Vectorcardiographic finding of varying degrees of left anterior hemiblock. A case report

A 16-year-old high school boy showed various types of aberrant QRS complexes during supraventricular premature beats. The aberrant beats showed right bundle branch block pattern associated with varying degrees of left axis deviation. Rosenbaum et al explained it by slowing in conduction through the anterior fascicle in a bifascicular nature of human left bundle system. The alternative explanation might be possible if we consider a fan-like left bundle as proposed by Massing et al: namely incomplete or slight left axis deviation results from block of a small group of anterior parts of the fan-like left bundle, whereas marked left axis deviation results from block of a large number of fibers. The initial QRS force also changed to various degrees according to changes of the QRS axis. This case suggested the existence of an incomplete type of left anterior hemiblock, which produced not only an incomplete QRS axis change but also an incomplete change of the initial QRS forces.

Prevalence of feline viral antibodies in random-source laboratory cats

Over a period of 1973 to 1979, a serologic survey of virus infections was conducted on feline sera collected in four universities which located in different prefectures; Obihiro, Saitama, Kanagawa and Tokyo. A significant hemagglutination-inhibition (HI) antibody titer of 1 : 8 or higher to feline panleukopenia virus (FPLV) was detected in 130 (58%) of the 226 sera used. No remarkable difference in the HI antibody prevalence in cats to FPLV was recognized by years or localities. Of a total of 188 cats tested, 99 (53%) presented positive serum neutralizing (SN) antibody titers to the No. 1 strain of feline calicivirus (FCV). Especially in Kanagawa, 17 (77%) of the 22 cats had positive SN titers. However, only 42 (22%) of the 188 sera showed positive SN titers to the Kyoritsu strain of FCV. Such lower positivity in the cats was observed with 13% in the SN test to human reovirus type 3 (Reo-3). The incidence of positive SN antibodies to feline rhinotracheitis virus (FRV) also remained in low values of 20 to 27% with the exception of high percentage of 86 in Tokyo. The dissemination of FPLV, FRV, FCV and Reo-3 was briefly discussed in relation with the age distribution of viral antibodies in cats.