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Cardiac sympathovagal balance during endoscopic retrograde cholangiopancreatography
M Petelenz1, J Musialik, P Besser
1Dept. of Internal Medicine, Silesian University Medical School, Katowice, Poland. mpet@sla.com.pl
Insights
Contrast injection during ERCP affects the autonomic nervous system differently based on common bile duct size. Normal-sized ducts show a sympathovagal response, unlike dilated ducts.
Area of Science:
- Gastroenterology
- Autonomic Nervous System Physiology
- Cardiopulmonary Medicine
Background:
- Cardiopulmonary complications are known risks during upper gastrointestinal endoscopy and ERCP.
- The autonomic nervous system's role in these complications requires further investigation.
Purpose of the Study:
- To investigate the sympathovagal response to common bile duct (CBD) distension during ERCP.
- To compare the autonomic response between normal-sized and dilated CBDs.
Main Methods:
- 16 patients undergoing ERCP were divided into two groups: normal CBD size (Group A) and dilated CBD (Group B).
- Heart rate variability (HRV) was measured using Holter monitoring.
- Frequency domain analysis of HRV (LF and HF components) assessed sympathovagal balance.
Main Results:
- Contrast injection into normal-sized CBDs (Group A) caused a significant increase in both LF and HF components of HRV.
- No significant sympathovagal response was observed after contrast injection in patients with dilated CBDs (Group B).
Conclusions:
- Contrast medium injection into a normal-sized CBD during ERCP elicits a distinct sympathovagal response.
- Dilated CBDs undergoing contrast injection during ERCP do not appear to stimulate the autonomic nervous system in the same manner.
Background And Study Aims:
Cardiopulmonary complications have been reported during upper gastrointestinal endoscopy and endoscopic retrograde cholangiopancreatography (ERCP). The aim of this study was to evaluate the sympathovagal response to the stretching of the common bile duct caused by contrast medium injection during ERCP.
Patients And Methods:
The 16 patients included in the study were assigned to two groups according to the size of common bile duct. Group A consisted of patients with normal-sized bile ducts, while Group B patients had dilated common bile ducts. The heart rate variability (HRV) technique was used to assess the sympathovagal balance. The HRV data were gathered using the Holter technique, and frequency domain analysis revealed two main spectral components of HRV: low frequency (LF) and high frequency (HF).
Results:
In patients with normal-sized bile ducts, contrast injection initiated a rapid increase in the power spectra (ms2) of both the HF and LF components. In patients with dilated common bile ducts, this phenomenon was not observed.
Conclusions:
During ERCP, contrast injection into a dilated common bile duct does not stimulate the autonomic nervous system in the same way as it does when the common bile duct is of normal size.