One-Dimensional Echocardiography: Still Needed or Already Outdated?

There is a widespread lack of knowledge about one-dimensional echocardiography (M-mode) by the current generation of echocardiographers. Has two-dimensional echocardiography (B-mode) and Doppler made M-mode outdated? M-mode provides information that cannot be obtained by using B-mode or even Doppler—be it spectral, color, or tissue Doppler—for two reasons:

Now let us consider some conditions that can only be detected by M-mode and not by B-mode or Doppler, which can aid in the diagnosis via B-mode or in the understanding of pathologies.

[…]