Protective effect of pretreatment with the calcium antagonist anipamil on the ischemic-reperfused rat myocardium: a phosphorus-31 nuclear magnetic resonance study

Journal Article · Sun May 01 00:00:00 EDT 1988 · J. Am. Coll. Cardiol.; (United States)

DOI:https://doi.org/10.1016/S0735-1097(98)90069-9· OSTI ID:6945695

Kirkels, J H; Ruigrok, T J; Van Echteld, C J; Meijler, F L

To assess whether the prophylactic administration of anipamil, a new calcium antagonist, protects the heart against the effects of ischemia and reperfusion, rats were injected intraperitoneally twice daily for 5 days with 5 mg/kg body weight of this drug. The heart was then isolated and perfused by the Langendorff technique. Phosphorus-31 nuclear magnetic resonance spectroscopy was used to monitor myocardial energy metabolism and intracellular pH during control perfusion and 30 min of total ischemia (37/sup 0/C), followed by 30 min of reperfusion. Pretreatment with anipamil altered neither left ventricular developed pressure under normoxic conditions nor the rate and extent of depletion of adenosine triphosphate (ATP) and creatine phosphate during ischemia. Intracellular acidification, however, was attenuated. On reperfusion, hearts from anipamil-pretreated animals recovered significantly better than untreated hearts with respect to replenishment of ATP and creatine phosphate stores, restitution of low levels of intracellular inorganic phosphate and recovery of left ventricular function and coronary flow. Intracellular pH recovered rapidly to preischemic levels, whereas in untreated hearts a complex intracellular inorganic phosphate peak indicated the existence of areas of different pH within the myocardium. It is concluded that anipamil pretreatment protects the heart against some of the deleterious effects of ischemia and reperfusion. Because this protection occurred in the absence of a negative inotropic effect during normoxia, it cannot be attributed to an energy-sparing effect during ischemia. Therefore, alternative mechanisms of action are to be considered.

• Research Organization: Interuniversity Cardiology Institute, Utrecht (The Netherlands)
• OSTI ID: 6945695
• Journal Information: J. Am. Coll. Cardiol.; (United States), Vol. 11:5
• Country of Publication: United States
• Language: English

Related Subjects

59 BASIC BIOLOGICAL SCIENCES
ISCHEMIA
PATHOGENESIS
PORINS
BIOLOGICAL EFFECTS
ATP
ENZYME INHIBITORS
INTRAPERITONEAL INJECTION
MYOCARDIUM
NUCLEAR MAGNETIC RESONANCE
PERFUSED ORGANS
PHOSPHATES
PHOSPHORUS 31
RATS
ANIMALS
BODY
CARDIOVASCULAR DISEASES
CARDIOVASCULAR SYSTEM
DISEASES
HEART
INJECTION
INTAKE
ISOTOPES
LIGHT NUCLEI
MAGNETIC RESONANCE
MAMMALS
MEMBRANE PROTEINS
MUSCLES
NUCLEI
NUCLEOTIDES
ODD-EVEN NUCLEI
ORGANIC COMPOUNDS
ORGANS
OXYGEN COMPOUNDS
PHOSPHORUS COMPOUNDS
PHOSPHORUS ISOTOPES
PROTEINS
RESONANCE
RODENTS
STABLE ISOTOPES
VASCULAR DISEASES
VERTEBRATES
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