Radial Artery Puncture
Radial Artery Puncture - Related Videos
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Arterial Line Placement
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2023
Source: Sharon Bord, MD, Department of Emergency Medicine, The Johns Hopkins University School of Medicine, Maryland, USA When monitoring patients, it is important to obtain values that are accurate and reliable. Blood pressure monitoring is one of the essential vital signs, and for a majority of patients, measuring it utilizing non-invasive techniques provides accurate values. However, there are situations in which the blood pressure requires more exact, specific, and reliable measurements.
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Cecal Ligation Puncture Procedure
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The mouse model of cecal ligation and puncture as a valuable tool for the study of human sepsis.
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Cardiac Blood Collection via Subclavian Puncture in Mice
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Subclavian cardiac puncture is a simple, reliable method for collecting terminal blood in mice. It is easy to operate and ensures high-purity samples.
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Drawing Blood from Rats through the Saphenous Vein and by Cardiac Puncture
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Blood draws are necessary in a large number of studies, for example to study the pharmacokinetics profile of a compound. Here, we demonstrate how to draw blood from rats using two techniques: blood draw from the saphenous vein or by cardiac puncture.
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Radial System Protection
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2024
Radial systems employ time-delay overcurrent relays to reduce load interruptions. When a fault occurs, the nearest breaker opens first, while upstream breakers remain closed due to longer delay settings. This approach ensures minimal disruption to the rest of the system. In a radial system with a fault downstream of the third breaker, ideally, only the third breaker will open, isolating the fault and interrupting the load connected beyond it. The second breaker has a longer delay setting,...
FAQs
Blood enters the collection device because pressure within the radial artery is pulsatile. Once the needle reaches the vessel, that pressure drives arterial blood into the device, so venous aspiration is not required. This pressure-dependent flow also helps distinguish arterial collection from a process that would require withdrawing blood by suction.
Collateral circulation is assessed to determine whether the hand has an alternative blood supply before the radial artery is accessed. The Allen or modified Allen test provides this assessment. Because the radial artery contributes to hand perfusion, confirming collateral flow helps support selection of the site for diagnostic sampling or pressure monitoring.
An arterial blood gas sample provides information about oxygenation, carbon dioxide removal, and acid–base status. These measurements allow clinicians to evaluate several aspects of respiratory and metabolic condition from one arterial specimen. The information is especially relevant when clinical decisions depend on assessing gas exchange or acid–base balance.
A single puncture provides a specimen for analysis, whereas catheter placement establishes access that can support continuous arterial pressure monitoring. The catheter therefore supplies ongoing hemodynamic information rather than only one measurement. This distinction makes catheterization useful when pressure trends must be followed during critical-care management.
The workflow begins by assessing collateral hand circulation, typically with an Allen or modified Allen test. After the site is assessed, a needle is introduced into the radial artery, and arterial pressure allows blood to enter a collection device. If continuous monitoring is needed, catheter placement can provide ongoing arterial pressure information.
This procedure is most useful for short-term diagnostic and critical-care applications. Clinicians can obtain arterial blood for gas analysis when oxygenation, carbon dioxide removal, or acid–base status must be evaluated. When catheter placement is selected instead, the same arterial access can support continuous hemodynamic monitoring rather than a single diagnostic measurement.