Introduction
Subjects and Methods
Statistical Analysis
Results
Participants’ Characteristics
< 37 weeks | ≥ 37 weeks | p value | |
---|---|---|---|
Number | 28 | 181 | |
Male/female | 16/12 | 109/72 | 0.831 |
Gestational age (week) | 35.6 ± 1.1 | 38.8 ± 1.1* | < 0.0001 |
Birth weight (g) | 2330.3 ± 294.7 | 3008.1 ± 374.3* | < 0.0001 |
Birth height (cm) | 45.4 ± 2.4 | 48.6 ± 2.0* | < 0.0001 |
1 month weight | 3181.8 ± 474.8 | 4010.3 ± 544.0* | < 0.0001 |
1 month height | 49.2 ± 2.5 | 52.5 ± 2.1* | < 0.0001 |
ECG Parameters in Preterm and Control Infants
< 37 weeks (n = 28) | ≥ 37 weeks (n = 181) | p value | |
---|---|---|---|
HR (bpm) | 167.8 ± 16.5 | 163.1 ± 18.2 | 0.197 |
RR (ms) | 361.3 ± 36.7 | 373.1 ± 43.4 | 0.172 |
QRS (ms) | 63.7 ± 5.7 | 64.6 ± 4.5 | 0.301 |
QT (ms) | 246.1 ± 18.6 | 250.0 ± 20.0 | 0.339 |
QTcB (ms) | 409.6 ± 13.9 | 409.7 ± 17.7 | 0.984 |
QTcF (ms) | 345.5 ± 15.8 | 347.3 ± 17.9 | 0.615 |
Correlations Between the QTVI and Perinatal Profiles
r
|
p
| |
---|---|---|
GA | − 0.460 | 0.035 |
BW | 0.066 | 0.341 |
Apgar (1 min) | 0.035 | 0.621 |
Apgar (5 min) | 0.058 | 0.399 |
Comparison of Variability Indices
< 37 weeks (n = 28) | 37 weeks ≤ (n = 181) | p value | |
---|---|---|---|
HR mean | |||
Mean ± SD | 167.8 ± 16.5 | 163.1 ± 18.2 | 0.193 |
Median | 171.2 | 164.0 | |
HR Var | |||
Mean ± SD | 22.5 ± 25.0 | 30.9 ± 29.2* | 0.038 |
Median | 9.9 | 20.4 | |
QT mean | |||
Mean ± SD | 246.1 ± 18.6 | 249.9 ± 20.0 | 0.338 |
Median | 242.8 | 248.8 | |
QT Var | |||
Mean ± SD | 31.7 ± 16.9 | 30.7 ± 19.8 | 0.792 |
Median | 31.3 | 24.3 | |
HRVN (103) | |||
Mean ± SD | 0.84 ± 0.93 | 125 ± 1.28* | 0.026 |
Median | 0.37 | 0.79 | |
QTVN (103) | |||
Mean ± SD | 0.53 ± 0.30 | 0.50 ± 0.34 | 0.423 |
Median | 0.49 | 0.42 | |
QTVI | |||
Mean ± SD | 0.01 ± 0.50 | − 0.26 ± 0.48* | 0.023 |
Median | − 0.20 | − 0.29 |