Volume–pressure Relationships of the Turkey Aorta

Abstract

This experiment was an attempt to define the volume–pressure relationships of the untreated turkey aorta and to evaluate the effect on these relationships of treatment with beta-aminopropionitrile (BAPN) and ascorbic acid. Distensibility values (ΔV/ΔP) were calculated for each of three linear segments of the volume–pressure curve for treated and untreated thoracic and abdominal aortas. In general, the distensibility of the thoracic aorta was greater than that of the abdominal aorta. In both aortic segments addition of BAPN to the ration tended to increase, whereas the addition of ascorbic acid tended to decrease distensibility. The volume–pressure curve of the thoracic aorta was sigmoid in nature and demonstrated the greatest distensibility in the normal physiological systolic blood pressure range of the male Broad Breasted Bronze turkey. Both aortic segments exhibited hysteresis and an isobaric volume change upon successive loading. These phenomena decreased in magnitude with successive loadings.

Evaluation of indirect blood pressure monitoring in awake and anesthetized red-tailed hawks (Buteo jamaicensis): effects of cuff size, cuff placement, and monitoring equipment

“…There is a need to validate common methods of determining IBP in birds as the structure and pressure dynamics of avian blood vessels differ from those of mammals. Avian arteries have a higher resilience (Speckmann & Ringer 1966) and much thicker walls (Bussow 1973) , which may affect how quickly vessels respond to changes in cardiac output and subsequently affect peripheral blood pressures. Research using duck and turkey arteries has demonstrated anatomical differences, compared with mammals, within the arterial wall that allow for increased extension of more elastic lamellae (Smith et al.…”

A biophysical and histological analysis of factors that lead to aortic rupture in normal and lathyritic turkeys

“…Our results, which are summkzed in Table 1, are comparable, although we studied more regions than Speckrnann and Ringer did. In the vessels we succeeded in studying (i.e., all but the upper and lower abdominal aorta of the lathyritlc groups, which were too fragilej, we found that P-APN made the vessels more distensible, as had Speckmann and Ringer (1964). In addition, we showed that both the elastin and collagen parts of the curves ,,K7 wk.…”

“…Berry et al (1974) did not study turkeys, so we cannot conclude whether the differences are due to the species or to our different method of measuring distensibility . Speckmann and Ringer (1964) found that the moduli for thoracic and abdominal aortas s f mature turkeys were (2.2 5 0.11 and 9.55 1 0.30) x 1 0 dynicm2 (1 dyn = 10 pN), and also that lathyrisrn decreased these slightly. Our results, which are summkzed in Table 1, are comparable, although we studied more regions than Speckrnann and Ringer did.…”

“…The heart rate was 2801min in both sexes at 8 weeks but then dropped to 198lmin in the males and 232lmin in the female. These high pressures must increase the stress on the aorta and may lead to rupture (Speakmann and Ringer 1964Ringer , 1966.…”

Avian Physiology

“…The pulse wave velocity in the turkey aorta, based on data of Speckman and Ringer (1966) as calculated by Jones and Johansen (1972), is 4 -6 m/sec for the thoracic aorta and 30 -35 m/sec in the abdominal aorta; the latter value far exceeds such values in mammalian arteries. The pulse wave velocity in the turkey aorta, based on data of Speckman and Ringer (1966) as calculated by Jones and Johansen (1972), is 4 -6 m/sec for the thoracic aorta and 30 -35 m/sec in the abdominal aorta; the latter value far exceeds such values in mammalian arteries.…”