| contraction b. |
one of the bands seen by light microscopy in fully contracted muscle on either side of the Z band, caused by distortion of the ends of the myosin filaments by the Z band.
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| contraction band n. |
a cardiac lesion seen in patients with neurologically induced cardiographic changes, in myocardial biopsy specimens, and in cocaine or epinephrine toxicity, characterized by hypercontracted myofibrils with contraction bands and mitochondrial damage; it is caused by calcium ion influx into dying cells, which results in the arrest of cells in the contracted state, following severe ischemia and subsequent reperfusion. Called also coagulative myocytolysis.
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| contraction f.’s |
brief, rhythmic twitching of a muscle during weak voluntary or postural contractions; seen in some elderly patients and those with neurogenic muscle atrophy.
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| contraction r. |
see constriction r. and retraction r.
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| contraction stress t. |
the monitoring of the response of the fetal heart rate to uterine contractions by cardiotocography; uterine contractions may be spontaneous or induced by maternal nipple stimulation or by intravenous infusion of oxytocin (oxytocin challenge test). A negative (normal) test consists of three contractions within a 10-minute period with no deceleration of the fetal heart rate; a late deceleration pattern may reflect fetal hypoxia. Click here to view image■Contraction stress test. The top tracing of each pair shows the fetal heart rate; the bottom shows uterine contractions. (A), A negative (normal) result, with uterine contractions followed by an unchanged fetal heart rate. (B), A positive result, showing late deceleration with uterine contractions.
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