BioMed Research International
Volume 2018 (2018), Article ID 7563083, 10 pages
https://doi.org/10.1155/2018/7563083

Review Article

Levosimendan in Patients with Left Ventricular Dysfunction Undergoing Cardiac Surgery: An Update Meta-Analysis and Trial Sequential Analysis

Benji Wang,¹ Xiaojie He,² Yuqiang Gong,¹ and Bihuan Cheng¹

¹Department of Anesthesiology, Critical Care and Pain Medicine, The Second Affiliated Hospital and Yuying Children’s Hospital of Wenzhou Medical University, Wenzhou, Zhejiang 325000, China
²School of Ophthalmology and Optometry and Eye Hospital, Wenzhou Medical University, Wenzhou, Zhejiang 325000, China

Correspondence should be addressed to Bihuan Cheng; cbh@wmu.edu.cn

Received 3 January 2018; Revised 19 March 2018; Accepted 28 March 2018; Published 8 May 2018

Academic Editor: Gianluca Pontone

Copyright © 2018 Benji Wang et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract.

Background. Recent studies suggest that levosimendan does not provide mortality benefit in patients with low cardiac output syndrome undergoing cardiac surgery. These results conflict with previous findings. The aim of the current study is to assess whether levosimendan reduces postoperative mortality in patients with impaired left ventricular function (mean EF ≤ 40%) undergoing cardiac surgery. Methods. We conducted a comprehensive search of PubMed, EMBASE, and Cochrane Library Database through November 20, 2017. Inclusion criteria were random allocation to treatment with at least one group receiving levosimendan and another group receiving placebo or other treatments and cardiac surgery patients with a left ventricular ejection fraction of 40% or less. The primary endpoint was postoperative mortality. Secondary outcomes were cardiac index, pulmonary capillary wedge pressure (PCWP), length of intensive care unit (ICU) stay, postoperative atrial fibrillation, and postoperative renal replacement therapy. We performed trial sequential analysis (TSA) to evaluate the reliability of the primary endpoint. Results. Data from 2,152 patients in 15 randomized clinical trials were analyzed. Pooled results demonstrated a reduction in postoperative mortality in the levosimendan group [RR = 0.53, 95% CI (0.38–0.73), ]. However, the result of TSA showed that the conclusion may be a false positive. Secondary outcomes demonstrated that PCWP, postoperative renal replacement therapy, and length of ICU stay were significantly reduced. Cardiac index was greater in the levosimendan group. No difference was found in the rate of postoperative atrial fibrillation. Conclusions. Levosimendan reduces the rate of death and other adverse outcomes in patients with low ejection fraction who were undergoing cardiac surgery, but results remain inconclusive. More large-volume randomized clinical trials (RCTs) are warranted.

1. Introduction

Cardiac surgery is a common operation, with more than 1 million procedures performed annually in the United States and Europe [1]. Though medical treatment and surgical techniques continue to improve, the management of patients undergoing cardiac surgery remains challenging. Postoperative risk of mortality remains high, especially in patients with postoperative low cardiac output syndrome. Preoperative left ventricular dysfunction is an independent risk factor for mortality and is also associated with postoperative low cardiac output syndrome [2]. This syndrome increases the risk of complications including the need for dialysis, stroke, and mechanical circulatory support [3–5]. Inotropic agents are used as first-line treatment to treat this syndrome. Unfortunately, most inotropic agents either give adverse reactions or impose unknown safety hazards [6]. Hence, new drugs with fewer deleterious effects are being sought.

Levosimendan is a calcium-sensitizing drug that increases cardiac contractility with vasodilatory properties [7] and does not impair diastolic relaxation [8]. And other therapeutic effects of levosimendan include reduction of oxidative burst activity of polymorphonuclear leucocytes (PMNs), immunomodulation, and antiapoptotic properties [9]. Several epidemiological studies suggest that levosimendan prevents low cardiac output syndrome and reduces postoperative mortality [10–13]. Therefore, in several countries, the drug was approved for the prevention and treatment of the low cardiac output syndrome following cardiac surgery [14–17]. However, recent large randomized clinical trials [18, 19] showed no survival benefit from levosimendan in patients with left ventricular dysfunction undergoing cardiac surgery.

Therefore, we systematically searched and analyzed randomized clinical trials (RCTs) to evaluate the effects of levosimendan in patients with left ventricular dysfunction undergoing cardiac surgery.

2. Methods

2.1. Literature Search Strategy

This systematic review and meta-analysis was performed following Preferred Reporting Items for Systematic reviews and Meta-Analysis guidelines [20]. Relevant studies investigating the perioperative use of levosimendan in patients undergoing cardiac surgery were independently searched in PubMed, EMBASE, and Cochrane Library Database and were last updated on November 20, 2017. There were no restrictions regarding languages, regions, or publication types. The search terms included “levosimendan”, “levosimedan”, “cardiac surgery”, “heart surgery”, and “randomized clinical trial”. The search strategy is shown in the Appendix. Additional eligible studies were identified by examination of the reference lists of the obtained publications and relevant reviews.

2.2. Study Selection

Two authors (Benji Wang and Xiaojie He) independently reviewed the titles, abstracts, or both and summarized the data from the selected articles. Any discrepancies in extracted data were resolved by the senior author (Bihuan Cheng). Studies were considered eligible for analysis if (1) patients were undergoing cardiac surgery with left ventricular dysfunction (left ventricular ejection fraction (EF) ⩽ 40%) [3], (2) the intervention was levosimendan, (3) the outcome of interest was mortality, including in-hospital or 30-day mortality, and (4) the study design was an RCT (i.e., not conference abstracts, case report, or review). Exclusion criteria were nonhuman experimental studies, pediatric studies, duplicate publications, and lack of mortality data.

2.3. Data Extraction

The following information was extracted: authors, year of publication, mean age of participants, number of participants, diagnostic criteria, preoperative mean EF, control treatment, levosimendan dose, and length of treatment (Table 1). Postoperative mortality was the primary endpoint. 30-day mortality was the first choice. If both in-hospital and 30-day outcomes were reported, the latter was used for analysis. The secondary endpoints were cardiac index, PCWP, length of ICU stay, postoperative atrial fibrillation, and postoperative renal replacement therapy.

Table 1: The main characteristics of included studies.

Study: first author
Year
Mean age of participants
Levosimendan/control (years)
Number of participants
Setting
Preoperative mean EF (%)
Control
Levosimendan Infusion
Dose (μg/kg/min)

Levosimendan/control
Levosimendan
Control

Al-Shawaf et al.
2006
60.5/58
14/16
Elective CABG surgery, EF ≤ 35%
29 ± 6
31 ± 6
Milrinone
Bolus: 12 μg/kg

Inf: 0.1–0.2 μg/kg/min

Duration: 24 h

De hert et al.
2007
67/69
15/15
Elective cardiac surgery with CPB, EF ≤ 30%
24 ± 6
27 ± 3
Milrinone
Bolus: none

Inf: 0.1 μg/kg/min

Duration: NR

Levin et al.
2008
62.4/61.7
69/68
Coronary surgery with ECC and manifest LCOS
36.62 ± 4.36
38.22 ± 5.24
Dobutamine
Bolus: 10 μg/kg

Inf: 0.1 μg/kg/min

Duration: 24 h

Eriksson et al.
2009
64/64
30/30
CABG with CPB and EF < 50% or acute CHF
36 ± 8
36 ± 8
Placebo
Bolus: 12 μg/kg

Inf: 0.2 μg/kg/min

Duration: 24 h

Severi et al.
2011
66/60
11/11
CABG with or without concomitant mitral surgery, EF < 50%
26 ± 6.2
30 ± 6.4
IABP
Bolus: none

Inf: 0.1 μg/kg/min

Duration: 24 h

Lomivorotov et al.
2012
57.3/56.8
30/30
CABG with CPB, EF < 35%
31 (28–33)
30 (29–33)
IABP
Bolus: 12 μg/kg

Inf: 0.1 μg/kg/min

Duration: 24 h

Levin et al.
2012
63.7/62.9
127/125
Cardiac surgery with CPB, EF < 25%
17.56 ± 3.24
18.62 ± 2.12
Placebo
Bolus: 10 μg/kg

Inf: 0.1 μg/kg/min

Duration: 24 h

Sharma et al.
2014
53.95/54.55
20/20
CABG and mitral valve repair, EF < 25%
23.55 ± 4.87
22.55 ± 0.92
Placebo
Bolus: none

Inf: 200 μg/kg

Duration: 24 h

Baysal et al.
2014
56.73/58.41
64/64
Mitral valve surgery, EF ≤ 45%
35.0 (20–50)
37.5 (25–50)
Standard inotropic agents
Bolus: 6 μg/kg

Inf: 0.1 μg/kg/min

Duration: 24 h

Erb et al.
2014
69.5/63.4
17/16
Elective CABG with or without valve surgery, EF ≤ 35%
22.0 ± 4.5
22.4 ± 5.5
Placebo
Bolus: none

Inf: 0.1 μg/kg/min

Duration: NR

Knezevic et al.
2014
53/49
47/47
Heart transplantation and advanced heart failure
20 ± 6
21 ± 7
Standard inotropic or vasopressor
Bolus: none

Inf: 0.1 μg/kg/min

Duration: NR

Shah et al.
2014
59.91/61.32
25/25
OPCABG, EF < 30%
22.45 ± 4.06
22.56 ± 3.41
Placebo
Bolus: none

Inf: 0.13 μg/kg/min

Duration: 24 h

Anastasiadis et al.
2016
61.1/62.2
16/16
CABG, EF ≤ 40%
35.7 ± 4.9
37.5 ± 3.4
Placebo
Bolus: none

Inf: 0.1 μg/kg/min

Duration: 24 h

Mehta et al.
2017
65/65
428/421
Cardiac surgery with CPB, EF ≤ 35%
26 (24–32)
27 (22–31)
Placebo
Bolus: 0.2 μg/kg/min

Inf: 0.1 μg/kg/min

Duration: 24 h

Cholley et al.
2017
69/67
167/168
CABG with CPB or combined with valve surgery, EF ≤ 40
≤40
≤40
Placebo
Bolus: none

Inf: 0.1 μg/kg/min

Duration: 24 h

CABG: coronary aortic bypass grafting; OPCABG: off-pump coronary aortic bypass grafting; CBP: cardiopulmonary bypass; EF: ejection fraction; ECC: extracorporeal circulation; LCOS: low cardiac output syndrome; CHF: congestive heart failure; IABP: intra-aortic balloon pump.

2.4. Quality Assessment

Procedural and main outcomes were independently screened by two reviewers (Benji Wang and Xiaojie He), with divergences resolved by consensus. If consensus could not be reached, we consulted a third reviewer (Yuqiang Gong). Methodological quality evaluation was assessed according to the Cochrane Collaboration methods, judging risk of selection bias, performance bias, detection bias, attrition bias, and selective outcome reporting bias. We classified sources of bias as low, high, or unclear to indicate whether adequate measures were taken to protect against each potential source of bias [21].

2.5. Statistical Analysis

Binary outcomes in each study were expressed as relative risk (RR) with pertinent 95% confidence intervals (CIs). Weighted mean differences (WMDs) and 95% CIs were calculated for continuous variables. Studies that had no deaths in either group, that is, with no difference in the mortality rates, were discarded in the meta-analysis. Statistical heterogeneity was evaluated using Cochrane tests and . In general, , where is the chi-squared statistic and df is the degrees of freedom, ranging from 0 to 100%. suggested significant heterogeneity. The fixed-effects model was used if no substantial heterogeneity was observed; otherwise, the random-effects model was used. [22]. Publication bias was evaluated by inspection of the funnel plot. Analyses were performed with Review Manager 5.3 (Cochrane Collaboration, Oxford, UK). All statistical tests were 2-sided and was considered to be significant [23].

When data were too sparse, we needed to judge the authenticity and reliability of the conclusions [24, 25]. TSA was similar to interim analyses in a single trial in which sequential monitoring boundaries were used [26, 27]. We conducted TSA assuming a 9% control event rate, 20% relative risk reduction, 90% power, and a two-sided 0.05 to determine the reliability of the primary endpoint [28, 29]. The sample size (optimal information size) was calculated. TSA software was from the Copenhagen Trial Unit (http://www.ctu.dk/tsa/).

3. Results

3.1. Literature Search

According to the search strategy (Appendix), a total of 700 related studies were retrieved. After removing duplicate studies and excluding irrelevant titles or abstracts, 35 articles remained. After detailed examination, 15 RCTs (2,152 participants) were included in the final analysis [10, 11, 15–19, 30–37]. The flow chart summarizing the process of study selection is shown in Figure 1.

Figure 1: PRISMA flow diagram for trial selection.

3.2. Study Characteristics

The principal features of the included studies are displayed in Table 1. Publication years range from 2006 to 2017. The surgical procedures included elective cardiac surgery with cardiopulmonary bypass (CPB) [10, 18, 36], elective coronary aortic bypass grafting (CABG) surgery [15, 17, 19, 30–34, 37], coronary surgery with extracorporeal circulation (ECC) [35], valve surgery [11, 31, 33], and heart transplantation [16]. All enrolled patients had a preoperative mean EF ⩽40%. Milrinone, dopamine, placebo, intra-aortic balloon pump (IABP), and standard inotropic agents were considered the control groups for comparison with levosimendan. We used the RCT quality evaluation standard described in the Cochrane Review Handbook. The assessments of the quality and risk of bias for each of the included studies are shown in Figures 2 and 3.

Figure 2: Methodological quality graph: review authors’ judgements about each risk of bias item presented as percentages across all included studies.

Figure 3: Methodological quality summary: review authors’ judgements about each risk of bias item for each included study.

3.3. Quantitative Data Synthesis Analysis

For the primary endpoint, the pooled results from the fixed-effects model combining the risk ratio showed a significant reduction in the risk of death with levosimendan (Figure 4): 50 of 1080 patients in the levosimendan group and 96 of 1072 patients in the control group [RR = 0.53, 95% CI (0.38–0.73), for heterogeneity = 0.67, ].

Figure 4: Forest plot for the effect of levosimendan on postoperative mortality.

Seven studies [11, 15, 17, 30, 32, 35, 37] reported cardiac index, which was significantly lower in the levosimendan group [RR = 0.66, 95% CI: (0.62, 0.70), for effect < 0.00001]. There was also a significant reduction in PCWP [15, 30, 32–35, 37] [RR = −2.35, 95% CI: (−2.78, −1.93), for effect < 0.00001], length of ICU stay [11, 17–19, 30–33, 36, 37] [RR = −0.48, 95% CI: (−0.72, −0.24), for effect < 0.0001], and postoperative renal replacement therapy [10, 11, 15, 17, 18, 31, 32, 35] [RR = 0.51, 95% CI: (0.33, 0.77), for effect = 0.002] in the levosimendan group. In addition, there was no difference in postoperative atrial fibrillation [10, 11, 15, 18, 19, 30–33, 35, 36] (RR = 0.97 [95% CI: 0.85, 1.09], for effect = 0.60) (Table 2).

Table 2: Secondary endpoints after randomizations.

Secondary outcomes
Number of studies
95% CI
(heterogeneity)
(%)
(overall effect)

Cardiac index (L/min/m2)
7
0.66 [0.62, 0.70]
<0.00001
89
<0.00001

Pulmonary capillary wedge pressure (mmHg)
7
−2.35 [−2.78, −1.93]
0.001
73
<0.00001

Postoperative atrial fibrillation
11
0.97 [0.85, 1.09]
0.0006
68
0.60

Postoperative renal replacement therapy
8
0.51 [0.33, 0.77]
0.86
0
0.002

Length of ICU stay (days)
10
−0.48 [−0.72, −0.24]
<0.00001
85
<0.0001

We conducted subgroup analyses by administration of levosimendan and by type of cardiac surgery (Table 3). Seven studies [10, 11, 18, 32, 34, 35, 37] taking bolus and 24-hour prolonged infusion of levosimendan suggested that there was a significant reduction in the risk of postoperative mortality in the levosimendan group (RR = 0.48 [95% CI: 0.32, 0.73], for effect = 0.0004). Lacking the bolus or unclear duration did not suggest apparent difference. The subgroup analysis by type of cardiac surgery suggested that both coronary surgery and other surgical types in this analysis could lower the mortality in the levosimendan group (RR = 0.56 [95% CI: 0.35, 0.90], for effect = 0.02 and RR = 0.50 [95% CI: 0.32, 0.78], for effect = 0.002).

Table 3: Stratified analyses of levosimendan administration and surgical type.

Group
Number of studies
95% CI
(heterogeneity)
(%)
(overall effect)

Timing and dose of infusion of levosimendan

    Bolus + 24-hour prolonged infusion
7
0.48 [0.32, 0.73]
0.62
0
0.0004

    No bolus + 24-hour prolonged infusion
5
0.79 [0.41, 1.53]
0.43
0
0.49

    No bolus + unclear duration
3
0.35 [0.13, 1.00]
0.72
0
0.05

Type of cardiac surgery

    Coronary surgery
10
0.56 [0.35, 0.90]
0.58
0
0.02

    Other cardiac surgeries
5
0.50 [0.32, 0.78]
0.47
0
0.002

3.4. Risk of Bias and Sensitivity Analysis

The funnel plot did not show substantial asymmetry with respect to estimate distribution. This suggests no small study bias regarding postoperative mortality (Figure 5). Sensitivity analyses were conducted to investigate the influence of single trials on overall risk estimates. The results did not substantially change following removal of any single study: 0.45 (95% CI: 0.31–0.64)–0.57 (95% CI: 0.40–0.81) for risk of postoperative mortality. This suggests that our results are statistically reliable.

Figure 5: Funnel plot for the risk of levosimendan on postoperative mortality.

3.5. Reliability Analysis of the Primary Endpoint

We conducted TSA to determine the reliability of the primary outcome (Figure 6). TSA of levosimendan compared with control treatment indicated that the optimal information size needed to reliably detect a plausible effect was 12,876 patients. However, only 2,152 patients had so far been collected, far below optimal information size. The cumulative -curve of all trials crossed the traditional boundary but did not cross the trial sequential monitoring boundary. These results suggest that the evidence may be false positive and unreliable.

Figure 6: Trial sequential analysis of postoperative mortality on levosimendan compared with any control for low cardiac output syndrome in patients undergoing cardiac surgery.

4. Discussion

Our findings demonstrated that levosimendan treatment was associated with lower postoperative mortality compared with control treatment in patients with left ventricular dysfunction undergoing cardiac surgery. There was no clear evidence of between-trial heterogeneity. However, TSA suggested that the cumulative evidence might be false positive and unreliable. Additional trials are needed to confirm these conclusions. There was also a significant reduction in the rate of cardiac index, PCWP, length of ICU stay, and postoperative renal replacement therapy in the levosimendan group. No significant difference was observed in the incidence of postoperative atrial fibrillation. In addition, one approach of applying bolus and 24-hour prolonged infusion of levosimendan suggested that there was a significant reduction in the risk of postoperative mortality in the levosimendan group. These indicated that different dose and the duration of the infusion may lead to a different outcome. Furthermore, both coronary surgery and other surgical types could reduce the mortality in this analysis.

Previous meta-analyses [12, 13, 38, 39] showed a mortality benefit with levosimendan compared with other treatments in patients undergoing cardiac surgery. One of these meta-analyses demonstrated that levosimendan was associated with a greater effect among patients who had lower preoperative left ventricular systolic function compared with higher preoperative left ventricular systolic function [12]. These studies indicated that levosimendan played an important role in the treatment of postoperative low cardiac output syndrome, in high-risk patients undergoing cardiac surgery. However, two recent large trials [18, 19] showed inconsistent conclusions that levosimendan was not effective in reducing the incidence of postoperative mortality. Therefore, the aim of this study was to assess whether levosimendan infusion in patients with impaired left ventricular function (mean EF ⩽ 40%) who were undergoing cardiac surgery could reduce the postoperative mortality. Pooled evidence demonstrated that levosimendan was still associated with an increase in postoperative mortality. Moreover, the effects of levosimendan occur with decreasing postoperative PCWP, postoperative renal replacement therapy, length of ICU stay, and increasing cardiac index in analysis of secondary outcomes. These indicated that levosimendan was a treatment for postoperative low cardiac output syndrome (LCOS), in high-risk patients undergoing cardiac surgery.

Levosimendan has multiple potential mechanisms of action that may augment cardiac output with little increase in myocardial oxygen consumption [8]. Thus, levosimendan appears to be the ideal inotropic agent to support heart function in such patients [40]. One recent large trial [18] showed that levosimendan did not result in lower mortality compared with placebo, but it might help prevent LCOS and use of secondary inotrope. These data suggest that prophylactic levosimendan may have the potential to prolong survival among patients at risk for undergoing cardiac surgery.

We conducted the TSA to determine the reliability of the primary endpoint. Unfortunately, the result of TSA showed that the conclusion may be false positive and unreliable. Similarly, there was a significant reduction in the rate of postoperative atrial fibrillation with levosimendan in the previous meta-analysis [12]. However, updating the data and increasing the sample size, we saw no difference in postoperative atrial fibrillation. This explained that the conclusion was unreliable. Thus, an adequately powered trial assessing mortality reduction by levosimendan is needed. In addition, levosimendan is very expensive; formal recommendation of levosimendan requires evidence from cost-effectiveness studies [41].

The major advantage of this study was that we performed a rigorous screening of the literature and found high-quality literature. Mortality as a primary outcome is an important clinical outcome in critically ill patients. Furthermore, we conducted the TSA to assess the reliability and conclusiveness of the primary endpoint.

This study has some limitations. First, the sample of most studies in this analysis was small. Second, we included patients with preoperative mean EF ≤ 40%. However, the differences in EF of these studies were significant. The lowest mean EF was 17.56% [10]. This suggested that the severity of illness varied greatly and its prognosis also differed greatly [42]. Third, the dose and timing of levosimendan varied among trials. Some trials administered a loading dose, and we could not determine whether or not this variation affected results. Finally, the follow-up length of postoperative mortality varied; generally, 30-day mortality was the first choice. Several studies that only reported in-hospital mortality were included in this meta-analysis, possibly influencing the summary results.

5. Conclusions

In conclusion, levosimendan reduced the rate of death and other adverse outcomes in patients with low ejection fraction who were undergoing cardiac surgery. However, this result remains inconclusive, and more large-volume RCTs are warranted.

Appendix

Searching Strategy

PubMed. Search (((((((((((((((Procedures, Cardiac Surgical[Title/Abstract]) OR Surgical Procedure, Cardiac[Title/Abstract]) OR Surgical Procedures, Cardiac[Title/Abstract]) OR Surgical Procedures, Heart[Title/Abstract]) OR Cardiac Surgical Procedure[Title/Abstract]) OR Heart Surgical Procedures[Title/Abstract]) OR Procedure, Heart Surgical[Title/Abstract]) OR Procedures, Heart Surgical[Title/Abstract]) OR Surgical Procedure, Heart[Title/Abstract]) OR Heart Surgical Procedure[Title/Abstract])) OR Procedure, Cardiac Surgical[Title/Abstract]) OR “Cardiac Surgical Procedures”[Mesh])) AND (((((((“simendan” [Supplementary Concept]) OR levosimendan[Title/Abstract]) OR levosimedan[Title/Abstract]) OR or 1259[Title/Abstract]) OR “or 1259”[Title/Abstract]) OR cardiotonic agent[Title/Abstract]) OR [Title/Abstract])) AND [tw].

Embase

 #20#17 AND #18 AND #19 #19#8 OR #9 OR #10 OR #11 OR #12 OR #13 OR #14 OR #15 OR #16 #18#1 OR #2 OR #3 OR #4 OR #5 OR #6 OR #7 #17:ab,ti #16‘cardiac surgery’:ab,ti #15‘surgical procedure, cardiac’:ab,ti #14‘surgical procedures, cardiac’:ab,ti #13‘surgical procedures, heart’:ab,ti #12‘cardiac surgical procedure’:ab,ti #11‘heart surgical procedures’:ab,ti #10‘surgical procedure, heart’:ab,ti #9‘heart surgical procedure’:ab,ti #8‘heart surgery’/exp #7:ab,ti #6‘cardiotonic agent’:ab,ti #5simdax:ab,ti #4‘or 1259’:ab,ti #3levosimedan:ab,ti #2levosimendan:ab,ti #1‘levosimendan’/exp

Cochrane

 #1MeSH descriptor: [Thoracic Surgery] explode all trees #2CARDIAC SURGICAL PROCEDURES explode all trees (MeSH) #3 ((coronary next artery next bypass next surgery) or (coronary next artery next surgery) or (coronary next bypass next graft next surgery) or (coronary next artery next bypass next graft) or (coronary next bypass next graft) or (coronary next artery next bypass next ) or (coronary next bypass next ) or cabg or (((off next pump) or offpump or off-pump) and (coronary next surgery)) or (open next heart next surgery) or (heart next surgery) or (heart next valve next surgery) or (cardiopulmonary next bypass)) #4CARDIOPULMONARY BYPASS explode all trees (MeSH) #5levosimendan or levosimedan or or1259 or “or 1259” or simdax #6(inotropic near/2 ( or or or )) #7 #8(calcium near/2 ) #9MeSH descriptor: [Cardiotonic Agents] this term only #10#1 or #2 or #3 or #4 #11#5 or #6 or #7 or #8 or #9 #12#10 and #11

Conflicts of Interest

The authors declare that they have no conflicts of interest regarding the publication of this paper.

Authors’ Contributions

Benji Wang and Bihuan Cheng designed the experiment. Benji Wang and Xiaojie He extracted data. Xiaojie He and Yuqiang Gong performed all statistical analyses. Benji Wang and Bihuan Cheng drafted the paper. All authors reviewed and approved the final manuscript.

Acknowledgments

This project was supported by the Natural Science Foundation of Zhejiang Province of China (no. LY14H150011).

References

WG. Members, D. Mozaffarian, and E. J. Benjamin, “Heart disease and stroke statistics-2016 update: a report from the american heart association,” Circulation, vol. 133, no. 4, p. e38, 2016.

K. D. Algarni, M. Maganti, and T. M. Yau, “Predictors of low cardiac output syndrome after isolated coronary artery bypass surgery: Trends over 20 years,” The Annals of Thoracic Surgery, vol. 92, no. 5, pp. 1678–1684, 2011.

V. K. Topkara, F. H. Cheema, S. Kesavaramanujam et al., “Coronary artery bypass grafting in patients with low ejection fraction,” Circulation, vol. 112, no. 9, pp. I344–I350, 2005.

F. Filsoufi, P. B. Rahmanian, J. G. Castillo, J. Chikwe, A. S. Kini, and D. H. Adams, “Results and predictors of early and late outcome of coronary artery bypass grafting in patients with severely depressed left ventricular function,” The Annals of Thoracic Surgery, vol. 84, no. 3, pp. 808–816, 2007.

G. Landoni, T. Bove, M. Crivellari et al., “Acute renal failure after isolated CABG surgery: Six years of experience,” Minerva Anestesiologica, vol. 73, no. 11, pp. 559–565, 2007.

S. Thackray, J. Easthaugh, N. Freemantle, and J. G. F. Cleland, “The effectiveness and relative effectiveness of intravenous inotropic drugs acting through the adrenergic pathway in patients with heart failure - A meta-regression analysis,” European Journal of Heart Failure, vol. 4, no. 4, pp. 515–529, 2002.

Z. Papp, K. Csapó, P. Pollesello, H. Haikala, and I. Édes, “Pharmacological mechanisms contributing to the clinical efficacy of levosimendan,” Cardiovascular Drug Reviews, vol. 23, no. 1, pp. 71–98, 2005.

H. Ukkonen, M. Saraste, J. Akkila et al., “Myocardial efficiency during calcium sensitization with levosimendan: A noninvasive study with positron emission tomography and echocardiography in healthy volunteers,” Clinical Pharmacology & Therapeutics, vol. 61, no. 5, pp. 596–607, 1997.

J. Hasslacher, K. Bijuklic, C. Bertocchi et al., “Levosimendan inhibits release of reactive oxygen species in polymorphonuclear leukocytes in vitro and in patients with acute heart failure and septic shock: A prospective observational study,” Critical Care, vol. 15, no. 4, article no. R166, 2011.

R. Levin, M. Degrange, C. Del Mazo, E. Tanus, and R. Porcile, “Preoperative levosimendan decreases mortality and the development of low cardiac output in high-risk patients with severe left ventricular dysfunction undergoing coronary artery bypass grafting with cardiopulmonary bypass,” Experimental & Clinical Cardiology, vol. 17, no. 3, pp. 125–130, 2012.

A. Baysal, M. Yanartas, M. Dogukan, N. Gundogus, T. Kocak, and C. Koksal, “Levosimendan improves renal outcome in cardiac surgery: A randomized trial,” Journal of Cardiothoracic and Vascular Anesthesia, vol. 28, no. 3, pp. 586–594, 2014.

R. W. Harrison, V. Hasselblad, R. H. Mehta, R. Levin, R. A. Harrington, and J. H. Alexander, “Effect of levosimendan on survival and adverse events after cardiac surgery: A meta-analysis,” Journal of Cardiothoracic and Vascular Anesthesia, vol. 27, no. 6, pp. 1224–1232, 2013.

G. Landoni, A. Mizzi, G. Biondi-Zoccai et al., “Reducing mortality in cardiac surgery with levosimendan: a meta-analysis of randomized controlled trials,” Journal of Cardiothoracic and Vascular Anesthesia, vol. 24, no. 1, pp. 51–57, 2010.

W. Toller, M. Heringlake, F. Guarracino et al., “Preoperative and perioperative use of levosimendan in cardiac surgery: European expert opinion,” International Journal of Cardiology, vol. 184, no. 1, pp. 323–336, 2015.

B. Shah, P. Sharma, A. Brahmbhatt et al., “Study of levosimendan during off-pump coronary artery bypass grafting in patients with LV dysfunction: A double-blind randomized study,” Indian Journal of Pharmacology, vol. 46, no. 1, pp. 29–34, 2014.

I. Knezevic, G. Poglajen, E. Hrovat et al., “The effects of levosimendan on renal function early after heart transplantation: results from a pilot randomized trial,” Clinical Transplantation, vol. 28, no. 10, pp. 1105–1111, 2014.

J. Erb, T. Beutlhauser, A. Feldheiser et al., “Influence of levosimendan on organ dysfunction in patients with severely reduced left ventricular function undergoing cardiac surgery,” Journal of International Medical Research, vol. 42, no. 3, pp. 750–764, 2014.

R. H. Mehta, J. D. Leimberger, and S. van Diepen, “Levosimendan in patients with left ventricular dysfunction undergoing cardiac surgery,” The New England Journal of Medicine, vol. 376, no. 21, pp. 2032–2042, 2017.

B. Cholley, T. Caruba, S. Grosjean et al., “Effect of levosimendan on low cardiac output syndrome in patients with low ejection fraction undergoing coronary artery bypass grafting with cardiopulmonary bypass - The LICORN randomized clinical trial,” Journal of the American Medical Association, vol. 318, no. 6, pp. 548–556, 2017.

D. Moher, A. Liberati, J. Tetzlaff, and D. G. Altman, “Preferred reporting items for systematic reviews and meta-analyses: the PRISMA statement,” Revista Española De Nutrición Humana Y Dietética, vol. 3, no. 3, p. e123, 2009.

B. Wang, R. Chen, X. Guo et al., “Effects of levosimendan on mortality in patients with septic shock: Systematic review with meta-analysis and trial sequential analysis,” Oncotarget , vol. 8, no. 59, pp. 100524–100532, 2017.

R. Dersimonian and N. Laird, “Meta-analysis in clinical trials revisited,” Contemporary Clinical Trials, vol. 45, pp. 139–145, 2015.

J. Wang, Y. Xue, S. Thapa, L. Wang, J. Tang, and K. Ji, “Relation between age-related macular degeneration and cardiovascular events and mortality: a systematic review and meta-analysis,” BioMed Research International, vol. 2016, Article ID 8212063, 10 pages, 2016.

J. Wetterslev, K. Thorlund, J. Brok, and C. Gluud, “Trial sequential analysis may establish when firm evidence is reached in cumulative meta-analysis,” Journal of Clinical Epidemiology, vol. 61, no. 1, pp. 64–75, 2008.

S. Weibel and P. Kranke, “Trial sequential analysis: Sample size calculation for reliable meta-analyses,” Der Anaesthesist, vol. 66, no. 2, pp. 91–99, 2017.

J. Brok, K. Thorlund, J. Wetterslev, and C. Gluud, “Apparently conclusive meta-analyses may be inconclusive—trial sequential analysis adjustment of random error risk due to repetitive testing of accumulating data in apparently conclusive neonatal meta-analyses,” International Journal of Epidemiology, vol. 38, no. 1, pp. 287–298, 2009.

K. Thorlund, P. J. Devereaux, J. Wetterslev et al., “Can trial sequential monitoring boundaries reduce spurious inferences from meta-analyses?” International Journal of Epidemiology, vol. 38, no. 1, pp. 276–286, 2009.

G. Koster, J. Wetterslev, C. Gluud et al., “Effects of levosimendan for low cardiac output syndrome in critically ill patients: systematic review with meta-analysis and trial sequential analysis,” Intensive Care Medicine, vol. 41, no. 2, pp. 203–221, 2014.

J. M. Pogue and S. Yusuf, “Cumulating evidence from randomized trials: Utilizing sequential monitoring boundaries for cumulative meta-analysis,” Controlled Clinical Trials, vol. 18, no. 6, pp. 580–593, 1997.

K. Anastasiadis, P. Antonitsis, K. Vranis et al., “Effectiveness of prophylactic levosimendan in patients with impaired left ventricular function undergoing coronary artery bypass grafting: A randomized pilot study,” Interactive CardioVascular and Thoracic Surgery, vol. 23, no. 5, pp. 740–747, 2016.

P. Sharma, A. Malhotra, S. Gandhi, P. Garg, A. Bishnoi, and H. Gandhi, “Preoperative levosimendan in ischemic mitral valve repair,” Asian Cardiovascular and Thoracic Annals, vol. 22, no. 5, pp. 539–545, 2014.

V. V. Lomivorotov, V. A. Boboshko, S. M. Efremov et al., “Levosimendan versus an intra-aortic balloon pump in high-risk cardiac patients,” Journal of Cardiothoracic and Vascular Anesthesia, vol. 26, no. 4, pp. 596–603, 2012.

L. Severi, A. Lappa, G. Landoni et al., “Levosimendan versus intra-aortic balloon pump in high-risk cardiac surgery patients,” Journal of Cardiothoracic and Vascular Anesthesia, vol. 25, no. 4, pp. 632–636, 2011.

H. I. Eriksson, J. R. Jalonen, L. O. Heikkinen et al., “Levosimendan facilitates weaning from cardiopulmonary bypass in patients undergoing coronary artery bypass grafting with impaired left ventricular function,” The Annals of Thoracic Surgery, vol. 87, no. 2, pp. 448–454, 2009.

R. L. Levin, M. A. Degrange, R. Porcile et al., “The calcium sensitizer levosimendan gives superior results to dobutamine in postoperative low cardiac output syndrome,” Revista Española de Cardiología, vol. 61, no. 5, pp. 471–479, 2008.

S. G. De Hert, S. Lorsomradee, S. Cromheecke, and P. J. Van Der Linden, “The effects of levosimendan in cardiac surgery patients with poor left ventricular function,” Anesthesia & Analgesia, vol. 104, no. 4, pp. 766–773, 2007.

E. Al-Shawaf, A. Ayed, I. Vislocky, B. Radomir, N. Dehrab, and R. Tarazi, “Levosimendan or milrinone in the type 2 diabetic patient with low ejection fraction undergoing elective coronary artery surgery,” Journal of Cardiothoracic and Vascular Anesthesia, vol. 20, no. 3, pp. 353–357, 2006.

P. Pollesello, J. Parissis, M. Kivikko, and V.-P. Harjola, “Levosimendan meta-analyses: Is there a pattern in the effect on mortality?” International Journal of Cardiology, vol. 209, pp. 77–83, 2016.

G. Landoni, G. Biondi-Zoccai, M. Greco et al., “Effects of levosimendan on mortality and hospitalization. A meta-analysis of randomized controlled studies,” Critical Care Medicine, vol. 40, no. 2, pp. 634–646, 2012.

K. Jörgensen, O. Bech-Hanssen, E. Houltz, and S.-E. Ricksten, “Effects of levosimendan on left ventricular relaxation and early filling at maintained preload and afterload conditions after aortic valve replacement for aortic stenosis,” Circulation, vol. 117, no. 8, pp. 1075–1081, 2008.

Z. Zhang and K. Chen, “Vasoactive agents for the treatment of sepsis,” Annals of Translational Medicine, vol. 4, no. 17, article no. 333, 2016.

D. G. Katritsis, K. C. Siontis, J. T. Bigger et al., “Effect of left ventricular ejection fraction and QRS duration on the survival benefit of implantable cardioverter-defibrillators: Meta-analysis of primary prevention trials,” Heart Rhythm, vol. 10, no. 2, pp. 200–206, 2013.