James A. Donaldson

Electronystagmographic and audiologic findings in patients with meniere's disease

Electronystagmographic (ENG) and audiologic findings were reviewed for 206 patients treated for Menieres disease (MD) at the University of Washington Hospital over a 10-year period (1971-80). The most frequently seen ENG findings were unilateral caloric weakness (UW) in 49%, directional preponderance (DP) in 36%, and spontaneous and/or positional nystagmus (SN, PN) in 32%. ENG was normal in 25%. Bilateral caloric weakness (BW) occurred in 36% of patients with bilateral hearing loss. UW was reliably correlated with the side of audiometric involvement; after exclusion of bilateral cases, only 3% of patients showed UW contralateral to the ear with hearing los. Neither DP nor direction of SN or PN correlated at all with side of hearing loss. There was no significant correlation of severity of hearing loss (by pure-tone thresholds or speech discrimination score) with ENG abnormality (UW or DP). Glycerol-positive patients had significantly poorer hearing than glycerol-negative patients, but ENG findings were similar in the two groups.

Surgical Anatomy of the Chorda Tympani

The present report is based upon the following: dissection of both unembalmed and skeletal (“cleaned”) * specimens; selected Ievels in two series of sectioned temporal bones ( 17 and 19 years of age). In addition, the set of illustrations is introduced by a schematized treatment of the source, neural connections and relationships of the chorda tympani and terminated with a drawing of an undissected specimen so viewed as to show channels and sulci which traverse or indent the temporal bone.

The abstract Cauchy problem

Abstract A new approach is developed for investigating abstract Cauchy problems for first order systems of operator differential equations. Questions of existence, representation, and uniqueness for solutions of these systems are settled. Several applications are given and generalizations and extensions of the method are discussed.

Priapism: An unusual complication of heparin therapy for sudden deafness

Two cases of priapism occurring during heparin therapy for sudden hearing loss are reported. The association of anticoagulants and priapism is increasingly recognized. Literature studying possible mechanisms of the role of heparin in priapism is reviewed.

The blood supply of the otic capsule of the human ear, with special reference to that of the cochlea.

This is taken to be the case because of the following circumstances: 1) variation in the source-vessels is considerable, since they arise in areas as far separated as subclavian and intracranial; 2) their developmental course is exceptional, being the supply to a skeletal element of the cranium which, despite its small size, is a composite of fourteen ossification centers; 3) the adult relation of the vessels to the three-layered osseous cochlea is determined by steps in morpho-

On the invariance principle of scattering theory

Abstract The invariance principle of scattering theory is proved under certain rate-of-convergence conditions. As a consequence we obtain an invariance principle in the case of potential scattering with potentials V(x) satisfying (1+|x|)δV(x)∈l2(R3) for some δ > 0.

Surgical management of otitis media (recurrent and nonsuppurative)

In 1977 Paradise outlined the role of tympanostomy tubes in nonsuppurative otitis media. Over the intervening 10 years the role has changed little. Exceptions would be the demonstrated advantage of tube placement over myringotomy alone in those patients with effusion for longer than 2 or 3 months, or over prophylactic sulfonamide or placebo in recurrent otitis media.

The linear shallow water theory: a mathematical justification

The authors provide in the space of square integrable measurable functions a mathematical justification for the “shallow water” theory for time-dependent two-dimensional flows of an inviscid, irrotational, incompressible fluid moving under the influence of gravity. A by-product of this investigation is a new derivation of the “shallow water” equations.

Expansions for K ν (ξ) involving Airy's function

In this note it is shown that the modified Bessel function of arbitrary order may be represented as the sum of two products where one product involves Airys function and the other product involves the first-order derivative of Airys function.