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QT interval
Causes for poor ECG tracing can be from the patient moving or interferences from electrical appliances in the room: cell phones, a lamp plug in etc
Paperclips
yes
Electrical Activity of the Heart
the time between the two R waves in ECG
The RR interval of ECG vary during normal respiration because of the sinus arrhythmia.
the repolarization of the atria is hidden by the QRS wave
yes
Why is it important that the eck tracing be handled carefully and not be allow to smear or be folded in any way
P wave
the T wave, which indicates ventricular repolarization.