ROLE OF INTRAVASCULAR ULTRASOUND (IVUS) IN EVALUATING OPTIMAL INFLATION AND SIZE OF STENTS AND BALLOON IN PATIENTS UNDERGOING PERCUTANEOUS CORONARY INTERVENTIONS (PCI)

Objective: To evaluate the size of balloon and stent and inflations given to patients undergoing PCI before and after IVUS. Design: A retrospective study. Place and duration of study: This retrospective study was conducted at department of catheterization laboratory National Institute of Cardiovascular Diseases (NICVD) Karachi from 1998 to 2001. Subjects and Methods: All patients who have undergone PCI in catheterization laboratory NICVD from 1998 to 2001 were included. These patients include those who have undergone IVUS in between year 2000 & 2001. Results: IVUS study and use of stents & balloon in four years showed that mean diameter of stent in males used increased from 3.05 mm to 3.13 mm and mean length reduced from 18.32 mm to 15.22 mm with inflations ranged from 9.30 atm to 13.4 atm. For Balloons mean diameter decreased from 2.7 mm to 2.6 mm and mean length reduced from 20.9 mm to 19.24 mm with inflations that increased from 5.04 atm to 6.4 atm. In females stent used with mean diameter that increased from 2.96 mm to 3.08 mm and mean mean length decreased from 18.33 mm to 15.47 mm and inflation increased from 9.33 atm to 12.69 atm. Balloon used with mean diameter that decreased from 2.9 mm to 2.6 mm with length that decreased from 20.8 mm to 19.04 mm and with inflations 6.20 atm to 5.80 atm. Conclusion: This study showed that IVUS demonstrated a significant increase in stent expansion after IVUS. Mean length of stent and balloon used decreased yearly. Mean diameter of stent used were increased while that of balloon decreased after IVUS.