BIPN 100 Lecture Notes - Lecture 13: Qrs Complex, Qt Interval, T Wave
16 Dec 2018
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*** ekg measures electrical signals not muscle contractions. Measures the vector of the electrical signals. Qrs wave: refer to different aspects of ventricular depolarization. Q: electrical signals propagate down the septum (gives the first downward deflection) 5 squares correspond to one second (5 squares = 1 second) Which is followed by ventricular repolarization (t wave) Covers the entire cycle of depolarization and repolarization of the ventricles. P wave and qrs segment should be evenly spaced every cycle. Electrical signal is being produced in the sa node, the atria are depolarizing, but the signal is not propagating to the ventricles. Abnormally long timing between qrs complex and t wave. Ventricles are contracting, but not relaxing in a regular way. Mechanical events lag behind the electrical signals of the ekg**** Sa node cells are getting innervation from the sympathetic and parasympathetic nervous system. This is what changes your heart rate based on the needs of your body at that current moment.
