Clinical Neuroscience

[Remembering Jendrassik]

L. Van Bogaert

JANUARY 01, 1959

Clinical Neuroscience - 1959;12(01)

[The author reconstructs from Jendrassik's original works the facts he discovered and the doctrines he expounded - to see what later works, and especially modern genetic research, have been able to draw on. ]



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Clinical Neuroscience

[Clinical and pathopsychological observations in 25 cases of subacute progressive panencephalitis]


[Author concludes from clinical and pathopsychological examination of 25 cases of subacute progressive penencephalitis: 1. the EEG greatly facilitates early diagnosis; 2. in the majority of cases, the onset of the disease occurred in the autumn-winter months; 3. regionally, the western counties play the most important role, except in the capital; 4. found the 8-9 age group to be the most at risk, with an even gender distribution; 5. from the succession of pathopsychological examinations and the symptomatic picture, he concludes that the process starts in the perietoccipital region and progresses from the back to the front; 6. in terms of clinical type, the van Bogaert-type course is the most frequent, but many transient forms have also been observed. ]

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Clinical Neuroscience

[Recurrent inhibition during Jendrassik maneuver]


[Objective – Conflicting theoretical models exist regarding the mechanism related to the ability of the Jendrassik maneuver to reinforce reflex parameters. Our objective was to investigate if vigorous handgrip would induce changes in recurrent inhibition of soleus motoneurons. Method – Soleus H reflex was evoked by stimulating the tibial nerve at rest and during bilateral vigorous handgrip, alternating single (H1) and paired stimulation (H2). At paired stimulation we used interstimulus intervals of 10, 15, 20 and 25 ms and supramaximal test stimulus. H1- and H2-wave amplitudes were expressed as percentage of maximal M-wave amplitude. Conditioned H2 wave maximal (H2max) and minimal (H2) amplitudes evoked at rest and expressed as a percentage of the unconditioned H1max amplitude were compared with the corresponding values obtained during handgrip by means of paired Student test and Bonferroni correction. Subjects – At the study participated 28 healthy volunteers. Results – The H1max/Mmax × 100 values obtained during handgrip (37.5±10.1) were significantly higher than those obtained at rest (27.1±7.4). The H2max/H1max × 100-va­lues obtained at paired stimulation were significantly higher during handgrip than at rest, while no significant diffe­rence was found between the H2/H1max × 100-values obtained during handgrip and at rest respectively. Discussion – The H2max/H1max is determined by both the excitability of the motoneurons and the recurrent inhibition elicited by the conditioning stimulus, while H2/H1max indicates only the level of recurrent inhibition. According to our results the Renshaw cells retain their inhibitory effect on the soleus alpha motoneurons during remote muscle contraction. Conclusion – Soleus H reflex enhancement during Jendrassik maneuver is not due to decrease of recurrent inhibition. ]

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