Effects of Different Intra-arterial Catheter Size on Frequency of Optimal Dynamic Response in Radial Arterial Waveform

Seoul National University Hospital366 enrolled

Overview

The aim of this study is to compare the effects of different intra-arterial catheter size on the frequency of optimal dynamic response in radial arterial waveform.

Study Type

INTERVENTIONAL

Allocation

RANDOMIZED

Purpose

DIAGNOSTIC

Masking

DOUBLE

Enrollment

366

Conditions

Catheters

Interventions

different intra-arterial catheter sizeDEVICE

in placebo group, patients were cannulated with 20 gauge intra-arterial catheter. In experiment groups, patients were cannulated with 22 gauge or 24 gauge intra-arterial catheter.

Eligibility

Sex: ALLMin age: 20 YearsMax age: 79 Years

Medical Language ↔ Plain English

Inclusion Criteria: * patients who were scheduled for elective neurosurgery under general anesthesia * patients with age of 20-79 and ASA class I-III * patients who are needed to establish invasive arterial pressure monitoring Exclusion Criteria: * patients who refuted to be involved in the study * patients with age of \<20 or \>80 * patients who had both arm saved * patients who had a previous history of surgery on radial artery

Locations (1)

Seoul National University Hospital

Seoul, South Korea

Outcomes

Primary Outcomes

The frequency of adequately damped arterial waveform

The accuracy of arterial blood pressure waveform is depedent on damping coefficient (DC) and natural frequency (NF). The extent to which a monitoring system is damped is expressed by the DC, while the frequency of oscillation that a monitoring system resonates at is known as the NF. The NF and DC are required to be within certain rages for accurate blood pressure monitoring, and they can be affected by different arterial catheter size. Adequately damped arterial waveform can be defined as NF and DC being within certain ranges. For example, waveforms with DC of 0.5 at a NF of 15Hz can be regarded as adequately damped arterial waveform. However, if waveforms have DC of 0.1 at a NF of 15Hz, these can be regarded as not having optimal dynamic response. (There is a reference figure explaining these factors in detail in a previous article. Gardner RM: Direct blood pressure measurement--dynamic response requirements. Anesthesiology 1981; 54:227-3)

Time frame: 1 minute after cannulation

Secondary Outcomes

The difference of mean blood pressure between invasive blood pressure and non-invasive blood pressure

At 1 minute after cannulating radial artery, we will obtain information about the mean blood pressure measured in both invasive blood pressure and non-invasive blood pressure. Invasive blood pressure will be measured from radial artery cannulation, and non-invasive blood pressure will be measured by blood pressure cuff at Rt. upper arm. Thereafter, the difference of mean blood pressure between two values will be used for data analysis.

Time frame: 1 minute after cannulation

Data from ClinicalTrials.gov

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