Unilateral Extradural Blockade In
نویسنده
چکیده
Sir,—The hypothesis advanced by Narang and Linter [1] concerning the cause of unilateral extradural blockade is intriguing. However, I must take exception to their mathematics. Using the data from their table I, I have calculated the percentage of unsatisfactory blocks at each S—EDS (skin— extradural space distance) (table I). Spearmans rank correlation remains the same, but the authors' statement that there is a greater than 40 % chance of producing an unsatisfactory block if the extradural space has not been identified before a depth of 6 cm, must be challenged. Calculations from their data (table I) put this figure at 33.7%.
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