Library

feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Pflügers Archiv 407 (1986), S. 625-631 
    ISSN: 1432-2013
    Keywords: Guinea pig ; Colon ; Potassium ; Microclimate ; Mucus layer ; Preepithelial barrier
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract K+ concentrations were measured with K+ sensitive liquid ion exchanger microelectrodes in situ and in vitro in the mucus layer at the luminal cell surface of the proximal and the distal colon in guinea pig. In a first series of experiments K+ concentrations were increased in the luminal solution from 0 to 70 mmol·l−1; the serosal K+ concentrations were kept in vitro at 5.4 mmol·l−1. In the proximal colon mean K+ concentration in the microclimate was in vitro 7.9±3.5 mmol·l−1, and independent from mucosal concentrations. In the distal colon in vitro, and in situ in the proximal as well as in the distal colon, K+ concentrations in the microclimate were increased slightly when K+ concentrations were elevated in the luminal solution up to 70 mmol·l−1. In a second series of in vitro studies K+ concentrations were also altered in the serosal fluid. In the proximal and in the distal colon K+ concentrations increased linearily with elevated K+ concentrations in the serosal solutions. A temporarily interrupted mucosal blood flow resulted in a significant increase in the K+ concentration in the microclimate. A paracellular shunt pathway and a high preepithelial diffusion barrier for K+ would explain the observed K+ concentrations in the microclimate at the luminal cell surface.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Monatsschrift Kinderheilkunde 144 (1996), S. 1352-1356 
    ISSN: 1433-0474
    Keywords: Schlüsselwörter Persistierende pulmonale Hypertonie des Neugeborenen (PPHN) ; Oxygenierung ; Stickoxid (NO) ; Atemnotsyndrom (HMD) ; Response ; Key words Persistent pulmonary hypertension of the newborn (PPHN) ; Oxygenation ; Nitric oxide (NO) ; Hyaline membrane disease (HMD) ; Responder
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary Critical hypoxemia due to extrapulmonary right-to-left-shunting is a typical feature of neonates with persistent pulmonary hypertension of the newborn (PPHN). To improve oxygenation, inhaled nitric oxide (NO) has been used for the last three years in neonatal intensive care units during mechanical ventilation, thus lowering pulmonary vascular resistance. However, sustained improvement in oxygenation is only noted in one third up to two fifths of treated newborns (responders) if PPHN develops due to primary pulmonary disease. NO has only been used for term neonates until recently, when a growing interest for its administration in preterm babies with hyaline membrane disease (HMD) came up. Since intrapulmonary right-to-left shunting is the main reason for hypoxia in HMD, inhaled NO should prove to be a potent selective pulmonary vasodilator in future studies. Further clinical and experimental studies with animals will be helpful to evaluate the individual newborn as being a potential responder or nonresponder.
    Notes: Zusammenfassung Die hochgradige Oxygenierungsstörung durch extrapulmonale Rechts-links-Shunts ist ein typisches Merkmal bei Neugeborenen mit persistierender pulmonaler Hypertonie (PPHN). Zur Verbesserung der Oxygenierung wird seit ca. 3 Jahren in neonatologischen Zentren Stickoxid (NO) während der maschinellen Beatmung inhalativ zur Senkung des pulmonalen Gefäßwiderstands verabreicht. Nur 1/3–2/5 der behandelten Neugeborenen reagiert mit einer anhaltenden Verbesserung der Oxygenierung (Responder), wenn eine primär pulmonal-parenchymatöse Erkrankung mit sekundärer PPHN vorliegt. Wurde NO aus toxikologischen Erwägungen bisher fast ausschließlich bei reifen Neugeborenen angewendet, so hat sich jüngst ein Interesse für den Einsatz bei Frühgeborenen mit Atemnotsyndrom (HMD) entwickelt. Da der intrapulmonale Rechts-links-Shunt jedoch die wesentliche Ursache der Oxygenierungsstörung bei Frühgeborenen mit HMD ist, sollten zukünftige Studien die Anwendung von NO als potenten, selektiven pulmonalen Vasodilator in der Lungenstrombahn des Frühgeborenen rechtfertigen. Weitere klinische und tierexperimentelle Studien sind notwendig, um das individuelle Neugeborene als potentiellen Responder oder Nonresponder einschätzen zu können.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...