Abstract
Aims
To perform a pairwise meta-analysis of randomized controlled trials (RCTs) comparing multivessel percutaneous coronary intervention (PCI) and culprit vessel-only PCI in ST-elevation myocardial infarction (STEMI) patients without cardiogenic shock.
Methods
We searched MEDLINE, Cochrane Central Register of Controlled Trials, and Embase for RCTs comparing multivessel PCI with culprit vessel-only PCI in STEMI patients without cardiogenic shock and multivessel coronary artery disease. Only RCTs reporting mortality or myocardial reinfarction after at least 6 months following randomization were included. Hazard ratios (HRs) were pooled using random-effect models.
Results
Nine RCTs were included in the final analysis. In total, 523 (8.3%) of 6314 patients suffered the combined primary endpoint of death or non-fatal reinfarction. This primary endpoint was significantly reduced with multivessel PCI compared to culprit vessel-only PCI (HR 0.63, 95% confidence interval [CI] 0.43–0.93; p = 0.03). This finding was driven by a reduction of non-fatal reinfarction (HR 0.64, 95% CI 0.52–0.79; p = 0.001), whereas no significant reduction of all-cause death (HR 0.77, 95% CI 0.44–1.35; p = 0.28) or cardiovascular death (HR 0.64, 95% CI 0.37–1.11; p = 0.09) was observed.
Conclusions
In STEMI patients without cardiogenic shock multivessel PCI reduced the risk of death or non-fatal reinfarction compared to culprit vessel-only PCI.
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Introduction
Approximately 50% of patients with ST-elevation myocardial infarction (STEMI) present with multivessel coronary artery disease at the time of primary percutaneous coronary intervention (PCI), which is associated with worse prognosis [1,2,3]. The optimal management of additional stenoses in non-culprit coronary arteries is still under debate. While earlier observational studies reported worse outcomes with multivessel revascularization performed during primary PCI, numerous randomized controlled trials (RCTs) conducted during the last years suggested a benefit of multivessel PCI over culprit vessel-only PCI [4,5,6,7,8,9,10]. However, in several moderately-sized trials positive results were primarily driven by a reduced rate of subsequent myocardial revascularization rather than a reduction of hard clinical events [8, 9]. Recently, the so far largest COMPLETE (The Complete versus Culprit-Only Revascularization Strategies to Treat Multivessel Disease after Early PCI for STEMI) trial reported a significant reduction of the combined endpoint of cardiovascular death and new myocardial infarction [10].
We aimed to perform a meta-analysis of RCTs comparing the efficacy of multivessel revascularization compared to culprit vessel-only PCI in STEMI patients without cardiogenic shock.
Methods
Search strategy and selection criteria
We searched MEDLINE through PubMed (up to July 22, 2019), Cochrane Central Register of Controlled Trials (up to July 22, 2019), and Embase (up to July 25, 2019) for RCTs of potential interest. Only studies published in English language were considered. Four groups of search terms were used, of which at least one term in each group was required to match: (1) "STEMI", "ST-elevation myocardial infarction", "ST-segment elevation myocardial infarction", "ST-elevation myocardial infarction", "ST-segment elevation myocardial infarction", and “ST-elevation"; (2) “multivessel”, “multi vessel”, “multi-vessel”, “complete”, and “culprit”; (3) "PCI", “PPCI", "pPCI", "primary PCI", "percutaneous coronary intervention", "primary percutaneous coronary intervention", "revascularization", “revascularization", and "angioplasty"; (4) "randomized", "randomised", "random", and "randomly" (Online Supplement Section 1). The data of the COMPLETE trial were included in our analysis immediately after online publication [10].
We included RCTs comparing culprit vessel-only PCI versus multivessel PCI in patients with STEMI and multivessel coronary artery disease, reporting mortality or non-fatal myocardial infarction after at least 6 months following randomization. Multivessel revascularization could be performed immediately during the index procedure or staged, but within 2 months following culprit vessel PCI. RCTs including STEMI patients with cardiogenic shock as well as studies with staged procedures not within the above-mentioned timeframe were excluded. We excluded also RCTs which were not published in full text since the risk of bias and other critical features cannot be excluded. The present meta-analysis was registered at the PROSPERO international prospective register of systemic reviews (CRD42019142643).
Data extraction and analysis
After removing duplicates, titles and abstracts of the identified studies were screened for eligibility by two independent observers (HJF and AF). In case of uncertainty, full-text articles were reviewed. Any discrepancies were resolved by discussion after consultation of a third investigator (AJ).
The risk of bias of the included trials was assessed by two independent investigators (HJF and AF) according to the Cochrane Collaboration’s tool for assessing risk of bias in randomized trials [11]. Again, after consultation of a third investigator (AJ), any discrepancies were resolved by discussion.
Data on sample size, length of follow-up, revascularization strategy, medical history, baseline clinical characteristics, and outcome were independently extracted by two observers (HJF and AJ). After checking for discrepancies and plausibility, individual study results were merged in a single uniformly coded data sheet.
Outcomes
The primary endpoint was a combination of death and non-fatal myocardial reinfarction. Because of diverse definition of the combined endpoint (all-cause death vs. cardiovascular death) among the included trials, we performed additional analyses exclusively including studies reporting all-cause or cardiovascular death. Secondary endpoints included all-cause death, cardiovascular death, non-fatal myocardial reinfarction, and revascularization. In stratified analyses, we investigated the heterogeneity introduced by pooling studies investigating (a) different strategies for multivessel PCI (i.e. multivessel PCI within index procedure versus multivessel PCI as staged procedure), (b) fractional flow reserve (FFR)-guided versus angiography-guided multivessel PCI, and (c) all-cause death versus cardiovascular death as part of the composite endpoint of death or non-fatal myocardial reinfarction.
Data analysis
We analyzed data by the intention-to-treat principle. Extracted hazard ratios (HRs) were converted to natural logarithms of HRs lnHR. The variance of lnHR V* was calculated using the extracted 95% confidence intervals of the HRs according to Eq. (1). In case HRs with respective 95% confidence intervals were not reported, we estimated these measures. For each treatment group i the failure rate λ was calculated using the number of events in that group eventsi, the number of patients in that group patientsi, and the mean follow-up duration in months for the total population according to formula (2). The estimated HR resulted by dividing λ of the multi-vessel group by λ of the single vessel group as shown in formula (3). For the estimated HR V* was estimated according to formula (4):
The lnHR published in the original articles showed good agreement with the estimated lnHR (Online Supplement Section 2). We, therefore, felt confident to use this approach to estimate the lnHR of studies not reporting HR in their original article. Study-level results (i.e. lnHR and V*) were pooled by means of a random-effects meta-analysis using the inverse variance method as primary analysis. Between-study variances τ2 was calculated according to Paule–Mandel with Hartung–Knapp adjustment. In addition, a fixed effect meta-analysis was calculated. Cochran’s Q statistic and Higgins and Thompsons I2 were calculated to assess heterogeneity. The presence of small-study effects was investigated visually by means of funnel plots. Since the number of included trials was below 10, we did not apply formal test of funnel plot asymmetry [12]. We evaluated interactions in stratified analyses in random-effects models combined from the final results.
Results
Trial characteristics
Our search resulted in 1751 search items including 756 duplicates. Detailed trial selection is demonstrated in Fig. 1. Screening of titles and abstracts identified 12 RCTs, of which 9 trials were included in final analysis (Fig. 1, Table 1). Two trials compared revascularization strategies not eligible for our meta-analysis and were, therefore, excluded (complete revascularization versus stress-echocardiography-guided revascularization in Calvino Santos et al. and staged-complete revascularization versus ischemia-driven revascularization in Mashhour et al.) [13, 14]. Another study (PRAGUE-13) was excluded because of missing full-text publication [15]. Definitions of study endpoints of the included trials are summarized in the Online Supplement Section 3.
Five out of 9 trials included showed a low risk of bias, whereas in 4 trials the risk of bias was substantial (Online Supplement Section 4). Additional quality indicators mirror the findings of the established risk assessment (Online Supplement Section 5). Key features of the included trials are summarized in Table 1. Baseline and treatment characteristics are shown in Table 2. With the exception of one study (Politi et al.), which compared culprit vessel-only revascularization with two different strategies of complete revascularization, patients were randomized to two different revascularization strategies in all trials (Table 1) [16]. The two groups receiving complete revascularization in the study by Politi et al. (immediate PCI of non-infarct-related arteries vs. staged PCI of non-infarct-related arteries) were combined for primary outcome analysis. The duration of follow-up ranged between 6 and 36 months among the included trials, whereas mean or median follow-up was only reported in 5 of 8 trials (Online Supplement Section 5). The other trials reported only the planned fixed follow-up duration ignoring censoring due to experiencing an endpoint event or loss to follow-up. Four trials did not report outcome data regarding the combination of death and non-fatal myocardial reinfarction and therefore could not be included in the analysis of the primary endpoint (HELP AMI, Politi et al. Ghani et al. and Hamza et al.). Six studies were included in the analyses of all-cause and cardiovascular mortality. The rate of myocardial reinfarction was reported in 8 trials.
Outcome analysis
In total, 523 (8.3%) of 6314 patients suffered the combined endpoint of death or non-fatal myocardial reinfarction. In patients treated with multivessel PCI this occurred less often than in patients treated by culprit vessel-only PCI (HR 0.63, 95% confidence interval [CI] 0.43–0.93; p = 0.03; Fig. 2a). According to stratified analysis, the reduction of the primary endpoint was not related to the mode of death reported in the individual trial (i.e. all-cause death versus cardiovascular death combined with non-fatal myocardial reinfarction; p value for between-group difference = 0.40; Fig. 2b). Looking on single endpoints, multivessel PCI did not reduce all-cause (HR 0.77, 95% CI 0.44–1.35, p = 0.28; Fig. 3a) or cardiovascular mortality (HR 0.64, 95% CI 0.37–1.11, p = 0.09; Fig. 3b) in comparison to culprit vessel-only PCI. However, the risks of non-fatal myocardial reinfarction (HR 0.64, 95% CI 0.52–0.79; p = 0.001; Fig. 3c) and repeat revascularization (HR 0.33, 95% CI 0.22–0.50, p < 0.001; Fig. 3d) were reduced with multivessel PCI compared to culprit vessel-only PCI. In a stratified analysis, the use of FFR-guided multivessel PCI (HR 0.69, 95% CI 0.08–5.83) did not affect the risk for the combined endpoint of death or non-fatal myocardial reinfarction compared to an angiography-guided strategy (HR 0.55, 95% CI 0.20–1.53; p value for between-group difference = 0.44; Fig. 4). Moreover, heterogeneity within the overall analysis was not explained by FFR versus no FFR strategy (I2 = 27% in the overall population versus I2 = 0% in FFR-guided and I2 = 59% in non-FFR-guided trials).
The benefit of multivessel PCI regarding the primary endpoint was formally greater in trials performing multivessel PCI predominantly within the index procedure as compared to trials of multivessel PCI in a staged procedure (HR 0.45, 95% CI 0.24–0.84 versus HR 0.75, 95% CI 0.55–1.02; p value for between-group difference < 0.001). This interaction was also present in the fixed effect model (p value for between-group difference = 0.03). This stratification abandoned heterogeneity (I2 = 27% in the overall population versus I2 = 0% in both strata). Visual inspection did not suggest small-study effects for any of the performed meta-analyses (Online Supplement Section 6, Figs. 2–6).
Discussion
In the present meta-analysis, multivessel revascularization by PCI was associated with a significant reduction of the combined endpoint of death and non-fatal myocardial reinfarction in STEMI patients without cardiogenic shock. This finding was driven by a reduction of non-fatal myocardial reinfarction in the multivessel PCI group, whereas the rates of all-cause and cardiovascular death were similar between groups. As expected, repeat revascularizations were also significantly reduced in patients receiving multivessel PCI. FFR-guided revascularization did not impact prognosis compared to an angiography-guided approach.
Early revascularization of the infarct-related artery is crucial to reduce myocardial damage and preserve myocardial function and the detrimental effects of treatment delay have been shown in many studies [17, 18]. Single-stage multivessel PCI in STEMI patients without cardiogenic shock was not recommended in earlier STEMI guidelines based on adverse outcome with multivessel PCI reported by observational studies [4, 19,20,21]. However, observational studies are prone for significant selection bias since patients with more severe atherosclerotic lesions in non-culprit vessels might more likely receive multivessel PCI. During the last years several RCTs were conducted, consistently showing a benefit with multivessel PCI [6,7,8,9]. These findings were substantially driven by a reduction of subsequent revascularizations in most of these trials [8, 9].
The recently published COMPLETE trial reported a reduction of the combined endpoint of cardiovascular death or non-fatal myocardial infarction [10]. Since COMPLETE is the by far largest trial in the field, the results of the present meta-analysis are substantially driven by this trial. Even though COMPLETE’s weight is higher in fixed effect meta-analyses as compared to random-effects meta-analyses, visual inspection of funnel plots did not indicate asymmetry and hence small-study effects.
Another recently published meta-analysis which also included the data of the COMPLETE trial showed, in contrast to our meta-analysis, a significant reduction of cardiovascular mortality with complete revascularization [22]. This discrepancy results from different statistical approaches. We pre-specified in our PROSPERO registration (CRD42019142643) that we will estimate the between-study variance according to Paule–Mandel with Hartung–Knapp adjustment. The above-mentioned meta-analysis by Pavasini et al. used the DerSimonian–Laird estimator without Hartung–Knapp adjustment for estimating the between-study variance in their random-effects meta-analysis. It is well known that the DerSimonian–Laird estimator is prone to produce false positive findings especially in case when the number of pooled trials is small. The findings reported by Pavasini et al. should therefore be interpreted with caution. In line with our findings, the by far largest and well powered COMPLETE trial did not show any difference in cardiovascular mortality.
The COMPLETE trial as well as the present meta-analysis demonstrate that the benefits of multivessel PCI are attributed to a reduction of myocardial reinfarction. COMPLETE indicates that multivessel PCI after STEMI can prevent future coronary events, irrespective of the presence of objective or subjective signs of myocardial ischemia. One might speculate, how far these findings will impact future recommendations regarding multivessel PCI in STEMI patients.
The finding that multivessel PCI is more beneficial when performed within the index procedure should be interpreted with caution [23,24,25]. Perhaps, detection bias could serve as an explanation, as periprocedural infarctions might be less frequently diagnosed in patients receiving immediate multivessel PCI, since new troponin elevations or ECG changes might be incorrectly attributed to the index infarction. Importantly, periprocedural infarction was not well defined in several included trials (Online Supplement Section 3). Better outcome with immediate multivessel PCI might be explained by a higher 30-day mortality in STEMI patients with additional stenoses in non-culprit coronary arteries compared to those without additional stenoses [1]. On the other hand, the number of patients randomized during off hours is unclear from the trial reports. It might be possible that multivessel PCI is only beneficial during routine practice when maximal technical support and infrastructure is available [26]. Otherwise, multivessel PCI during off hours could be even harmful in some cases. This consideration might have influenced the COMPLETE study protocol, now leading to the situation that data for staged multivessel PCI is most robust.
The use of FFR-guided multivessel PCI was not associated with the risk for death or reinfarction compared to an angiography-guided approach. According to two RCTs, FFR-guided multivessel PCI could neither reduce mortality nor the rate of reinfarctions [8, 9]. In our meta-analysis comparison of FFR- and angiography-guided multivessel PCI is hampered by the diverse definition of FFR- and diameter stenosis-thresholds among the included trials (Table 1). However, the limited number of included trials hampers separate outcome analysis for different cut-off values from a statistical point of view.
The risk of bias was substantial in four trials, which all comprised a lower number of included patients compared to the five trials with a low risk of bias [6,7,8,9, 16, 27,28,29]. Nevertheless, we could not detect any substantial small-study effects by visual estimation.
Limitations
In contrast to most previous meta-analyses, our meta-analysis took differences in length of follow-up in consideration. However, it is only based on published aggregated data. Unfortunately, not all eligible trials reported HRs with respective 95% CI. We therefore had to estimate these measures. Our approach is mathematically very similar to the approach used by Bangalore et al. [23]. Since the weight of the trials with estimated HRs is rather low, the error introduced in our pooled estimate is most likely small. We did not include the trial of Politi et al. in our meta-analysis regarding death or non-fatal myocardial reinfarction. This endpoint was not reported and we believe that summing up event rates for death and non-fatal myocardial reinfarction should not be done. Such an approach is prone to error if the same patients had a non-fatal myocardial reinfarction event before they die. To assure a detailed risk of bias assessment, only trials with available full-text publication were included in our meta-analysis. Therefore, PRAGUE-13 was not considered [15]. However, PRAGUE-13 would account for only 3% of patients in our meta-analysis.
Conclusion
Multivessel PCI in STEMI patients without cardiogenic shock significantly reduced the risk of death or non-fatal myocardial reinfarction compared to culprit vessel-only PCI. This finding was mainly driven by a reduced rate of reinfarction. FFR-guided multivessel PCI resulted in similar outcome compared to an angiography-guided approach.
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Feistritzer, HJ., Jobs, A., de Waha-Thiele, S. et al. Multivessel versus culprit-only PCI in STEMI patients with multivessel disease: meta-analysis of randomized controlled trials. Clin Res Cardiol 109, 1381–1391 (2020). https://doi.org/10.1007/s00392-020-01637-6
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DOI: https://doi.org/10.1007/s00392-020-01637-6