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| Predicate | Object |
|---|---|
| rdf:type | |
| lifeskim:mentions | |
| pubmed:issue |
2
|
| pubmed:dateCreated |
1995-10-4
|
| pubmed:abstractText |
To evaluate the presence and clinical significance of electrical alternans during PTCA, intracoronary electrocardiography (ic-ECG) was performed in 65 consecutive lesions. ST-T alternans, defined as a beat-to-beat difference in the ST elevation > or = 1 mm, was present in five lesions (7.7%), all in the proximal left anterior descending (LAD) coronary artery. The phenomenon was seen only after 130 sec (mean 174 +/- 57) of balloon inflation. Only two of the five showed ST-T alternans simultaneously on both surface and ic-ECG. One of five patients had premature ventricular contractions following ST-T alternans. Three of these five lesions required a second balloon inflation with duration of > or = 300 sec; there was no ST-T alternans on the second inflation in any of these lesions. We conclude: (1) the detection of ST-T alternans during PTCA is enhanced by use of ic-ECG, (2) electrical alternans during PTCA was seen only in proximal LAD lesions, implicating a large amount of ischemic myocardium as a requisite for the phenomenon, (3) electrical alternans is not immediate, requiring a certain duration of balloon occlusion and hence ischemia to occur, and (4) the absence of ST-T alternans during second balloon inflations suggests ischemic preconditioning may abolish this phenomenon.
|
| pubmed:language |
eng
|
| pubmed:journal | |
| pubmed:citationSubset |
IM
|
| pubmed:status |
MEDLINE
|
| pubmed:month |
Jun
|
| pubmed:issn |
0098-6569
|
| pubmed:author | |
| pubmed:issnType |
Print
|
| pubmed:volume |
35
|
| pubmed:owner |
NLM
|
| pubmed:authorsComplete |
Y
|
| pubmed:pagination |
121-6
|
| pubmed:dateRevised |
2010-11-18
|
| pubmed:meshHeading |
pubmed-meshheading:7656303-Adult,
pubmed-meshheading:7656303-Aged,
pubmed-meshheading:7656303-Aged, 80 and over,
pubmed-meshheading:7656303-Angioplasty, Balloon, Coronary,
pubmed-meshheading:7656303-Coronary Vessels,
pubmed-meshheading:7656303-Electrocardiography,
pubmed-meshheading:7656303-Electrophysiology,
pubmed-meshheading:7656303-Female,
pubmed-meshheading:7656303-Humans,
pubmed-meshheading:7656303-Male,
pubmed-meshheading:7656303-Middle Aged,
pubmed-meshheading:7656303-Monitoring, Intraoperative,
pubmed-meshheading:7656303-Myocardial Ischemia,
pubmed-meshheading:7656303-Sensitivity and Specificity
|
| pubmed:year |
1995
|
| pubmed:articleTitle |
Intracoronary ST-T alternans during coronary balloon angioplasty.
|
| pubmed:affiliation |
Department of Medicine, State University of New York, Health Science Center, Brooklyn 11203, USA.
|
| pubmed:publicationType |
Journal Article
|