Conduction: Difference between revisions

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On modern ECG machines, the QTc is given. However, the machines are not always capable in the correct determination of the end of the T wave. Therefore, it is important to check the QT time manually.
On modern ECG machines, the QTc is given. However, the machines are not always capable in the correct determination of the end of the T wave. Therefore, it is important to check the QT time manually.


[[Image:Surawicz.jpg|120px|thumb|right|Dr Surawicz, still active in November 2006, at age 89.]]
[[Image:Surawicz.jpg|120px|thumb|right|Dr Surawicz, founder of the tangent method, still active in November 2006, at age 89.]]
Although QT prolongation is potentially lethal, measurement of the QT interval by physicians is poor as different definitions of the end of the T wave exist.<cite>Viskin</cite> Most QT experts define the end of the T wave as the intersection of the steepest tangent line from the end of the T-wave with the base line of the ECG.<cite>Lepeschkin</cite> This leads to the following stepwise approach:
Although QT prolongation is potentially lethal, measurement of the QT interval by physicians is poor as different definitions of the end of the T wave exist.<cite>Viskin</cite> Most QT experts define the end of the T wave as the intersection of the steepest tangent line from the end of the T-wave with the base line of the ECG.<cite>Lepeschkin</cite> This leads to the following stepwise approach:


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