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Related Concept Videos

Errors occurring during blood pressure monitoring01:25

Errors occurring during blood pressure monitoring

Blood pressure monitoring is a crucial clinical procedure in diagnosing and managing various cardiovascular conditions. Despite its significance, the accuracy of blood pressure measurements can be compromised by multiple factors, potentially leading to either falsely high or low readings. These inaccuracies are critical as they can significantly impact patient care. So, it is vital to understand these challenges deeply and adopt strategic approaches to minimize errors.
Several factors...
Special considerations while measuring blood pressure01:28

Special considerations while measuring blood pressure

When assessing blood pressure (BP), healthcare professionals must consider various factors and potential unexpected outcomes to ensure accurate readings and provide proper patient care. Adhering to these guidelines is essential to achieving the most reliable results.
Monitoring Both Arms:
Monitoring BP in both arms during the initial assessment is advisable, as the systolic value may differ by five to ten mm Hg between arms. For subsequent BP assessments, use the arm with the higher reading.
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.
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...
Assessment of Ventilation II: Respiratory Depth and Rhythm01:29

Assessment of Ventilation II: Respiratory Depth and Rhythm

Respiratory Depth
Respiratory depth measures the volume of air inhaled or exhaled during a breath. It can vary from shallow to deep and typically remains consistent when a person is at rest or asleep. Occasionally, individuals will automatically inhale deeply, known as sighing, which inflates the lungs with more air than normal breathing.
To assess respiratory depth, observe the degree of chest excursion or movement:
Sites for measuring blood pressure01:21

Sites for measuring blood pressure

Blood pressure measurement is a fundamental clinical procedure, providing crucial data for assessing cardiovascular health. Among the various sites for this measurement, the brachial and popliteal arteries are predominantly utilized due to their accessibility and the reliability of their readings. This lesson delves into the anatomical significance, methodology, and considerations of measuring blood pressure at these locations.
The Brachial Artery: Primary Site for Blood Pressure Measurement

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Related Experiment Video

Updated: Jun 28, 2026

Monitoring Lung Function with Electrical Impedance Tomography in the Intensive Care Unit
05:56

Monitoring Lung Function with Electrical Impedance Tomography in the Intensive Care Unit

Published on: September 6, 2024

Compression feedback devices over estimate chest compression depth when performed on a bed.

Gavin D Perkins1, Laura Kocierz, Samuel C L Smith

  • 1Warwick Medical School, University of Warwick, Warwick CV4 7AL, United Kingdom. g.d.perkins@warwick.ac.uk

Resuscitation
|October 28, 2008
PubMed
Summary

CPR feedback devices may underestimate chest compressions on beds, leading to inadequate resuscitation. Using a backboard can improve compression depth during cardiopulmonary resuscitation (CPR).

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Fabrication of Compressed Hosiery and Measurement of its Pressure Characteristic Exerted on the Lower Limbs
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Fabrication of Compressed Hosiery and Measurement of its Pressure Characteristic Exerted on the Lower Limbs

Published on: May 27, 2020

Related Experiment Videos

Last Updated: Jun 28, 2026

Monitoring Lung Function with Electrical Impedance Tomography in the Intensive Care Unit
05:56

Monitoring Lung Function with Electrical Impedance Tomography in the Intensive Care Unit

Published on: September 6, 2024

Fabrication of Compressed Hosiery and Measurement of its Pressure Characteristic Exerted on the Lower Limbs
08:39

Fabrication of Compressed Hosiery and Measurement of its Pressure Characteristic Exerted on the Lower Limbs

Published on: May 27, 2020

Area of Science:

  • Cardiopulmonary Resuscitation (CPR)
  • Biomedical Engineering
  • Medical Device Technology

Background:

  • CPR feedback devices are increasingly used in clinical practice.
  • A limitation is their inability to measure mattress compression during CPR on beds.
  • This can lead to inaccurate guidance of CPR performance.

Purpose of the Study:

  • To quantify mattress compression versus chest compression using a Q-CPR sensor.
  • To evaluate the effect of backboards on mattress compression during CPR.
  • To assess the accuracy of CPR feedback devices on different surfaces.

Main Methods:

  • CPR was simulated on a manikin placed on the floor and on beds with foam or inflatable mattresses.
  • Chest and mattress compression depths were measured using an accelerometer and manikin sensors.
  • The impact of using backboards was assessed.

Main Results:

  • CPR devices significantly underestimated chest compressions on mattresses (foam: 26.2mm, inflatable: 32.2mm).
  • Mattress compression accounted for 35-40% of total compression depth.
  • Backboards improved chest compression depth (narrow: 1.9mm, wide: 2.6mm).

Conclusions:

  • CPR feedback devices failing to account for mattress compression can cause significant under-compression.
  • This inaccuracy may compromise resuscitation effectiveness.
  • Backboards can partially mitigate under-compression issues.