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Endotracheal suctioning-induced heart rate alterations
L P Gunderson1, K S Stone, R L Hamlin
1College of Nursing and Health, University of Cincinnati, OH.
Nursing Research
|May 1, 1991
Summary
Endotracheal suctioning (ETS) in newborn swine caused significant drops in arterial oxygen. While suctioning led to greater oxygen decline, heart rate changes were temporary and not solely due to neural factors.
Area of Science:
- Neonatal physiology
- Respiratory care
- Cardiovascular regulation
Background:
- Endotracheal suctioning (ETS) is a common procedure in neonatal intensive care.
- Understanding the physiological effects of ETS, particularly on heart rate and oxygenation, is crucial for patient safety.
- The specific mechanisms, whether mechanical or neural, driving heart rate alterations during ETS require further elucidation.
Purpose of the Study:
- To investigate the mechanical and/or neural factors influencing heart rate changes during endotracheal suctioning (ETS) in newborn swine.
- To assess the impact of catheter insertion alone versus catheter insertion with suction on arterial oxygen partial pressure (PaO2) and heart rate.
- To examine these effects before and after vagal blockade using atropine.
Main Methods:
- Experimental study involving eleven newborn swine (<24 hours old).
- Subjects underwent two protocols: catheter insertion alone and catheter insertion with suction.
- Measurements included electrocardiogram (ECG) for heart rate (HR) and arterial blood gases for PaO2, analyzed before and at multiple time points after ETS, with and without atropine administration.
Main Results:
- A significant decrease in PaO2 was observed at 20 seconds post-ETS in both protocols (p < .05).
- Suctioning resulted in a more pronounced PaO2 decline (41 torr) compared to no suction (13 torr) at 20 seconds, a pattern maintained after vagal blockade.
- Initial heart rate decline was observed with both methods, but the difference between suction and no suction was transient, disappearing after the second catheter pass. No significant HR difference was noted post-atropine.
Conclusions:
- The study suggests that while ETS significantly impacts oxygenation, the associated heart rate alterations are likely multifactorial and not solely mediated by neural reflexes, as evidenced by the transient nature and lack of difference after vagal blockade.
- Mechanical stimulation from catheter insertion plays a role in initial heart rate changes.
- Further research is needed to fully delineate the complex interplay of factors affecting cardiovascular responses to ETS in neonates.