Related Experiment Video
Updated: Jun 19, 2026
11:26
Assessing Cerebral Autoregulation via Oscillatory Lower Body Negative Pressure and Projection Pursuit Regression
Published on: December 10, 2014
Factors influencing manometric pressure during pressure-controlled discography
Dong Ah Shin1, Sang Hyun Kim, In Bo Han
1CHA University College of Medicine, Seoul, Korea.
Spine
|October 16, 2009
Summary
Injection speed, contrast viscosity, and needle characteristics significantly impact manometric pressures during discography. Standardizing these factors is crucial for consistent and reliable diagnostic measurements in spinal imaging.
Area of Science:
- Spinal imaging and diagnostic procedures.
- Biomechanical analysis of intervertebral discs.
Background:
- Accurate measurement of intradiscal pressure during discography is vital for diagnostic test interpretation.
- Manometric pressure readings can be influenced by injection speed, contrast viscosity, and needle characteristics.
Purpose of the Study:
- To investigate the influence of injection speed, contrast viscosity, and needle profile on manometric pressures during discography.
- To identify key factors affecting pressure measurements for improved diagnostic accuracy.
Main Methods:
- An in vitro laboratory study utilizing an automated pressure-controlled discography system.
- Porcine cadaveric intervertebral discs were used to measure dynamic pressures (dP/dV) under varying injection speeds, contrast viscosities, and needle dimensions (diameter and length).
Main Results:
- Higher injection speed, increased contrast viscosity, smaller needle diameter (22G vs. 18G), and longer needle length (7.5 vs. 3.5 inch) all resulted in significantly higher mean dP/dV.
- Visipaque contrast media led to higher pressures than normal saline.
Conclusions:
- Factors such as high injection speed, high viscosity contrast media, small needle diameter, and long needle length elevate dynamic intradiscal pressures.
- Standardization of injection speed, contrast viscosity, and needle parameters is recommended to reduce inter-examiner variability and enhance the reliability of discography measurements.
Related Concept Videos
01:28Special 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.
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.
01:21Sites 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
The Brachial Artery: Primary Site for Blood Pressure Measurement
01:30Equipments 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...
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...
01:23Assessment 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...
01:17Measurement 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.
01:24Pressure Relationships in Thoracic Cavity
Breathing, otherwise known as pulmonary ventilation, is the process of air movement into and out of the lungs. The main mechanisms propelling pulmonary ventilation are atmospheric pressure (Patm), intra-pulmonary (Ppul ) or intra-alveolar pressure (Palv) within the alveoli, and intrapleural pressure (Pip) within the pleural cavity.
Breathing Mechanisms
Both intra-alveolar and intrapleural pressures rely on specific lung properties. The ability to breathe—allowing air to enter the lungs during...
Breathing Mechanisms
Both intra-alveolar and intrapleural pressures rely on specific lung properties. The ability to breathe—allowing air to enter the lungs during...