Time Frequency Analysis of Electrocardiogram and Blood Pressure in Intracranial Hemorrhage Patients

July 10, 2008 updated by: National Taiwan University Hospital

Multiscale Entropy and Time-Frequency Analysis of Electrocardiogram and Blood Pressure in Patients With Spontaneous Intracranial Hemorrhage

Dysregulation of autonomic nervous system is evident in patients with spontaneous intracranial hemorrhage. In this study, we utilize a non-invasive method (heart rate and blood pressure variability analysis to analyze the autonomic activities in this group of neurosurgical patients. Our aim is to determine the utility of this modality in risk stratification and outcome prediction in these patients.

Study Overview

Status

Unknown

Conditions

Detailed Description

Spontaneous intracranial hemorrhage is an absolute emergency in the field of neurosurgery, and it is also a devastating event that commonly results in major neurological disabilities or mortalities. Since disease severities and clinical courses vary in each patient, pathophysiological studies and prognostic factors are always worth research. From previous studies, we know that dysregulation of autonomic system plays an important role in intracranial hemorrhage. Hemorrhage itself is associated with sympathoexcitation, and patients who develop rebleeding or infarction complications are found to have an even higher degree of sympathetic storm. Therefore, the degree of autonomic activities seems to be a useful predictor.

Traditionally, sympathetic activities are measured by plasma catecholamine, while parasympathetic activities are hard to measure. In recent decades, the application of engineering in biological fields makes a great breakthrough. Waveform analysis of biological signals, such as electrocardiograms and arterial blood pressure, can indirectly determine autonomic activities. The variabilities of heart rate and blood pressure are subjected to frequency analysis. This generates several dominant frequency bands. High frequency bands (0.15-0.40Hz) are attributed to the effect of parasympathetic nervous system, while, the low frequency bands (0.04-0.15 Hz) are attributed to the effect of both sympathetic and parasympathetic nervous systems.

In this study, all patients with spontaneous intracranial bleedings undergo standard treatment and monitoring. This include electrocardiography, arterial blood pressure, and cerebral blood flow using transcranial Doppler sonography. For those who also have intracranial pressure monitoring, the intracranial pressure are also recorded. All these biological signals are exported for wave form analysis. We use frequency analysis, time-frequency analysis, and multiscale entropy to analyze these data. The results of analyses were also correlated to plasma catecholamine levels, proinflammatory markers, as well as the clinical variables. Our aim is to identify predictors of complications and grave outcomes from these biological signals. We also apply the results for future pathophysiological studies.

Study Type

Observational

Enrollment (Anticipated)

100

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Contact

Study Locations

  • Taiwan
      • Taipei, Taiwan, 112
        • Recruiting
        • Devision of Neurosurgery, National Taiwan University Hospital
        • Contact:
      • Taipei, Taiwan, 112
        • Not yet recruiting
        • Department of Surgery, National Taiwan University Hospital
        • Contact:
          • Yong-Kwang Tu, MD, PhD
          • Phone Number: 5078 886-2-23123456
          • Email: yktu@ntuh.gov.tw

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Ages Eligible for Study

  • Child
  • Adult
  • Older Adult

Accepts Healthy Volunteers

No

Genders Eligible for Study

All

Sampling Method

Non-Probability Sample

Study Population

Patients with spontaneous intracranial hemorrhage

Description

Inclusion Criteria:

  • Spontaneous intracranial hemorrhage with radiographical confirmation

Exclusion Criteria:

  • Traumatic or undefined mechanisms for intracranial hemorrhage
  • Pre-existing cardiac arrythmia
  • Patients who had previous histories of intracranial, cardiac, hepatic, renal, or lung diseases

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Time Frame
Activity of autonomic nervous activities determined by low frequency and high frequency energies in heart rate variability
Time Frame: 14 days within initial ictus
14 days within initial ictus

Secondary Outcome Measures

Outcome Measure
Time Frame
Presence of vasospasm or not
Time Frame: 14 weeks
14 weeks

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

National Taiwan University Hospital

Investigators

  • Principal Investigator: Yong-Kwang Tu, M.D.., Ph.D, National Taiwan University Hospital

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start

April 1, 2008

Primary Completion (Anticipated)

April 1, 2008

Study Registration Dates

First Submitted

July 9, 2008

First Submitted That Met QC Criteria

July 10, 2008

First Posted (Estimate)

July 11, 2008

Study Record Updates

Last Update Posted (Estimate)

July 11, 2008

Last Update Submitted That Met QC Criteria

July 10, 2008

Last Verified

July 1, 2008

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

  • 200803013R

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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