Evaluating the Relationship Between Arterial Blood Pressure Changes and Indices of Pulse Oximetric Plethysmography

2002 ◽  
Vol 95 (6) ◽  
pp. 1686-1690 ◽  
Author(s):  
Mohammad Golparvar ◽  
Hossein Naddafnia ◽  
and Mahmood Saghaei
Keyword(s):  
Blood Pressure ◽  
Arterial Blood Pressure ◽  
Arterial Blood ◽  
Pressure Changes ◽  
The Relationship

GRANGER CAUSALITY ANALYSIS BETWEEN INTRA-OSSEOUS PRESSURE AND ARTERIAL BLOOD PRESSURE IN AFRICAN GREY PARROTS (PSITTACUS ERITHACUS)

2021 ◽  
pp. 1-8
Author(s):  
Yi-Tse Hsiao ◽  
Yun-Wen Peng ◽  
Pin Huan Yu
Keyword(s):  
Blood Pressure ◽  
Arterial Pressure ◽  
Granger Causality ◽  
Arterial Blood Pressure ◽  
Pressure Measurement ◽  
Direct Method ◽  
Blood Pressure Measurement ◽  
Rational Approach ◽  
Arterial Blood ◽  
The Relationship

Monitoring blood pressure helps a clinical veterinarian assess various conditions in birds. Blood pressure is not only a bio-indicator of renal or cardiovascular disease but is also a vital indicator for anesthesia. Anesthetic- and sedation-related mortality is higher in birds than dogs or cats. The traditional method of blood pressure measurement in mammals mainly relies on indirect methods. However, indirect blood pressure measurement is not reliable in birds, making the direct method the only gold standard. Although an arterial catheter can provide continuous real-time arterial pressure in birds, the method requires technical skill and is limited by bird size, and is thus not practical in birds with circulatory collapse. Intra-osseous (IO) blood pressure is potentially related to arterial pressure and may be a much easier and safer technique that is less limited by animal size. However, the relationship between IO pressure and arterial blood pressure has not been established. This study used mathematical methods to determine the relationship between IO pressure and arterial blood pressure. The Granger causality (G.C.) theory was applied in the study and used to analyze which pressure signal was leading the other. Our findings suggest that IO pressure is G.C. by arterial blood pressure; thus, the use of IO pressure measurements as an alternative to arterial blood pressure measurement is a rational approach.

Cerebral Autoregulation and Outcome in Acute Brain Injury

2001 ◽  
Vol 2 (3) ◽  
pp. 175-185 ◽  
Author(s):  
Catherine J. Kirkness ◽  
Pamela H. Mitchell ◽  
Robert L. Burr ◽  
David W. Newell
Keyword(s):  
Blood Pressure ◽  
Brain Injury ◽  
Cerebral Autoregulation ◽  
Acute Brain Injury ◽  
Reactivity Index ◽  
Cerebrovascular Pathology ◽  
Arterial Blood ◽  
Score Analysis ◽  
Pressure Changes ◽  
The Relationship

The purpose of this study was to examine the relationship between Czosnyka and others’ Pressure Reactivity Index (PRx) and neurologic outcome in patients with acute brain injury, including traumatic brain injury (TBI) and cerebrovascular pathology. PRx measures the correlation between arterial blood pressure and intracranial pressure waves and may reflect cerebral autoregulation in response to blood pressure changes. A negative PRx reflects intact cerebrovascular response, whereas a positive PRx reflects impaired response. Positive PRx has been shown to correlate with poorer outcome in individuals with TBI, but these findings have not been confirmed by replication in other studies, nor have PRx values been reported for individuals with cerebrovascular pathology. In this study, PRx was determined in 52 patients with TBI (n = 27) or cerebrovascular pathology (n = 25). Hierarchical linear regression was used to evaluate the contribution of PRx to outcome, controlling for age and Glasgow Coma Scale score. Analysis of all subjects together did not support the previously reported relationship between PRx and outcome. However, for those with TBI, positive PRx was a significant predictor of negative outcome (P = 0.03). For those with cerebrovascular pathology, the effect was not significant (P = 0.10) and was in the opposite direction. For individuals with TBI, PRx may provide useful information related to cerebral autoregulation that is predictive of outcome. The meaning of PRx in individuals with cerebrovascular pathology is unclear, and further study is needed to examine the paradoxical findings observed.

The relationship between resting arterial blood pressure and oral postsurgical pain

2014 ◽  
Vol 19 (6) ◽  
pp. 1299-1305 ◽  
Author(s):  
Christophe Deschaumes ◽  
Laurent Devoize ◽  
Yannick Sudrat ◽  
Martine Baudet-Pommel ◽  
Christian Dualé ◽  
...  
Keyword(s):  
Blood Pressure ◽  
Arterial Blood Pressure ◽  
Postsurgical Pain ◽  
Arterial Blood ◽  
The Relationship

Ouabain prevents loss of autoregulation in rat pial arterioles caused by reoxygenation after a brief hypoxic episode

1989 ◽  
Vol 67 (5) ◽  
pp. 423-427 ◽  
Author(s):  
J. Kettler ◽  
B. Y. Ong ◽  
D. Bose
Keyword(s):  
Blood Pressure ◽  
Arterial Blood Pressure ◽  
Protective Effects ◽  
Cranial Window ◽  
Arterial Blood ◽  
Hypoxic Episode ◽  
Electrogenic Sodium Pump ◽  
Before And After ◽  
Pressure Changes ◽  
Arteriolar Diameter

Pial arteriolar diameter changes inversely with changes in systemic arterial blood pressure. Such changes are consistent with autoregulatory functions. These responses are reduced by a brief period of hypoxia followed by reoxygenation. By using an open cranial window preparation we assessed the changes in pial arteriolar diameters during blood pressure changes in rats induced by hemorrhage and reinfusion of blood, before and after a brief period of hypoxia. The slopes of the changes in pial arteriolar diameter as a function of mean arterial blood pressure were −0.47 ± 0.26 μm/mmHg (mean ± SD; 1 mmHg = 133.3 Pa) before hypoxia and −0.11 ± 0.23 μm/mmHg after hypoxia in the untreated rats. In ouabain-treated rats, corresponding slopes were −0.42 ± 0.24 and −0.46 ± 0.22 μm/mmHg. The observed protective effects of ouabain might be a blockade of the Na–K pump in the sarcolemma of the vascular smooth muscle.Key words: vascular smooth muscle, electrogenic sodium pump, metabolic inhibition.

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