Outcome
Type |
Measure |
Description |
Time frame |
Safety issue |
Primary |
Association between caffeine treatment and total power (TP) spectrum of HRV |
While the newborn was sleeping, the electrical activity of the heart was recorded by using ECG Holter. TP (ms2) was obtained from a suitable 5-minute ECG segment analysed by fast Fourier transform, using the Vision Premier Programme for each bed tilt. The values were compared across the two arms of the study, using student's t-test for comparisons of normally distributed variables, and Wilcoxon signed-rank test for abnormally distributed data. |
During Procedure |
|
Primary |
Association between caffeine treatment and high frequency (HF) spectrum of HRV |
While the newborn was sleeping, the electrical activity of the heart was recorded by using ECG Holter. HF (ms2) was obtained from a suitable 5-minute ECG segment analysed by fast Fourier transform, using the Vision Premier Programme for each bed tilt. The values were compared across the two arms of the study, using student's t-test for comparisons of normally distributed variables, and Wilcoxon signed-rank test for abnormally distributed data. |
During Procedure |
|
Primary |
Association between caffeine treatment and low frequency (LF) spectrum of HRV |
While the newborn was sleeping, the electrical activity of the heart was recorded by using ECG Holter. LF (ms2) was obtained from a suitable 5-minute ECG segment analysed by fast Fourier transform, using the Vision Premier Programme for each bed tilt. The values were compared across the two arms of the study, using student's t-test for comparisons of normally distributed variables, and Wilcoxon signed-rank test for abnormally distributed data. |
During Procedure |
|
Secondary |
The correlation between postmenstrual age and total power (TP) spectrum of HRV |
While the newborn was sleeping, the electrical activity of the heart was recorded by using ECG Holter. TP (ms2) was obtained from a suitable 5-minute ECG segment analysed by fast Fourier transform, using the Vision Premier Programme for each bed tilt. The correlation between HRV parameters and postmenstrual age was tested with the Pearson correlation coefficient. |
During Procedure |
|
Secondary |
The correlation between postmenstrual age and high frequency (HF) spectrum of HRV |
While the newborn was sleeping, the electrical activity of the heart was recorded by using ECG Holter. HF (ms2) was obtained from a suitable 5-minute ECG segment analysed by fast Fourier transform, using the Vision Premier Programme for each bed tilt. The correlation between HRV parameters and postmenstrual age was tested with the Pearson correlation coefficient. |
During Procedure |
|
Secondary |
The correlation between postmenstrual age and low frequency (LF) spectrum of HRV |
While the newborn was sleeping, the electrical activity of the heart was recorded by using ECG Holter. LF (ms2) was obtained from a suitable 5-minute ECG segment analysed by fast Fourier transform, using the Vision Premier Programme for each bed tilt. The correlation between HRV parameters and postmenstrual age was tested with the Pearson correlation coefficient. |
During Procedure |
|
Secondary |
The effect of caffeine on heart rate |
Heart rate (beats per minute) was obtained from the segments, recorded by ECG Holter and analysed by the Vision Premier Programme. The selected segments corresponded to the segments HRV parameters were obtained for each bed tilt. The values were compared across the two arms of the study. |
During Procedure |
|
Secondary |
The effect of caffeine on breathing frequency |
Breathing frequency (breaths per minute) was determined manually by observing the chest movement. The measurement was performed three times while the newborn was sleeping for each bed tilt. The values were compared across the two arms of the study. |
During Procedure |
|
Secondary |
The effect of caffeine on arterial oxygen saturation |
Arterial oxygen saturation (percent) was performed by a pulse oximeter attached to the right hand. The arterial oxygen saturation value was noted three times with the corresponding breathing frequency while the newborn was sleeping for each bed tilt. The values were compared across the two arms of the study. |
During Procedure |
|
Secondary |
The effect of caffeine on body temperature |
Body temperature (degree Celsius) was measured by a frontal non-contact infrared thermometer three times for each bed tilt while the newborn was sleeping. The values were compared across the two arms of the study. |
During Procedure |
|