Document Detail

Reduction of blood PO2 decrease and PCO2 increase during asphyxia by paramedian reticular nucleus in cats.
MedLine Citation:
PMID:  1384937     Owner:  NLM     Status:  MEDLINE    
Effects of activation of paramedian reticular nucleus (PRN) on the systemic arterial blood pressure (SAP), heart rate, renal nerve activity (RNA), and changes of the partial pressure of the arterial blood oxygen (PO2) and carbon dioxide (PCO2) during asphyxia were studied in cats anesthetized with chloralose (40 mg/kg) and urethane (400 mg/kg). During a 35-s period of asphyxial anoxia, SAP and RNA increased while heart rate decreased significantly. The arterial blood PO2 decreased by 64.6 +/- 4.7% while the PCO2 increased by 54.6 +/- 6.3%. Electrical stimulation of PRN produced a mild to moderate decrease of the SAP, heart rate, and RNA, but arterial PO2 and PCO2 did not change significantly. When PRN was stimulated simultaneously with asphyxia, increases of SAP and RNA and changes of blood gases subsequent to asphyxia reduced significantly. Arterial PO2 decreased only 54.0 +/- 4.9% while the PCO2 increased 39.4 +/- 10.5% (p < 0.01). Similar effects were observed in the venous blood from inferior vena cava. In addition, when the arteriovenous difference of PO2 and PCO2 was compared, simultaneous PRN stimulation during asphyxia produced a higher PO2 reserve (66.3%) and less PCO2 production (-7%) than without PRN stimulation; PO2 54.2%, PCO2 (-2.9%). The results suggest that PRN is a structure that can exert inhibition over a wide spectrum of body functions; not only autonomic system but probably also metabolism.
J M Yang; C W Ho; R H Lin; R T Lin; M T Lin; T H Yin; C Y Chai
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Brain research bulletin     Volume:  29     ISSN:  0361-9230     ISO Abbreviation:  Brain Res. Bull.     Publication Date:  1992 Nov 
Date Detail:
Created Date:  1992-12-15     Completed Date:  1992-12-15     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  7605818     Medline TA:  Brain Res Bull     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  573-9     Citation Subset:  IM    
Department of Physiology and Biophysics, National Defense Medical Center, Taiwan, R.O.C.
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MeSH Terms
Asphyxia / blood*
Blood Gas Analysis
Blood Pressure / physiology
Carbon Dioxide / blood*
Electric Stimulation
Heart Rate / physiology
Kidney / innervation
Medulla Oblongata / physiology*
Oxygen / blood*
RNA / biosynthesis
Sympathetic Nervous System / physiology
Reg. No./Substance:
124-38-9/Carbon Dioxide; 63231-63-0/RNA; 7782-44-7/Oxygen

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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