ContentsThe BasicsECG paperFive large squares represent 1 secondECG Segments and IntervalsSegmentIntervalPracticalitiesCalibrating the machineTaking a readingPlacing your electrodesLeadsBipolar limb leadsAugmented Unipolar Limb leadsUnipolar chest leadsGraph ProductionQRS in the V leadsRelated Articles This article “Understanding ECGs” is part of the almostadoctor ECG series. It provides a basic introduction to ECG waveform, and the practicalities of performing an ECG. […]