Читать книгу Neurosyphilis. Modern Systematic Diagnosis and Treatment Presented in One Hundred and Thirty-Seven Case Histories онлайн

56 страница из 85

3. What is the percentage of cases of paretic neurosyphilis that show a negative serum W. R.? Among the best figures are those of Müller, who found that of 386 examples of paretic neurosyphilis, 379 showed all reactions positive, or 98.5%.

4. What is the meaning and value of the so-called provocative salvarsan injection? In practice, there may be a series of negative W. R.’s in the blood serum before a positive reaction is finally obtained, owing to technical difficulties or biological peculiarities. Where intensive work is being done upon the neurosyphilis problem, it is beyond question desirable to make the W. R. test upon at least three separate samples of blood drawn at intervals, for the second or third test may prove positive. This situation makes the interpretation of the so-called provocative salvarsan injection exceedingly doubtful; that is, the reaction might have been positive on repetition without the injection of salvarsan. The present case, as above stated, failed to yield a serum W. R. even after repeated tests and the “provocative.”