title: Human parietal pleura present electrophysiology variations according to location in pleural cavity.
abstract: The aim of the study was to investigate if human pleura from different anatomical locations presents electrophysiology differences. Specimens were stripped over the 2nd-5th rib (cranial), 8th-10th rib (caudal), and mediastinum during open surgery and were mounted between Ussing chambers. Amiloride and ouabain were added towards mesothelial surface and trans-mesothelial potential difference (PD) was measured after 1, 5, 10 and 20 min. Trans-membrane resistance (R) was calculated from Ohm's law. R increased after amiloride addition, for cranial (net increase of 0.40 Omega x cm(2)) and caudal (1.16 Omega x cm(2)) pleural pieces. Mediastinal pleura R remained unchanged (0.09 Omega x cm(2)). R increase was higher for caudal than cranial (P=0.029) or mediastinal tissues (P=0.002). R increased after ouabain addition for caudal (1.35 Omega x cm(2)) and cranial (0.56 Omega x cm(2)) pleural pieces. Mediastinal pleural tissue did not respond (0.20 Omega x cm(2)). Caudally located pleura responded greater than cranial (P=0.043) or mediastinal (P=0.003) pleural tissues. Human pleura shows electrophysiology differences according to the location within the pleural cavity. Surgeons may waste mediastinal pleura when needed but should leave intact caudal parietal pleura, which seems to be electrophysiologically the most important part of the pleural cavity.
authors.affiliation: Department of Physiology, University of Thessaly Medical School, Milou 28, 413 35 Larissa, Greece. kouritas@otenet.gr
authors.forename: Vassilios K
authors.initials: VK
authors.lastname: Kouritas
authors.forename: Chrisi
authors.initials: C
authors.lastname: Hatzoglou
authors.forename: Christophoros N
authors.initials: CN
authors.lastname: Foroulis
authors.forename: Konstantinos I
authors.initials: KI
authors.lastname: Gourgoulianis
mesh_terms: D000584:Amiloride / Q000494:pharmacology; D017097:Electric Impedance; D004791:Enzyme Inhibitors / Q000494:pharmacology; D004848:Epithelium / Q000187:drug effects / Q000201:enzymology / Q000378:metabolism* / Q000601:surgery; D006801:Humans; D008482:Mediastinum; D008564:Membrane Potentials; D010042:Ouabain / Q000494:pharmacology; D010539:Permeability; D010994:Pleura / Q000187:drug effects / Q000201:enzymology / Q000378:metabolism* / Q000601:surgery; D035422:Pleural Cavity; D012272:Ribs; D026941:Sodium Channel Blockers / Q000494:pharmacology; D000254:Sodium-Potassium-Exchanging ATPase / Q000037:antagonists & inhibitors / Q000378:metabolism
chemical_list: D004791:Enzyme Inhibitors; D026941:Sodium Channel Blockers; D010042:Ouabain; D000584:Amiloride; D000254:Sodium-Potassium-Exchanging ATPase