Patients’ characteristics and mortality in urgent/emergent/salvage transcatheter aortic valve replacement: insight from the OCEAN-TAVI registry

Objectives Patients’ backgrounds and clinical outcomes in urgent/emergent/salvage transcatheter aortic valve replacement (Em-TAVR) remain unclear. We investigated patient characteristics and the mortality in Em-TAVR and the predictors for the need for Em-TAVR. Methods We consecutively enrolled 1613 patients undergoing TAVR for severe aortic stenosis between October 2013 and July 2016 from the Optimised transCathEter vAlvular interventioN (OCEAN)-transcatheter aortic valve implantation (TAVI) registry. The urgency was based on the European System for Cardiac Operative Risk Evaluation II. Urgent, emergent or salvage were included with the Em-TAVR group and elective with the El-TAVR group. Results Em-TAVR was observed in 87 (5.4%) patients. A higher Clinical Frailty Scale (CFS), peripheral artery disease (PAD), hypoalbuminaemia, reduced left ventricular ejection fraction (LVEF) and preoperative at least moderate mitral regurgitation (MR) predicted the need for the Em-TAVR by the multivariate logistic regression analysis. The Em-TAVR group had the higher Society of Thoracic Surgeons Score (13.7 (IQR 8.2–21.0) vs 6.5 (IQR 4.6–9.2); p<0.001) and higher 30-day mortality (9.2% vs 1.3%; p<0.001) than the El-TAVR group. Accordingly, Kaplan-Meier analysis showed that the cumulative mortality was higher in the Em-TAVR group than that in the El-TAVR group (log-rank; p<0.001). However, Em-TAVR did not predict mortality in the multivariate Cox regression analysis. Conclusions Em-TAVR was performed in 5.4% of patients. Higher CFS, PAD, hypoalbuminaemia, reduced LVEF and preprocedural MR predicted the need for Em-TAVR. Em-TAVR was not a predictor for mortality in the multivariate analysis, suggesting that it is a reasonable treatment option.


INTRODUCTION
Transcatheter aortic valve replacement (TAVR) has emerged as a safe and effective treatment option for patients with symptomatic severe aortic stenosis (AS) who are at prohibitive, high or intermediate risk for surgical aortic valve replacement (SAVR). 1 Recently, the U.S. Food and Drug Administration approved an expanded indication for several transcatheter heart valves to include patients with severe AS at low surgical risk. 2 3

Key questions
What is already known about this subject?
► Previous studies suggested urgent/emergent/salvage transcatheter aortic valve replacement (Em-TAVR) as an effective treatment option in patients with severe aortic stenosis (AS) with acute decompensated heart failure.However, because the backgrounds of patients who underwent Em-TAVR differed across these studies, the effectiveness and safety of Em-TAVR have not been confirmed and predictors of need for Em-TAVR remain unclear.
What does this study add?
► The percentage of patients with severe AS who needed to undergo Em-TAVR in our study was 5.4%.The predictors for the need for Em-TAVR were a high Clinical Frailty Scale, a history of peripheral artery disease, hypoalbuminaemia, reduced left ventricular ejection fraction and at least moderate mitral regurgitation.Urgency did not negatively affect the mortality after TAVR according to the multivariate analysis.This is the first report on Em-TAVR from an Asian multicentre registry.

How might this impact on clinical practice?
► As the finding that Em-TAVR itself does not predict mortality, there may be no need for hesitation when deciding to perform Em-TAVR.It may be better to consider the procedure ahead of time in patients with severe AS with congestive heart failure, especially in those using catecholamines and/or mechanical circulatory support because bed rest is associated with sarcopenia, infections and a greater length of stay.on September 15, 2023 by guest.Protected by copyright.5][6][7] However, the baseline characteristics of patients who underwent emergent TAVR differed across these studies.For example, regarding a status of urgency of TAVR procedure, no 'salvage' status patient, 'emergent' with 0.2% of patients and 'urgent' with 9.7% were included in the study from the Society of Thoracic Surgeons (STS) and the American College of Cardiology Transcatheter Valve Therapy (ACC TVT) Registry. 4In contrast, another study only included patients with cardiogenic shock. 5Thus, the results of these previous studies should be interpreted with caution.The patients' backgrounds and clinical outcomes in Em-TAVR have not been thoroughly studied.
The aim of this study was to investigate the predictors for the need for Em-TAVR, and the patients' characteristics and mortality in Em-TAVR using data from a multicentre Japanese registry.

Study population and definitions
The Optimised transCathEter vAlvular interventioN TAVI (OCEAN-TAVI) registry is a Japanese multicentre prospective registry affiliated to 14 high-volume medical centres, including the Keio University School of Medicine, Teikyo University School of Medicine, New Tokyo Hospital, Kokura Memorial Hospital, Saiseikai Yokohama-City Eastern Hospital, Sendai Kosei Hospital, Shonan Kamakura General Hospital, Toyohashi Heart Center, Nagoya Heart Center, Toyama University, Tokyo bay medical centre, Osaka city university Hospital, Kishiwada tokusyu-kai Hospital and Ogaki Municipal Hospital.This trial is registered with the University Hospital Medical Information Network (UMIN; UMIN000020423).Between October 2013 and July 2016, 1613 patients with severe AS undergoing TAVR with the Edwards Sapien XT and Sapien 3 valve (Edwards Lifesciences) and the Medtronic CoreValve (Medtronic, Minneapolis, Minnesota, USA) were included in the OCEAN-TAVI registry.The inclusion criteria for this registry have been previously reported. 8atients who admitted for a planned TAVR operation were included in the elective TAVR (El-TAVR) group.The others who required unplanned hospitalisation and TAVR during the same hospitalisation were included in the Em-TAVR group.The level of urgency was defined as urgent, emergent or salvage, based on the European System for Cardiac Operative Risk Evaluation (Euro-SCORE) II risk model. 9Urgent: a status requiring unplanned hospitalisation and TAVR during the same hospital stay due to unstable symptoms, catecholamine dependency and/or a need for mechanical circulatory support (MCS), such as intra-aortic balloon pumping, extracorporeal membrane oxygenation or mechanical respiratory support.Emergent: requiring TAVR before the beginning of the next working day after the decision to operate.Salvage: requiring cardiopulmonary resuscitation (external cardiac massage) before TAVR and subsequent TAVR.

Statistical analysis
Continuous variables were assessed for normality of distribution using the Shapiro-Wilk test; those that followed a normal distribution were reported as the mean±SD, and those that did not were reported as the median and IQR.Student's t-test was performed for intergroup comparisons of parametric data, and the Mann-Whitney U test was used for intergroup comparisons of non-parametric data.Categorical variables were reported as a number (percentage) and compared using Pearson's χ 2 test or Fisher's exact test.A p<0.05 was considered statistically significant.Parameters for the prediction (p<0.05) of the need for Em-TAVR were entered into a multivariable logistic regression model.To determine independent predictors for all-cause mortality after TAVR, multivariate Cox proportional hazards models were used.Cumulative mortality was estimated by the Kaplan-Meier method, and differences were assessed with the log-rank test.JMP V.14 for Mac (SAS Institute) was used for all statistical analyses.

Procedural characteristics and in-hospital outcomes
The procedural characteristics and clinical outcomes are presented in table 2. The 30-day mortality in Em-TAVR patients was higher than in El-TAVR patients (9.2% vs 1.3%, p<0.001).Acute device success, according to the Valve Academic Research Consortium 2 definition, 10 was achieved in 76 (87.4%)Em-TAVR patients and in 1440 (94.4%)El-TAVR patients.Among the patients in our

Cumulative survival rate of the urgency of TAVR
The cumulative survival rate in Kaplan-Meier analysis was significantly lower in Em-TAVR patients compared with El-TAVR patients (log-rank test; p<0.001) (figures 1 and 2).There was a significant difference in the cumulative survival rate between El-TAVR and urgent TAVR patients (log-rank test; p<0.001) (online supplemental figure 1).However, the cumulative survival did not differ between urgent and emergent/salvage TAVR patients (log-rank test; p=0.996) (online supplemental figure 2).

Subgroup analysis in the Em-TAVR patient cohort
We performed a subgroup analysis to investigate variables associated with 1-year mortality in Em-TAVR patients.The Em-TAVR patients were divided into two groups based on whether or not they had survived for 1 year after TAVR; 20/87 (23.0%) had died with 1 year of TAVR.The baseline patient characteristics of these patients are presented in online supplemental table 2).Compared with the survivor group, the CFS Score was higher (5.6±1.4 vs 4.8±1.

DISCUSSION
We made three important clinical observations in this study.First, the percentage of patients with severe AS who needed to undergo Em-TAVR in our study was 5.4% (87/1613).Second, the predictors for the need for Em-TAVR were a high CFS, a history of PAD, hypoalbuminaemia, reduced LVEF and at least moderate MR.Although Kaplan-Meier analysis revealed that cumulative mortality was higher in Em-TAVR patients than in El-TAVR patients, the Cox regression analysis revealed that Em-TAVR was not associated with cumulative mortality after TAVR.To the best of our knowledge, this is the first report on Em-TAVR from an Asian multicentre registry.
The authors summarised the principal findings on Em-TAVR obtained from this study, the study from the STS/ACC TVT Registry 4 and the study by Frerker et al, 5 detailing the patients' characteristics, the prevalence of Em-TAVR, the acute device success rate of the TAVR procedure and the mortality rate in online supplemental table 5. Compared with the study from the STS/ACC TVT Registry, our study included patients with a higher Surgical Risk Score and showed similar mortality rates after Em-TAVR. 4 As expected, the baseline conditions of patients with Em-TAVR were significantly worse than those with El-TAVR in our study.Although the cumulative mortality after   Em-TAVR was higher than after El-TAVR, the clinical outcomes in Em-TAVR seemed to be acceptable in our study.Further, urgency did not negatively affect the mortality after TAVR (online supplemental table 1).Considering these findings, we believe that there is no need for hesitation when deciding to perform Em-TAVR.Prolonged hospitalisation due to observation treatment is inherently harmful to older patients because bed rest is associated with sarcopenia, infections and a greater length of stay. 11However, early mobilisation due to early intervention may result in a reduced length of stay and reduce the complications associated with bed rest.Thus, it may be better to plan the procedure ahead of time for patients with severe AS with congestive heart failure, especially in those using catecholamines and/or MCS.Although balloon aortic valvuloplasty (BAV) can another treatment option in an emergent setting, Bongiovanni et al showed that El-TAVR following to emergent BAV was not superior to Em-TAVR without emergent BAV in terms of survival. 6BAV may be considered when TAVR is inappropriate due to anatomical problems.This study showed that the predictors for the need for Em-TAVR were higher CFS, a history of PAD, hypoalbuminaemia, reduced LVEF and at least moderate MR (table 3).Although previous studies have shown that these factors are predictors of mortality after TAVR, [12][13][14][15][16][17][18][19][20] it was unknown whether they were also   Valvular heart disease the predictors for the need for Em-TAVR.2][23][24] Our study showed that preoperative moderate or severe MR was associated with Em-TAVR.8][19][20] Moreover, higher CFS, prior CABG, lower serum haemoglobin concentration and lower serum albumin concentration were associated with 1-year mortality after Em-TAVR (online supplemental table 4).The CFS, serum haemoglobin concentration and serum albumin concentration in our study were associated with the need for Em-TAVR and 1-year mortality after Em-TAVR.High CFS and low haemoglobin and albumin concentration level, together with, reduced LVEF or significant MR, could be signs encouraging clinicians to conduct TAVR earlier.
Regarding study limitations, a selection bias may exist in our study because the decision regarding the performance of Em-TAVR was at the discretion of the local heart team and the details of the reason for Em-TAVR were unknown.Due to the small number of the patients who underwent Em-TAVR, we could not perform multivariate analysis to identify independent predictors for 1-year mortality after Em-TAVR.

CONCLUSION
Em-TAVR was observed in 5.4% of patients in this study.The predictors for the need for Em-TAVR were identified as a higher CFS, PAD, hypoalbuminaemia, reduced LVEF and at least moderate MR.The multivariate Cox regression analysis revealed that Em-TAVR was not associated with cumulative mortality after TAVR, suggesting that Em-TAVR is a safe and reasonable treatment option.

Table 2
Procedural characteristics and in-hospital outcomes in transcatheter aortic valve replacement

Table 3
The multivariate logistic regression analysis for predictors for the need for urgent/emergent/salvage transcatheter aortic valve replacement BMI, body mass index; PAD, peripheral artery disease; eGFR, estimated glomerular filtration rate; LVEF, left ventricular ejection fraction; AVA, aortic valve area; MR, mitral regurgitation; TR, tricuspid regurgitation.