Acute Left Ventricular Dynamic Effects of Primary Percutaneous Coronary Intervention: From Occlusion to Reperfusion

Objectives died the left ventricular (LV) dynamic effects of primary percutaneous coronary intervention (PCI) for ST-segment elevation myocardial infarction (STEMI) by directly obtaining pressure–volume (PV) loops during the procedure. ound te myocardial infarction causes a decrease in LV compliance. The instantaneous effects of primary PCI on LV compliance are unknown. s died 15 consecutive patients (10 males, ages 59 ± 12 years), who presented with their first acute anterior STEMI within 6 h after onset of symptoms, and in whom coronary angiography revealed an occluded left anterior descending coronary artery. Before performing primary PCI, we inserted a pressure-conductance catheter in the LV to continuously obtain PV loops. s ately after successful reperfusion, significant improvements were observed in LV diastolic function, as indicated by an increased end-diastolic compliance with a 6.0 ± 2.8 mm Hg (p < 0.0001) downward shift of the compliance curve. There was a decrease in end-diastolic pressure of 24 ± 18% (p = 0.0002), in stiffness of 27 ± 18% (p = 0.0003), and in wall stress of 20 ± 24% (p = 0.004). Systolic function mainly showed an immediate improvement in apical contractility from 40 ± 17% to 54 ± 15% (p = 0.01). sions y PCI in anterior STEMI patients causes an immediate improvement in diastolic function, assessed by online PV loop measurements.