Distribution of ventilation and perfusion

2012 ◽  
pp. 107-116
Keyword(s):  
Ventilation And Perfusion

Unilateral Absence of Ventilation and Perfusion Due to Thoracic Aortic Aneurysm

1988 ◽  
Vol 13 (12) ◽  
pp. 880-882 ◽  
Author(s):  
ROBERT A. DUKE ◽  
MILTON R. BARRETT ◽  
JAMES D. MASSIE ◽  
JORGE E. SALAZAR ◽  
MORRIS L. GAVANT ◽  
...  
Keyword(s):  
Aortic Aneurysm ◽  
Thoracic Aortic Aneurysm ◽  
Ventilation And Perfusion

Contribution of Ventilation and Perfusion Lung Imaging to the Management of Patients With Bronchiectasis

1994 ◽  
Vol 19 (4) ◽  
pp. 292-297 ◽  
Author(s):  
MOH??D K. H. MOHAMADIYEH ◽  
MR M ASHOUR ◽  
MAHMOUD EL-DESOUKI ◽  
SULAIMAN A. AL-MAJED
Keyword(s):  
Lung Imaging ◽  
Ventilation And Perfusion

Postural change in ventilation and perfusion secondary to a thoracic scoliosis with complete resolution after surgery

2009 ◽  
Vol 82 (979) ◽  
pp. e137-e140 ◽  
Author(s):  
T D BARWICK ◽  
I GODDARD ◽  
M EASTY ◽  
C WALLIS ◽  
L BIASSONI
Keyword(s):  
Complete Resolution ◽  
Postural Change ◽  
Thoracic Scoliosis ◽  
Ventilation And Perfusion

Co-registration of acquired MR ventilation and perfusion images?Validation in a porcine model

2002 ◽  
Vol 49 (1) ◽  
pp. 13-18 ◽  
Author(s):  
Rahim R. Rizi ◽  
Punam K. Saha ◽  
Binquan Wang ◽  
Margaret A. Ferrante ◽  
David Lipson ◽  
...  
Keyword(s):  
Porcine Model ◽  
Ventilation And Perfusion

Effect of inspired CO2 on ventilation and perfusion heterogeneity in hyperventilated dogs

1993 ◽  
Vol 75 (3) ◽  
pp. 1306-1314 ◽  
Author(s):  
K. B. Domino ◽  
E. R. Swenson ◽  
N. L. Polissar ◽  
Y. Lu ◽  
B. L. Eisenstein ◽  
...  
Keyword(s):  
Standard Deviation ◽  
Partial Pressure ◽  
Respiratory Rate ◽  
Dead Space ◽  
Pressure Difference ◽  
Inert Gas ◽  
Ventilation Distribution ◽  
Pentobarbital Sodium ◽  
Ventilation And Perfusion ◽  
Paco2 Level

We studied the effect of inspired CO2 on ventilation-perfusion (VA/Q) heterogeneity in dogs hyperventilated under two different tidal volume (VT) and respiratory rate conditions with the use of the multiple inert gas elimination technique. Dogs anesthetized with pentobarbital sodium were hyperventilated with an inspired fraction of O2 of 0.21 by using an increased VT (VT = 30 ml/kg at 18 breaths/min) or an increased respiratory rate (VT = 18 ml/kg at 35 breaths/min). The arterial CO2 tension (PaCO2) was varied to three levels (20, 35, and 52 Torr) by altering the inspired PCO2. The orders of type of ventilation and PaCO2 level were randomized. Compared with normocapnia, VA/Q heterogeneity was increased during hypocapnia induced by increased respiratory rate ventilation, which was indicated by an increase in dispersion indexes and arterial-alveolar inert gas partial pressure difference areas (P < 0.01). In contrast, VA/Q heterogeneity was not affected by hypocapnia when a large VT ventilation was used. Under the conditions of our study, hypercapnia did not result in statistically significant changes in VA/Q heterogeneity with either type of ventilation. Increased VT ventilation reduced dead space at all PaCO2 levels (P < 0.01) and reduced the log standard deviation of the ventilation distribution during normocapnia (P < 0.05) and hypocapnia (P < 0.01). We conclude that hypocapnia increased VA/Q heterogeneity when hyperventilation was achieved with a rapid respiratory rate. Therefore, a lack of improvement in VA/Q matching with inhaled CO2 may be associated with the use of a large VT. These data suggest that hypocapnic bronchoconstriction may be important in mediating hypocapnia-induced VA/Q inequality in dogs.

Coregistered Ventilation and Perfusion SPECT Using Krypton-81m and Tc-99m−Labeled Macroaggregated Albumin With Multislice CT

2007 ◽  
Vol 14 (7) ◽  
pp. 830-838 ◽  
Author(s):  
Yoshiharu Ohno ◽  
Hisanobu Koyama ◽  
Daisuke Takenaka ◽  
Munenobu Nogami ◽  
Yoshikazu Kotani ◽  
...  
Keyword(s):  
Multislice Ct ◽  
Macroaggregated Albumin ◽  
Perfusion Spect ◽  
Ventilation And Perfusion
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