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ECG & Dysrhythmias
Terminology
Question | Answer |
---|---|
Automaticity | Ability to initiate an impulse spontaneously & continuously. |
Excitability | Ability to be electrically stimulated. |
Conductivity | Ability to transmit an impulse along a membrane in an orderly manner. |
Contractility | Ability to respond mechanically to an impulse. |
Depolarization | Reduction of a membrane potential to a less negative value. It is caused by the influx of cations, such NA & Ca, through ion channels in the membrane. In many neurons and muscle cells, Depolarization leads to an electris impulse caled an action potentia |
Repolarization | the re-establishment of polarity, especially The return of cell membrane potential to resting potential after depolarization. |
Cardiac cycle | Referring to all or any of the events related to the flow or blood pressure that occurs from the beginning of one heartbeat to the beginning of the next. http://en.wikipedia.org/wiki/Cardiac_cycle#Stages_of_the_cardiac_cycle |
Sinus rhythm | The normal beating of the heart, as measured by an electrocardiogram (ECG). |