Early administration of intracoronary verapamil improves myocardial perfusion during percutaneous coronary interventions for acute myocardial infarction.
BACKGROUND
Intracoronary calcium-channel blockers administered in the event of no reflow during percutaneous coronary intervention (PCI) in acute myocardial infarction (AMI) have been shown to improve myocardial perfusion.


OBJECTIVE
To evaluate the effects of the administration of intracoronary verapamil before the occurrence of no reflow during direct PCI.


METHODS
Single-center, nonrandomized, prospective study with a retrospective control group.


METHODS
From September 2001 to December 2003, 50 consecutive patients with AMI were prospectively enrolled for intracoronary verapamil treatment. Intracoronary verapamil was administered immediately prior to balloon inflation and at short intervals during the procedure thereafter. Retrospectively, 50 consecutive AMI patients who had undergone direct PCI and had not received intracoronary calcium-channel blockers were enrolled as control subjects. Patients with cardiogenic shock or platelet glycoprotein IIb/IIIa inhibitor were excluded. Thrombolysis in Myocardial Infarction (TIMI) flow grade, corrected TIMI frame count (CTFC), and TIMI myocardial perfusion grade (TMPG) were assessed prior to and following PCI by two independent cardiologists blinded to the procedures.


RESULTS
The two groups had similar baseline and post-procedural angiographic characteristics, although the patients who been administered verapamil received more stent implantations than the control subjects (84% vs 60%, p = 0.008). Post-procedural TIMI flow < 3 (odds ratio [OR], 0.39; 95% confidence interval [CI], 0.12 to 1.30; p = 0.18) and TMPG (OR, 1.24; 95% CI, 0.46 to 3.34; p = 0.68) were not associated with the implantation of the stents. There were no significant difference in post-PCI TIMI flow (p = 0.68) and CTFC (p = 0.36) between patients treated with verapamil and the control subjects. Post-PCI TMPG was significantly better in patients treated with intracoronary verapamil (p = 0.003). Forty-two percent of the patients treated with verapamil were found to have TMPG-3, while only 14% of the control subjects were found to have the same degree of TMPG (p = 0.004). Treatment with intracoronary verapamil (OR, 0.26; 95% CI, 0.12 to 0.58; p = 0.001) and pre-PCI TIMI flow (OR, 0.54; 95% CI, 0.35 to 0.84; p = 0.006) were found by multiple logistic regression to be independent predictors of TMPG.


CONCLUSIONS
Early administration of intracoronary verapamil during direct PCI improves post-procedural myocardial perfusion, as evaluated by TMPG.
Hang
Chi-Ling
CL
Section of Cardiology, Department of Internal Medicine, Chang Gung Memorial Hospital, 123 Ta-Pei Rd, Niao-Sung Hsiang, Kaohsiung Hsien 833, Taiwan, ROC.
Wang
Cha-Ping
CP
Yip
Hon-Kan
HK
Yang
Cheng-Hsu
CH
Guo
G Bih-Fang
GB
Wu
Chiung-Jen
CJ
Chen
Shyh-Ming
SM
D000368:Aged; D015906:Angioplasty, Balloon, Coronary; D001783:Blood Flow Velocity; D002121:Calcium Channel Blockers / Q000008:administration & dosage / Q000627:therapeutic use; D002404:Catheterization; D017023:Coronary Angiography; D003331:Coronary Vessels; D005260:Female; D006801:Humans; D007269:Injections, Intra-Arterial; D008297:Male; D008875:Middle Aged; D009203:Myocardial Infarction / Q000000981:diagnostic imaging / Q000628:therapy*; D012189:Retrospective Studies; D016896:Treatment Outcome; D014700:Verapamil / Q000008:administration & dosage / Q000627:therapeutic use*
D002121:Calcium Channel Blockers; D014700:Verapamil