Articles: veins.
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Acta Anaesthesiol Scand · Jan 2025
Comparative StudyComparison of venous and calculated blood gas values to arterial values in critically ill patients.
Arterial blood gas (ABG) values are important in the assessment of critically ill patients. However, arterial puncture may be challenging to perform in these patients. The venous-to-arterial conversion method (v-TAC) is used to convert venous blood gas values to calculated values meant to resemble arterial values. Calculated pH and partial pressure of carbon dioxide (PCO2) values have shown good agreement with arterial values in stable patients, but performance of the method in patients with severe acid-base disturbances is unknown. We aim to evaluate venous and calculated blood gas value congruency with arterial values in critically ill patients. ⋯ Venous and calculated pH and PCO2 values showed similar congruency with arterial values in patients with alkalemia and moderate acidaemia, while the method was unreliable in a patient suspected of severe metabolic acidaemia.
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We used computer-assisted image analysis to determine whether preexisting histological features of the cephalic vein influence the risk of non-maturation of wrist fistulas. ⋯ Computer-assisted image interpretation can help to quantify the preexisting histological patterns of the cephalic vein, while the collagen-to-muscle ratio can predict non-maturation of wrist fistula development at an early stage.
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IV access is a commonly performed procedure that is often taught based on tradition rather than evidence. The effect of arm retroflexion on vein width, either alone or in combination with a tourniquet or general anesthesia (GA), remains unclear. In this case, the sonographically measured vein width is a surrogate parameter for the success of the puncture. ⋯ This study provides evidence that retroflexion of the arm in supine patients, whether alone or in addition to a tourniquet or general anesthesia, does not have any additional effect on vein width as a surrogate parameter for successful IV success. It shows for the first time that general anesthesia effectively increases vein diameter.
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Randomized Controlled Trial
Use of Esmarch bandage does not increase peripheral vein size in healthy volunteers: A randomized clinical trial.
Ultrasound is used for peripheral intravenous (PIV) cannulation in patients with difficult landmark-guided IV access in the Emergency Department. Distal-to-proximal application of an Esmarch bandage on the target limb has been suggested as a method for increasing vein size and ease of cannulation. ⋯ This study showed that the use of an Esmarch bandage does not increase basilic vein size in healthy volunteers but is associated with a mild increase in discomfort.
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J Clin Monit Comput · Aug 2024
LetterCan the values of the venous-to-arterial PCO2 difference (pCO2 gap) be negative?
In this manuscript, we discussed if it is physiologically sound that the difference between venous-to-arterial carbon dioxide partial pressure difference (pCO2 gap) can yield negative values.