Table 4.
Correlation of short-term QT interval variability (STVQT) with laboratory data and AN parameters in patients with IGT.
| STVQT in patients with IGT (ms) |
||
|---|---|---|
| Pearson r | P value (two-tailed) | |
| HbA1c (%) | 0.2708 | 0.277 |
| OGTT 0 min (mmol/l) | 0.2118 | 0.399 |
| OGTT 120 min (mmol/l) | −0.1118 | 0.659 |
| Heart rate (HR) variation during deep breathing (1/min) | −0.0379 | 0.881 |
| Valsalva ratio | 0.1101 | 0.664 |
| 30/15 ratio | −0.4729 | 0.048* |
| Systolic BP fall after standing up (mmHg) | −0.0163 | 0.949 |
| Diastolic BP increase after sustained handgrip (mmHg) | −0.0685 | 0.787 |
| AN score | −0.1353 | 0.593 |
Values are represented as Pearson correlation coefficient. Values are considered statistically significantly different at P < 0.05 (*).
STVQT, beat-to-beat short-term temporal variability of the QT interval; IGT, impaired glucose tolerance; HbA1c, hemoglobin A1c; OGTT, oral glucose tolerance test; 30/15 ratio, immediate HR response to standing; BP, blood pressure; AN, autonomic neuropathy.