The Fetal Modified Myocardial Performance Index: Is Automation the Future?

Table 1

Technique and machine settings used in various studies (adapted from Mahajan et al., in press [46]).

	Angle of insonation (°)	WMF (Hz)	Sample volume (mm)	Sweep velocity (cm/s)	Doppler gain	Placement of time cursor
Tei, 1995 [8]	ND	ND	ND	10	ND	Beginning of mitral inflow and aortic outflow waveforms.
Hernandez-Andrade et al., 2005 [5]	<30	70	3	15	Min.	Beginning of valve clicks.
Van Mieghem et al., 2009 [49]	<15	≥120	ND	10	ND	End of closing clicks to beginning of opening clicks.
Meriki et al., 2012 [48]	<15	300	3	15	Min.	Peak of valve clicks.
Lobmaier et al., 2014 for Siemens Antares machine^* [56]	<15	281	4	15	60 dB	Beginning of valve clicks.
Lobmaier et al., 2014 for Voluson 730 Expert machine^* [56]	<15	210	4	15	−10 dB	Beginning of valve clicks.

WMF: wall motion filter; ND: not defined; min.: minimum.
^*Values displayed are the “optimal settings” for each ultrasound machine trialled in this study, as various settings were compared.