Effects and safety of extracorporeal membrane oxygenation in the treatment of patients with ST-segment elevation myocardial infarction and cardiogenic shock: A systematic review and meta-analysis

Abstract

Background:

There is a lack of large randomized controlled trials (RCTs) that comprehensively evaluate the effects of venoarterial extracorporeal membrane oxygenation (V-A ECMO)- assisted treatment of patients with ST-segment elevation myocardial infarction (STEMI) combined with Cardiogenic shock (CS). This meta-analysis aims to identify predictors of short-term mortality, and the incidence of various complications in patients with STEMI and CS treated with V-A ECMO.

Methods:

We searched PubMed, Cochrane Library, Web of Science, Embase, China National Knowledge Infrastructure (CNKI), and the Wanfang Database from 2008 to January 2022 for studies evaluating patients with STEMI and CS treated with V-A ECMO. Studies that reported on mortality in ≥ 10 adult (>18 years) patients were included. Newcastle-Ottawa Scale was used by two independent reviewers to assess methodological quality. Mantel-Haenszel models were used to pool the data for meta-analysis.

Results:

Sixteen studies (1,162 patients) were included with a pooled mortality estimate of 50.9%. Age > 65 years, BMI > 25 kg/m², lactate > 8 mmol/L, anterior wall infarction, longer CPR time, and longer time from arrest to extracorporeal cardiopulmonary resuscitation (ECPR) were risk predictors of mortality. Achieving TIMI-3 flow after percutaneous coronary intervention (PCI) was a protective factor of mortality. The prevalence of bleeding, cerebral infarction, leg ischemia, and renal failure were 22, 9.9, 7.4, and 49.4%, respectively.

Conclusion:

Our study identified Age, BMI, lactate, anterior wall infarction, TIMI-3 flow after PCI, CPR time, and time from arrest to ECPR significantly influence mortality in STEMI patients with CS requiring V-A ECMO. These factors may help clinicians to detect patients with poor prognoses earlier and develop new mortality prediction models.

Introduction

In recent years, the incidence of acute ST-segment elevation myocardial infarction (STEMI) has been increasing year by year with a trend toward younger patients (1). Cardiogenic shock (CS) is the leading cause of death in patients with myocardial infarction (MI) and occurs in approximately 8–10% of STEMI patients (2). Despite improvements in therapeutic agents, shorter door-to-balloon (D2B) time, and optimized reperfusion strategies, mortality in patients with STEMI combined with CS remains as high as 50% (3). Even after discharge, patients with STEMI combined with CS are often left with a variety of serious complications, leading to repeated hospitalizations and poor long-term prognosis (4, 5). To overcome the limitations of vasopressors, maintain adequate perfusion pressure, and prevent multi-organ failure, mechanical circulatory support (MCS) is attractive for improving hemodynamics and clinical outcomes in patients with STEMI combined with CS (6). Venoarterial extracorporeal membrane oxygenation (V-A ECMO) is a cardiopulmonary assist device, which not only oxygenates the blood but also replaces the heart to provide power for intravascular circulation, playing the role of partial or total replacement of the heart. It has been widely used in the resuscitation treatment of patients with STEMI combined with CS (7).

However, there is a lack of large RCTs that comprehensively evaluate the effects of V-A ECMO-assisted treatment of patients with STEMI combined with CS and there is a lack of well-recognized predictive scores for the assessment of patient prognosis. SAVE score (8) is the ECMO score for CS, which can be applied to all cardiovascular diseases. It is not specific to myocardial infarction, and patients with extracorporeal cardiopulmonary resuscitation (ECPR) are excluded. In addition, the SAVE score is complex and not suitable for emergent evaluation. Encourage score (9) and AMI-ECMO (10) score have emerged to assess the clinical benefit of V-A ECMO used in patients with AMI. However, the predictive ability is limited due to the fact that data is from small-scale studies, which may ignore some important risk predictors. Complications such as bleeding, vascular complications, lower limb ischemia, renal impairment, infection, and myocardial stunning are often present during V-A ECMO support, but data from large-scale studies in STEMI patients is still limited (11). How to select patients with STEMI and CS who are most likely to benefit from V-A ECMO support while avoiding excessive waste of medical resources has become a very important decision in clinical practice.

To address this knowledge gap, we conducted a systematic review and meta-analysis to evaluate the predictors of short-term mortality which was defined by 30-day and in-hospital mortality and the incidence of various complications in patients with STEMI and CS treated with V-A ECMO. The clinical evidence summarized in this study could help clinicians to select the best population for V-A ECMO supported treatment, improve awareness of complications treatment.

Methods

The protocol for this systematic review was registered on the PROSPERO database¹ and conducted following the Preferred Reporting Items for Systematic Reviews and Meta-Analyses guidelines (12).

Data sources and searches

We systematically searched and identified relevant studies from six databases, including PubMed, Cochrane Library, Web of Science, Embase, China National Knowledge Infrastructure (CNKI), and the Wanfang Database from 2008 to January 2022. Controlled vocabulary supplemented with keywords was used to search for patients with STEMI and CS treated with V-A ECMO. The detailed search strategy is presented in the Supplementary material.

Study selection, inclusion, and exclusion criteria

We performed an initial screening based on the titles and abstracts. If uncertain, full-text studies were selected for careful reading and analysis against the eligibility criteria (inclusion/exclusion). Studies that reported on mortality in ≥ 10 adults (>18 years) patients with STEMI and CS necessitating V-A ECMO were included. Studies designed as case reports, reviews, animal studies, studies without data specifically for STEMI patients, and studies without relevant outcomes were excluded. If two studies report on the same cohort or sampling from the same population, we included the study with the larger population or both studies only if they reported on different predictors.

Evaluation of study quality

The Newcastle–Ottawa scale (NOS) was used for the analysis of the quality of the studies included in this review. Using this scale, each study is categorized into three groups: selection, comparability, and outcome. For the selection and outcome categories, the studies were awarded a star for each item. For the comparability category, two stars were awarded. A study with more than six stars is considered to be of high quality, with a maximum of nine stars (13).

Data abstraction

Two researchers (Pang and Miao) independently extracted data from all eligible studies. Any differences were discussed or decided by a third reviewer. The following data were extracted from the selected studies: author, publication year, study design, number of studies, follow-up period, 30-day mortality, in-hospital mortality, the incidence of bleeding, the incidence of neurological injury, incidence of lower limb ischemia, and incidence of acute renal insufficiency. We only extracted independent predictors of all-cause mortality from multivariable analysis (estimator, effect estimate, and 95% confidence intervals [CIs]).

Data synthesis and statistical analysis

Heterogeneity among studies was estimated using the chi-square test-based I² statistic. I² Values of <50, 50–75, and >75% were classified as low, medium, and high heterogeneity, respectively. A Mantel-Haenszel model was used to calculate pooled risk ratios (RR) and 95% CI. If heterogeneity was low (P > 0.10, I² < 50%), a fixed-effect model was used to calculate the combined RR values. Otherwise, a random-effect model was used. Publication bias was estimated graphically using a funnel plot. An asymmetric funnel plot may indicate a possible publication bias. To evaluate predictors of mortality when using V-A ECMO, we used the inverse variance method to report a pooled overall estimate with its respective 95 percent confidence intervals (95% CIs). In addition, Sensitivity analysis was performed via the leave-one-out method to assess the influence of individual studies on the pooled estimate. A pooled effect estimate was calculated if the predictor was identified in more than one study using a similar or roughly similar definition. The data were analyzed using R software version 4.1.2 statistical software. A value of p < 0.05 was considered statistically significant.

Results

The search strategy identified 705 abstracts, of which 16 studies (10, 14–28), representing 1,162 patients met the inclusion criteria. Fifteen studies were retrospective cohort studies and one study was a randomized controlled trial (RCT) study. The detailed retrieval process is shown in Figure 1.

FIGURE 1

As shown in Table 1, according to the NOS, twelve studies with scores higher than six stars were considered high quality, and the remaining three studies were medium quality for five and six stars, respectively. The characteristics of the selected studies are presented in Table 2.

Mortality

Sixteen studies reported short-term mortality for patients on V-A ECMO for CS complicating STEMI (Figure 2). The pooled estimate of the OR was 0.509 [95% CI: (0.432, 0.586)] in a random effects model with significant heterogeneity (I² = 81%, P < 0.01). In sensitivity analysis, the overall effect size was not substantially affected after removing each study in turn (Supplementary Figure 1).

FIGURE 2

Predictors

A total of seven predictors of mortality were evaluated in more than one study. The summary of the pooled effect of the predictors that were meta-analyzed was provided in Figure 3.

FIGURE 3

Demographics predictors

The effect of age > 65 years on mortality was evaluated in two studies. Age greater than 65 years was associated with an increase in mortality [OR, 2.50; 95% CI: (1.48, 4.24)] (Supplementary Figure 2). The relationship between BMI > 25 kg/m² and mortality was evaluated in two studies with a total of 196 patients, all using multi-variable analysis. Pooled estimates showed a trend toward increased mortality in patients whose BMI > 25 kg/m² [OR, 3.98; 95% CI: (0.92, 17.25)] (Supplementary Figure 3).

Biochemical and angiographic predictors

The relationship between lactate > 8 mmol/L prior to V-A ECMO initiation and mortality was evaluated in two studies with 224 patients [OR, 2.90; 95% CI: (0.36, 23.61)] (Supplementary Figure 4). Achieving TIMI-3 flow after percutaneous coronary intervention (PCI) was reported in two studies with 361 patients. A pooled estimate of TIMI-3 flow after PCI was associated with decreased mortality [OR, 0.12; 95% CI: (0.04, 0.34)] (Supplementary Figure 5). The effect of anterior wall infarction on mortality was evaluated in four studies with 135 patients. The pooled estimate demonstrated a 1.69-fold increase in mortality in patients with anterior wall infarction [OR, 1.69; 95% CI: (1.37, 2.07)] (Supplementary Figure 6).

Arrest predictors

The effect of cardiopulmonary resuscitation (CPR) time on mortality was evaluated in three studies with 112 patients. Longer CPR duration was associated with an increase in mortality [OR, 1.85; 95% CI: (1.21, 2.83)] (Supplementary Figure 7). Time from arrest to V-A ECMO cardiopulmonary resuscitation (ECPR) time was assessed in two studies with 70 patients with a pooled effect estimate revealing a 1.63-fold increase in mortality in patients with longer time [OR, 1.63; 95% CI: (1, 2.66)] (Supplementary Figure 8).

Complications

In our study, complications including bleeding, leg ischemia, cerebral infarction, and renal failure occurred during hospitalization.

Bleeding

Bleeding was the most commonly reported complication and was reported in nine studies with 514 patients. The pooled estimate of the OR was 0.220 [95% CI: (0.166, 0.273)] in a random effects model with medium heterogeneity (I² = 51%, P = 0.04) (Figure 4).

FIGURE 4

Cerebral infarction

Seven studies with 273 patients reported cerebral infarction. The pooled estimate of the OR was 0.099 [95% CI: (0.064, 0.134)] in a common effects model with low heterogeneity (I² = 7%, P = 0.37) (Figure 5).

FIGURE 5

Leg ischemia

Nine studies with 885 patients assessed the prevalence of leg ischemia with a pooled estimate of 0.074 [95% CI: (0.057, 0.091)] and low heterogeneity among the studies (I² = 14%, p = 0.31) (Figure 6).

FIGURE 6

Renal failure

Five studies with 186 patients reported renal failure. The pooled renal failure rate was 0.494 [95% CI: (0.423, 0.565)] with low heterogeneity (I² = 5%, P = 0.38) (Figure 7).

FIGURE 7

Risk of bias assessment

The funnel plot was asymmetric when short-term mortality for patients on V-A ECMO for CS complicating STEMI was analyzed, which indicated potential publication bias. Six studies contributed to the asymmetry as they fell outside the 95% CI funnel (Figure 8).

FIGURE 8

Discussion

Patients with severe STEMI have larger myocardial infarct size, often presenting with CS, and the persistent hypoperfusion state may lead to multiple organ failure. As a short-term extracorporeal life support device, V-A ECMO has become the first-line treatment for CS because of its convenience, effectiveness, and the advantage of providing both circulation and respiratory support (23). Although there have been some retrospective studies on patients with STEMI and CS supported by V-A ECMO, large RCTs and well-recognized predictive scores are lacking for assessing patient outcomes.

The short-term mortality of STEMI and CS patients treated with V-A ECMO was estimated to be as high as 50.9% in this meta-analysis of 16 studies involving 1,162 patients. Age > 65 years, BMI > 25 kg/m², lactate > 8 mmol/L, anterior wall infarction, longer CPR time, and longer time from arrest to ECPR were independent risk predictors of mortality. Achieving TIMI-3 flow after PCI was a protective factor of mortality. The prevalence of bleeding, cerebral infarction, leg ischemia, and renal failure were 22, 9.9, 7.4, and 49.4%, respectively.

The short-term mortality rate of patients with STEMI and CS after receiving V-A ECMO was 50.9% in our study. However, the only RCT study on V-A ECMO use in myocardial infarction patients with CS showed a 30-day mortality rate of 19% in patients receiving V-A ECMO support and 33% in non-V-A ECMO-supported patients (28). The mortality rate in the RCT study was lower than in the present study, and the large difference may be explained by the fact that those who were selected for the RCT study had timely revascularization, optimal vasoactive drug administration, and were excluded from higher-risk groups (all under 80 years old, shock duration < 12 h, etc.). Data from the Extracorporeal Life Support Organization (ELSO) showed that V-A ECMO-assisted myocardial infarction patients had a survival rate of 39.5% (8), whereas the relatively high survival rate in this study may be attributed to improvements in treatment strategies and therapeutic agents in recent years. The heterogeneity remained high across studies. This may be because most of the included studies were retrospective studies with small sample sizes from different hospitals. In addition, the success proportion of PCI, and the duration of cardiac arrest may also have influenced the mortality. Therefore, high-quality RCTs are urgently needed to resolve this issue.

This meta-analysis summarizes the same predictors of mortality reported in multivariable regression models in different studies in order to provide a reference for developing new clinical prediction models. Advanced age is a common risk factor for MI, and our meta-analysis showed that age > 65 years increases short-term mortality in patients with STEMI with CS assisted by V-A ECMO. Previous studies have shown that age > 75 years is a relative contraindication to ventricular mechanical assist device implantation. When we analyzed the literature, we found that some older people can still benefit greatly from the use of V-A ECMO. Therefore, older patients with favorable prognostic factors should be carefully selected (29). Lactate serves as a valuable biomarker, and its increase correlates with the degree of tissue hypoxia. It is also a biomarker that is relatively easy to measure at the bedside due to the availability of handheld lactate meters and the satisfactory agreement between peripheral venous, central venous, and arterial lactate values (30). Lactate has been widely used to predict the prognosis of patients with different types of shock. A great many studies have shown lactate and lactate clearance are strongly associated with prognosis in patients with CS treated with V-A ECMO (31). Obesity is a well-recognized risk factor for poor prognosis and mortality in patients with cardiovascular disease, similar to the pooled results of this meta-analysis (32, 33). However, in the field of critical medicine, sometimes BMI and death are not positively correlated, which is known as the “obesity paradox,” which suggests that when patients gain weight, they have a better nutritional supply and resistance to disease (34). Previous studies have shown a significant increase in mortality in patients receiving V-A ECMO when BMI was < 18.5 kg/m² (35). Whereas, Sreenivasan et al. (36) reported that when patients with acute heart failure were assisted with V-A ECMO, there was no significant association between BMI and mortality, while patients treated with V-A ECMO for AMI had a BMI > 35 kg/m² and mortality was strongly associated. Older age, higher BMI, and higher lactate were significant predictors of mortality in different prediction models of V-A ECMO-supported AMI and CS patients (encouragement score, SAVE score, and AMI-ECMO score). Encourage score and SAVE score are the most commonly used prediction models, but they do not include angiographic data such as the location of the culprit vessel and whether or not achieving TIMI III after PCI, which are also important factors influencing the prognosis of myocardial infarction (9). AMI-ECMO score is the only risk score including angiographic data and has shown a better predictive effect than Encourage score and SAVE score, but it still needs to be confirmed by multicenter studies and more patients enrolled (8–10).

In addition to the common predictors of mortality mentioned above, this meta-analysis also found that CPR time and time from arrest to ECPR were also independent predictors of death. Prolonged CPR is associated with poor outcomes, with only a few patients able to return to their previous lives without complications. Previous studies have shown that standard CPR can provide up to 25–40% of normal cardiac output and CPR time longer than 40 min is strongly associated with poor prognosis (37). The time from arrest to ECPR may be a major determinant of a good outcome (38). When ECPR is provided rapidly, improved oxygenation to vital organs may prevent organ failure. This is particularly true for myocardial viability, as ECPR improves coronary oxygenation, which may affect the recovery of spontaneous circulation. Park et al. (39) reported that time from arrest to ECPR was significantly and inversely associated with survival to discharge for every 10 min increase in time and time from arrest to ECPR ≤ 60 min was independently associated with improved survival. Therefore, for patient prognosis, it is extremely important to shorten the time of hypoperfusion before V-A ECMO treatment and guarantee blood pressure stability after V-A ECMO implantation by optimizing the standardized CPR process and deciding early ECMO support (40). However, for STEMI patients, the implementation of V-A ECMO before PCI remains controversial. Longer D2B time is closely associated with higher mortality, even if they are treated within 90 min of admission (41). Huang et al. (24) reported that although D2B time may be prolonged, the benefits of early ECMO support may compensate for the damage. However, the result should be interpreted with caution, as no large sample studies have confirmed this, and future studies are needed to confirm this.

Venoarterial extracorporeal membrane oxygenation-assisted therapy requires a balance of benefit and risk of complications. Despite advances in material and technical improvements, bleeding and thromboembolism remain major threats to V-A ECMO therapy (42). As an invasive ventricular assist device, bleeding complications often occur during the use of V-A ECMO, due to the continuous application of anticoagulants and consumption of clotting substances in the process of diversion (43). In this study, the incidence of bleeding complications was 22.0%, suggesting that in the application of V-A ECMO, clotting function should be closely monitored, the dosage of heparin should be adjusted in time and the occurrence of bleeding complications should be detected early. Ischemic stroke occurred in 9.9% of patients during V-A ECMO-assisted therapy, and the causes of stroke were multifactorial: thrombosis, anticoagulation, hemodynamic instability, etc. Compared with patients without neurological complications, mortality was significantly higher in patients with stroke (44). With prolonged bed rest and large caliber femoral artery cannulation, patients often suffer from ischemic complications during V-A ECMO treatment. Lamb et al. (45) reported that none of the 55 patients with prophylactic distal perfusion catheters had limb ischemia, while 12 of the 36 patients without distal perfusion catheters had limb ischemia. Juo et al.’s (46) meta-analysis also reported a large benefit from the use of a distal perfusion catheter, which is therefore strongly recommended. Our meta-analysis showed that the incidence of renal failure remains as high as 49.4%. STEMI patients with CS are prone to acute renal insufficiency. Previous studies have shown that high volume load status is closely related to patient mortality, so CRRT therapy should be performed as soon as possible to reduce volume load and promote recovery (47).

There is a lack of large RCTs and well-recognized predictive scores to assess the outcomes of STEMI patients with CS requiring V-A ECMO. To overcome the shortcomings of the previous studies, our study not only identified some factors that significantly influence mortality in STEMI patients with CS treated with V-A ECMO but also further discussed the clinical application of these risk factors according to the latest clinical progress. These factors may help clinicians develop new mortality prediction models and select patients who are most likely to benefit from V-A ECMO support by balancing the benefits and risks.

Limitation

Our study has some limitations. The results from this meta-analysis must be interpreted with caution. First, most of the included studies were non-RCT studies, which increased the risk of bias. There was high heterogeneity among the included studies, but we have conducted sensitivity analysis to explore the potential sources of heterogeneity. Subgroup analyses were also attempted but no meaningful group assignments were identified. Second, we pooled together different definitions of short-term mortality, which may imply some variation in the results of different studies. Third, the number of included studies was small. Finally, this study assessed only short-term mortality and provided limited insight into long-term survival and recovery of cardiac function.

Conclusion

Our study identified Age, BMI, lactate, anterior wall infarction, TIMI-3 flow after PCI, CPR time, and time from arrest to ECPR significantly influence mortality in STEMI patients with CS requiring V-A ECMO. These factors may help clinicians to detect patients with poor prognosis earlier and develop new mortality prediction models.

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