Ischaemia, action potentials, and refractoriness
نویسندگان
چکیده
منابع مشابه
Ischaemia, action potentials, and refractoriness.
The study by Sutton and colleagues in this issue is the first to measure in humans the changes in the left ventricular refractory period and the duration of the ventricular monophasic action potential during the first minutes of acute ischaemia. 1 As the authors mention, the experimental data on this subject are rather confusing. Most studies report on a shortening of the refractory period, but...
متن کاملRepolarisation and refractoriness during early ischaemia in humans.
OBJECTIVES To determine whether effective refractory period (ERP) shortens or lengthens in the first minutes of ischaemia in humans, and the relation between ERP changes and action potential duration (APD). METHODS ERP and monophasic action potential duration (MAPD) were measured from a single left ventricular epicardial site in 26 patients undergoing coronary artery surgery. Cardiopulmonary ...
متن کاملMembrane Potentials and Action Potentials
Electrical potentials exist across the membranes of virtually all cells of the body. In addition, some cells, such as nerve and muscle cells, are capable of generating rapidly changing electrochemical impulses at their membranes, and these impulses are used to transmit signals along the nerve or muscle membranes. In other types of cells, such as glandular cells, macrophages, and ciliated cells,...
متن کاملAction Potentials'
lntracellular Caz+, K+, CI-, and NOsactivities were measured with ion-selective microeledrodes in the liverwort Conocephalum conicum 1. at rest, during dark/light changes, and in the couese of adion potentials triggered by light or electrical stimuli. l h e average free cytosolic Caz+ concentration was 231 f 65 nM. We did not observe any light-dependent changes of the free cytosolic Caz+ concen...
متن کاملFacilitation and refractoriness of the electrically evoked compound action potential
In this study we aim to resolve the contributions of facilitation and refractoriness at very short pulse intervals. Measurements of the refractory properties of the electrically evoked compound action potential (ECAP) of the auditory nerve in cochlear implant (CI) users at inter pulse intervals below 300 μs are influenced by facilitation and recovery effects. ECAPs were recorded using masker pu...
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ژورنال
عنوان ژورنال: Heart
سال: 2000
ISSN: 0007-0769
DOI: 10.1136/heart.84.4.363