Sonographers, what are you measuring?
M-Mode is the modality we use to obtain a fetal heart rate, but few and far between sonographers even know what they are really measuring. Unfortunately, sonography schools, though they teach the many facets of OB sonography, are not teaching how to correctly perform, interpret or measure M-mode. This is truly astounding. Why don’t we know this?!! It could make a big difference in a baby’s prognosis and treatment.
When measuring the heart rate, many sonographers are measuring the most pronounced thing they visualize, which is usually the motion of a heart valve. This is NOT the fetal heart rate, and you might be missing a significant heart dysrhythmia.
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