced the requirement for supplemental oxygen, with an acceptable risk-benefit ratio in patients with inoperable CTEPH and with residual/recurrent CTEPH.

The long-term survival in patients with chronic thromboembolic pulmonary hypertension: experience from a single center in China

The long-term prognosis of patients with chronic thromboembolic pulmonary hypertension (CTEPH) receiving different treatments is deserved to be analyzed in modern era of CTEPH treatment. From 2013 to 2019, a total of 364 patients diagnosed with CTEPH were retrospectively included, 14 patients were lost during follow-up. Among 350 patients included in the final analysis: 123 underwent pulmonary endarterectomy (PEA), 121 received balloon pulmonary angioplasty (BPA), and 106 treated with targeted drug alone. The median period of follow-up was 51.2 months, the estimated survival at 1-, 3-, 5- and 7-year was 97.1%, 93.3%, 86.9%, and 82.0% for the whole cohort; 100%, 99.20%, 96.5% and 92.5% in PEA group; 98.4%, 97.4%, 95.3% and 89.3% in BPA group;92.5%, 81.9%, 70.1% and 66.8% in patients who received targeted drug alone. In comparing with targeted treatment along, results of multivariate Cox analysis after adjusting the confounders showed that receiving PEA decreased the risk of death by 83% (HR [hazard ratio] 0.17, 95% CI [Confidence interval] 0.07-0.44) and receiving BPA decreased the risk of death by 89% (HR 0.11, 95% CI 0.04-0.29). In conclusion, the estimated survival of CTEPH patients at 1-, 3-, 5- and 7-year was 97.1%, 93.3%, 86.9%, and 82.0% respectively. The intervention of revascularization, including PEA and BPA, were preferred than treating with targeted drug alone in the view of long-term prognosis of CTEPH.

Balloon pulmonary angioplasty protocol in a Portuguese pulmonary hypertension expert center

INTRODUCTION

Balloon pulmonary angioplasty (BPA) has emerged as a promising therapeutic option for patients with chronic thromboembolic pulmonary hypertension (CTEPH) who are not eligible for pulmonary thromboendarterectomy (PEA) or who have recurrent or persistent pulmonary hypertension after surgery. There is no standardized technique for BPA and, its complexity and high risk of severe complications, requires skills and appropriate training and should be reserved for expert CTEPH centers, as a complementary intervention to medical and surgical therapy.

OBJECTIVE

The purpose of this document is to describe the BPA protocol used at a high-volume center nationwide, validated by its results.

METHODS

The present protocol includes technical details, definition of outcomes and complications, as well as patient full diagnostic work-up and treatment algorithm, before and after BPA.

RESULTS

The technical, hemodynamic, and clinical results of the application of this protocol will be subject of a later publication where they will be described in detail. In conclusion, we present a percutaneous intervention protocol in the treatment of pulmonary hypertension in the context of chronic pulmonary thromboembolism, validated by its clinical, hemodynamic, and technical results.

Effect of Balloon Pulmonary Angioplasty on Homogenization of Lung Perfusion Blood Volume by Dual-Energy Computed Tomography in Patients with Chronic Thromboembolic Pulmonary Hypertension

OBJECTIVE

Balloon pulmonary angioplasty (BPA) is used to treat patients with inoperable chronic thromboembolic pulmonary hypertension (CTEPH); the goal is to improve pulmonary perfusion. We aimed to evaluate lung perfusion blood volume (PBV) with haemodynamic and exercise-capacity parameters to assess the efficacy of BPA in the treatment of CTEPH.

METHODS

We retrospectively studied 33 patients over a 6-year period. DECT pulmonary angiography was performed before and after BPA. DECT provided iodine distribution maps; whole-lung and regional PBV images and quantification were generated using post-processing software. A mosaic pattern suggesting perfusion inhomogeneity is typical in CTEPH. Hypothetically, BPA treatment would promote homogenization that would be reflected in the calculated standard deviation.

RESULTS

Lung perfusion images showed decreased heterogeneity after BPA. There was a significant difference before and after BPA in the whole-lung PBV and in the regional standard deviation for pulmonary arterial pressure (R = 0.37, p = 0.032 and R = 0.57, p = 0.006), pulmonary vascular resistance (R = 0.51, p = 0.023 and R = 0.60, p = 0.002), transtricuspid pressure gradient (R = 0.50, p = 0.0028 and R = 0.61, p = 0.0001), brain natriuretic peptide (R = 0.54, p = 0.0012 and R = 0.46, p = 0.0078), and 6-min walking distance (R = 0.59, p = 0.003 and R = 0.26, p = 0.14). The effects were especially pronounced after the first BPA procedure.

CONCLUSION

Decreased lung heterogeneity may suggest BPA efficacy in treating CTEPH. After BPA treatment, improved lung PBV and improved regional standard deviation showed a strong positive correlation with haemodynamic parameters and exercise capacity, which also suggests that BPA is effective in treating CTEPH.

Balloon pulmonary angioplasty protocol in a Portuguese pulmonary hypertension expert center

INTRODUCTION

Balloon pulmonary angioplasty (BPA) has emerged as a promising therapeutic option for patients with chronic thromboembolic pulmonary hypertension (CTEPH) who are not eligible for pulmonary thromboendarterectomy (PEA) or who have recurrent or persistent pulmonary hypertension after surgery. There is no standardized technique for BPA and, its complexity and high risk of severe complications, requires skills and appropriate training and should be reserved for expert CTEPH centers, as a complementary intervention to medical and surgical therapy.

OBJECTIVE

The purpose of this document is to describe the BPA protocol used at a high-volume center nationwide, validated by its results.

METHODS

The present protocol includes technical details, definition of outcomes and complications, as well as patient full diagnostic work-up and treatment algorithm, before and after BPA.

RESULTS

The technical, hemodynamic, and clinical results of the application of this protocol will be subject of a later publication where they will be described in detail. In conclusion, we present a percutaneous intervention protocol in the treatment of pulmonary hypertension in the context of chronic pulmonary thromboembolism, validated by its clinical, hemodynamic, and technical results.

Raising the bar to ultradisciplinary collaborations in management of chronic thromboembolic pulmonary hypertension

Chronic thromboembolic pulmonary hypertension is an underdiagnosed and potentially fatal subgroup of pulmonary hypertension, if left untreated. Clinical signs include exertional dyspnea and non-specific symptoms. Diagnosis requires multimodality imaging and heart catheterization. Pulmonary endarterectomy, an open heart surgery, is the gold standard treatment of choice in selected patients in specialized centers. Targeted medical therapy and balloon pulmonary angioplasty can be effective in high-risk patients with significant comorbidities, distal pulmonary vascular obstructions, or recurrent/persistent pulmonary hypertension after pulmonary endarterectomy. Currently, there is a limited number of data regarding novel coronavirus-2019 infection in patients with chronic thromboembolic pulmonary hypertension and the changing spectrum of the disease during the pandemic. Challenging times during this outbreak due to healthcare crisis and relatively higher case-fatality rates require convergence; that is an ultradisciplinary collaboration, which crosses disciplinary and sectorial boundaries to develop integrated knowledge and new paradigms. Management strategies for the "new normal" such as virtual care, preparedness for further threats, redesigned standards and working conditions, reevaluation of specific recommendations, and online collaborations for optimal decisions for chronic thromboembolic pulmonary hypertension patients may change the poor outcomes.

Safety and efficacy of balloon pulmonary angioplasty in a Portuguese pulmonary hypertension expert center

INTRODUCTION

Balloon pulmonary angioplasty (BPA) is an alternative therapy in patients with inoperable chronic thromboembolic pulmonary hypertension (CTEPH) or residual/recurrent pulmonary hypertension (PH) after surgery. The aim of this study was to assess the short-term efficacy and safety of a BPA program.

METHODS

This prospective single-center study included all BPA sessions performed in CTEPH patients between 2017 and 2019. Clinical assessment including WHO functional class, plasma biomarkers, 6-min walk test (6MWT) and right heart catheterization was performed at baseline and six months after the last BPA session.

RESULTS

A total of 57 BPA sessions were performed in 11 CTEPH patients (64% with inoperable disease, 82% under pulmonary vasodilator therapy). Nine patients completed both the BPA program and a minimum six-month follow-up period. There were significant improvements in WHO functional class (p=0.004) and 6MWT (mean increase of 42 m; p=0.050) and a trend for significant hemodynamic improvement: 25% decrease in mean pulmonary artery pressure (mPAP) (p=0.082) and 42% decrease in pulmonary vascular resistance (PVR) (p=0.056). In the group of patients with severely impaired hemodynamics (three patients with mPAP >40mmHg), the reduction was significant: 51% in mPAP (p=0.013) and 67% in PVR (p=0.050). Prostacyclin analogs and long-term oxygen therapy were withdrawn in all patients. Minor complications were recorded in 25% of patients. There were no major complications or deaths.

CONCLUSIONS

A BPA strategy on top of pulmonary vasodilator therapy further improves symptoms, exercise capacity and hemodynamics with an acceptable risk-benefit ratio in patients with inoperable CTEPH or residual/recurrent PH after surgery.

Sickle cell disease related chronic thromboembolic pulmonary hypertension: challenging clinical scenario

Sickle cell disease (SCD), a haemoglobinopathy characterized by chronic haemolysis with acute exacerbations and vascular occlusion episodes, may be complicated by pulmonary hypertension. The latter may be caused by chronic thromboembolic disease of pulmonary artery branches and its management is not well-defined. Herein, we present a case of SCD complicated by chronic thromboembolic pulmonary hypertension of subsegmental pulmonary artery branches successfully treated with endothelin receptor antagonists, orally administered prostacyclin analogs and balloon pulmonary angioplasty. This challenging case highlights the need for clinical awareness of chronic thromboembolic pulmonary hypertension as a specific and potentially curable form of pulmonary hypertension complicating SCD course that may necessitate combined pharmacologic and interventional management.

Balloon pulmonary angioplasty in chronic thromboembolic pulmonary hypertension

Chronic thromboembolic pulmonary hypertension (CTEPH) is caused by chronic stenosis or obstruction of the pulmonary arteries due to thromboembolism. Although previous studies have shown untreated CTEPH has a poor prognosis, the establishment of gold-standard therapies including pulmonary endarterectomy, balloon pulmonary angioplasty (BPA), and medical therapy has improved hemodynamics and right ventricular function, leading to good long-term survival. BPA is an important therapy for patients with inoperable CTEPH, although the procedure is currently limited to specific institutions and operators. This review discusses the development of the rapidly evolving field of CTEPH that includes improvements in imaging modalities and advances in surgical and interventional techniques.

Efficacy and safety of balloon pulmonary angioplasty for residual pulmonary hypertension after pulmonary endarterectomy

BACKGROUND

Pulmonary endarterectomy (PEA) is the standard treatment for chronic thromboembolic pulmonary hypertension (CTEPH), although some patients may experience residual pulmonary hypertension (PH). It is unclear whether balloon pulmonary angioplasty (BPA) is effective for residual PH after PEA. This study aimed to compare the BPA outcomes between patients with residual PH after PEA and those with inoperable CTEPH.

METHODS

This retrospective study compared BPA for residual PH after PEA (25 patients, 101 BPA sessions) and BPA alone for inoperable CTEPH (21 patients, 89 BPA sessions). All patients underwent right heart catheterisation and functional and laboratory tests before PEA or before and after BPA.

RESULTS

There was no difference in the number of BPA sessions per patient (4.0 ± 1.9 vs. 4.2 ± 1.9, p = 0.671). No significant differences were observed with respect to the mean pulmonary artery pressure (23.6 ± 9.1 vs. 21.9 ± 5.7 mmHg, p = 0.44), pulmonary vascular resistance (3.7 ± 0.5 vs. 2.8 ± 1.2 Wood units, p = 0.14), 6-min walking distance (392.1 ± 117.7 vs. 452.4 ± 90.1 m, p = 0.096), and World Health Organization functional class (I/II/III/IV: 14/11/0/0 vs. 9/12/0/0, p = 0.375). Severe haemoptysis requiring embolisation was more common in the PH after PEA group (16.0% vs. 5.4%, p = 0.018). However, no patients required mechanical ventilation or extracorporeal membrane oxygenation, and there were no procedural deaths.

CONCLUSION

Although BPA might be effective for residual PH after PEA, it was associated with a high rate of haemoptysis.

Effect of Living Environment Factors on Quality of Life in Patients With Chronic Thromboembolic Pulmonary Hypertension After Completion of Balloon Pulmonary Angioplasty - A Cross-Sectional Study

Background: This study investigated factors related to quality of life (QoL) in patients with chronic thromboembolic pulmonary hypertension who completed balloon pulmonary angioplasty (BPA).

Methods and Results: Patient QoL and living environment after BPA were evaluated prospectively using the 5-level EQ-5D questionnaire and International Physical Activity Questionnaire Environmental Module (IPAQ-E), respectively. Patients were mailed copies of both surveys. In addition, we reviewed patient charts and collected retrospective clinical data. Relationship between the clinical data and QoL and environmental living factors were investigated. Of the 33 subjects mailed the surveys, sufficient responses were obtained from 22 (71%). Spearman’s rank correlation coefficient showed that psychiatric disorders (r=−0.6865, P<0.01) and IPAQ-E Question 5 (r=0.5192, P=0.02), Question 6 (r=0.5265, P=0.02), and Question 13 (r=0.4552, P=0.04) were significantly correlated with EQ-5D scores after BPA.

Conclusions: A living environment that was difficult to walk around was associated with a worse QoL. A multidisciplinary approach will be required to improve QoL even after completion of BPA treatment.

Assessment of oxygenation after balloon pulmonary angioplasty for patients with inoperable chronic thromboembolic pulmonary hypertension

BACKGROUND

The efficacy of balloon pulmonary angioplasty (BPA) in patients with inoperable chronic thromboembolic pulmonary hypertension would be promising. However, some patients showed residual dyspnea or symptoms, despite normalized hemodynamics. We aimed to clarify the clinical impact of oxygenation parameters on BPA outcome.

METHOD

Ninety-nine consecutive patients who underwent BPA from September 2011 to December 2019 were enrolled. We evaluated hemodynamics with right heart catheterization, arterial blood gas examination, New York Heart Association functional class (NYHA-FC), respiratory function tests, nocturnal oximetry, and exercise capacity (6-min walk test and cardiopulmonary exercise testing) at baseline and after BPA.

RESULT

Nearly normal hemodynamics was achieved after BPA (mean pulmonary artery pressure (PAP): 37.5 ± 10.0 to 20.6 ± 4.9 mmHg, p < 0.01). Oxygenation slightly improved (partial pressure of arterial oxygen; 61.5 ± 12.3 to 67.7 ± 12.7 mmHg, p < 0.01). Exertional desaturation remained unchanged (-8.1 ± 4.8 to -7.8 ± 5.1, p = 0.59), and this was associated with residual symptom (NYHA-FC ≥ 2) after BPA (OR 0.591, 95% CI 0.416-0.840, p = 0.003) in multivariate regression analyses. Lower vital capacity (r² = 0.03, p = 0.01), higher mean PAP (r² = 0.08, p = 0.02), and higher minute ventilation/carbon dioxide production (VE/VCO₂) slope (r² = 0.18, p < 0.01), the marker of ventilatory inefficiency, were correlated with exertional desaturation after BPA in multivariate linear analyses.

CONCLUSION

Although hemodynamics nearly normalized, oxygenation did not. Moreover, exertional desaturation remained unchanged. This might cause residual symptom after BPA. Residual pulmonary hypertension suggesting incurable arteriopathy, and higher VE/VCO₂ slope suggesting ventilation-perfusion mismatch might be related to exertional desaturation. Domiciliary oxygen therapy should be continued, if necessary.

In-Depth Analysis of a Case of Persistent Severe Chronic Thromboembolic Pulmonary Hypertension

Pulmonary hypertension (PH) is a disease characterized by an increase in the pulmonary vascular resistance that typically progresses to right heart failure and death. It is classified into five groups. Management depends on the group classification. Group four PH, chronic thromboembolic pulmonary hypertension (CTEPH) is thought to be a result of acute pulmonary emboli that cause fibrosis and scarring of the pulmonary arteries with consequent obstruction. The diagnosis of CTEPH is made by identifying perfusion abnormalities on ventilation/perfusion (V/Q) scan. Other studies required for the diagnostic evaluation include transthoracic echocardiogram, right heart catheterization, NT pro-B-type natriuretic peptide and thrombophilia evaluation. Several other tests needed to exclude other causes of pulmonary hypertension include high-resolution computed tomography (HRCT), connective tissue disease evaluation, thyroid function testing, human immunodeficiency virus testing, and liver ultrasonography to exclude portal hypertension. The treatment for CTEPH is surgical pulmonary endarterectomy (PEA). In patients who are not candidates or decline PEA, pulmonary balloon angioplasty may be useful, however, further studies are required. Several pulmonary artery hypertension medications have been studied in the management of inoperable CTEPH or persistent PH following PEA including bosentan (improves hemodynamics but not exercise capacity), macitentan (improves both hemodynamics and clinical parameters), and riociguat (improves both hemodynamics and exercise capacity). However, only riociguat is approved by the Food and Drug Administration for this indication.

[A retrospective study of balloon pulmonary angioplasty for chronic thromboembolic pulmonary hypertension]

Objective: To analyze the efficacy and safety of Balloon Pulmonary Angioplasty (BPA) in patients with Chronic Thromboembolic Pulmonary Hypertension (CTEPH). Methods: A total of 38 CTEPH patients received at least one BPA treatment between February 2017 and April 2019 were enrolled. World Health Organization functional class(WHO-FC), 6-minute walking distance(6WMD), mean pulmonary artery pressure (mPAP), pulmonary vascular resistance(PVR), N-terminal pro brain natriuretic peptide(NT-proBNP) and echocardiographic indicators were collected at baseline and before each BPA procedure. Results: 38 patients received 95 times of BPA [ 2 (1, 4) times per person] totally. MPAP was 50 (43, 56) mmHg(1 mmHg=0.133 kPa) before BPA and 41(32, 50) mmHg after at least one BPA procedure, P<0.001. MPAP decreased from 50(42, 55) to 34(28, 49) mmHg (P=0.003) in 17 cases after 3-5 BPA procedures. In 15 cases, PVR decreased from 852(583, 1 140)dyn·s·cm^-5 to 496(406, 802)dyn·s·cm^-5, P=0.009. Besides, there were 13 patients with WHO Function Class Ⅰ/Ⅱ before BPA, 25 patients with Ⅲ/Ⅳ class before BPA, 29 patients with Ⅰ/Ⅱ class after BPA treatment, and 9 patients with Ⅲ/Ⅳ after BPA treatment, P<0.001. 6 WMD before and after BPA increased from 360(290, 442)m to 449(376, 505)m, P=0.015. The Meyer score of lung perfusion scanning got improved, from 0.54(0.53, 0.58) to 0.50(0.44, 0.58), P<0.001. Among all registered patients, 21 of whom NT-proBNP decreased from 1 285(606, 2 794) to 472(148, 745), P=0.014. The inner diameter of the right ventricular decreased from 54(41, 54)mm before surgery to 42(34, 49)mm after surgery, P<0.001. 6(6.3%, 6/95) complications occurred in 95 times of BPA. Conclusion: For inoperable patients with CTEPH, BPA can significantly improve disease severity, 6 MWD, heart function, decrease mPAP, PVR and improve lung perfusion, which is a safe and effective therapy.

Evolution of patients with chronic thromboembolic pulmonary hypertension treated by balloon pulmonary angioplasty, according to their anticoagulant regimens

Patients with chronic thromboembolic pulmonary hypertension (CTEPH) need anticoagulant therapy for life. Conventionally, vitamin K antagonists (VKAs) have been used and data about direct oral anticoagulants (DOACs) in CTEPH patients are lacking. Recently, balloon pulmonary angioplasty (BPA) has emerged as a treatment option for CTEPH. However, there are no reports examining the effects of DOACs and VKAs on the hemodynamics of patients after BPA. The aim of this study was to compare DOACs and VKAs regarding the hemodynamic changes in patients with CTEPH treated by BPA. Patients who were treated by BPA and underwent follow-up right heart catheterization 6 ± 1 months after the final BPA procedure were included in this study. The subjects were divided into two groups based on the anticoagulant administered, and hemodynamic changes (mean pulmonary artery pressure, mPAP; pulmonary vascular resistance, PVR; cardiac index, CI) were assessed. Of the 65 consecutive patients, 29 met the inclusion criteria (DOAC-group n = 14, VKA-group n = 15). Compared to pre-BPA, post-BPA hemodynamic parameters were improved in both groups. There was no significant difference between the two groups regarding pre-BPA, post-BPA, 6Mo-f/u and Δhemodynamic parameters (difference between 6Mo-f/u and post-BPA, ΔmPAP, - 0.7 ± 3.3 vs. - 2.7 ± 5.4 mmHg, p = 0.24; ΔPVR, - 41.9 ± 80.9 vs. - 16.4 ± 74.1 dyne s/cm⁵, p = 0.38; ΔCI, - 0.06 ± 0.35 vs. - 0.10 ± 0.35 L/min/m², p = 0.80; DOAC-group vs. VKA-group, respectively). Hemodynamic improvement by BPA was maintained over 6 months of follow-up irrespective of the type of anticoagulant administered in CTEPH patients.

pulmonary endarterectomy in patients with chronic thromboembolic pulmonary hypertension: a systematic review and meta-analysis

Although balloon pulmonary angioplasty (BPA) and pulmonary endarterectomy (PEA) are effective in chronic thromboembolic pulmonary hypertension (CTEPH), the comparison of their efficacy and safety is still unclear. We identified studies through a systematic review of PubMed, Cochrane Library, and Embase and used a random effects meta-analysis model to synthesize estimates of weighted mean differences or combined effect size. In total, 54 studies were included in this meta-analysis. The survival rates at perioperative/in-hospital period, 2 years, and 3 years were 100%, 99%, and 97%, respectively, in BPA group and 93%, 90%, and 88%, respectively, in PEA group. The variation of 6-min walk distance was 141.80 m in BPA and 100.73 m in PEA when the follow-up was 1-6 months. At < 1-month, 1-6-month, and > 12-month follow-up, the changed results of mean pulmonary arterial pressure were - 18.31, - 17.00, and - 12.97 mmHg in BPA group and - 18.93, - 21.21, and - 21.35 mmHg in PEA group. At < 1-month and 1-6-month follow-up, the changed values of pulmonary vascular resistance were - 542.24 and - 599.77 dyne•s•cm^-5 in PEA group and - 443.49 and - 280.00 dyne•s•cm^-5 in BPA group. In addition, there was more wide variety of complications in PEA group than in BPA group. BPA might have higher survival rate (perioperative/in-hospital period, 2-year and 3-year follow-up) and fewer types of complications compared with PEA. The improvement in exercise capacity (1-6-month follow-up) in the BPA group might be more pronounced than in PEA group. Moreover, PEA might be superior in improvement of hemodynamic parameters (< 1-month, 1-6-month, and > 12-month follow-up).

Interventional and pharmacological management of chronic thromboembolic pulmonary hypertension

Chronic thromboembolic pulmonary hypertension (CTEPH) is caused by obstruction of the pulmonary vasculature, leading to increased pulmonary vascular resistance and ultimately right ventricular failure, the leading cause of death in non-operated patients. This article reviews the current management of CTEPH. The standard of care in CTEPH is pulmonary endarterectomy (PEA). However, up to 40% of patients with CTEPH are ineligible for PEA, and up to 51% develop persistent/recurrent PH after PEA. Riociguat is currently the only medical therapy licensed for treatment of inoperable or persistent/recurrent CTEPH after PEA based on the results of the Phase III CHEST-1 study. Studies of balloon pulmonary angioplasty (BPA) have shown benefits in patients with inoperable or persistent/recurrent CTEPH after PEA; however, data are lacking from large, prospective, controlled studies. Studies of macitentan in patients with inoperable CTEPH and treprostinil in patients with inoperable or persistent/recurrent CTEPH showed positive results. Combination therapy is under evaluation in CTEPH, and long-term data are not available. In the future, CTEPH may be managed by PEA, medical therapy or BPA - alone or in combination, according to individual patient needs. Patients should be referred to experienced centers capable of assessing and delivering all options.

Chronic Thromboembolic Pulmonary Hypertension: the Bedside

PURPOSE OF REVIEW

Chronic thromboembolic pulmonary hypertension (CTEPH), included in group 4 PH, is an uncommon complication of acute pulmonary embolism (PE), in which emboli in the pulmonary vasculature do not resolve but rather form into an organized scar-like obstruction which can result in right ventricular (RV) failure. Here we provide an overview of current diagnosis and management of CTEPH.

RECENT FINDINGS

CTEPH management is complex with treatments that range from surgery, percutaneous interventions, to medical therapies. Current CTEPH medical therapies have largely been repurposed from pulmonary arterial hypertension (PAH). The diagnosis of CTEPH can be challenging, requiring a multimodality approach to differentiate from disease mimics. While these treatments improve symptoms, they may not reverse the underlying pathology of CTEPH.

The role of balloon pulmonary angioplasty and pulmonary endarterectomy: Is chronic thromboembolic pulmonary hypertension still a life-threatening disease?

BACKGROUND

The management of non-operable chronic thromboembolic pulmonary hypertension (CTEPH) has evolved with the availability of balloon pulmonary angioplasty (BPA) and pulmonary vasodilators. We launched the BPA program in 2011. The aim was to analyze the survival and treatment efficacy of our CTEPH treatment program in the modern management era.

METHODS AND RESULTS

We retrospectively reviewed data from 143 consecutive CTEPH patients diagnosed from January 2011 (i.e. after the availability of BPA) to December 2019. Of forty-one patients who underwent pulmonary endarterectomy (PEA), 25 underwent additional BPA (Combination group) and the others were treated with only PEA (PEA group). Ninety patients underwent BPA (BPA group). The remaining 12 patients did not undergo any interventional treatments. The 1- and 5-year survival rates of operated patients (n = 41) were 97.4% and 90.0%, compared to 96.9% and 86.9% in not-operated patients (n = 102), respectively (p = 0.579). There was no mortality in the Combination group. Mean pulmonary artery pressure after treatments in the PEA only, Combination, and BPA only groups was 20.5 ± 6.7, 17.9 ± 4.9, and 20.7 ± 4.6 mmHg, respectively (p = 0.067, one-way ANOVA). Percent decrease of pulmonary vascular resistance in each treatment groups was -73.7 ± 11.3%, -74.3 ± 11.8%, and - 54.9 ± 22.5%, respectively (p < 0.01, one-way ANOVA).

CONCLUSION

There was no significant difference in long-term survival between operated and not-operated CTEPH. Moreover, the Combination approach might have the potential to introduce notable improvements in the prognosis of CTEPH. BPA and PEA appear to be mutually complementary therapies in the modern management era.

Preoperative balloon pulmonary angioplasty for chronic thromboembolic pulmonary hypertension led to successful anesthetic management for total hysterectomy under general anesthesia: a case report

Background

Chronic thromboembolic pulmonary hypertension (CTEPH) is a disease of obstructive pulmonary artery remodeling as a consequence of major vessel thromboembolism. Balloon pulmonary angioplasty (BPA) is an alternative treatment for patients with inoperable CTEPH. We report a case of CTEPH which improved following preoperative BPA intervention, allowing total hysterectomy to be performed.

Case presentation

A 48-year-old woman was transferred to our hospital to undergo total hysterectomy for endometrial cancer. She developed pulmonary embolism 7 months ago at another hospital, and a diagnosis of CTEPH was made based on multiple pulmonary emboli and pulmonary hypertension at our institute. Two BPA sessions for seven branches of the bilateral pulmonary arteries were conducted, resulting in a decrease of mean pulmonary artery pressure from 54 to 33 mmHg. Total hysterectomy was successfully performed under general anesthesia without any complications.

Conclusions

BPA could be effective for reducing PH in patients with CTEPH undergoing noncardiac surgery.

Chronic thromboembolic pulmonary hypertension in Spain: a decade of change

INTRODUCTION AND OBJECTIVES

Chronic thromboembolic pulmonary hypertension (CTEPH) treatment has evolved in the last decade. However, there is scarce information on the long-term impact of this progress in a real-life population at a national level. This study was designed to analyze the characteristics of CTEPH patients in Spain over the last decade.

METHODS

We prospectively collected epidemiological, clinical, and prognostic data from CTEPH patients consecutively included in the Spanish REHAP registry from January 1, 2007, to December 31, 2018. We evaluated differences over time, establishing 2013 as the reference date for analysis. Propensity scores for interventional treatment were calculated using a multivariable logistic regression model.

RESULTS

A total of 1019 patients were included; 659 (64.4%) were evaluated at a national CTEPH center. Overall, 350 patients (34.3%) were selected for surgery and 97 (9.6%) for percutaneous treatment. Patients diagnosed between 2007 and 2012 died more frequently than those diagnosed from 2013 onward (HR, 1.83; 95%CI, 1.07-3.15; P=.027). Within the subgroup of patients adjusted by propensity score, baseline pulmonary vascular resistance and the 6-minute walk test distance also determined the outcome (HR, 1.24; 95%CI, 1.15-1.33; P=.011; and HR, 0.93; 95%CI, 0.90-0.97; P=.001, respectively). High survival rates were found in patients who underwent an invasive procedure (pulmonary endarterectomy or balloon pulmonary angioplasty).

CONCLUSIONS

CTEPH diagnosis and prognosis have consistently improved in the last decade. Baseline disease severity determines the risk profile. Patients who undergo pulmonary endarterectomy or balloon pulmonary angioplasty have better outcomes.

Balloon pulmonary angioplasty for chronic thromboembolic pulmonary hypertension: State of the art

Chronic thromboembolic pulmonary hypertension (CTEPH) is a complex chronic disease in which pulmonary artery stenosis or obstruction caused by organized thrombus can lead to increased pulmonary artery pressure and pulmonary vascular resistance, ultimately triggering progressive right heart failure and death. Currently, its exact mechanism is not fully understood. Pulmonary endarterectomy (PEA) has immediate effects with low perioperative mortality and satisfactory prognosis in experienced expert centers for CTEPH patients with proximal lesions. Nevertheless, 37% of patients are deemed unsuitable for PEA surgery due to comorbidities and other factors, and nearly half of the operated patients have residual or recurrent pulmonary hypertension. Riociguat is the only approved drug for CTEPH, although its effect is limited. Balloon pulmonary angioplasty (BPA) is a promising alternative treatment for patients with CTEPH. After more than 30 years of development and refinements, emerging evidence has confirmed its role in patients with inoperable CTEPH or residual/recurrent pulmonary hypertension, with acceptable complications and comparable long-term prognosis to PEA. This review summarizes the pathophysiology of CTEPH, BPA history and development, therapeutic principles, indications and contraindications, interventional procedures, imaging modalities, efficacy and prognosis, complications and management, bridging and hybrid therapies, ongoing clinical trials and future prospects.