Advances in Animal Cardiology
Online ISSN : 1883-5260
Print ISSN : 0910-6537
ISSN-L : 0910-6537
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Volume 35, Issue 2
Displaying 1-6 of 6 articles from this issue
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REVIEW
ORIGINALS
  • Reference Values of Six-limb-lead ECG in Conscious Taiwanese Dogs
    Whey-Li SU, Kimehiko TOO, Ming-Hseng WANG, Yan-Nian JIANG, Ming-Jeng P ...
    2002 Volume 35 Issue 2 Pages 86-95
    Published: 2002
    Released on J-STAGE: July 07, 2005
    DOIhttps://doi.org/10.11276/jsvc.35.86
    JOURNAL FREE ACCESS
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    The electrocardiogram (ECG) was collected from thirty healthy dogs raised in Taiwan by an ECG analyzer designed specifically for dogs and cats. It consists of three bipolar limb leads (I, II and III) and three augmented unipolar limb leads (aVR, aVL and aVF). All tested subjects were mixed-breed companion dogs in both sexes, 4.7 to 19.0 kg in body weight (BW), and with the age ranging from 1.3 to 8.0 years old. During recording, dogs were kept in right lateral recumbency without giving any chemical restraint. Prior to presenting these values, each set of data was validated by both normality test and descriptive statistics. Pearson correlation was also made based on the gender, BW, age and heart rate. In conclusion, the presented reference values were useful especially when the tested dogs were fitted in above categories.
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  • The Rheological Properties of the Aorta in Rabbits at Different Ages
    Shin-ichiro KATSUDA, Masamitu HASEGAWA, Masahiko KUSANAGI, Noboru MACH ...
    2002 Volume 35 Issue 2 Pages 96-104
    Published: 2002
    Released on J-STAGE: July 07, 2005
    DOIhttps://doi.org/10.11276/jsvc.35.96
    JOURNAL FREE ACCESS
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    The aim of the present study is to investigate effect of aging on the rheological properties of the aortic wall in normal rabbits aged 10-12, 22-24 and 34-36 months old in relation to characteristics of the microstructure. The rheological properties were assessed with tension-strain, stress-strain and incremental elastic modulus at 50% stretching from the initial length. Circumferential wall strip 3.0 mm in width was prepared from the ascending, proximal thoracic and proximal abdominal aortas. Both ends of the strip were sandwiched between two especially-designed chucks attached to a tensile testing instruments, immersed in saline solution at 37°C and stretched at speed of 4.17 mm/min to generating tension at about 20 g. There were no significant changes in wall tension, wall stress, incremental elastic modulus and wall thickness among the three age groups. No remarkable alteration in the microstructure with aging was observed in these age groups. The rheological characteristics reflected histological findings in any of aortic region tested in these age groups. We can conclude that the rheological properties of the aorta in normal rabbits were not affected by aging within the age range from 10-12 to 34-36 months old.
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  • Evaluation of Corrected QT Interval in Dogs Using Fridericia's Cube Root Formula
    Hidekazu KOYAMA, Hisashi YOSHII, Akiko YOSHII, Hideyuki YABU, Hironori ...
    2002 Volume 35 Issue 2 Pages 105-112
    Published: 2002
    Released on J-STAGE: July 07, 2005
    DOIhttps://doi.org/10.11276/jsvc.35.105
    JOURNAL FREE ACCESS
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    The QT interval indicates the duration of the action potential of the ventricular muscles and it is one of the important criteria used in the evaluation of electrocardiograms. Among the many physiologic and pathologic factors that contribute to the QT interval, the heart rate plays a major role. Several formulas have been proposed to adjust the QT interval for the heart rate; and the most commonly utilized formula is the QT correction formula proposed by Bazett. However, several studies have shown that Bazett's correction formula is not optimal. This study evaluates Fridericia's cube root formula (QTc2) relative to Bazett's formula (QTc1) to characterize the RR-QT relationship in dogs. ECG was recorded from 407 privately owned dogs. The dogs fulfilled the following criteria: no history and physical examination of heart disease and normal sinus rhythm or sinus arrhythmia. The correlation between the QT interval and RR interval was the highest (r=0.676, p<0.0001) compared to QTc1 and RR (r=−0.568 (p<0.0001)) and QTc2 (r=−0.180 (p<0.0005)). The QTc2 had the lowest correlation, and our results suggest that Fridericia's cube root formula is more adequate than Bazett's square root formula to correct the heart rate-dependent QT change in dogs.
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CASE REPORTS
  • A Canine Case of Aortic Body Tumor Occurring at the Heart Base with Systemic Metastasis
    Miki SHIMIZU, Ryou TANAKA, Kohji MARUO, Yoshihisa YAMANE, Nobuyuki KIR ...
    2002 Volume 35 Issue 2 Pages 113-118
    Published: 2002
    Released on J-STAGE: July 07, 2005
    DOIhttps://doi.org/10.11276/jsvc.35.113
    JOURNAL FREE ACCESS
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    A 10-year-old male golden retriever was presented with weight loss, anorexia, lethargy and non-productive cough. Thoracic radiography and echocardiography revealed the presence of a 5-cm mass located at the heart base. Abdominal ultrasonography showed multiple mass lesions in the liver and kidneys, suggesting systemic metastasis of the heart base tumor. The dog was treated conservatively, with no improvement in clinical signs, and died 33 days after admission. At necropsy, gray-white and encapsulated mass was found attached to the aortic root, invading part of the left atrial wall. Microscopically, the mass was diagnosed as aortic body tumor occurring at the heart base. The tumor metastasized into the heart, lungs, cranial and tracheobronchial lymph nodes, liver, spleen, pancreas, kidneys, adrenal glands, urinary bladder, and mesenteric lymph nodes. Systemic metastasis of aortic body tumor occurring at the heart base as seen in the present case is rare.
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METHODS
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