Novel functional advanced echocardiography for the assessment of myocardial mechanics in children with neurocardiogenic syncope – a blinded prospective speckle tracking head-up tilt-table challenge study

Table 3 Speckle tracking derived peak systolic LV strain rate at rest and during head-up tilt table testing

		Syncope (HUTT+) (n = 21)	Syncope (HUTT-) (n = 22)	Control (n = 41)	p-value (ANOVA)
Baseline	Circumferential strain rate (s⁻¹)	−1.46 ± 0.47	−1.59 ± 0.69	−1.75 ± 0.47	0.032
	Longitudinal strain rate (s^− 1)	−1.08 ± 0.45	− 1.16 ± 0.18	− 1.39 ± 0.49	< 0.001
	Circumferential strain (%)	−21.9 ± 7.24	−22.99 ± 7.82	−24.00 ± 5.89	0.186
	Longitudinal strain (%)	−21.31 ± 8.9	−20.94 ± 1.94	−20.48 ± 5.21	0.468
		(n = 15)	(n = 14)	(n = 16)
HUTT	Circumferential strain rate (s⁻¹)	−1.46 ± 0.69	−1.51 ± 0.54	− 1.49 ± 0.25	0.860
	Longitudinal strain rate (s⁻¹)	−1.03 ± 0.52	− 1.07 ± 0.28	−1.14 ± 0.59	0.144
	Circumferential strain (%)	−22.24 ± 10.69	−21.98 ± 7.71	− 22.46 ± 3.67	0.915
	Longitudinal strain (%)	−20.48 ± 10.47	−20.86 ± 5.54	− 20.93 ± 10.98	0.926

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