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Advances in Interventional Cardiology/Postępy w Kardiologii Interwencyjnej
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vol. 15
Original paper

Successful primary percutaneous coronary intervention determines the very long-term prognosis in ST-segment elevation myocardial infarction even in survivors of the acute phase. The ANIN Myocardial Infarction Registry

Magdalena Polańska-Skrzypczyk
Maciej Karcz
Witold Rużyłło
Adam Witkowski

Adv Interv Cardiol 2019; 15, 3 (57): 283–291
Online publish date: 2019/09/18
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Based on 9-year follow-up of 1064 consecutive patients with ST-segment elevation myocardial infarction (STEMI) treated with primary percutaneous coronary intervention (pPCI) we demonstrated unexpectedly good prognosis of those patients. Over 70% of patients were alive at the end of follow-up and over 80% did not experience cardio-vascular death. Angiographic results of pPCI were associated with very long-term survival, even after exclusion of patients who deceased by day 30. Only final thrombolysis in myocardial infarction (fTIMI) 3 flow, but not TIMI 2 flow improved 9-year prognosis. Very long-term clinical outcomes were best in patients with patent infarct related artery (IRA) both at baseline and after pPCI. Finally, although longer total ischaemic time (TIT) was associated with higher rate of IRA patency at baseline, it was also associated with smaller procedural success rate and poorer survival. Even in patients with final TIMI 3 flow prognosis declined with increasing TIT.


It is well documented that successful primary percutaneous coronary intervention (pPCI) saves lives in the acute phase of ST-elevation myocardial infarction (STEMI) and improves mid-term prognosis. Both in-hospital and mid-term mortality are significantly lower in comparison with fibrinolytic treatment (relative reduction in risk 39% and 27%, respectively) [1, 2]. This is primarily due to the lower incidence of full recanalisation during fibrinolysis [3].

Successful pPCI results in up to 98% in-hospital and 95% 1-year survival in clinical trials that exclude high-risk patients [4]. Despite the high rate of successful pPCI, prognosis varies widely. Survival with regard to pPCI results and total ischaemic time (TIT) has not been well established although a meta-analysis of fibrinolytic trials confirmed lower survival rates with increasing TIT, which was partly explained by decreasing efficacy of lysis with treatment delay [5].

Furthermore, there are limited data on whether those benefits remain significant in the very long-term follow-up. Some data presented previously were related to the long-term observation but a heterogeneous group of patients [6].

The prognostic significance of pPCI results in survivors of the acute phase of STEMI is uncertain, while it is known that the risk of death is highest during the first month after STEMI and declines over time [6].


We sought to investigate the impact of initial and final thrombolysis in myocardial infarction (TIMI) flow on long-term survival considering TIT, the cause of death and to determine independent factors associated with pPCI results in a homogeneous, unselected group of patients with STEMI undergoing pPCI at a high-volume centre.

Material and methods

A prospective, single-centre ANIN Myocardial Infarction Registry was set up at the Institute of Cardiology in Warsaw enrolling all consecutive STEMI patients undergoing pPCI between February 2001 and October 2002, which was previously described in detail [7, 8]. Of note, since February 2001, coronary angiography and pPCI whenever indicated have been the sole method of reperfusion in STEMI patients in our tertiary centre. Clinical, angiographic and procedural data were prospectively collected. There were no exclusion criteria; particularly, patients with advanced age, cardiogenic shock, pulmonary oedema or known renal dysfunction were not excluded. TIT was defined as the time from symptom onset to pPCI.

Primary angioplasty was performed in all patients in compliance with concurrent standards. Except for patients in cardiogenic shock, only the infarct-related artery (IRA) was recanalised. Bare metal stents (BMS) were implanted in all significant stenoses in the IRA, unless the artery tortuosity, massive calcification or small diameter precluded stenting and plain balloon angioplasty was performed. No manual or mechanical thrombectomy was used at that time. Rescue abciximab was administered in case of angiographic evidence of massive thrombus, slow or no-reflow or thromboembolic complications of pPCI. All patients received combination of acetyl salicylic acid with clopidogrel or ticlopidine.

According to initial TIMI flow (iTIMI) patients were divided into two groups: the occluded IRA group (iTIMI flow 0 or 1) and the patent IRA group (iTIMI flow 2 or 3). Procedural success was defined as final TIMI (fTIMI) flow 3, while failure was defined as a fTIMI 0 to 2 flow. Major adverse cardiac and cerebrovascular events (MACCEs) were defined according to generally approved criteria (reinfarction, stroke, major bleeding and in-hospital mortality). Renal dysfunction was defined as estimated glomerular filtration rate (eGFR) below 60 ml/min/1.73 m2 [9].

Thirty-day and 1-year survival (respectively short- and mid-term survival) were verified by telephone calls to patients or their cardiologists. Long-term mortality data, including cause of death, were obtained from the National Census Registry. Cardiovascular cause of death was defined according to the Tenth Revision of International Classification of Disease (ICD-10) as described before [10]

Patients who were alive after day 30 formed the subgroup of survivors of the acute phase.

The study complies with the Declaration of Helsinki and its research protocol was approved by the ethics committee.

Statistical analysis

Typical statistical methods were used and previously described [7, 8]. Time-to-event data were summarised as Kaplan-Meier estimates and compared with the log-rank test. To adjust for baseline differences between study groups, all variables potentially associated with the clinical endpoint were tested in multivariate analyses; the Cox proportional hazards model (forward stepwise variable) was used to identify independent predictors of mortality. Results were presented as hazard ratios (HRs) with 95% confidence intervals (CIs). All statistical analyses were performed using SPSS version 17.0 (SPSS Inc, Chicago, IL, USA).


Baseline characteristics

A total of 1064 consecutive patients with STEMI underwent coronary angiography and were treated with pPCI. Clinical and demographic characteristics of studied patients, which were typical for STEMI cohort of patients, are shown in Table I. Total ischaemic time was shorter than 3 h in 350 (33%) patients, ranged between 3 and 6 h in 461 (44%) patients and exceeded 6 h in 186 (18%) patients.

Table I

Baseline and angiographic characteristics of patients according to initial and final TIMI flow

Parameter (%)All patients (n = 1064)Patients with iTIMI < 2 (n = 871)Patients with iTIMI ≥ 2 (n = 193)P-valuePatients with fTIMI < 3 (n = 177)Patients with fTIMI 3 (n = 885)P-value
Age60 ±1260 ±1260 ±110.3860 ±1258 ±100.04
Female283 (27)235 (27)48 (25)0.5855 (31)228 (26)0.16
H/O CAD458 (43)357 (41)101 (53)0.00584 (48)373 (42)0.21
H/O MI218 (21)174 (20)44 (23)0.5748 (27)170 (19)0.02
H/O hypertension501 (48)405 (47)96 (50)0.4290 (51)412 (47)0.32
Diabetes mellitus138 (13)107 (12)31 (16)0.1527 (15)111 (13)0.34
Current smokers528 (50)443 (51)85 (44)0.0957 (32)470 (53)< 0.0005
Renal dysfunction318 (36)261 (36)57 (35)0.9166 (47)252 (34)0.004
Heart rate80 ±2080 ±2080 ±190.8179 ±1982 ±190.04
SBP133 ±30130 ±30136 ±300.54132 ±29137 ±310.23
Killip class > 1130 (12)108 (13)22 (12)0.6929 (16)101(12)0.07
Cardiogenic shock43 (4)36 (4)7 (4)0.7419 (11)24 (3)< 0.0005
Unconscious38 (4)33 (4)5 (3)0.5214 (8)24 (3)0.003
TIT > 3 h646 (61)511 (59)135 (70)0.02118 (67)528 (60)0.03
MVD564 (53)467 (54)97 (51)0.47108 (61)456 (52)0.03
Stent implantation815 (77)654 (76)161 (84)0.1497 (54)718 (82)< 0.0005
Planned abciximab320 (30)269 (31)51 (27)0.2243 (25)277 (32)0.07
Rescue abciximab172 (16)153 (18)19 (10)0.00757 (33)115 (13)< 0.0005
fTIMI 3 flow885 (83)706 (81)179 (93)< 0.0005

[i] Values are n (%) or mean ± SD. iTIMI – initial thrombolysis in myocardial infarction flow, fTIMI – final thrombolysis in myocardial infarction flow, h/o CAD – history of coronary artery disease, h/o MI – history of myocardial infarction, SBP – systolic blood pressure, TIT – total ischaemic time, h – hours, MVD – multivessel disease.

Angiographic characteristics and procedural results

Angiographic characteristics and procedural results were typical for a cohort of STEMI patients treated with pPCI. The numbers of patients with iTIMI 0, 1, 2 and 3 flow were 797 (75%), 74 (7%), 97 (9%) and 96 (9%), respectively. Patients with patent compared to occluded IRA more often had a history of CAD and longer TIT. There were no differences in the prevalence of renal dysfunction, diabetes mellitus, hypertension, Killip class > 1, cardiogenic shock or multivessel disease (Table I).

In most patients, only the IRA was treated. Final TIMI 0, 1, 2, 3 flow was observed in 66 (6%), 31 (3%), 80 (8%) and 885 (83%) patients, respectively. Procedural results of two patients were missing. As shown in Table I procedural success was achieved more often in younger patients, current smokers, with shorter TIT and patent IRA at baseline. In contrast, success was achieved less often in patients with a history of myocardial infarction, renal dysfunction, multivessel disease and index STEMI complicated by cardiogenic shock.

Patients with TIT exceeding 3 h had a lower incidence of occluded IRA at baseline (79% vs. 86%, p = 0.006) but a lower procedural success rate (82% vs. 87%, p = 0.03). In those patients, but not in patients with TIT < 3 h, initial IRA patency was found to be the strongest predictor of fTIMI 3 flow.

Clinical outcomes

During a mean of 8 ±7 days of hospitalisation, MACCEs occurred in 63 (6%) patients. Major bleeding occurred more often in patients with PCI failure, independently of iTIMI flow or abciximab administration (p = 0.6) (Table II). Procedural failure was found to be an independent risk factor of major bleeding.

Table II

In-hospital MACCEs and overall mortality according to initial and final TIMI flow

ParameterAll patients (n = 1057)Patients with iTIMI < 2 (n = 864)Patients with iTIMI ≥ 2 (n = 193)Multivariate analysis OR (95% CI)P-valuePatients with fTIMI < 3 (n = 177)Patients with fTIMI 3 (n = 880)Multivariate analysis OR (95% CI)P-value
 re-MI16 (2)14 (2)2 (1)0.755 (3)11 (1)0.17
 Major bleeding40 (4)35 (4)5 (3)0.419 (11)21 (2)3.3 (1.5–7.9)0.004
 Stroke7 (1)6 (1)1 (1)1.01 (1)6 (1)0.86
 In-hospital mortality41 (4)35 (4)6 (3)0.5524 (14)17 (2)4.4 (1.6–12.0)< 0.0005
All-cause mortality:
 30-day57 (5)49 (6)8 (4)0.3430 (17)27 (3)3.1 (1.7–5.8)< 0.0005
 1-year86 (8)74 (8)12 (6)0.2136 (20)50 (6)2.5 (1.5–4.2)< 0.0005
 9-year294 (28)254 (29)40 (20)0.1676 (43)218 (25)1.5 (1.1–2.0)< 0.03
CV mortality:
 30-day51(5)45 (5)6 (3)0.2627 (15)24 (3)2.9 (1.5–5.5)< 0.0005
 1-year68 (6)59 (7)9 (5)0.3431 (18)37 (4)2.1 (1.1–3.8)0.002
 9-year196 (19)167 (19)29 (15)0.0862 (35)134 (15)1.8 (1.3–2.7)< 0.0005

[i] Values are n (%) or mean ± SD. iTIMI – initial thrombolysis in myocardial infarction, fTIMI – final thrombolysis in myocardial infarction, re-MI – reinfarction, CV – cardiovascular, MACCEs – major adverse cardiac and cerebrovascular events.

For censored observations duration of follow-up ranged from 7 to 9 years. Five patients were lost to follow-up. In the final analysis 1057 patients were included. All-cause and CV mortality rates are shown in Table III. Of note, over 70% of patients were alive at the end of follow-up and over 80% did not experience CV death. Over time the percentage of CV deaths among all deaths decreased substantially from 100% in hospital, over 87% at 1 month, 79% at 1 year to 66% at 9 years of follow-up.

Table III

Multivariate analysis of long-term mortality

ParameterAll patients (n =1057)Survivors of acute phase of STEMI (n = 1000)
All-cause mortality n = 294 (28%)CV mortality n = 196 (19%)All-cause mortality n = 237 (24%)CV mortality n = 145 (15%)
HR (95% CI)P-valueHR (95% CI)P-valueHR (95% CI)P-valueHR (95% CI)P-value
Age (every 10 years)1.9 (1.7–2.3)< 0.00051.6 (1.3–1.9)< 0.00051.9 (1.7–2.3)< 0.00051.8 (1.5–2.2)< 0.0005
Current smoker0.7 (0.6–1.3)0.020.7 (0.5–1.0)0.130.6 (0.4–0.9)0.0060.6 (0.4–0.8)0.006
H/o MI0.060.071.6 (1.1–2.2)0.0052.0 (1.3–2.9)0.001
Heart rate (every 10/’)1.2 (1.1–1.3)< 0.00051.2 (1.1–1.3)< 0.00051.2 (1.1–1.3)< 0.00051.3 (1.1–1.4)< 0.0005
Renal dysfunction1.3 (1.0–1.7)0.081.7 (1.2–2.4)0.0030.091.7 (1.2–2.5)0.007
Diabetes mellitus1.6 (1.1–4.4)0.0091.4 (1.0–2.1)0.221.6 (1.1–2.2)0.020.51
Cardiogenic shock3.2 (1.9–5.2)< 0.00053.6 (2.0–6.5)< 0.00050.110.27
TIT > 3 h1.3 (1.0–1.9)0.041.4 (1.0–2.0)
MVD1.4 (1.1–1.9)0.021.7 (1.2–2.0)0.0030.160.06
iTIMI < 20.890.21.5 (1.0–2.3)0.040.17
fTIMI < 31.5 (1.1–2.0)0.031.8 (1.3–2.7)0.0010.111.8 (1.2–2.8)0.005

[i] HR – hazard ratio, CI – confidence interval, CV – cardiovascular, h/o MI – history of myocardial infarction, TIT – total ischaemic time, MVD – multivessel disease, iTIMI flow – initial TIMI flow, fTIMI flow – final TIMI flow, ns – non-significant.

An association between iTIMI flow and survival was observed only with all-cause but not cardiovascular mortality and only towards the end of the follow-up period, but still iTIMI was not an independent predictor of mortality in the whole cohort of patients (Table III). Procedural success was independently associated with all-cause and CV mortality from the beginning of observation. Results of the multivariate analysis are summarised in Table II. As depicted in Figure 1, long-term mortality was higher in patients with lower grades of fTIMI flow. However, the difference was significant only between patients with fTIMI 3 and lower (Figure 1 A). The mortality curves divided further after initial IRA patency was taken into consideration (Figure 2).

Figure 1

Kaplan-Meier curves of cumulative all-cause mortality according to fTIMI flow: A – fTIMI 0–1 vs. 2 vs. 3 flow, B – fTIMI 0–2 vs. 3 flow

Figure 2

Kaplan-Meier curves of cumulative all-cause mortality according to iTIMI and fTIMI flow


Mortality rate was strictly dependent on TIT. Among patients with procedural success, 19% (59 patients) died with TIT shorter than 3 h, 25% (95 patients) with TIT between 3 and 6 h, 33% (47 patients) with TIT longer than 6 h. It was equivalent to 24% relative reduction of mortality between groups.

Comparing patients with successful and failed PCI in the previously defined TIT ranges, odds ratios were 1.9 (95% CI: 1.1–3.4, p = 0.03), 2.1 (95% CI: 1.4–3.1, p < 0.0005) and 1.7 (95% CI: 1.0–2.8, p = 0.04), respectively.

A total of 1000 (95%) patients survived the acute phase. At nine years all-cause and CV mortality rates in this subgroup were 24% (n = 237) and 15% (n = 145), respectively.

Prognostic factors of long-term mortality

After adjustment for co-variates, PCI failure was an independent predictor of long-term all-cause and CV mortality (Table III). In the subgroup of patients who survived the acute phase iTIMI flow was an independent predictor of all-cause mortality, and fTIMI flow was an independent predictor of CV mortality (Table III).


Results from this large prospective registry of patients with STEMI undergoing pPCI demonstrate the following significant findings:

  1. Favourable very-long term outcomes.

  2. Results of pPCI determine very long-term survival, including in survivors of the acute phase of STEMI.

  3. Only fTIMI flow 3, but not fTIMI 2, improves prognosis.

  4. Patients with patent IRA both at baseline and after pPCI have the most encouraging prognosis.

  5. Procedural success is closely associated with iTIMI flow; however, iTIMI flow is not a predictor of all-cause mortality except in survivors of the acute phase of STEMI.

  6. Longer TIT, although associated with a higher rate of patent IRA, results in less procedural success and poorer survival.

  7. Even in patients with fTIMI 3 flow, prognosis declines with increasing TIT.

At the beginning, we would like to emphasise the very long period of observation of a homogeneous group of patients treated in a uniform manner and lack of exclusion criteria. To our best knowledge, the longest follow-up period of STEMI cohort patients undergoing PCI before now was 6 years [6].

Our results revealed an unexpectedly good prognosis of STEMI patients treated with pPCI. Over 70% of patients were alive at the end of the 9-year follow-up and over 80% did not experience CV death. The mortality rate beyond the first year ranged from 2.4% to 3.7% per year, which is close to the result reported for a comparably aged broad general population cohort.

Our finding is in accordance with previously described results for short- and mid-term observation [11, 12]. We found that procedural failure, although uncommon after pPCI, is also a predictor of very long-term mortality. Moreover, very long-term prognosis was worse following pPCI failure even in survivors of the acute phase (K-M survivor curves diverged further beyond day 30 (Figure 3 B)). Our analysis demonstrates a fourfold greater mortality risk in patients with procedural failure in short-term, threefold in mid-term and almost twofold in long-term follow-up. It should be stressed that patients with fTIMI flow 2 have mortality rates similar to those of patients with fTIMI flow grade 0 and 1. It suggests that only full restoration of epicardial blood flow counts. However, it appears that there is a significant difference in survival with regard to the interaction of initial TIMI flow and final TIMI flow. Mortality was lowest in patients with a patent IRA both at baseline and after PCI, intermediate in patients with TIMI flow 3 restored after angioplasty, and highest in patients with procedural failure, especially those in whom epicardial blood flow had deteriorated.

Figure 3

Kaplan-Meier curves of cumulative mortality in survivors of acute phase of STEMI according to: A – iTIMI flow, B – fTIMI flow


Although initial IRA patency is associated with a higher rate of procedural success, prognosis of patients with an initially patent IRA did not differ from patients with an initially occluded IRA until the 2 last years of follow-up. A significant difference was noted only at the end of the follow-up period when more than one-third of deaths were of non-cardiovascular aetiology. However, iTIMI flow was found to be an independent risk factor for long-term all-cause mortality in survivors of the acute phase, but not CV mortality.

Our finding is at variance with a previous study in which iTIMI flow predicted early and intermediate survival [13]. In contrast to our study, patients were categorised according to iTIMI flow into groups of TIMI flow 0–2 and 3. The frequency of iTIMI 3 was twice as high, probably due to the criteria of enrolment (both STEMI and non-STEMI included). Moreover, the relationship between iTIMI flow and mortality was on the border of significance. A more recent study showed that iTIMI flow is a prognostic factor only in the case of high-risk patients according to TIMI risk score, whereas fTIMI flow is an independent predictor of mortality in a whole cohort of patients [14]. Another study demonstrated a significant correlation between iTIMI flow and infarct size, myocardial salvage index, and microvascular obstruction assessed by cardiac magnetic resonance, with no relation to mid-term mortality [15]. Perhaps, in our study, prolonged time of observation revealed the effect of changes in the ischaemic heart disease leading to heart failure.

Furthermore, our results demonstrated a strong relationship between TIT and effect of pPCI and mortality. Total coronary occlusion by acute thrombus formation was more frequent during the early hours of STEMI and decreased in frequency over time due to spontaneous recanalization. In the first 3 h of ischaemia, the procedural success was independent of the initial TIMI flow. Only renal dysfunction, which was previously described as a predictor of procedural failure [16, 17], was associated with fTIMI flow < 3. That correlation is probably related to endothelial function, spontaneous lysis of the clot and endogenous thrombolysis, which is impaired in renal dysfunction [18]. Conversely, in patients with TIT longer than 3 h, the most important factor associated with the procedural result is iTIMI flow. Angiographic TIMI 0 or 1 flow at presentation was associated with a fourfold higher likelihood of procedural failure, whereas the risk was twofold if the patient presented with TIMI 2 flow. The clinical benefits of spontaneous reperfusion before intervention are also time dependent. Pioneering work [19] established that in animal models the extent of myocardial necrosis could be reduced by early reperfusion of the myocardium after a coronary occlusion. Probably TIT below 3 h was associated with limited myocardium cell damage, while exceeding that time might lead to poor tissue perfusion or the “no reflow” syndrome. Therefore, even in patients with successful PCI there was a 24% increase in mortality when TIT exceeded 3 h compared to shorter TIT.

A similar phenomenon was seen in patients with TIT longer than 6 h and below that time. However, even in patients with TIT longer than 6 h, survival of patients with successful PCI was significantly better than in those with pPCI failure. Our results strongly support the importance of achieving TIMI 3 flow as soon as possible and are in accordance with the 2017 ESC guidelines for STEMI treatment [20] that emphasised the significance of revascularisation during the first 3 h of ischaemia.

When the analysis was limited to survivors of the acute phase of STEMI, long-term mortality was significantly higher in patients with an occluded versus patent artery at baseline. Although the PCI result is a predictor of CV mortality in that group of patients, the difference in all-cause mortality rate is also prominent (Figure 3 B).

In the whole group of patients, analysing factors associated with iTIMI flow we found that a patent IRA was observed more often in patients with a history of CAD and longer TIT. There were no differences between patients with a patent and an occluded IRA in the prevalence of renal dysfunction, diabetes mellitus, hypertension, heart failure, cardiogenic shock or multivessel disease. Previous studies demonstrated a lack of correlation between diabetes mellitus and patency of the IRA [21]. Nevertheless, it was shown that diabetic patients have a significantly narrower “normal” reference segment of the IRA than non-diabetic patients, suggesting more extensive, non-angiographically identifiable epicardial coronary artery disease which may already affect the prognosis [22].

The pPCI success depends on several factors. Our results are in accordance with previous studies [23] and confirm that the most critical factors related to the success of angioplasty are initial IRA patency, age, heart rate and smoking status. As shown before, current smokers were more likely to have better angiographic results. This correlation might be related to younger age and lower co-morbidity of smokers, which was explained before by different thrombus characteristics. It confirmed the “smoker’s paradox”.

The higher rate of pPCI failure in patients with advanced age, history of myocardial infarction, renal dysfunction, longer TIT, cardiogenic shock or lower initial TIMI flow contributes to worse prognosis of these patients.

Finally, pPCI failure was found to be a strong predictor of major bleeding, which may in part be associated with a higher rate of rescue abciximab administration.


Based on very long-term observation of a homogeneous, unselected group of patients we demonstrated a favourable prognosis of STEMI patients treated with pPCI. Moreover, we confirmed the crucial role of timely and successful pPCI in 9-year outcomes, including in survivors of the acute phase. The mortality rate increased with TIT even in patients with pPCI success. Timely pPCI not only saves patients’ lives acutely but also offers them survival for many years to come. Therefore, all efforts should be made with the aim of shortening the ischaemic time and achieving full recanalization of the IRA (fTIMI 3 flow).

Conflict of interest

The authors declare no conflict of interest.



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