For diagnosis and treatment, patients with a range of cardiovascular illnesses need cardiac catheterization, a minimally invasive procedure that includes inserting a catheter into the heart or coronary arteries and injecting radio-opaque contrast to identify and perhaps cure a blockage. The purpose of this study is to assess the prevalence of arrhythmia and renal injury among cardiac catheterization patients. This cross-sectional research was conducted in K.S.A from July to November. Demographic information, a history of cardiac catheterization, and whether or not arrhythmia or kidney damage exists were gathered in the survey, as well as the degree of awareness among cardiac patients regarding the severity of these complications. The study included 1194 patients; 54.5% of them were males and 45.5% were females. 28.6% of participants aged between 51- 60 years old. 551 (46.1%) of participants had side effects, 65.3% of them had arrhythmia, 10.2% had renal failure, 12% had nephritis, 29.4% reported that their kidneys were affected, and 6.2% had renal stones. 37.9% of participants had a heart operation following cardiac catheterization, while 13.5% had a kidney operation after cardiac catheterization. In conclusion, the study found a high incidence of arrhythmia and kidney damage among patients with cardiac catheterization in K.S.A. The dangers and consequences related to cardiac catheterization have greatly decreased as a consequence of the introduction of tiny catheters, increasing utilization of the trans-radial method, and better operator technical abilities. However, each patient should be managed depending on general condition along with associated co-morbidities.