Mechanism of postextrasystolic potentiation in the right ventricle


     Related Videos
Ankylosing Spondylitis MECHANISM
Gleevecs mechanism of Action
AZT s Mechanism of Antiviral Activity
New Irrigation Technology for Endoscopy / Ureteroscopy - Mounting Mechanism
WCRS 6 Jurisdictional Issues and Trigger Mechanism - Panel 3

     Related Hubpages

    Field: Medicine  DOWNLOAD  BOOKMARK REPORT
    •  Doc. Url:    Embed Code: 
      ' onClick="javascript:document.code.embedded.focus();document.code.embedded.select();" readonly />

    • PubMed  status
      (0) (0 Votes)
      		Views: (1023)   Date: (27-01-09)   Pages: ()

    • Author:  Dell'Italia LJ.  

    • Abstract:  Mechanism of postextrasystolic potentiation in the right ventricle. Dell'Ita lia LJ. Department of Medicine, University of Texas Health Science Center, San Antonio. The mechanism of postextrasystolic potentiation (PESP) has been studied in the left ventricle in humans; however, this phenomenon has not been evaluated in the right ventricle. Accordingly, 18 sinus beats were compared to postextrasystolic beats during the same cineventriculogram using simultaneous high-fidelity right ventricular (RV) and pulmonary artery pressures and cast-validated biplane cineventriculographi c volumes in normal patients. The increase in cycle length was 22 +/- 12% (standard deviation) in the postextrasystolic beats. Right ventricular ejection fraction increased from 61 +/- 10 to 68 +/- 4% (p less than 0.001) and RV stroke volume increased from 99 +/- 18 to 128 +/- 20 ml (p less than 0.001) due to an increase in RV end-diastolic volume (165 +/- 34 to 189 +/- 30 ml, p less than 0.001) as RV end-systolic volume (65 +/- 24 to 61 +/- 17 ml, difference not significant) and RV end-systolic pressure (16 +/- 7 to 17 +/- 6 mm Hg, difference not significant) remained unchanged. Despite an increase in RV systolic pressure from 29 +/- 7 to 31 +/- 7 mm Hg (p less than 0.01) and an increase in RV end-diastolic pressure from 8 +/- 4 to 10 +/- 5 mm Hg (p less than 0.001), RV +dP/dtmax did not change (318 +/- 102 to 294 +/- 82 mm Hg/s, difference not significant).(ABSTRA CT TRUNCATED AT 250 WORDS) PMID: 1690502 [PubMed - indexed for MEDLINE]

         Related Documents

           Related Groups

             Related Science News

               More on Sciencestage

                 Answers

                 News
            • New defense mechanism against viruses and cancer identified
              Scientists have found a fundamentally new mechanism how our defense system is ramped up when facing a viral intruder. Exploitation of this mechanism in vaccines sparks new hope for better prevention and therapy of infectious diseases and cancer.
            • Researchers identify new mechanism for iron absorption
              The "groundbreaking" study – published in The Journal of Nutrition – is reportedly the first to uncover the existence of at least two independent mechanisms for iron absorption from non-meat source – offering a potential new treatment for iron deficiency using the legume based ferritin.
            • Alert Mechanism Report on macroeconomic imbalances in EU Member States - guide
              The EU’s new rules on economic governance, the so-called "six-pack" has two legs: fiscal and macroeconomic surveillance. The macroeconomic imbalances procedure is a new tool that helps detect and correct risky economic developments.
            • What is an ETF? — The Arbitrage Mechanism
              Exchange traded funds have a so-called arbitrage mechanism that helps keep share prices in line with the value of the underlying securities or assets.Arbitrage is the practice of taking advantage of a ...
            • Petrojam pricing mechanism under review
              THE mechanism employed by Petrojam for calculating the price of petroleum products is currently under review by the government, a senior source in the Ministry of Science, Technology, Energy and Mining has disclosed.
            • Mechanism of planet formation studied
              LIVERMORE, Calif., Feb. 10 (UPI) -- Phase changes in liquid magmas at pressures and temperatures deep inside Earth-like planets may be a factor in planet formation, U.S. researchers say.
            • MolecularHealth and FDA to Collaborate on Analytical Tools for Mechanism-Based Drug Safety Assessment
              NEW YORK, Feb. 14, 2012 /PRNewswire/ -- MolecularHealth, Inc., a leader in clinico-molecular informatics™, today announced the establishment of a five-year research collaboration agreement with the U.S. ...
            • Joint mechanism formed to protect overseas Chinese
              China has set up a joint mechanism involving its diplomatic and consular missions and companies operating overseas to provide consular protection, said a statement issued here Friday by the Department of Consular Affairs of the Foreign Ministry.
            • Why should I care about 1 Care?
              (The Malaysian Insider) - When the idea of a national health financing mechanism came up in the mid-2000s, the question of how the funding scheme would be implemented caused much concern. Sharmini Darshni As a journalist then with an interest in public health issues, I followed the arguments made, then observed how the idea of “the rich paying for the poor” disappeared. Logic suggests that the ...
            • Cris Carter says Randy Moss has huge ‘quit mechanism’
              Randy Moss announced Monday that he was interested in returning to the NFL, and outspoken ex-teammate Cris Carter took to the airwaves to denigrate the receiver.

                 Related on Wikipedia




























               

              Powered free by PHPmotion