Echocardiographic Evaluation in Cardiac Resynchronization Therapy: A Single Center Experience

Introduction Heart failure develops as a result of dysfunction in the cardiac muscle, which impairs the heart's ability to pump blood effectively. For this reason, many studies have shown that cardiac resynchronization therapy (CRT) has significantly reduced symptoms and improved cardiac function in patients with heart failure. Echocardiography is crucial in assessing CRT response, as it helps differentiate between patients who benefit from CRT and those who do not by evaluating key parameters like left ventricular ejection fraction (LVEF), a critical parameter in determining CRT eligibility. However, few studies focus specifically on the effectiveness of echocardiography for assessing CRT response, with existing research limited by a lack of standardized protocols and inadequate predictive tools. Accordingly, this study aims to assess the role of echocardiography in evaluating the efficacy of CRT in patients with heart failure at King Faisal Cardiac Center. Methodology This was a retrospective analytical cohort study that included all adult patients diagnosed with heart failure and underwent CRT between January 2017 and December 2021 at King Faisal Cardiac Center, King Abdulaziz Medical City, Jeddah, Saudi Arabia. Data were obtained from the Cardiac Non-invasive Lab, which was selected for its essential diagnostic tools for comprehensive echocardiographic evaluation of CRT efficacy. Study subjects were over 18 years old, diagnosed with heart failure with reduced ejection fraction (LVEF <35%), underwent CRT, and had echocardiograms at baseline and at least six months post-therapy. The collected data were retrieved from electronic medical records (BestCare; ezCaretech Co., Ltd,Seoul, South Korea), including relevant demographics and echocardiographic parameters such as end-systolic volume (ESV), end-diastolic volume (EDV), and ejection fraction (EF). Statistical analysis, paired t-tests, and Shapiro-Wilk test to assess data normality were conducted to evaluate pre- and post-CRT changes, with significance set at P<0.05. Results A total of 53 heart failure patients met the inclusion and exclusion criteria. The results of the study indicate statistically significant differences in the mean EF before and after CRT increased from 29.09±6.52% to 33.3±10.69% (p-value=0.0014). The mean ESV decreased from 114.46±60.63 mL to 97.13±65.89 mL, demonstrating a clinically significant improvement (p=0.056), and the mean EDV decreased from 157.08±64.67 mL to 138.87±78.07 mL (p = 0.0158). Furthermore, the EF increased by 14.47%, and the ESV decreased by 15.14% after CRT. These findings indicate improvement in left ventricular function following CRT. Conclusion The study demonstrates significant improvements in echocardiographic parameters based on echocardiogram findings, particularly the outcomes of EF and ESV after CRT in patients with heart failure with reduced ejection fraction. These findings highlight the potential of CRT as an effective therapy and aid in detecting responders to treatment. Nevertheless, the study is limited by a relatively small sample size, exclusion of comorbidities, and short follow-up period. Therefore, further longitudinal studies with larger cohorts and consideration of comorbidities are recommended.