EFFICIENCY ANALYSIS OF CONTRAST MATERIAL USE IN CT ANGIOGRAPHY EXAMINATIONS IN NORTH SUMATERA

Abstract

The escalating integration of Computed Tomography (CT) angiography in contemporary medical diagnostics, particularly for the intricate visualization of vascular structures, mandates a rigorous examination of resource stewardship, with a pronounced focus on the efficiency of iodinated contrast media utilization. While CT angiography undeniably provides exceptional anatomical detail, the substantial and frequently inconsistent volumes of contrast agents administered present considerable challenges concerning patient well-being—including the risk of contrast-induced nephropathy and hypersensitivity reactions—and exert significant financial pressures, especially within healthcare systems operating under resource constraints. Despite the existence of established international guidelines intended to standardize contrast administration, a significant lacuna persists in comprehensively understanding actual clinical practices and their consequential efficiency across the heterogeneous healthcare infrastructures prevalent in various regions, thereby underscoring an urgent imperative to meticulously analyze contrast media usage patterns and their multifaceted implications within the specific epidemiological and logistical context of North Sumatra, Indonesia. This study, therefore, aims to quantitatively analyze and critically evaluate the efficiency of contrast media utilization during CT angiography examinations performed across a diverse spectrum of healthcare facilities in North Sumatra, with the precise objective of determining optimal contrast volumes per examination, identifying the key factors precipitating observed variations in usage, and assessing the demonstrable correlation between administered contrast volume and achieved diagnostic image quality, all while strictly adhering to the foundational principles of dose optimization and evidence-based radiology. To achieve these aims, a robust retrospective, cross-sectional observational study design was meticulously implemented, wherein the medical records and associated imaging datasets of 500 patients undergoing CT angiography were systematically reviewed across a representative sample of tertiary and secondary referral hospitals within North Sumatra, with patient cases selected through a stratified random sampling methodology to ensure comprehensive representation of different facility types and patient demographic profiles. Data extraction, facilitated by a thoroughly validated data extraction form, encompassed critical variables such as patient characteristics, specific CT scanner parameters, the type and volume of contrast media administered, injection protocols employed, and the radiologist-reported diagnostic image quality scores. Subsequent statistical analysis involved a suite of descriptive statistics, alongside inferential tests including independent samples t-tests and ANOVA, further refined by multiple linear regression models to elucidate the determinants of contrast media volume and to rigorously assess its impact on image quality, with a predetermined significance level of p < 0.05. The empirical findings of this investigation revealed a pronounced and statistically significant variability in the mean volume of contrast media administered per CT angiography examination, with values ranging broadly from 80 mL to 150 mL across the participating institutions, culminating in an aggregate average volume of 115.5 ± 25.3 mL. Further analysis demonstrated that higher contrast volumes were significantly associated with the utilization of older generations of CT scanner technology (p < 0.01) and were found to be disproportionately more prevalent in examinations focusing on thoracic vasculature when contrasted with abdominal or cerebrovascular regions (p < 0.05). While a discernible positive correlation between increasing contrast volume and enhanced image quality was observed up to a certain threshold, the administration of volumes exceeding 120 mL did not yield statistically significant improvements in diagnostic image interpretability, as evidenced by a small effect size (Cohen's d < 0.2), strongly suggesting a potential for routine over-administration. Of particular concern, a notable subset of examinations, constituting approximately 15% of the total sample, utilized contrast volumes that exceeded established recommended guidelines without any concomitant, clinically demonstrable benefit, thereby indicating clear instances of suboptimal practice. In conclusion, this study definitively establishes that a significant degree of inefficiency pervades contrast media utilization within CT angiography procedures conducted in North Sumatra, characterized by substantial inter-institutional disparities and a prevalent inclination towards over-administration that is not counterbalanced by commensurate enhancements in diagnostic accuracy. These findings emphatically underscore the critical and immediate need for the systematic implementation of standardized contrast administration protocols, the provision of regular, targeted training programs for radiographers and radiologists, and the proactive adoption of advanced imaging techniques and workflow optimizations to effectively minimize contrast media usage, thereby concurrently improving patient safety outcomes and enhancing cost-effectiveness within the region's healthcare landscape. Future research endeavors should logically pivot towards prospective interventional studies designed to rigorously validate the efficacy of these standardized protocols and to further explore the potential of advanced image reconstruction techniques, such as iterative reconstruction, in achieving substantial reductions in contrast volume without compromising diagnostic utility.