Question about Schiller Welch Allyn Cardiovit At 2 Interpretive Ekg Machine

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How does ECG machine find that signals are good for printing (in auto mode)? some ECG machines take up to 20 second time for printing start

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Electro Med Services

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When the at2 is in auto mode, first of all it check the leads are properly connected or not.Then it will acquire the ECG and store the same in its memory then only it starts printing. that's why it takes that much time to give a printout. When its starts printing you can remove the connections from the patient because it have already memorized the ECG.
If interpretation is in on position it will compare the acquired ecg with the standards in its memory (allready programed by the manufacturer). and will give a detailed report with ecg.

Posted on Feb 06, 2011

  • Anonymous Feb 06, 2011

    Thank you for your response, I agree with all you mentioned but that was not my purpose exactly:
    Some good ECG machines, if signals have no good quality for example EMG artifact, reject stored data and initialize the storage again before printing. What are the criteria for rejecting bad signals for printing? (Does machine calculate correlation between different channels or it judges on Baseline artifact or else?)
    Best regards,
    Alireza Davari

  • Electro Med Services
    Electro Med Services Feb 07, 2011

    The word artifact is similar to artificial in the sense that it is often used to indicate something that is not natural (i.e. man-made). In electrocardiography, an ECG artifact is used to indicate something that is not "heart-made." These include (but are not limited to) electrical interference by outside sources, electrical noise from elsewhere in the body, poor contact, and machine malfunction. Artifacts are extremely common, and knowledge of them is necessary to prevent misinterpretation of a heart's rhythm.
    1.Pacing spikes:

    These are seen in someone whose implanted pacemaker is firing.

    The sharp, thin spike is an electrical signal produced by an artificial pacemaker. The wide QRS complex that follows it represents the ventricles depolarizing. We say that the "(artificial) pacemaker captures" when it is able to successfully depolarize its intended target. If a pacing spike is not followed by its intended response, we say that it has failed to capture.
    2.Reversed leads / misplaced electrodes:
    Electrode/lead placement is very important. If one were to accidentally confuse the red and white lead cables (i.e. place the white one where the red one should go, vice versa), In this ECG, we can make out a normal sinus rhythm with all of the waves upside-down. When this happens, you are essentially viewing the rhythm in a completely different lead.

    One must also make sure that the lead wires are actually plugged into the machine. If your talkative patient shows asystole, you should suspect this. Many machines are "smart" in that they can sense common errors of this nature, but many such errors aren't always readily apparent.
    3.AC interference:

    Alternating current (AC) describes the type of electricity that we get from the wall. In the United States, the electricity "changes direction" 60 times per second (i.e. 60 hertz). (Many places in Europe use 50 Hz AC electricity.) When an ECG machine is poorly grounded or not equipped to filter out this interference,. If one were to look at this ECG line closely, he would see 60 up-and-down wave pattern in a given second (25 squares).
    4.:Muscle tremor / noise:
    The heart is not the only thing in the body that produces measurable electricity. When your skeletal muscles undergo tremors, the ECG is bombarded with seemingly random activity. The term noise does not refer to sound but rather to electrical interference.
    Low amplitude muscle tremor noise can mimic the baseline seen in atrial fibrillation. Muscle tremors are often a lot more subtle than that shown.
    5.Wandering baseline:
    In wandering baseline, the isoelectric line changes position. One possible cause is the cables moving during the reading. Patient movement, dirty lead wires/electrodes, loose electrodes, and a variety of other things can cause this as well.
    6.Absolute heart block:
    Absolute heart block (or 4th degree heart block) results from over-exposure to imported-liquor advertisements in magazines. QRS complexes are wide and bottle-shaped and show no relationship with the P wave. It occurs very rarely, and even then, only in fictional settings. This should not be confused with the real arrhythmia complete heart block.



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