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Related Concept Videos

Measurement of Blood Pressure01:17

Measurement of Blood Pressure

Assessing blood pressure is a standard procedure executed in virtually all medical environments. The method utilized today was established over a hundred years ago by an innovative Russian doctor, Dr. Nikolai Korotkoff. The soft ticking noise, known as Korotkoff sounds, heard while taking blood pressure readings results from turbulent blood flow within the vessels. The apparatus required for this procedure includes a sphygmomanometer, a blood pressure cuff attached to a gauge, and a stethoscope.
Uncertainty in Measurement: Reading Instruments02:46

Uncertainty in Measurement: Reading Instruments

Counting is the type of measurement that is free from uncertainty, provided the number of objects being counted does not change during the process. Such measurements result in exact numbers. By counting the eggs in a carton, for instance, one can determine exactly how many eggs are there in the carton. Similarly, the numbers of defined quantities are also exact. For example, 1 foot is exactly 12 inches, 1 inch is exactly 2.54 centimeters, and 1 gram is exactly 0.001 kilograms. Quantities...
Assessment of blood pressure in brachial artery(two-step method)01:23

Assessment of blood pressure in brachial artery(two-step method)

Measuring blood pressure is a fundamental skill in healthcare that aids in diagnosing and monitoring hypertension and other cardiovascular conditions. An aneroid sphygmomanometer, commonly used in clinical settings, offers a manual and precise method for blood pressure measurement. The technique for using this instrument involves specific steps that must be carefully executed to ensure accuracy. The following detailed description outlines a two-step technique for assessing blood pressure using...
Assessment of blood pressure in brachial artery(one-step method)01:15

Assessment of blood pressure in brachial artery(one-step method)

This procedural guide systematically measures blood pressure using an oscillometric digital sphygmomanometer, emphasizing accuracy, patient safety, and comfort.
Prepare for the Procedure:
Equipments Used To Measure Blood Pressure01:30

Equipments Used To Measure Blood Pressure

Direct Method
This invasive approach involves cannulating a peripheral artery. During each cardiac contraction, pressure generates mechanical motion within the catheter, transmitted through rigid, fluid-filled tubing to a transducer. This transducer converts mechanical motion into electrical signals displayed as waveforms on a monitor. An automatic flushing system prevents blood backflow. Due to the potential risk of unexpected arterial blood loss, this method is primarily used in intensive...
Assessing Blood pressure using a doppler ultrasound01:19

Assessing Blood pressure using a doppler ultrasound

To obtain accurate blood pressure measurements in clinical settings, especially when traditional methods are insufficient, healthcare professionals utilize the Doppler ultrasound technique. This method uses high-frequency sound waves to detect blood flow within the arteries, which is crucial for patients with conditions that complicate circulatory system assessment.
Pre-Procedural Guidelines for Doppler Ultrasound Blood Pressure Assessment:
Preparation of Equipment:

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Related Experiment Video

Updated: Jul 8, 2026

Conducting Respiratory Oscillometry in an Outpatient Setting
14:49

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Measurement agreement between a portable and a conventional impulse oscillometry system: a two-centre

Shihua Yao1, Rui Zhang2, Bingxia Chen1

  • 1National Clinical Research Center for Respiratory Diseases; National Center for Respiratory Medicine; State Key Laboratory of Respiratory Disease; Guangzhou Institute of Respiratory Health, First Affiliated Hospital of Guangzhou Medical University, Guangzhou, Guangdong, China.

BMJ Open Respiratory Research
|July 6, 2026
PubMed
Summary
This summary is machine-generated.

The portable IOS 600 shows high agreement with the MasterScreen-IOS for core airway mechanics measurements. This device may complement airway function assessment, particularly in adults.

Keywords:
Equipment EvaluationsRespiratory Function TestRespiratory Measurement

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Area of Science:

  • Pulmonary Function Testing
  • Respiratory Mechanics
  • Medical Device Evaluation

Background:

  • Impulse oscillometry (IOS) assesses airway mechanics during tidal breathing, beneficial for uncooperative patients.
  • Portable IOS devices are increasingly used for community and bedside pulmonary function assessment.
  • Evaluating agreement between portable and laboratory IOS systems is crucial.

Purpose of the Study:

  • To compare measurement and clinical classification agreement between the portable IOS 600 and the Jaeger MasterScreen-IOS.
  • To validate the accuracy of a new portable device against a gold standard.

Main Methods:

  • A prospective, two-centre study comparing IOS measurements from two devices in adult and pediatric participants.
  • Analysis included core parameters (Z5, R5, R20, X5, Fres) using ICC, Bland-Altman, and Gwet's AC1.
  • Randomized measurement sequence and single-visit assessments ensured methodological rigor.

Main Results:

  • High interdevice agreement for core IOS parameters (ICCs 0.902-0.961).
  • Strong to almost perfect clinical classification agreement for key parameters (Gwet's AC1 0.90-0.96).
  • Proportional bias noted for Z5, R5, and Fres, requiring cautious interpretation at abnormal values.

Conclusions:

  • The portable IOS 600 exhibits high measurement and classification agreement with the MasterScreen-IOS for core parameters in adults.
  • The device shows potential as a complementary tool for airway function assessment.
  • Further validation is recommended in pediatric populations and diverse clinical settings.