Noninvasive Measurement of the Human Brachial Artery Pressure–Area Relation in Collapse and Hypertension

The direct effects of angiotensin and norepinephrine on forelimb vessels were compared in the dog, cat, and monkey in constant-flow forelimb preparations. Equiweight and equimolar injections and in some instances equiweight infusions were carried out. Brachial artery pressure (BAP), small vein pressure (SVP), and limb weight changes were continuously recorded. In some instances, intact, natural-flow preparations were employed. With equimolar injections in constant-flow limbs, angiotensin increased limb BAP and SVP more than norepinephrine in the dog and cat, and caused a significantly greater loss of limb weight in the dog. With equiweight doses, angiotensin caused a greater increase of cat forelimb BAP and SVP and monkey SVP; norepinephrine injection resulted in a greater increase of dog limb BAP and SVP and approximately the same increase of monkey BAP as angiotensin. Limb weight loss was not significantly different in any species. The initial SVP elevations produced by angiotensin and norepinephrine infusion were about equal, but the small veins became unresponsive to angiotensin after several minutes of infusion.

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Comparsion of central aortic pressure to brachial artery pressure in hypertensive patients on drug treatment: An observational study

Indian Heart Journal ◽

10.1016/j.ihj.2018.10.418 ◽

2018 ◽

Vol 70 ◽

pp. S208-S212

Author(s):

Bilal Ahmad Baba ◽

Pandit Tafiq Johan ◽

Jagdish C. Mohan

Keyword(s):

Observational Study ◽

Drug Treatment ◽

Brachial Artery ◽

Aortic Pressure ◽

Hypertensive Patients ◽

Artery Pressure ◽

Central Aortic Pressure

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Acoustic Response of Arteries Using Thick Wall Tube Assumption

Volume 2: Biomedical and Biotechnology Engineering ◽

10.1115/imece2009-12271 ◽

2009 ◽

Author(s):

A. M. Al-Jumaily ◽

A. Salam Al-Ammri

Keyword(s):

Brachial Artery ◽

Diastolic Pressure ◽

Cuff Pressure ◽

Time Lag ◽

Thick Wall ◽

Thin Wall ◽

Feature Points ◽

Acoustic Response ◽

Time Duration ◽

Artery Pressure

This paper describes the pressure wave propagation and reflection phenomenon in the aorta and the brachial artery to reproduce the brachial artery pressure and the strain imposed on the cuff external wall using thick wall tube assumption for the aorta. The effects of variations in aortic radius, thickness, heart rate and cuff pressure on the brachial artery pressure contours and pneumatic cuff strain contours were investigated The thick wall tube assumption for the aorta will improve the accuracy of the results and give an indication about the error involved when using thin wall tube assumption. The results indicate that there are some differences between the trends and shapes of the curves when using thick wall assumption. This difference could be as high as 3% for the eight feature points extracted from the pressure and strain contours. These feature points are the time duration before the deflection marking the arrival of the incident and reflected wave, the peak of the first and second pressure deflection minus the diastolic pressure, the peak of the first and second strain deflection minus the strain at diastolic pressure. These features points are used to calculate the brachial augmentation indices and the time lag which are used as a measure of arterial stiffness.

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