How to identify the worst abnormality in QT values (in Electrocardiogram)?

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Emad Mohammed said abdalla
30-March-2015

When identifying QT abnormality (in ECG) , i have5 modalities:1• New >450 msec2• New >480 msec3• New >500 msec4• Increase from baseline >30 msec5• Increase from baseline >60 msec what is the worst value if two of them accrues, for example:1 and5.

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Question ajoutée par Utilisateur supprimé
Date de publication: 2013/09/24

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Shubhadeep Sinha

par Shubhadeep Sinha , Vice President , Hetero Labs

The QT interval is most commonly measured in lead II for evaluation of serial ECGs, with leads I and V5 being comparable alternatives to lead II. Leads III, aVL and V1 are generally avoided for measurement of QT interval.

An "abnormal" QTc in males is a QTc above 450 ms, and in females, above 470 ms.

A Thorough QT (TQT) study is required to determine a drug's effect on the QT interval.

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par mahesh talele , ASSISTANT PROFESSOR PHYSICAL MEDICINE REHABILITATION , Medical College

QT is a complex of QRS and ST segment. each segment can vary in time and amplitude.

QT prolongates in bradycardia and shortens in tachycardia/ arrhthymias.

ST segment amplitude incresases with angina /Myocardial infarction.

QRS inversion may be sign of arrhytmias.

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