A Case of Balloon Rupture During Coronary Angioplasty: Slow Flow Requiring Swift Action

We describe the case of a middle-aged man undergoing three-vessel coronary angioplasty due to unstable angina. Attempt to predilate a calcified lesion in the left circumflex artery with a semi-compliant balloon, inflated above the rated burst pressure, resulted in balloon rupture. Subsequently, the patient developed ST elevations and became hemodynamically unstable; slow flow in the index vessel was noted. The complication was managed with vasopressor and respiratory support, plus forceful injections of warm saline. Thrombolysis in myocardial infarction (TIMI)-3 flow was eventually restored, and the rest of the procedure was completed uneventfully. Following retrieval of the device, a longitudinal tear in the balloon was observed. This mode of rupture is considered to be safer, when compared to circumferential or pin-hole rupture. Rupture can occur when a balloon is aggressively inflated above nominal pressures and against calcific lesions. The ensuing micro- and macrovascular complications, including slow-flow, no-reflow, vessel dissection or perforation, and intramural hematoma, may induce myocardial ischemia and ultimately cardiogenic shock, malignant arrhythmias, and cardiac arrest. Management should be swift, and relies on supportive measures, depending on the degree of complications caused by the rupture.