Mechanical properties and dimensions of the major pulmonary arteries

Patel, Dali J.; Schilder, Donald P.; Mallos, Alexander J.

doi:10.1152/jappl.1960.15.6.1172-s

Cited by 15 publications

(26 citation statements)

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“…This value seems to be in the vicinity of 40 mm Hg of mPAP (data not shown) or 60 mm Hg of sPAP (Fig. 2D), in agreement with previous invasive data (8,39). Although the reasons for this curvilinear relationship are likely complex and beyond the scope of our investigation, it has been postulated that this is related to the progressive recruitment of nondistensible collagen versus elastin fibers at increasing degrees of deformation (40).…”

Section: Discussionsupporting

confidence: 91%

Evaluation of Pulmonary Artery Stiffness in Pulmonary Hypertension With Cardiac Magnetic Resonance

Sanz

Kariisa

Dellegrottaglie

et al. 2009

JACC: Cardiovascular Imaging

284

234

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Section: Discussionsupporting

confidence: 91%

Evaluation of Pulmonary Artery Stiffness in Pulmonary Hypertension With Cardiac Magnetic Resonance

Sanz

Kariisa

Dellegrottaglie

et al. 2009

JACC: Cardiovascular Imaging

284

234

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“…The cross section is therefore not circular and hence we used the approximation formula for the area of an ellipse (-ab) for the calculation of the cross section, where a and b are the major and minor semiaxes of the ellipse. This, and the higher perfusion pressures employed by Patel et al, 19 may account for the fact that our values are considerably lower than those figure 11. Distances are measured from pulmonary artery valves either to the various branch points (first five rows) or to the end of the longest lobar branch in each of the 12 oasts.…”

Section: Figure 10contrasting

confidence: 54%

Pressure Transmission in Pulmonary Arteries Related to Frequency and Geometry

Attinger

1963

Circulation Research

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The propagation of the pulse wave through the canine pulmonary arterial tree has been evaluated by means of harmonic analysis. The apparent phase velocity varied both with frequency and distance as one would expect in the presence of reflected waves. The phase velocity was about 230 cm/sec for the inflated and 325 cm/sec for the deflated lung. Theoretical considerations as well as experimental results indicate that the major branches represent the primary reflection site for the pulse wave. The pulse pressure is transmitted across the pulmonary capillary bed, although at a high attenuation, and the transmission varies markedly with lung volume. The dimensions of the pulmonary arterial tree were evaluated from casts. Data for the length and cross sections of the various branches are given. The volume of the arterial tree as represented by the casts was 24 ml. The cross section of the various branches represents an ellipse rather than a circle, and the cross section ratios of the major branch points is considerably less than those postulated for optimal energy transfer. The implications of the geometrical findings for the relation between pressure gradient and flow are briefly discussed.

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“…Our results show that dobutamine does not affect the PVZ spectrum, except for a shift of Ppa/Q moduli to higher frequencies, which might be attributed to an increased heart rate (12). Administration of norepinephrine has been shown to decrease pulmonary artery distensibility independently of the level of intravascular pressure (28), and stimulation of the stellate ganglion in dogs has been reported to increase Zc without associated change in PVR (29), suggesting an ␣-adrenergic receptor-mediated decrease in pulmonary arterial compliance. The present results indicate that dobutamine up to 20 g·kg Ϫ1 ·min Ϫ1 has no such effects on the pulmonary circulation.…”

Section: Discussionmentioning

confidence: 99%