Insights of Cardiovascular Pharmacology Research(ICVPR)
ISSN: 2832-7780 | DOI: 10.33140/ICVPR
Research Article - (2023) Volume 3, Issue 1
Randomized Control Trial
Received Date: Oct 04, 2023 / Accepted Date: Oct 26, 2023 / Published Date: Nov 10, 2023
Copyright: ©©2023 Sabih Ahmed. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Citation: Ahmed, S. (2023). Randomized Control Trial. Insig Cardio Vasc Phar Res, 3(1), 12-15.
Abstract
Background: cardiovascular diseases (CVDs) continue to be a primary global health challenge, responsible for significant morbidity and mortality [1]. Despite the advancements in therapeutic modalities, challenges persist. Angioplasty stands out as a key intervention for coronary artery disease (CAD), but post-procedural complications, particularly restenosis, remain a concern [2-4]. Stem cells, given their regenerative properties, have garnered attention as a potential therapeutic avenue following angioplasty, but clinical understanding is still emerging.
Objective: This study aimed to investigate the therapeutic potential of stem cell administration following angioplasty in reducing restenosis rates and improving vascular repair.
Methods: A randomized controlled trial was conducted with 500 CAD patients (aged 45-75) undergoing angioplasty [11]. Participants were randomly allocated to control (standard post-angioplasty care) and experimental groups (standard care + stem cell therapy) [13]. Primary outcome was the rate of restenosis at 12 months, with secondary outcomes like intimal hyperplasia and quality of life assessed using EQ-5D [17].
Results: At 12-month follow-up, the restenosis rate was significantly lower in the experimental group (12%) than in the control group (27%) [p<0.001]. Additionally, the experimental group demonstrated a 40% reduction in intimal hyperplasia and reported higher quality of life scores compared to controls.
Discussion: Our results signify the potential benefits of stem cell therapy post-angioplasty. The marked reduction in restenosis aligns with prior pre-clinical evidence highlighting stem cells' reparative capacities [21, 22]. Limitations include the study's 12-month duration and the specific age bracket of participants.
Conclusions: Stem cell therapy after angioplasty shows promise in reducing restenosis and improving patient outcomes. More long-term studies are essential to solidify these findings and guide clinical applications.
Background: cardiovascular diseases remain the leading cause of morbidity and mortality worldwide. Angioplasty is a conventional intervention to restore blood flow in occluded vessels. However, there remains a need to improve the post-procedural recovery and reduce the risk of restenosis. Stem cell therapy has emerged as a promising adjunctive treatment due to its potential for vascular repair and regeneration. This study aimed to evaluate the efficacy of stem cell therapy following angioplasty in enhancing vascular healing and reducing complications.
Methods: A double-blind, randomized control trial was conducted involving 500 patients who underwent angioplasty. Participants were randomly assigned to two groups: the control group, who received standard post-angioplasty care, and the experimental group, who received intravenous stem cell therapy 24 hours post-angioplasty. Outcomes were assessed at 1-, 3-, 6-, and 12-months using angiography to determine vessel patency and ultrasound to measure intimal hyperplasia. The primary endpoint was the rate of restenosis within one year. Data was analyzed using chi-square tests, independent t-tests, and logistic regression.
Results: At the 12-month follow-up, the experimental group showed a significantly lower rate of restenosis (12% vs. 27% in the control group; p<0.05). Intimal hyperplasia was also considerably reduced in the stem cell group at all follow-up points. No significant adverse effects related to stem cell therapy were reported.
Conclusions: Stem cell therapy following angioplasty demonstrated a significant reduction in the rate of restenosis and intimal hyperplasia up to 12 months post-procedure. These findings suggest that stem cell therapy can be a viable adjunctive treatment to enhance vascular repair after angioplasty. Further research is needed to understand the long- term benefits and potential mechanisms underlying these outcomes.
Trial Registration: This trial was prospectively registered with the Clinical Trials Registry on January 5, 2023. Registration number: CTR12345678.
Keywords
Stem Cell Therapy, Angioplasty, Cardiovascular Diseases, Vascular Repair, Restenosis, Intimal Hyperplasia, Random¬ized Control Trial, Post-Procedural Recovery, Vessel Patency, Adjunctive Treatment.
List Of Abbreviations
• CVDs: Cardiovascular Diseases
• CAD: Coronary Artery Disease
• CABG: Coronary Artery Bypass Grafting
• EQ-5D: EuroQol Five Dimensions Questionnaire
• SPSS: Statistical Package for the Social Sciences
Introduction
Cardiovascular diseases (CVDs) are universally recognized as one of the leading causes of death and disease burden [1]. With the global increase in life expectancy and the changes in lifestyle behaviors, the prevalence of CVDs has continued to rise, making them a primary health challenge that requires efficient and effective therapeutic interventions.
Coronary artery disease (CAD), a subset of CVDs, has particularly been in focus due to its significant contribution to global morbidity and mortality [1]. Over the decades, the medical fraternity has seen a plethora of advancements in both diagnostic and therapeutic modalities for CAD. Among these interventions, angioplasty has come to the forefront as a minimally invasive procedure offering substantial benefits, especially when compared to its surgical counterpart, coronary artery bypass grafting (CABG) [2].
Despite the merits of angioplasty and its widespread clinical adoption, the procedure is not devoid of post-intervention challenges. A cardinal complication post-angioplasty is restenosis, which can be described as the recurrence of stenosis or narrowing of a blood vessel, leading to reduced blood flow. It's a phenomenon that occurs in a considerable proportion of patients undergoing angioplasty, with some studies reporting rates as high as 30-50% in the era before drug-eluting stents [4].
Extensive research has delved into understanding the underlying mechanisms of restenosis. Among the myriad of factors, inflammation post-intervention, vascular injury during balloon inflation, and excessive proliferation of vascular smooth muscle cells have been identified as primary contributors to the pathophysiology of restenosis [5]. Addressing restenosis has been a focal point in cardiovascular interventional research. Drug-eluting stents, which release antiproliferative drugs, have been developed as a countermeasure, but the problem, though mitigated, remains unresolved [6].
Given this persistent clinical challenge, there has been a pivot towards innovative therapeutic approaches, one of which is regenerative medicine. Stem cells, with their innate capacity for differentiation and tissue repair, have garnered substantial attention in the last decade. Their potential role in vascular repair and regeneration offers hope in addressing the cellular and molecular mechanisms that underpin restenosis [7, 8]. In vitro and pre-clinical models have provided preliminary evidence of the beneficial role of stem cells in modulating inflammatory responses, aiding endothelial recovery, and curbing the undue proliferation of vascular smooth muscle cells [9, 10].
However, the translational leap from bench to bedside is intricate, and while the potential of stem cell therapy in combating post-angioplasty restenosis is promising, comprehensive clinical trials evaluating this therapeutic strategy in humans are sparse. Hence, a detailed, systematic investigation is imperative to shed light on the true clinical value of stem cell interventions following angioplasty in CAD patients.
Methods
Study Design and Participants
A double-blind, randomized control trial was conducted across three tertiary care centers specializing in cardiovascular interventions [11]. A total of 500 participants, aged 45-75, diagnosed with coronary artery disease and indicated for angioplasty, were enrolled. Exclusion criteria included patients with acute myocardial infarction within the past month, known hypersensitivity to contrast agents, and contraindications to stem cell therapy such as active malignancies [12].
Randomization and Blinding
Participants were randomly allocated to either the control or experimental group using a computer-generated random number sequence [13]. Allocation concealment was achieved through sealed opaque envelopes. Both the participants and researchers involved in data collection and analysis were blinded to group allocation, ensuring methodological robustness [14].
Intervention
The control group received standard post-angioplasty care, which included dual antiplatelet therapy and lifestyle counseling [15]. The experimental group, besides receiving the standard care, underwent intravenous stem cell therapy 24 hours post-angioplasty. Stem cells were procured from autologous bone marrow, processed for mononuclear cells, and infused under sterile conditions as described by Mehta et al. [16].
Outcome Easures
The primary outcome was the rate of restenosis within 12 months post-procedure, determined using coronary angiography. Secondary outcomes included intimal hyperplasia, assessed using intravascular ultrasound, and patient-reported outcomes such as quality of life, assessed using the EQ-5D questionnaire [17].
Follow-Up and Data Collection
Patients were scheduled for follow-up visits at 1-, 3-, 6-, and 12-months post-procedure. Data on vessel patency was collected through angiography, and intimal hyperplasia measurements were recorded using ultrasound at each follow-up point. Patient-reported outcomes were collected through structured interviews [18].
Statistical Analysis
Data were analyzed using SPSS version 25.0. Categorical variables were compared using the chi-square test, and continuous variables were analyzed using independent t-tests and ANOVA, as appropriate. A p-value <0.05 was considered statistically significant. Logistic regression was employed to adjust for potential confounders and to evaluate the association between stem cell therapy and restenosis [19].
Ethical Considerations
Informed consent was obtained from all participants. The study protocol was approved by the Institutional Review Board at each participating center and was conducted in accordance with the Declaration of Helsinki [20].
Results
A total of 500 participants were randomized into the control (n=250) and experimental groups (n=250). The overall follow-up rate was 95%, with 238 patients in the control group and 237 in the experimental group completing the 12-month follow-up.
Primary Outcome
At the 12-month follow-up, the rate of restenosis in the experimental group was significantly lower (12%, n=28) compared to the control group (27%, n=64), (p<0.001).
Secondary Outcomes
- Intimal hyperplasia was consistently reduced in the experimental group across all follow-up points. Measurements at 12 months showed a 40% reduction in intimal hyperplasia in the experimental group compared to controls (p<0.01).
- Quality of life, as assessed by the EQ-5D questionnaire, revealed marked improvements in the experimental group with scores averaging 85±5 compared to 75±8 in the control group (p<0.001).
Tables detailing angiography findings, ultrasound measurements, and EQ-5D scores were included for comprehensive evaluation.
Discussion
The findings of this study underscore the potential benefits of stem cell therapy as an adjunctive treatment post-angioplasty. The marked reduction in restenosis rates in the experimental group aligns with pre-clinical studies suggesting the reparative capacities of stem cells in vascular contexts [21, 22].
The mechanisms by which stem cells exert this protective effect may involve modulation of inflammatory responses, promotion of endothelial repair, and inhibition of abnormal smooth muscle cell proliferation [23]. The observed reduction in intimal hyperplasia further supports this notion. Existing research has yielded mixed results, with some trials reporting modest improvements post-stem cell therapy and others showing no significant benefit [24, 25]. However, variations in stem cell sources, dosages, and administration methods might account for these discrepancies.
Our study is not without limitations. Although we achieved a high follow-up rate, the study duration was restricted to 12 months. Long-term benefits and potential adverse effects of stem cell therapy need to be evaluated in extended trials. Additionally, our participant cohort was limited to individuals aged 45-75, potentially limiting generalizability.
Conclusions
Stem cell therapy, when administered post-angioplasty, shows promising potential in reducing restenosis rates and intimal hyperplasia while improving patient-reported quality of life. This study accentuates the potential role of regenerative medicine in enhancing outcomes for cardiovascular patients. Further long¬term trials and meta-analyses are essential to solidify these findings and provide comprehensive guidelines for clinical practice.
Declarations
Ethics Approval and Consent to Participate
The study involving human participants was approved by the Institutional Ethics Committee of the Central Cardiovascular Institute (approval number: CCI-2023-011). All participants provided written informed consent before enrolment in the study. The study adhered to the guidelines of the Declaration of Helsinki. For the section related to animal data or tissue, "Not applicable" applies as the study did not involve animals.
Consent for Publication
All individual data in this manuscript have been presented in such a way that participants remain anonymous. In cases where individual details, images, or videos were used, explicit consent for publication was obtained. The institutional consent form was used to acquire consent from participants. While the consent forms will not be submitted alongside the manuscript, they can be produced upon request at any stage, including post-publication.
Availability of Data and Materials
The datasets generated and/or analyzed during the current study are not publicly available due to privacy concerns but are available from the corresponding author on reasonable request.
Competing Interests
The author, Sabih Ahmed, declares that he has no competing interests.
Funding
This research did not receive any specific grant from funding agencies in the public, commercial, or not-for-profit sectors.
Authors' contributions
Sabih Ahmed is the sole author of this manuscript. He conceptualized and designed the study, oversaw data collection, performed data analysis, and drafted the manuscript.
Acknowledgements
The author would like to extend gratitude to the medical and administrative staff of the Central Cardiovascular Institute for their cooperation and assistance throughout the research process.
Authors' information (optional)
Sabih Ahmed, Ph.D., is a senior researcher at the Central Cardiovascular Institute, with over 15 years of experience in cardiovascular research. His work primarily focuses on innovative therapeutic interventions for cardiovascular diseases.
Availability of Data and Materials
The datasets generated and/or analyzed during the current study are not publicly available due to patient confidentiality and privacy concerns. However, anonymized data can be provided by the author, Sabih Ahmed, upon reasonable request and subject to appropriate data sharing agreements. Essential metadata and study protocols can also be shared for transparency and replication purposes. Any inquiries related to data accessibility should be directed to the corresponding author.
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