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Journal of Clinical Monitoring and Computing

, Volume 32, Issue 2, pp 245–252 | Cite as

Low pre-operative heart rate variability and complexity are associated with hypotension after anesthesia induction in major abdominal surgery

  • James R. PadleyEmail author
  • Erez Ben-Menachem
Original Research

Abstract

Significant hypotension after induction of general anesthesia is common and has the potential for serious complications. This study aimed to determine if pre-operative heart rate variability (HRV) was associated with post-induction hypotension in patients undergoing major abdominal surgery. Patients undergoing semi-elective major abdominal surgery were consecutively recruited during pre-admission clinic assessment. Exclusion criteria included cardiac conduction disease, arrhythmias or severe liver or renal disease. Ten minutes of electrocardiogram at 1024 Hz were recorded a median of 3 days pre-operatively. Pre-operative HRV parameters were compared in patients who experienced significant hypotension (fall in systolic and mean arterial pressure (MAP) >30% baseline and MAP ≤60 mmHg) versus those who remained haemodynamically stable after induction of general anesthesia with propofol and fentanyl. Patients who experienced hypotension after general anesthesia induction had significantly lower pre-operative HRV (SDNN 16 vs. 37 ms, p < 0.001), reduced spectral power (total power 262 vs. 1236 ms2, p = 0.002) and reduced correlation dimension, a measure of signal complexity (0.11 vs. 2.13, p < 0.001). Hypotension occurred relatively frequently in our cohort and was associated with a higher ASA grade (36 vs. 6% ASA 3, p = 0.036), hence post-induction hypotension and lower HRV may be associated with severity of illness or poor physiological reserve. Pre-operative HRV was a useful screening tool in identifying patients undergoing major abdominal surgery who were at risk of haemodynamic instability after anesthesia induction.

Keywords

Induction Autonomic Cardiovascular Propofol 

Notes

Acknowledgements

The authors gratefully acknowledge the following people for their assistance with patient recruitment (Jenny Stevens and Matthew Ho), data collection (Darren Rutgers) and acquisition of Holter monitors (Adam Hill and Jamie Vandenberg).

Funding

This study was not funded by external grants.

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

Ethical approval

All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.

Informed consent

Written informed consent was obtained by all individual participants in this study.

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Copyright information

© Springer Science+Business Media Dordrecht 2017

Authors and Affiliations

  1. 1.Department of AnaesthesiaSt Vincent’s HospitalDarlinghurstAustralia
  2. 2.Notre Dame School of MedicineDarlinghurstAustralia

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