Noninvasive assessment of patients undergoing percutaneous intervention in myocardial infarction

Abstracts

FUNDAMENTO: A reestenose pós-intervenção coronariana percutânea primária permanece um problema de relevância clínica, mesmo com o implante de stents. A capacidade das provas não invasivas para detecção de reestenose não foi totalmente demonstrada. OBJETIVO: Avaliar a habilidade do teste ergométrico (TE) e da cintilografia de perfusão miocárdica (CPM) no diagnóstico de reestenose em pacientes com infarto agudo do miocárdio, e supradenivelamento do segmento ST, submetidos à angioplastia coronariana percutânea primária (ACPP), com implante de stent nas primeiras 12 horas de evolução. MÉTODOS: De Ago/2003-Jan/2006, foram selecionados 64 pacientes (ps) (56,2 ± 10,2 anos, 53 homens) submetidos à ACPP. Apenas ps com fração de ejeção do ventrículo esquerdo > 40,0%, definida por ecocardiograma de repouso, foram incluídos. Teste ergométrico, com as 12 derivações do ECG associadas a precordiais direitas, e CPM foram realizados 6 semanas, 6 meses e um ano após o tratamento. Foi realizada cinecoronariografia no 6º mês. RESULTADOS: Doença uniarterial ocorreu em 46,9% dos ps, sendo a artéria descendente anterior tratada em 48,4%. Reestenose angiográfica ocorreu em 28,8%. Sensibilidade, especificidade, valor preditivo positivo (VPP), valor preditivo negativo (VPN) e acurácia do TE para detecção de reestenose não foram significativos. A adição de derivações precordiais direitas não proporcionou informações adicionais. Sensibilidade, especificidade, VPP, VPN e acurácia da CPM apresentaram correlação com reestenose apenas no 6º mês, considerando-se summed difference score > 2 (p = 0,006) e > 4 (p = 0,014). CONCLUSÃO: O TE não discriminou reestenose. A CPM realizada no 6º mês foi relacionada à reestenose e mostrou-se útil durante a evolução.

Reestenose coronária; angioplastia; stent; infarto do miocárdio; procedimentos clínicos

Instituto do Coração (InCor) da Faculdade de Medicina da Universidade de São Paulo, Instituto Dante Pazzanese de Cardiologia, University Of Michigan - AnnArbor - Michigan

Mailing address

ABSTRACT

BACKGROUND: Restenosis after primary percutaneous coronary intervention (PPCI) remains an important clinical problem, even with stent implantation. The ability of noninvasive testing to diagnose restenosis has had only inconsistent demonstration.

OBJECTIVE: Our objective was to evaluate the ability of exercise treadmill testing (ETT) and myocardial perfusion imaging (MPI) to diagnose restenosis in patients treated by PPCI within 12 hours of ST-elevation myocardial infarction (STEMI).

METHODS: From August 2003 to January 2006, 64 patients (mean age of 56.2 ± 10.2 years, 53 males) were enrolled after PPCI. Only patients with left ventricular ejection fraction (LVEF) > 40%, as assessed by resting transthoracic echocardiography (TTE), were included. ETT with 12-lead ECG monitoring and right precordial leads, as also MPI were performed at 6 weeks, 6 months, and one year after intervention. Coronary angiography was performed at six months.

RESULTS: Single-vessel disease was observed in 46.9% of the patients. The left anterior descending coronary artery was treated in 48.4% of the patients. Angiographic restenosis occurred in 28.8%. Sensitivity, specificity, positive predictive value (PPV), negative predictive value (NPV), and accuracy of ETT in detecting restenosis were not significant. Right precordial leads did not add information. MPI sensitivity, specificity, PPV, NPV, and accuracy correlated with restenosis only in the 6-month follow-up, both when considering summed difference score >2 (p=0.006) and >4 (p=0.014).

CONCLUSION: ETT did not discriminate restenosis in this population. MPI performed at 6 months correlated with restenosis and proved useful during follow-up.

Key words: Coronary restenosis; angioplasty; stent; myocardial infarction; critical pathways.

Introduction

Primary percutaneous coronary intervention (PPCI) is superior to fibrinolytic therapy in the treatment of ST-elevation myocardial infarction (STEMI)¹. Due to high rates of restenosis, coronary stenting has emerged as a new strategy, but restenosis still remains a major limitation, with rates for bare-metal stenting ranging from 20% to 25%^2,3.

Appropriate use of noninvasive testing following PPCI has not been systematically investigated. Among the noninvasive tests, exercise treadmill test (ETT) and myocardial perfusion imaging (MPI) have been used to detect restenosis. ETT is safe, simple, and easy to perform. Adding right precordial leads has been used to improve ETT sensitivity⁴. In contrast, the sensitivity and specificity of MPI in detecting restenosis after PCI range from 39% to 100 % and 46% to 100%, respectively, and improve with time after revascularization⁵.

The purpose of the present study was to determine the prognostic value of ETT and MPI in the detection of in-stent restenosis during PPCI follow-up.

Patients and Methods

Primary balloon angioplasty and stenting during the acute phase of myocardial infarction was performed in two centers by experienced surgeons.

The patients underwent ETT, and MPI at 6 weeks, 6 months, and 1 year after intervention.

ETTs were performed with the patients using the medication prescribed, including betablockers. Follow-up coronary angiography was performed at six months. Resting TTE was performed prior to hospital discharge, to evaluate left ventricular ejection fraction (LVEF) and to include the patient in the protocol.

The study was approved by both institutional ethics committees and all patients gave written informed consent. The study was conducted in accordance with the clinical principles of the Declaration of Helsinki regarding research in humans.

Patients

From August 2003 to January 2006, 80 patients treated with PPCI and stenting within 12 hours of STEMI were prospectively selected at Instituto do Coração (InCor) and at Instituto Dante Pazzanesede Cardiologia in São Paulo, Brazil.

The inclusion criteria were: age <75 years, no prior myocardial infarction, Killip class 1⁶, resting LVEF > 40% by TTE, and ability to perform ETT. Bare metal stents were used in all patients. Sixteen patients (20%) were excluded: 5 did not meet the echocardiographic inclusion criteria and 11 withdrew before the final assessment. The remaining 64 patients were followed up for at least one year.

All interventions were performed according to current guidelines, including periprocedural glycoprotein IIb/IIIa inhibitors at the surgeon's discretion⁷.

Angiographic success was defined as residual stenosis in the target vessel < 30% and presence of TIMI flow grade 3⁸. Only the infarct artery was treated.

Study protocol

TTE

TTE studies were performed before hospital discharge with a 3-MHz Ultramark-9 HDI equipment (Advanced Technology Laboratories Inc., Cherry Hills, NJ). The methodology was focused on LVEF determined by Simpson's method⁹. TTE defined the inclusion and further maintenance of the patients inclusion in this protocol.

ETT

All patients underwent symptom-limited ETT using the Bruce protocol¹⁰ and gated-SPECT myocardial perfusion imaging. The patients were monitored by a 12-lead ECG and right precordial leads V3R, V4R, and V5R in order to increase sensitivity and specificity. ETT was performed according to standard guidelines¹¹.

Functional capacity was assessed by exercise duration in minutes and number of METS achieved, applying the Bruce equation¹²(1 MET= 3.5 ml/O₂/kg/min).

Electrocardiographic criteria for ischemia were present if >1 mm horizontal or upslopping ST-segment depression 80 miliseconds after the J point occurred in more than three consecutive QRS complexes with or without chest pain. Downslopping depression was measured at J point.

Typical angina was a clinical criterion for myocardial ischemia. The Duke treadmill score was calculated as previously described¹³.

At peak exercise, 444 to 555 mBQ of Technetium-99m sestamibi were administered intravenously in bolus. The patients continued to exercise for one additional minute before exercise termination. Before the exercise, sestamibi was injected at rest in the same dose. Gated-SPECT scyntigraphy was performed between 60 and 90 minutes after tracer injection.

Myocardial-SPECT perfusion image acquisition protocol

All acquisitions were performed as described elsewhere¹⁴. SPECT (Single Photon Emission Computed Tomography) was performed in a rotating gamma camera (CardioMD, Philips Medical Systems, Milpitas, CA, USA).

Images were acquired using a 64 x 64 image matrix, and a 20% window centered in 140 keV peak. Qualitative and semiquantitative analyses were used to study myocardial perfusion.

For the quantitative analysis, perfusion was classified as normal; transient ischemia (low uptake during exercise only); fibrosis or fixed hypoperfusion (low uptake in both phases); and both fixed and transient hypoperfusion (coexistence of ischemic and fibrotic tissue, low uptake during the stress phase with partial improvement during the resting phase). Two independent observers analyzed the scintigraphic studies.

For the semiquantitative analysis, the left ventricle was divided into 17 anatomic segments and the perfusion defects were analyzed using a score system ranging from zero to 4: 0- normal tracer uptake, 1- mild reduction, 2- moderate reduction, 3- severe reduction, and 4- absence of tracer uptake.

Summed stress scores were obtained by adding the scores of the 17 segments of the stress images, and summed rest scores by adding the scores of the 17 segments at rest.

The summed difference score representing the amount of ischemic myocardium was defined as the difference between the stress and rest scores¹⁵. A summed difference score >2 was considered a reversible defect.

The analysis of all segments allowed us to identify ischemia related to other coronary lesions not treated by PPCI.

Follow-up coronary angiography

All angiographic procedures were performed according to the Judkins technique 6 months after PPCI, using 5 to 6 French guiding catheters.

In-stent restenosis was defined as a >50% diameter stenosis on quantitative coronary angiography.

Endpoints

Major cardiac events were defined as death, nonfatal myocardial infarction, or target vessel revascularization.

Myocardial infarction was defined according to criteria described elsewhere¹⁶.

Target vessel revascularization was defined as a repeat intervention (either surgical or percutaneous) resulting from any lesion located in the vessel treated.

Statistical analysis

Continuous variables were expressed as mean and standard deviation and were compared using the Student's t test.

Categorical variables were described as absolute and relative frequencies.

Sensitivity, specificity, positive predictive value, negative predictive value, and accuracy were calculated for ETT and MPI considering follow-up coronary angiography results.

Associations between categorical variables were verifed using the chi square test or the Fischer's exact test.

The Student's t test or the nonparametric Mann-Whitney test were used for non-normally distributed continuous variables.

The significance level was set at 0.05. Interobserver agreement for the interpretation of the myocardial perfusion images was evaluated using the Kappa statistics.

Results

The clinical characteristics of the patients are shown in Table 1.

The mean time from the onset of symptoms to treatment was 4 hours and the mean door-to-balloon time was 75 minutes.

Coronary angiography

The left anterior descending artery was treated in 31 patients (48.4%), the right coronary artery in 22 (34.4%), the left circumflex in 7 (10.9%), the left main coronary artery in 2 (3.1%), the large diagonal branch in 1 (1.56%), and a saphenous vein bypass graft in 1 (1.56%).

Multivessel disease (other coronary lesions > 50%) was found in 34 patients (53.1%).

Complete revascularization was achieved in 30 patients with single vessel disease and in three with multivessel disease previously revascularized.

Mean pre- and post- procedural reference diameters were 2.9 ± 0.5 mm and 3.2 ± 0.4 mm, respectively. Mean pre- and post- procedural minimal luminal diameters were 0.34 ± 0.4 mm and 2.81± 0.4 mm, and mean pre- and post-procedural diameter stenoses were 87.7% ± 14.6 % and 7.5 ± 4.2%. respectively.

Follow-up coronary angiography was performed in 59/64 patients, 3 before six months (one in the third month due to angina and 2 in the fourth month due to acute coronary syndrome).

Angiographic restenosis occurred in 17 patients (28.8%), 8 with 50.0%-70.0% stenosis and 9 with > 70% stenosis. Repeat target vessel revascularization was performed in 18.6% of the cases. The final reference vessel diameter was 2.63 ± 0.72 mm and final minimal luminal diameter was 1.95 ± 0.90 mm. Final mean percent diameter stenosis was 39 ± 25.0%.

No difference in restenosis occurred in patients with single or multivessel disease.

TTE

The mean LVEF found in the tests for patient inclusion in the protocol was 0.55.

ETT

The tests were performed with the patients receiving the medication prescribed after hospital discharge.

During the ETT performed at 6 weeks, 6 months, and 12 months, 85.0%, 79.0%, and 66.7% of the patients were using betablockers, and 45.9%, 7.5%, and 7.5% were using clopidogrel or ticlopidine, respectively. ETT data are shown in Table 2.

Sensitivity, specificity, PPV, NPV, and accuracy regarding results of ETT compared with follow-up angiography are seen in Table 3. When considering patients who reached 85.0% of maximum predicted heart rate, sensitivity, specificity, PPV, NPV, and accuracy for the detection of restenosis were 63.6%, 67.7%, 41.2%, 84.0%, and 66,7%, respectively, at 6 weeks (p=0.086); 55.6%, 83.3%, 55.6%, 83.3%, and 75.7% at 6 months (p=0.073); and 40.0%, 66.7%, 30.8%, 75.0%, and 59.4% at 12 months (p= 0.716) after treatment of myocardial infarction.

There was no correlation between restenosis and the Duke treadmill score, exercise duration, exercise angina, ST-segment depression, or right precordial lead abnormalities.

An increase in exercise duration was observed between the first and the second ETT (p=0.004) and between the first and the third ETT (p=0.004) in the 46 patients who performed all 3 tests. The same was observed for the number of METS achieved (p=0.002 and p=0.004, respectively).

Myocardial perfusion imaging

The results of MPI according to qualitative analysis are summarized in Table 4.

The semiquantitative analysis considered transient ischemia as a summed difference score > 2; for the same sample scores > 4 were also evaluated.

The results of this analysis are shown in Table 5. Interobserver reproducibility showed substantial agreement with Kappa of 0.762 (95% CI 0.51-1.0), p < 0.001¹⁷.

The summed difference score during the first year in 46 patients who underwent all sequential MPI did not show any statistical significance (p=0.194). The comparison between summed difference scores performed 6 weeks, 6 months, and one year after PPCI and restenosis was not statistically significant (p = 0.056).

Summed stress scores and summed rest scores were compared with restenosis in all MPI, and classified as 0 to 4, 4 to 8, and >8 according to the amount of damaged myocardium.

There was a correlation between the amount of damaged myocardium and restenosis at 1 year at rest (p=0.0019) and after exercise (p=0.004).

Follow-up

Angiographicrestenosis occurred in 17/59 patients (28.8%). Subacute stent thrombosis was observed 27 days after PPCI in 1 patient. Non-ST-elevation acute coronary syndrome occurred in 2 patients during the fourth month (one of them treated by surgical revascularization and the other by balloon angioplasty).

Restenosis was treated in 11 patients (18.6%) by means of surgical revascularization in 3 (1 with restenosis > 50.0% and < 70.0% plus angina) and angioplasty in 8 (2 with restenosis >50.0% and < 70.0% plus angina). In 6 patients with restenosis, no procedure was performed.

Angioplasty was performed in 7 patients in non-infarct arteries. No death was observed during follow-up.

Forty-four patients remained asymptomatic during the first year, 11 patients had chest pain up to six months (7 with restenosis, of whom 5 had a lesion >70.0% ), and 9 reported symptoms after 6 months of follow-up.

Discussion

Angiographic restenosis occurred in 17 patients (28.8%). Restenosis rates in the PAMI-PILOT study¹⁸, STENT-PAMI trial¹⁶, and CADILLAC study³ were 27.0%, 23.0% and 22.0%, respectively.

Similar to Cutlip et al¹⁹, we followed up our patients for one year to measure the real success rate¹⁹.

The STENT-PAMI¹⁶ and CADILLAC³ trials followed up their patients for 6 months, while the GRAMI²⁰ and STENTIM²¹ trials reported a 12-month follow-up. Late repeat intervention after PPCI was performed in 3.6% to 22.7% of the cases^3,16,22. In our study, the rate of target vessel revascularization was 18.6%.

The appropriate use of noninvasive tests for the diagnosis of restenosis after PPCI remains controversial.

ETT is routinely used to detect residual ischemia, to assess exercise capacity, and for risk stratification after acute myocardial infarction. It is the most commonly used test for evaluating patients after PCI^23-25.

It is known that acute exercise can lead to a transient prothrombotic state in patients with coronary artery disease²⁶. Cases of in-stent thrombosis within hours after ETT have been previously reported^27,28. In our study, ETT was safely performed.

The current ACC/AHA guidelines¹¹ for ETT post-PCI do not recommend routine screening for detection of restenosis, but there are insufficient data to determine the correct ETT strategy, especially in patients at high risk of restenosis such as those in the proximal LAD.

The rationale of the strategy of routine indication of functional tests after PCI is based on the theory that the diagnosis of silent ischemia can stratify patients at higher risk⁵. Previous studies demonstrated that ETT has low sensitivity and ability to localize ischemia^11,29. Chest pain is an unreliable index of restenosis after PCI, since approximately 50.0% of patients with restenosis remain asymptomatic and, conversely, up to 45.0% of patients developing chest pain do not have angiographic restenosis⁵.In patients with incomplete revascularization, the ischemic response may result from either stent restenosis or myocardial ischemia unrelated to the target vessel.

A meta-analysis showed ETT sensitivity and specificity to be of 46.0% and 77.0%, respectively, for restenosis > 50.0%; and 50.0% and 84.0%, respectively, for restenosis > 70.0%²⁹. ETT performed 6 weeks after myocardial infarction showed low sensitivity and moderate specificity. Although ETT for the detection of restenosis had been performed 6 months after the procedure, we did not find improved sensitivity and specificity in relation to the earlier ETT; however, its high negative predictive value stresses the importance of a nonischemic test in the clinical approach to these patients.

Similar results regarding sensitivity and specificity, with lower negative predictive value (61.0%), were reported in symptomatic patients after PCI²⁵.

ADORE was the first trial to compare the strategies of routine and selective ETT after PCI; this study evaluated patients undergoing complete revascularization with no angiographic follow-up, and found no benefits with routine ETT in relation to selective ETT, which was performed in symptomatic patients³⁰.

In our study, no association with restenosis was found in the presence of complete or incomplete revascularization, even in patients who achieved more than 85.0% of maximum predicted heart rate. Our data confirm the low sensitivity of angina and electrocardiographic changes during exercise for the detection of restenosis³¹.

Improved ETT sensitivity was not observed when right precordial leads were included; this corroborates the findings from other studies^32,33 but not Michaelides et al's findings⁴.

The mean METS obtained was 8, which can be explained by our strict inclusion criteria, such as LVEF > 40.0%. In post-infarction patients, exercise capacity > 4 METS in association with LVEF > 40.0% was correlated with a favorable outcome³⁴. According to the DANAMI-2 trial, post-infarction patients with low exercise capacity had higher mortality rates³⁵.

Exercise MPI has better diagnostic ability than ETT alone²⁵. MPI is frequently performed after PCI to detect restenosis and to identify other areas of myocardial ischemia unrelated to the target-vessel³⁶. In our study, MPI performed at 6 weeks showed low sensitivity, which could be explained by intermediary lesions or by the use of medications. Specificity and negative predictive value were moderate.

Given the high false positive rate, MPI early (<3 months) after PCI should not be routinely indicated⁵. Rodes-Cabau et al³⁷ detected reversible defects in 17.0% of the patients who underwent MPI one week after PPCI, with 50.0% sensitivity and 54.0% specificity. Nevertheless, this finding may not exclude the possibility of restenosis. In 2 of our patients who presented with acute coronary syndrome during the fourth month of follow-up, no reversible ischemia was observed 6 weeks after PPCI.

In our study, MPI performed at 6 and 12 months showed low rates of sensitivity, but high rates of specificity, especially at 6 months, considering summed difference score > 2 and > 4. Sensitivity, specificity, and positive and negative predictive values may have been affected by drug therapy. The accuracy of MPI performed 6 months following PCI is usually very good⁵.

Galassi et al³¹ found similar accuracy (83.0%) in patients who did or did not achieve maximum heart rate during exercise testing. The authors concluded that the most important characteristic is the homogeneity of the study population, like in our sample, in terms of type of stress and time interval between stenting and scintigraphy, and between scintigraphy and follow-up angiography. The inclusion of territories with previous myocardial infarction did not affect the accuracy of MPI. Unlike in our study, only complete revascularization was assessed.

Isaaz et al³⁸ recently reported a poor correlation between stress SPECT imaging and angiographic restenosis at 6 months in 149 patients treated by PPCI who remained asymptomatic during the follow-up. They showed sensitivity, specificity, positive predictive value, negative predictive value and accuracy of 48.0%, 61.0%, 35.0%, 72.0% and 57.0%, respectively, for the detection of restenosis. The authors followed up 78 patients with single vessel disease for two years and a half³⁸.

Our results showed better specificity and negative predictive value. Kosa et al³⁹ reported that preexisting myocardial perfusion abnormalities in territories with previous infarction may result in lower sensitivity and specificity values. Population heterogeneity may account for some of the discrepancies observed in these studies.

The sensitivity and specificity of MPI performed at different times after PCI range from 39.0% to 100.0%, and from 46.0% to 100.0%, and improve with time after revascularization⁵.

The presence of reversible defects on MPI performed between 12 and 18 months after PCI is associated with an increased risk of events in the follow-up. The extent and severity of reversible perfusion defects on SPECT strongly predict event-free survival late after PCI¹⁵. This information was the basis for including MPI assessment one year after the procedure in our study.

LVEF < 40.0% as determined by gated SPECT was correlated with a poor prognosis during follow-up⁴⁰. In our case series, the good outcome may be explained by the LVEF > 45.0% observed on follow-up MPI.We know that patients with ejection fraction > 40.0% are not always found in the real world. However, in tertiary care centers, PPCI can be performed within the first few hours after myocardial infarction. Thus, it is possible to find patients with preserved ejection fraction and thereby obtain information from noninvasive tests similar to that obtained after elective PCI.

Clinical implications

The negative predictive value for MPI performed 6 months after the PPCI is high. The absence of reversible ischemia can be considered indicative of the absence of restenosis (or of the functional expression of restenosis) in these selected patient sample.

Study limitations

The limitations of this study include small sample size, inclusion of only Killip class 1 patients with LVEF > 40.0%, and maintainence of usual medications during the entire protocol.

The small sample was related to the occurrence of several trials running at the same time in both institutions, thus not allowing the same patient in more than one trial.

The selection of patients with LVEF > 40.0% was made to ensure that they could undergo ETT.

Maintainance of drugs such as betablockers may affect the heart rate response to exercise, but our intention was to evaluate a real-world sample of patients after PPCI.

Conclusions

In conclusion, ETT showed low sensitivity to detect restenosis after PPCI during the follow-up. The inclusion of right precordial leads did not provide additional information.

MPI performed 6 months after PPCI correlated with restenosis, showing high specificity and NPV in this patient population.

Potential Conflict of Interest

No potential conflict of interest relevant to this article was reported.

Sources of Funding

There were no external funding sources for this study.

Study Association

This article is part of the thesis of doctoral submitted by Rica Dodo Delmar Buchler, from Faculdade de Medicina da Universidade de São Paulo.

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Noninvasive assessment of patients undergoing percutaneous intervention in myocardial infarction

Rica Dodo Delmar Buchler; Expedito E. Ribeiro; Antonio de Padua Mansur; Paola Smanio; Romeu Sergio Meneghelo; William Azem Chalela; Carlos Alberto Buchpiguel; Jorge Roberto Buchler; Eric R. Bates; Eulogio E. Martinez

Publication Dates

• Publication in this collection
  22 Oct 2010
• Date of issue
  Oct 2010

History

• Received
  20 May 2009
• Accepted
  13 May 2010
• Reviewed
  04 Apr 2010