|Year : 2020 | Volume
| Issue : 3 | Page : 134-138
Safety and efficacy of streptokinase, tenecteplase, and reteplase in patients diagnosed with ST-elevation myocardial infarction: A comparative study
Bhargavi Neela1, Vineeth Reddy Gunreddy1, Mamatha Reddy Chandupatla2, Venkateshwarlu Eggadi1, Sheshagiri Sharvana Bhava Bandaru1
1 Department of Clinical Pharmacy and Pharm.D., Vaagdevi College of Pharmacy, Warangal, Telangana, India
2 Department of Cardiology, Kakatiya Medical College, Mahatma Gandhi Memorial Hospital, Warangal, Telangana, India
|Date of Submission||16-Aug-2020|
|Date of Acceptance||21-Sep-2020|
|Date of Web Publication||23-Dec-2020|
Dr. Sheshagiri Sharvana Bhava Bandaru
Department of Clinical Pharmacy and Pharm.D., Vaagdevi College of Pharmacy, Hanamkonda, Warangal - 506 001, Telangana
Source of Support: None, Conflict of Interest: None
Objective: Our primary objective was to compare the efficacy of streptokinase (SK), tenecteplase, and reteplase by studying patients' electrocardiogram Electrocardiogram(ECG) pre and post thrombolysis. The secondary objectives were to assess chest pain relief using Numerical Pain Rating Scale score and also to compare the side effects (bleeding, hypotension, and anaphylaxis) of three drugs. Materials and Methods: This study is a multicentric, prospective, randomized, comparative study. This study was conducted on 150 patients of ST-elevation myocardial infarction admitted in the wards/ICCU- Intensive Coronary Care Unit, Department of Cardiology, Mahatma Gandhi Memorial Hospital and Rohini Superspeciality Hospital. They were selectively divided into three groups. Group A consisted of patients who received SK (50), Group B who received tenecteplase (50), and Group C who received reteplase (50). The study period was 6 months. The follow-up was done in all the patients during their inhospital stay. Results: Post thrombolysis, reteplase, tenecteplase, and SK led to mean ST-Segment reduction of 64.9 ± 19.77, 52.43 ± 34.57, and 46.97 ± 33.09, respectively. The comparison between the three drugs revealed a significant difference (P = 0.0103). Conclusion: This study concluded that reteplase is most efficacious in the resolution of ST-elevation and also safer than other thrombolytics used.
Keywords: Reteplase, ST-elevation myocardial infarction, streptokinase, tenecteplase, thrombolytics
|How to cite this article:|
Neela B, Gunreddy VR, Chandupatla MR, Eggadi V, Bhava Bandaru SS. Safety and efficacy of streptokinase, tenecteplase, and reteplase in patients diagnosed with ST-elevation myocardial infarction: A comparative study. J Indian coll cardiol 2020;10:134-8
|How to cite this URL:|
Neela B, Gunreddy VR, Chandupatla MR, Eggadi V, Bhava Bandaru SS. Safety and efficacy of streptokinase, tenecteplase, and reteplase in patients diagnosed with ST-elevation myocardial infarction: A comparative study. J Indian coll cardiol [serial online] 2020 [cited 2022 Dec 7];10:134-8. Available from: https://www.joicc.org/text.asp?2020/10/3/134/304380
| Introduction|| |
ST-elevation myocardial infarction (STEMI) is one of the challenging problems among acute coronary syndromes. STEMI is a clinical syndrome characterized by typical symptoms of myocardial ischemia associated with persistent electrocardiographic ST-elevation and subsequent release of myocardial necrotic biomarkers. The Universal Definition of Myocardial Infarction defined by the European Society of Cardiology/American College of Cardiology Foundation/American Heart Association (AHA)/World Heart Federation Task Force is defined as new ST-elevation at the point J in at least two contiguous leads of ≥1.5 mm (0.15 mV) in women or ≥2 mm (0.2 mV) in men in leads V2–V3 and/or of ≥1 mm (0.1 mV) in other contiguous chest leads or the limb leads, is characteristic of diagnostic ST-elevation in the absence of left ventricular (LV) hypertrophy or left bundle branch block (LBBB). Coronary artery disease (CAD) is the leading cause of mortality worldwide, and over 7.4 million people died due to CAD in 2015. Nearly three million STEMI cases are estimated to occur in India per year. Cardiovascular diseases are with the highest mortality rate in India accounting for about 21% of the deaths in 2010, with 10% of overall deaths occurring due to CAD.
The ACC/AHA 2013 guidelines for the management of STEMI suggest fibrinolytic therapy when there is an anticipated delay in performing primary PCI within 120 min of first medical contact and lists available fibrinolytic agents (tenecteplase [TNK-tPA], reteplase [rPA], alteplase, and streptokinase [SK]).
The hypothesis of our study was that reperfusion with new-generation fibrinolytics (TNK-tPA and rPA) will be effective than the SK. Besides this, the incidence of adverse events will be lesser with the new-generation thrombolytics.
| Materials and Methods|| |
Patients admitted to Mahatma Gandhi Memorial Hospital and Rohini Superspeciality Hospital, Warangal, with STEMI were enrolled for the study. The study was conducted according to widely accepted ethical principles guiding Human Research (Declaration of Helsinki). All the participants gave written informed consent, and the study has been approved (KIEC/KMC/NCT/NIS/2019/P36) by the Institutional Ethics Committee of Kakatiya Medical College, Warangal. It was a multicentric, prospective, randomized study.
This study was conducted on a total of 150 patients of STEMI admitted in the wards/ICCU, Department of Cardiology.
Patients presented with chest pain within 12 h, those diagnosed with STEMI, and patients treated with thrombolytic agents were included in the study.
Patients with any prior intracranial hemorrhage, known structural cerebral vascular lesions like arteriovenous malformation, severe uncontrolled hypertension (unresponsive to emergency therapy), known malignant intracranial neoplasm, ischemic stroke within 3 months except for acute ischemic stroke within 4.5 h, suspected aortic dissection, active bleeding or bleeding disorders, major trauma within 3 months, history of pacemaker implantation, intracranial or intraspinal surgery within 2 months, for SK- prior treatment within the previous 6 months, prior major surgery, peptic ulcer disease, anticoagulant therapy were excluded from this study.
To study the clinical outcomes of fibrinolysis, efficacy parameters such as mean ST-segment reduction, ST-elevation resolution of >50% on electrocardiogram (ECG), and chest pain relief (>50%) post thrombolysis were assessed. The complete resolution could be defined as the reduction in >70%, partial resolution as the reduction of 30%–70%, and no resolution as reduction of <30% after 180 min of post thrombolysis in ST. The pain was recorded with Numerical Pain Rating Scale (NPRS), an 11-point scale from 0 to 10 where 0 = no pain and 10 = the most intense pain imaginable, before and 90 min after fibrinolytic therapy. Safety parameters such as bleeding, hypotension, and anaphylaxis were also assessed with information from the patient case records.
The quantitative variables were expressed as mean ± standard deviation and compared within the groups using paired t-test/Wilcoxon test and between the groups by one-way ANOVA followed by Tukey's test. The qualitative variables were expressed as frequencies/percentages. P < 0.05 was considered statistically significant. GraphPad Prism version 8.3.1 was used for statistical analysis.
| Results|| |
A total of 150 patients of STEMI were included in the study. These were selectively divided into 3 groups of 50 each. Group A consisted of patients who received SK (50), Group B who received tenecteplase (50), and Group C who received reteplase (50).
The age distribution of the study population lies between 21 and 80 years. Majority of the patients in all the three groups are male [Table 1]. Among all the patients in three groups, 63 (42%) were smokers, 82 (54.66%) were alcoholics, 52 (34.6%) were both smokers and alcoholics, 64 (42.6%) had hypertension, 30 (20%) were diabetic patients, and 20 (13.33%) had both hypertension and diabetes mellitus.
All the patients ECG were assessed before and after thrombolytic therapy [Figure 1] for the calculation of mean values and to find the significant difference within groups and between the three drug groups, which yielded a significant value (P = 0.0103) [Table 2]. They were also evaluated for resolution of >50% ST-elevation and the results showed that rPA was more effective [Table 3].
|Figure 1: (a) Reteplase – inferior wall myocardial infarction. (b) Tenecteplase – anterolateral wall myocardial infarction. (c) Streptokinase – anterolateral wall myocardial infarction|
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All the patients were also evaluated for the relief in chest pain using NPRS score pre and post thrombolysis. A significant value was obtained within all three groups (P = 0.0001) and between the drug groups a P value (0.0283) was obtained, but in terms reduction in mean pain score and percent decrease, rPA was more effective [Table 4].
|Table 4: Efficacy of three thrombolytics (Numerical Pain Rating Scale score)|
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All the three groups were also evaluated for the safety of thrombolytic agents. The incidence of adverse effects in the rPA and TNK-tPA groups was equal (in about 4% of the patients), which reveals that they are superior to SK in terms of it [Table 5].
| Discussion|| |
Fibrinolytic therapy has become the mainstay of therapy for acute myocardial infarction. First-generation thrombolytics have clinical disadvantages such as low fibrin specificity, shorter half-life, and an enhanced risk of allergic reactions (especially for SK). The potential benefits have come from newer thrombolytic agents including rPA and TNK-tPA including high fibrin sensitivity, longer half-life, and improved plasminogen activator tolerance. However, these laboratory-mediated advantages may not translate into measurable and useful clinical results. Lanoteplase, a new thrombolytic drug, was withdrawn from development due to its increased risk of intracranial hemorrhage.,
Many findings in the last 10 years led to a reassessment of ST-elevation monitoring utility after STEMI. Schröder et al. showed that ST-segment resolution can predict accurately the risk of death and congestive heart failure in patients treated with fibrinolytic therapy. Resolution of ST-elevation is now being used with increasing frequency in the determination of prognosis early after fibrinolytic therapy and direct comparison of different reperfusion regimens.,
In patients around the world with sudden and severe STEMI, fibrinolytic remedy with SK and tissue plasminogen activators inclusive of TNK-tPA, rPA, and alteplase has a profound effect and the ability of these agents to obtain fast and efficient coronary reperfusion as systemic intravenous bolus or infusion has without a doubt modified the therapeutic approach., In a study done by Ranakishore et al., they concluded RTP (90%) = SK (90%) >TNK (86%) in terms of >50% resolution of ST-elevation and RTP (96.66) >SK (93.33) >TNK (83.33) in terms of >50% resolution of symptoms. Their study results were not in concordance with our study which concluded rPA (86%, 100%) >TNK-tPA (70%, 98%) >SK (52%, 94%) in terms of both efficacy parameters, respectively. The study was consistent with their study in terms of safety. In the study done by Uneeba Syed, 130 patients were treated with SK and the mean reduction in ST-elevation was noted as 58.53 ± 26.01. It was not concordant with our study which showed a mean reduction of 46.97 ± 33.09 in ST-elevation. In terms of NPRS score in a study conducted by Ramya et al., the mean score of pain was reduced tremendously after thrombolysis (SK) and those results were statistically significant (P < 0.0001) and were similar to our results obtained.
Bleeding is the main adverse effect of thrombolytics. In this research work, 4% of patients in the TNK-tPA group and 10% of patients in the SK group experienced bleeding. It was not consistent with a previous study done by Yazdi et al. In their study of 142 patients, 28.4% and 35.1% of patients treated with TNK-tPA and SK experienced bleeding, respectively.
In this research work, the incidence of adverse events in the rPA group was 8%, and resolution of 50% ST-elevation and resolution of symptoms were reported in 86% and 100% of patients, respectively. These results were not consistent with the previous study done by Singh et al. In their study, 228 patients were treated with rPA. The incidence of adverse events was 5.3%, and resolution of 50% ST-elevation and resolution of chest pain were reported in 90.50% and 95.4% of patients, respectively.
A postlicensure, observational, prescription event monitoring study of 2100 patients of STEMI was done by Iyengar et al. in 2009. In their study, 4.62% of TNK-tPA patients had experienced bleeding. It was concordant with our study results, in which 4% of patients had bleeding. A multicentric, observational, prescription event monitoring study of 7668 patients of STEMI was done by Iyengar et al. in 2017. In their study, 93.2% of patients had chest pain resolution after pharmacological fibrinolysis with TNK-tPA, but in our research work by a tiny fraction of 5%, 98% of patients had chest pain resolution.
A systemic review of randomized controlled trials comparing the clinical efficacy of newer (reteplase and tenecteplase) and older (alteplase and SK) thrombolytic agents was done by Dundar et al., and their study concluded that SK was associated with a higher incidence of allergic reactions, which also included anaphylaxis. It is concordant with our study which also showed that a patient treated with SK had an anaphylactic reaction, but the other two groups did not report any.
| Conclusion|| |
Our results suggest that reperfusion therapy with fibrin-specific fibrinolytics (rPA and TNK-tPA) is the optimum treatment regimen for patients. SK seems to be less effective in terms of safety and efficacy. Research on reteplase must be encouraged on a regular basis and make it available in all the emergency setups. Establishment of safety and efficacy of rPA and other thrombolytic agents and their comparative evidence helps the clinicians to choose an appropriate agent on an individual basis. More thrombolytic agents are needed to be designed, and more comparative shreds of evidence are to be established to reduce the morbidity and mortality of myocardial infarction patients. As a probable extension, two-dimensional echocardiography parameters such as ejection fraction and LV function can also be assessed. Patients' education on the disease and emergency condition, first-aid measures, and long-term follow-up after thrombolytic therapy may help the patient and researcher to work more effectively.
Findings derived from this study might not be directly inferable to the treatment strategy of all patients because the study was conducted in a sample size of 50 in each drug group and the clinical effectiveness of the drugs in long-term period could not be established due to noncompliance of patients for further follow-up.
We express our gratitude to the Institutional Ethics Committee of Kakatiya Medical College, Warangal, for permitting us to conduct the study. We also thank all the patients who took part in this research work.
Financial support and sponsorship
Conflicts of interest
There are no conflicts of interest.
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[Table 1], [Table 2], [Table 3], [Table 4], [Table 5]