Chapter 185 - Electrocardiogram evaluation Flashcards

1
Q

When reading an ECG, does the patient position affect the orientation and amplitude of the waveforms? The duration and intervals of the waveform?

A
  • Orientation and amplitude of the waveforms can vary markedly
  • Durations of the intervals and waveforms seldom are affected
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2
Q

What is the most notable change on the ECG due to hypercalcemia?

A

QT-interval shortening => this finding can be an important signal to the clinician to measure both total and ionized calcium levels

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3
Q

How does myocardial hypoxia affect T-waves?

A
  • Sudden appearance of large T waves can be a sign of hypoxemia;
    => any abrupt change in T-wave appearance warrants an evaluation of the patient’s blood gases
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