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Early repolarization with horizontal ST segment may be associated with aborted sudden cardiac arrest: a retrospective case control study.

Kim SH, Kim do Y, Kim HJ, Jung SM, Han SW, Suh SY, Ryu KH - BMC Cardiovasc Disord (2012)

Bottom Line: An ST-segment pattern of <0.1 mV within 100 ms after the J point was defined as a horizontal ST segment.The corrected QTc was not significantly different between the SCA and control groups (432.7 ± 37.96 vs. 420.4 ± 26.3, respectively; p = 0.089).The prevalence of ERP with a horizontal ST segment was higher in patients with aborted SCA than in matched controls.

View Article: PubMed Central - HTML - PubMed

Affiliation: Department of Internal Medicine, Konkuk University School of Medicine, Konkuk, South Korea.

ABSTRACT

Background: Risk stratification of the early repolarization pattern (ERP) is needed to identify malignant early repolarization. J-point elevation with a horizontal ST segment was recently suggested as a malignant feature of the ERP. In this study, the prevalence of the ERP with a horizontal ST segment was examined among survivors of sudden cardiac arrest (SCA) without structural heart disease to evaluate the value of ST-segment morphology in risk stratification of the ERP.

Methods: We reviewed the data of 83 survivors of SCA who were admitted from August 2005 to August 2010. Among them, 25 subjects without structural heart disease were included. The control group comprised 60 healthy subjects who visited our health promotion center; all control subjects were matched for age, sex, and underlying disease (diabetes mellitus, hypertension). Early repolarization was defined as an elevation of the J point of at least 0.1 mV above the baseline in at least two continuous inferior or lateral leads that manifested as QRS slurring or notching. An ST-segment pattern of <0.1 mV within 100 ms after the J point was defined as a horizontal ST segment.

Results: The SCA group included 17 men (64%) with a mean age of 49.7 ± 14.5 years. The corrected QTc was not significantly different between the SCA and control groups (432.7 ± 37.96 vs. 420.4 ± 26.3, respectively; p = 0.089). The prevalence of ERP was not statistically different between the SCA and control groups (5/25, 20% vs. 4/60, 6.7%, respectively; p = 0.116). The prevalence of early repolarization with a horizontal ST segment was more frequent in the SCA than in the control group (20% vs. 3.3%, respectively; p = 0.021). Four SCA subjects (16%) and one control subject (1.7%) had a J-point elevation of >2 mm (p = 0.025). Four SCA subjects (16%) and one (1.7%) control subject had an ERP in the inferior lead (p = 0.025).

Conclusion: The prevalence of ERP with a horizontal ST segment was higher in patients with aborted SCA than in matched controls. This result suggests that ST morphology has value in the recognition of malignant early repolarization.

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Related in: MedlinePlus

The definition of early repolarization patterns. (A) Early repolarization: defined as a QRS-ST junction elevation of at least 1 mm (0.1 mV) above the baseline in at least two continuous inferior or lateral leads that manifests as QRS slurring or notching (thick arrow). (B) A horizontal ST segment was defined as a J-point elevation of <0.1 mV within 100 ms after the J point (46-yr-old man in SCA group). (C) An ascending ST segment was defined as a J-point elevation of >0.1 mV within 100 ms after the J point (44-yr-old man in control group).
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Figure 1: The definition of early repolarization patterns. (A) Early repolarization: defined as a QRS-ST junction elevation of at least 1 mm (0.1 mV) above the baseline in at least two continuous inferior or lateral leads that manifests as QRS slurring or notching (thick arrow). (B) A horizontal ST segment was defined as a J-point elevation of <0.1 mV within 100 ms after the J point (46-yr-old man in SCA group). (C) An ascending ST segment was defined as a J-point elevation of >0.1 mV within 100 ms after the J point (44-yr-old man in control group).

Mentions: ECGs were evaluated in random order by two physicians who were blinded to the subject grouping. The presence of ERP was checked. Early repolarization was defined as a QRS-ST junction elevation of at least 1 mm (0.1 mV) above the baseline in at least two continuous inferior or lateral leads that manifested as QRS slurring or notching (Figure 1A). The amplitude of the J-point elevation was measured, and a J-point elevation of >0.2 mV was defined as a large-amplitude J-point elevation.


Early repolarization with horizontal ST segment may be associated with aborted sudden cardiac arrest: a retrospective case control study.

Kim SH, Kim do Y, Kim HJ, Jung SM, Han SW, Suh SY, Ryu KH - BMC Cardiovasc Disord (2012)

The definition of early repolarization patterns. (A) Early repolarization: defined as a QRS-ST junction elevation of at least 1 mm (0.1 mV) above the baseline in at least two continuous inferior or lateral leads that manifests as QRS slurring or notching (thick arrow). (B) A horizontal ST segment was defined as a J-point elevation of <0.1 mV within 100 ms after the J point (46-yr-old man in SCA group). (C) An ascending ST segment was defined as a J-point elevation of >0.1 mV within 100 ms after the J point (44-yr-old man in control group).
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3585746&req=5

Figure 1: The definition of early repolarization patterns. (A) Early repolarization: defined as a QRS-ST junction elevation of at least 1 mm (0.1 mV) above the baseline in at least two continuous inferior or lateral leads that manifests as QRS slurring or notching (thick arrow). (B) A horizontal ST segment was defined as a J-point elevation of <0.1 mV within 100 ms after the J point (46-yr-old man in SCA group). (C) An ascending ST segment was defined as a J-point elevation of >0.1 mV within 100 ms after the J point (44-yr-old man in control group).
Mentions: ECGs were evaluated in random order by two physicians who were blinded to the subject grouping. The presence of ERP was checked. Early repolarization was defined as a QRS-ST junction elevation of at least 1 mm (0.1 mV) above the baseline in at least two continuous inferior or lateral leads that manifested as QRS slurring or notching (Figure 1A). The amplitude of the J-point elevation was measured, and a J-point elevation of >0.2 mV was defined as a large-amplitude J-point elevation.

Bottom Line: An ST-segment pattern of <0.1 mV within 100 ms after the J point was defined as a horizontal ST segment.The corrected QTc was not significantly different between the SCA and control groups (432.7 ± 37.96 vs. 420.4 ± 26.3, respectively; p = 0.089).The prevalence of ERP with a horizontal ST segment was higher in patients with aborted SCA than in matched controls.

View Article: PubMed Central - HTML - PubMed

Affiliation: Department of Internal Medicine, Konkuk University School of Medicine, Konkuk, South Korea.

ABSTRACT

Background: Risk stratification of the early repolarization pattern (ERP) is needed to identify malignant early repolarization. J-point elevation with a horizontal ST segment was recently suggested as a malignant feature of the ERP. In this study, the prevalence of the ERP with a horizontal ST segment was examined among survivors of sudden cardiac arrest (SCA) without structural heart disease to evaluate the value of ST-segment morphology in risk stratification of the ERP.

Methods: We reviewed the data of 83 survivors of SCA who were admitted from August 2005 to August 2010. Among them, 25 subjects without structural heart disease were included. The control group comprised 60 healthy subjects who visited our health promotion center; all control subjects were matched for age, sex, and underlying disease (diabetes mellitus, hypertension). Early repolarization was defined as an elevation of the J point of at least 0.1 mV above the baseline in at least two continuous inferior or lateral leads that manifested as QRS slurring or notching. An ST-segment pattern of <0.1 mV within 100 ms after the J point was defined as a horizontal ST segment.

Results: The SCA group included 17 men (64%) with a mean age of 49.7 ± 14.5 years. The corrected QTc was not significantly different between the SCA and control groups (432.7 ± 37.96 vs. 420.4 ± 26.3, respectively; p = 0.089). The prevalence of ERP was not statistically different between the SCA and control groups (5/25, 20% vs. 4/60, 6.7%, respectively; p = 0.116). The prevalence of early repolarization with a horizontal ST segment was more frequent in the SCA than in the control group (20% vs. 3.3%, respectively; p = 0.021). Four SCA subjects (16%) and one control subject (1.7%) had a J-point elevation of >2 mm (p = 0.025). Four SCA subjects (16%) and one (1.7%) control subject had an ERP in the inferior lead (p = 0.025).

Conclusion: The prevalence of ERP with a horizontal ST segment was higher in patients with aborted SCA than in matched controls. This result suggests that ST morphology has value in the recognition of malignant early repolarization.

Show MeSH
Related in: MedlinePlus