Ischemic J wave before and post percutaneous coronary intervention in patients with coronary artery disease / 中华心血管病杂志

<p><b>OBJECTIVE</b>To explore the change of electrocardiographic ischemic J wave in patients with coronary heart disease (CHD) underwent percutaneous coronary intervention (PCI).</p><p><b>METHODS</b>CHD patients (CHD, n = 162) underwent PCI in the hospital were divided into unstable angina pectoris (angina pectoris group, n = 108) and acute myocardial infarction group (AMI group, n = 54), 12-lead electrocardiogram was recorded within 24 hours before and after PCI. Patients were further grouped into left anterior descending artery group and right or circumflex coronary artery stenosis group. The incidence, amplitude and time course of J waves were measured and analyzed.</p><p><b>RESULTS</b>(1) The highest incidence of J wave appeared in II, III, aVF leads pre- and post-PCI in CHD groups (33.95%, 22.84%, 26.54% and 30.86%, 19.75%, 23.46%). Higher incidence of J wave in AMI group was evidenced in V(5), II, aVF, III, V(3) leads before PCI (33.33%, 27.78%, 16.67%, 12.96%, 11.11%) and in V(5), II, aVF, aVL, III leads after PCI (22.22%, 22.22%, 14.81%, 12.96%, 9.26%). (2) Before PCI, higher incidence of J wave was found in V(5), V(6) leads (25.78%) in left anterior descending artery group and in II, III, aVF leads (35.37%) in right or circumflex coronary artery stenosis group. After PCI, the higher incidence of J wave in left anterior descending artery group and right or circumflex coronary artery stenosis group was evidenced in II, III, aVF leads (21.09% and 35.37%, respectively). (3) The ischemic J wave' amplitude and time course in II, III, aVF, V(3), V(4) leads were significantly reduced post PCI in CHD patients.</p><p><b>CONCLUSIONS</b>Higher incidence of J wave was found in II, III, aVF in CHD patients. PCI is associated with reduced amplitude and time course of J wave suggesting PCI could improve ischemic J waves in CHD patients.</p>

Ischemic J wave changes before and post percutaneous coronary intervention in patients with coronary artery disease / 中华心血管病杂志

<p><b>OBJECTIVE</b>To observe the incidence of ischemic J wave before and post percutaneous coronary intervention (PCI) in patients with coronary heart disease (CHD).</p><p><b>METHODS</b>CHD patients (n = 117) underwent percutaneous coronary intervention (PCI) in Shanxi cardiovascular hospital were included in this study. The 12-lead ECGs were recorded within 24 hours before and after PCI. The ischemic J waves of five lead-groups (II, III, aVF group: V(1), V(2) group; V(3), V(4) group; V(5), V(6) group;I, aVL group) were analyzed and the number of lead-groups with J waves (0 - 5) were obtained in each patient. According to time course or wave amplitude, J waves were classified into three grades: small (time course between 0.02 - 0.03 s or wave amplitude between 0.05 - 0.09 mV), large (time course between 0.04 - 0.06 s or wave amplitude between 0.10 - 0.20 mV) and enormous (time course > 0.06 s or wave amplitude > 0.20 mV) J waves.</p><p><b>RESULTS</b>The number of lead-groups with ischemic J waves (0 - 5) in each patient was similar between pre and post PCI in the 117 patients (χ(2) = 6.23, P = 0.285). The numbers of small, large and enormous J waves were 157, 36 and 9 respectively before PCI and 163, 20 and 5 after PCI. The incidence of small J waves increased (77.72% vs. 86.70%) while large and enormous J waves decreased (17.82%, 4.46% vs. 10.64%, 2.66%) post PCI (χ(2) = 5.28, P < 0.05).</p><p><b>CONCLUSIONS</b>The numbers of lead-groups with ischemic J waves were similar before and post PCI. However, the amplitude of ischemic J waves decreased after PCI suggesting PCI could improve ischemic J waves in CHD patients.</p>