Pentaerythritol trinitrate and glyceryl trinitrate on intramyocardial oxygenation and perfusion in the dog. Krogh analysis of transmural metabolism

Burton B. Howe, Harvey R. Weiss, Sandra B. Wilkes, Martin M. Winbury

Research output: Contribution to journalArticlepeer-review

6 Scopus citations

Abstract

1. The effect of intravenous pentaerythritol trinitrate and glyceryl trinitrate on left ventricular subepicardial (epi) and subendocardial (endo) Po2 and perfusion were compared in anaesthetized open‐chest mongrel dogs. Tissue Po2 was determined simultaneously at a depth of 3 mm (epicardial) and 9 mm (endocardial) with small platinum electrodes by polarography. In a separate series of dogs tissue perfusion of those regions was measured by hydrogen (H2) clearance using similar electrodes. 2. Both nitrates increased endocardial Po2 while epicardial Po2 was not altered. Perfusion was determined at the point of the maximal rise in endocardial Po2 (4–7 min after injection of either nitrate). At that period average coronary artery inflow and epicardial perfusion were decreased but endocardial perfusion was not significantly altered. 3. Using the data on Po2, hydrogen clearance and intercapillary distance, the effect of the nitrates on transmural metabolism (oxygen consumption) was estimated by Krogh analysis. Basal endocardial metabolism was 20–30% higher than epicardial metabolism. The nitrates reduced metabolism in each region. The absolute decrease in oxygen consumption was greater in the endocardium. 4. The results show that both pentaerythritol trinitrate and glyceryl trinitrate improve endocardial oxygenation by producing a more favourable balance between perfusion and oxygen requirements in that region.

Original languageEnglish (US)
Pages (from-to)529-540
Number of pages12
JournalClinical and Experimental Pharmacology and Physiology
Volume2
Issue number6
DOIs
StatePublished - Jan 1 1975
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Physiology
  • Pharmacology
  • Physiology (medical)

Keywords

  • anaesthetized dog
  • hydrogen clearance
  • myocardial oxygen consumption
  • myocardial perfusion
  • nitrates
  • polarography
  • subendocardium
  • subepicardium
  • tissue Po
  • transmural gradients

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