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ECG phase — structures involved
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    Clinical Physiology

    Normal Sinus Rhythm

    Diastole

    Ventricular filling phase.

    Step 1: SA node fires → atrial depolarization (P wave)

    P wave
    Atrial systole
    Potassium (K⁺) resting + Na/K pump
    Steps
    HR BPM
    --
    ♥
    NIBP mmHg
    --/--
    MAP
    --
    SpO2 %
    98
    PLETH
    EtCO2 mmHg
    --
    RR: 16
    Lead II 25 mm/s · 10 mm/mV
    Click trace to identify segment
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