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Biomedical subjects

J Hanák

Publications and source records attributed to J Hanák.

At least 19 recordsLinked to original sources
PubMed1985

[Trichorrhexis nodosa in electron microscopy].

Trichorrhexis nodosa, i. e. a hair fracturing into brush-like widened stumps, was analyzed in an imbecile 4 year-old boy without any sign of aminoaciduria or disturbance of copper metabolism. Scanning electron microscopy showed smoothed hair cuticula with irregular ridges and surface splitting. According to the transmission electron microscopy disintegration of superficial and profound cuticular elements as well was due to progressive development of vacuoles and clefts in amorphous keratin.

Child, Preschool↗
PubMed1982

[ECG similarities in the parents and offspring of thoroughbred horses].

The ECG characters were studied in two sires (Manrico and Infernal) and their 26-membered set of progeny as well as in one mare (Victoire) and her five daughters. The confer of some ECG characters from the sire's side as well as from the mare's side to the offspring was demonstrated. The consistency of some ECG characters was particularly obvious in externally dominant Manrico sire and his offspring as well as in the breeding mare and her five daughters (inclination of the electric cardiac axis, intrinsicoid deflexion lag, P wave shape, deep S in the 3rd connection).

Animals↗
PubMed1980

[The effect of age and training on the ECG time curve of purebred horses].

In 246 horses of the English Thoroughbred breed of several age categories, divided into four test populations, the influence was studied of age and training on the pulse rate and time intervals of ECG (PQ, QRS, QT and QTc). It was found that with the increasing age and training action slowed down gradually. Duration of the atrioventricular path (PQ) is prolonged, time of ventricular activation (QRS) and time of the electrical systole (QT) including its value corrected according to the actual pulse rate (QTC). In this way the origin of the so called sports electrocardiogram in trained race horses is characterized.

Aging↗
PubMed1976

[Distribution of surface electric potentials in the horse heart].

Surface electric potentials of the heart of four horses were measured by use of unipolar leak with the so called central Wilson's clip; the measurements were performed on 95 precisely fixed places of the equine body. Potentials found out in this way were re-measured with bipolar leaks: the negative electrode was fixed in the place of the highest negative potentials, the positive electrode was gradually attached to places with the highest values of positive potentials. The largest potential differences when the negative electrode was placed in the region of the heart were obtained from the region of the withers, spinal and scapular regions, from forehead and nose. On the basis of these potential differences the most suitable places for uni-leak bipolar electrocardiography and radiotelemetric registration of EKG were selected. Bipolar leak -- apex of the heart -- withers -- appears most suitable; it provides the best potential and time reproducibility of EKG. The results have been processed statistically and arranged graphically.

Action Potentials↗
PubMed1976

[Single-lead bipolar electrocardiography in the diagnosis of heart diseases].

Sixty seven thoroughbred race horse of various age categories were examined electrocardiographically by bipolar leak-apex of the heart -- withers; length of training corresponded to the age categories. Basic time and voltage criteria of EKG were statistically evaluated according to electrocardiographic curves: TF = 35.1 = %/- 6.82 pulses per min., time P = 0.16 +/- 0.03 sec., PQ = 0.03 +/- 0.04 sec., QRS = 0.12 +/- +/- 0.01 sec., TQc = 0.50 sec., R = 2.83 +/- 0.63 mV, Q = 0.38 +/- 0.31 mV. Repolarization phase of the chamber complex, mainly the T wave, is the most variable component of the whole EKG. In the set under study AV block I was found in 14.93%, AV block II in 2.98%, sinoauricular block II in 1.49% and auricular fibrillation in 1.49%. In the paper the basic EKG values and occurrence of arrhythmia in relation to the rate of the training of horses are discussed.

Animals↗