Doppler: Cardiac Output Measured by Doppler Echocardiography.

In R4HCR: R for Health Care Research

Cardiac Output Measured by Doppler Echocardiography.

Description

Cardiac output measured using Doppler echocardiography by two different observers.

Usage

Doppler

Format

A data frame with 23 observations on the following 2 variables.

A

Cardiac ouput measured by observer A (litres/minute).

B

Cardiac ouput measured by observer B (litres/minute).

Details

In a study to assess the inter-observer reproducibility of cardiac output. Twenty-three ventilated patients were measured non-invasively by Doppler echocardiography. From the four-chamber view of the heart, the readings were made by positioning the Doppler sample volume at the mitral anulus plane.

Source

Müller, R. and Büttner, P., 1994. A critical discussion of intraclass correlation coefficients. Statistics in Medicine, 13(23‐24), pp.2465-2476.

Examples

require(irr)

data(Doppler, package = "R4HCR")

# Intra-class correlation.
icc(Doppler,
model = "twoway",
type = "agreement",
unit = "single")

R4HCR documentation built on Sept. 30, 2024, 9:46 a.m.