Fetal Vibroacoustic Stimulation in Computerized Cardiotocographic Analysis: The Role of Short-Term Variability and Approximate Entropy

Table 5

Modifications of STV (a) and ApEn (b) after VAS in high-risk pregnancies between 28th and 36th week of gestation.

(a) Ranges of increase of STV (ms) after VAS

Perinatal outcome	0–0.5	0.6–1	1.1–1.6	1.7–3.5	>3.5
Favorable (number)	2	2	2	1	3
Unfavorable (number)	8	2	3	5	0

(b) Ranges of decrease of ApEn after VAS

Perinatal outcome	0.2–0	0.5–0.3	>0.5
Favorable (number)	2	2	3
Unfavorable (number)	14	2	1