August 1988
Volume 29, Issue 8
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Articles  |   August 1988
Length-tension curves of human eye muscles during succinylcholine-induced contraction.
Author Affiliations
  • H J Simonsz
    Augenklinik für Schielbehandlung und Neuroophthalmologie, Klinikum der Justus-Liebig-Universität, Giessen, West Germany.
  • G H Kolling
    Augenklinik für Schielbehandlung und Neuroophthalmologie, Klinikum der Justus-Liebig-Universität, Giessen, West Germany.
  • B van Dijk
    Augenklinik für Schielbehandlung und Neuroophthalmologie, Klinikum der Justus-Liebig-Universität, Giessen, West Germany.
  • H Kaufmann
    Augenklinik für Schielbehandlung und Neuroophthalmologie, Klinikum der Justus-Liebig-Universität, Giessen, West Germany.
Investigative Ophthalmology & Visual Science August 1988, Vol.29, 1320-1330. doi:
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    • Get Citation

      H J Simonsz, G H Kolling, B van Dijk, H Kaufmann; Length-tension curves of human eye muscles during succinylcholine-induced contraction.. Invest. Ophthalmol. Vis. Sci. 1988;29(8):1320-1330.

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      © ARVO (1962-2015); The Authors (2016-present)

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Abstract

We have made intraoperative, continuous-registration, length-tension diagrams of detached eye muscles in 80 strabismus patients under general anaesthesia. In 47 of these we repeated the measurements after contraction evoked by succinylcholine chloride. In contracting horizontal and vertical rectus muscles, we found a linear relation between length and tension. In contracting oblique muscles, however, the relation between length and tension was frequently nonlinear. In superior oblique palsies, the superior oblique was found to be stiff after elongation and before injection of succinylcholine, and it did not contract after injection of succinylcholine. The ipsilateral inferior oblique did contract after injection of succinylcholine, but with a higher spring constant than usual (ie, contracture of the ipsilateral antagonist). In three cases the superior oblique contracted vividly after administration of succinylcholine despite the presence of excyclotropia, stereopsis, torticollis (two cases) and a hypertropia that increased in adduction, in down-gaze, in adduction and down-gaze and on ipsilateral head-tilt. In a case of general fibrosis syndrom we found almost normally contracting vertical recti, which is compatible only with a supranuclear or misdirectional cause. These cases demonstrate the usefulness of the assessment of the length-tension diagram of an eye muscle during surgery, before and during contraction evoked by succinylcholine chloride.

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