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Volume 24 (1991)
- Issue 24 Pages 1-
Predecessor
Volume 24, Issue 24
Displaying 1-5 of 5 articles from this issue
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Takashi NAKAMURA, Noboru MACHIDA, Nobuyuki IZUMISAWA, Hiroshi MURAKAMI ...1991 Volume 24 Issue 24 Pages 1-5
Published: 1991
Released on J-STAGE: September 17, 2009
JOURNAL FREE ACCESSThis study was designed to induce atrial fibrillations experimentally in 10 dogs exhibiting normal sinus rhythms. In this study epinephrine hydrochloride was injected subcutaneously into each dog under chloral hydrate anesthesia. The drug was administered in total of 152 experiments in these 10 animals. As a result, atrial fibrillations were induced in total of 9 experiments in 7 animals. Some arrhythmias, such as ventricular premature contractions, ventricular tachycardia and ventricular escape rhythm, accompanied with these atrial fibrillations in all these 9 experiments. Although there was no evidence that the atrial fibrillation was initiated by such ventricular arrhythmias, the present electrocardiographic findings of drug-induced atrial fibrillation in dogs suggest that there is a possible relationship between atrial fibrillation and ventricular arrhythmias.View full abstractDownload PDF (295K) -
Yasuo MOROHOSHI, Jun-ichi KOTANI, Shigenobu NAKAYAMA, Takeshi MUTOU1991 Volume 24 Issue 24 Pages 6-10
Published: 1991
Released on J-STAGE: September 17, 2009
JOURNAL FREE ACCESSThe air embolism and the sodium pentbarbital injection via vena are the basic methods of euthanasia in the rabbit. The air embolism method was compared with the sodium pentbarbital injection method.
The air embolism method should not be used, because it tends to cause a time lag between the cardiac standstill and the signs of brain death (disappearance of light reflex, breathing, electric potential of EEG).
This study demonstrated the incompleteness of intravenous injection of air under anesthesia.View full abstractDownload PDF (367K) -
Tomhiro NAKAYAMA, Yoshito WAKAO, Toshifumi WATANABE, Atsushi OKUMURA, ...1991 Volume 24 Issue 24 Pages 11-19
Published: 1991
Released on J-STAGE: September 17, 2009
JOURNAL FREE ACCESSA 30-month-old female Shetland sheepdog was referred to with a history of cardiac murmur, dyspnea and exercise intolerance. The electrocardiogram showed biatrial and biventricular enlargements. The phonocardiogram revealed holosystolic murmurs at the cardiac apex and crescendo-decrescendo ejectional murmurs at the aortic area. The thoracic radiography indicated an extreme enlargement of the left atrium and mild enlargement of the left and right ventricles. The cross sectional echocardiography showed a subaortic stenosis and a mitral valve prolapse in the long axis view of the right side, and suggested the perimembranous ventricular septal defect(VSD) in the four chamber view. Severe subaortic stenosis was demonstrated with a systolic pressure gradient which was estimated by means of cardiac catheterization to be 100 mmHg at the obstruction. Moreover, mitral regurgitation, aortic regurgitation and VSD were detected.
The dog died 7 months after the first medical examination. At autopsy, there were huge left atrium, severe subaortic stenosis and small perimembronous VSD. Furthermore, atrioventricular valve abnormalities were recognized as mitral cleft and septal insertion of the anterior mitral leaflet. We considered that these mitral valve abnormalities were associated with atrioventricular septal defect.View full abstractDownload PDF (4349K) -
Motoki KONDO, Makoto WASHIZU, Gen KINOSHITA, Kunito KOBAYASHI, Kazunor ...1991 Volume 24 Issue 24 Pages 20-26
Published: 1991
Released on J-STAGE: September 17, 2009
JOURNAL FREE ACCESSA 4-month-old female shetland sheepdog was referred to Nippon Veterinary and Animal Science University due to patent ductus arteriosus (PDA). During the operation, severe systemic hyperten sion (267/137 mmHg), bradycardia(70 beats/mim), and ventricular premature contractions (VPCs) were observed after the ligation of the ductus arteriosus. Acepromazine (0. 05 mg/kg) and furosemide (4 mg/kg) were utilized to normalize the blood pressure during the operation. After the blood pressure returned to normal range(128/113 mmHg), bradycardia and VPCs disappeared following the second ligation of the ductus arteriosus. Pharmacological modulation of severe systemic hypertension caused by the ligation of the ductus arteriosus an important means for making a good success in the operation of PDA.View full abstractDownload PDF (479K) -
Yukio AIDA, Masayuki OHARA1991 Volume 24 Issue 24 Pages 27-32
Published: 1991
Released on J-STAGE: September 17, 2009
JOURNAL FREE ACCESSDownload PDF (281K)
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