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- https://med.libretexts.org/Bookshelves/Nursing/An_EKG_Interpretation_Primer_(Christianson_et_al.)/01%3A_Chapters/1.05%3A_Rhythm_InterpretationThe PRI is short because, instead of the AV node receiving the electricity that originated elsewhere (and holding it for a fraction of a second, as the AV node normally does), the electricity is origi...The PRI is short because, instead of the AV node receiving the electricity that originated elsewhere (and holding it for a fraction of a second, as the AV node normally does), the electricity is originating from the AV node, resulting in a minimized or absent pause (depending on what part of the AV node has taken over as the heart’s pacemaker in place of the SA node).
- https://med.libretexts.org/Bookshelves/Nursing/An_EKG_Interpretation_Primer_(Christianson_et_al.)/01%3A_Chapters/1.04%3A_EKG_Machinery_and_SetupNotice that the positive electrode for lead I is the same as the negative for lead III - every physical electrode placed is capable of measuring both positively and negatively in the way the left uppe...Notice that the positive electrode for lead I is the same as the negative for lead III - every physical electrode placed is capable of measuring both positively and negatively in the way the left upper chest electrode does. This has to do with the placement of the negative virtual electrode, between the RA and LL electrodes; the electricity flows simultaneously in both directions, and the amount of electricity going toward both electrodes is closer to equal than it is in lead I.
- https://med.libretexts.org/Bookshelves/Nursing/An_EKG_Interpretation_Primer_(Christianson_et_al.)/01%3A_Chapters/1.03%3A_Electrical_Activity_of_the_Heart_and_Basic_Wave_Forms_on_an_EKGThis means that, if a particular part of the heart becomes the default pacemaker instead of the SA node, it will typically set the resting rate at the following heart rates: The SA node is typically t...This means that, if a particular part of the heart becomes the default pacemaker instead of the SA node, it will typically set the resting rate at the following heart rates: The SA node is typically the default because it is the fastest - other nodes can take over and override the SA node if they contract more rapidly than the SA is going. P wave: The electricity in the heart flowing from the SA node through the atria to the AV node; stimulates the atria to contract
- https://med.libretexts.org/Bookshelves/Nursing/An_EKG_Interpretation_Primer_(Christianson_et_al.)/01%3A_Chapters/1.06%3A_Twelve_Leads_and_Special_RhythmsMany of the leads appear to mostly go in one direction because the right side depolarizes first, then the left; as the electricity in the right side is flowing away from the unipolar electrodes during...Many of the leads appear to mostly go in one direction because the right side depolarizes first, then the left; as the electricity in the right side is flowing away from the unipolar electrodes during the S wave at the end of its QRS complex, the left side is beginning its depolarization as the right is ending, resulting in electricity flowing away from the right precordial electrodes in a much larger quantity than compared to normal depolarization (remember that the height of a wave correlates…
- https://med.libretexts.org/Bookshelves/Nursing/An_EKG_Interpretation_Primer_(Christianson_et_al.)This book teaches healthcare professionals the basics of EKG interpretation.
- https://med.libretexts.org/Bookshelves/Nursing/An_EKG_Interpretation_Primer_(Christianson_et_al.)/01%3A_Chapters/1.01%3A_Anatomy_and_Physiology_of_the_HeartWhen the cell reaches a certain voltage, voltage-gated channels open in the cell membrane, allowing other ions to flow in and out, depolarizing the cell by allowing ions to flow in more quickly, reach...When the cell reaches a certain voltage, voltage-gated channels open in the cell membrane, allowing other ions to flow in and out, depolarizing the cell by allowing ions to flow in more quickly, reaching a near-equilibrium in charge between the outside of the cell and inside.
- https://med.libretexts.org/Bookshelves/Nursing/An_EKG_Interpretation_Primer_(Christianson_et_al.)/01%3A_Chapters/1.02%3A_EKG_Basics_and_TerminologyThis enables the ventricles to pump from the bottom toward the top and is an important feature given the anatomic location of the semilunar valves near the top of the ventricles. We will start at the ...This enables the ventricles to pump from the bottom toward the top and is an important feature given the anatomic location of the semilunar valves near the top of the ventricles. We will start at the beginning of the complex (where it deviates upward from the baseline, in this example) and end at the end of the complex (where it returns to the baseline).
