Complexity of the dynamic QT variability and RR variability in patients with acute anterior wall myocardial infarction: a novel technique using a non-linear method |
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Authors: | Nahshoni Eitan Strasberg Boris Adler Edgar Imbar Shula Sulkes Jacqueline Weizman Abraham |
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Institution: | The Gehah Mental Heallth Center, Geha Research Unit, Petah Tikva, Israel. ENahshoni@clalit.org.il |
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Abstract: | QT and RR intervals' fluctuations are implicated in the development of malignant arrhythmias. Recent research has quantified repolarization lability using stochastic and linear methods. However, QT-RR intervals are nonlinearly coupled. To this end, QT and RR intervals were extracted from twenty four patients with acute myocardial infarction (AMI) and 13 controls, and a measure of local dimensional complexity (pointwise correlation dimension, PD2) was calculated. PD2 of QT intervals was significantly higher for the patients than for controls (4.83 +/- 0.81 versus 3.40 +/- 0.76, P =.0001), and vice versa for RR intervals (2.51 +/- 0.62 versus 2.91 +/- 0.42, P =.028). The RR and QT measures of complexity were highly correlated only among controls (r = 0.769, P =.0021). Our results support the presence of autonomic abnormalities during infarction and might complement existing tools for assessment of increased risk for sudden death after AMI. |
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Keywords: | Acute myocardial infarction pointwise correlation dimension repolarization electrocardiography |
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