Familial Three Cases of Labrador Retriever with Negative P Wave

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1 (2010) P 3 1) 1, 2) 2) 1, 2) 1, 2) 1) ) Familial Three Cases of Labrador Retriever with Negative P Wave Ryota IINO, Yoko FUJII, Hiroshi TAKANO, Takuma AOKI and Yoshito WAKAO Faculty of Veterinary Medicine, Azabu University, Fuchinobe, Sagamihara , Japan 3 II P X P P P P (2010) P II 1) P P 2, 3) 3 QRS 7

P P 1 1 1 II, III, avf, V10 P 10 mm/mv, 50 mm/sec. 1 1 3 24.8 kg 38.

2 P P II, III, avf, V10 P 10 mm/mv, 50 mm/sec kg / 24 / CBC X 10.1, 60.1 B M II, III, avf P 1 P (0.08 sec) 2a PR (0.08 sec), QRS (0.05 sec, 1.3 mv), QT (0.18 sec), T 0.5 mv CV6LL S (1.2 mv) 0.04 mg/kg 2 1 II a: 150 bpm sec P b: P 10 mm/mv, 50 mm/sec. 8

3 20 P (0.35 mv) (0.04 sec) PR (0.08 sec) 2b CH1 P P 3 P P 4 P P RR P RR 1 RR kg 22.0 kg P P P QRS P P RR 4 1 P 10 mm/mv, 25 mm/sec. 9

4 P P P QRS 1 1 P QRS P / 4060 / 1) / 190 / 46) 5, 7) / 4, 7, 8) warm-up cool-down 7, 9) 1 P warm-up cool-down P (AVNRT) slow Kent long RP RR P PR 10, 11) 5) P 10

5 12) II P 13) P 1214) 15) 16) (Subsidiary Atrial Pacemaker; SAP) SAP 1719) SAP 2022) Boineau 23, 24) atrial pacemaker complex 25) SAP 26) P SAP P 2, 27) 28, 29) 30) P P 31, 32) P 11

6 P ) 75 SAP 34) 3 P P 1) Mark, D. K. and D. K. Richard: ) Tilley, L. P.: LL ) Borys, S. and K. K. Timothy: Atrial Abnormalities. In: Chou s Electrocardiography in Clinical Practice (6th ed.), pp. 2944, Saunders, Philadelphia, ) Tilley, L. P.: LL ) Borys, S. and K. K. Timothy: Atrioventricular Junctional Rhythms. In: Chou s Electrocardiography in Clinical Practice (6th ed.), pp , Saunders, Philadelphia, ) Kerr, C. R., Gallagher, J. J., Cox, J. L., Smith, W. M. and R. Sterba (1982): Accelerated junctional tachycardia at a rate of 190 beats/minute following cryosurgery and aneurysmectomy for ventricular tachycardia: A case report. Pacing Clin. Electrophysiol., 5, ) ) ) 4 1,

7 10) Mirowski, M. (1966): Left atrial rhythm; diagnostic criteria and di#erentiation from nodal arrhythmias. Am. J. Cardiol., 17, ) Rutenberg, H. L. and L. A. Solo# (1970): Simulation of left atrial rhythm by right atrial pacing. Am. J. Cardiol., 26, ) Waldo, A. L., Vitikainen, K. J. and B. F. Ho#man (1975): The sequence of retrograde atrialactivation in the canine heart. Correlation with positive and negative retrograde P waves. Circ. Res., 37, ) Kistler, P. M., Roberts-Thomson, K. C., Haqqani, H. M., Fynn, S. P., Singarayar, S., Vohra, J. K., Morton, J. B., Sparks, P. B. and J. M. Kalman (2006): P-wave morphology in focal atrial tachycardia: Development of an algorithm to predict the anatomic site of origin. J. Am. Coll. Cardiol., 48, ) SippensGroenewegen, A., Peeters, H. A., Jessurun, E. R., Linnenbank, A. C., de Robles, Medina E. O., Lesh, M. D. and N. M. van Hemel (1998): Body surface mapping during pacing at multiple sites in the human atrium: P-wave morphology of ectopic right atrial activation. Circulation, 97, ) Hancock, E. W. (1964): Coronary sinus rhythm in sinus venosus defect and persistent left superior vena cava. Am. J. Cardiol., 14, ) L. H.: ) Randall, W. C., Talano, J., Kaye, M. P., Euler, D., Jones, S. and G. Brynjolfsson (1978): Cardiac pacemakers in absence of the SA node: Responses to exercise and autonomic blockade. Am. J. Physiol., 234, H465H ) Jones, S. B., Euler, D. E., Randall, W. C., Brynjolfsson, G. and E. L. Hardie (1980): Atrial ectopic foci in the canine heart: hierarchy of pacemaker automaticity. Am. J. Physiol., 238, H788H ) Jones, S. B., Euler, D. E., Hardie, E., Randall, W. C. and G. Brynjolfsson (1978): Comparison of SA nodal and subsidiary atrial pacemaker function and location in the dog. Am. J. Physiol., 234, H471H ) Rubenstein, D. S. and S. L. Lipsius (1989): Mechanisms of automaticity in subsidiary pacemakers from cat right atrium. Circ. Res., 64, ) Rozanski, G. J. and S. L. Lipsius (1985): Electrophysiology of functional subsidiary pacemakers in canine right atrium. Am. J. Physiol., 249, H594H ) Wit, A. L. and P. F. Cranefield (1977): Triggered and automatic activity in the canine coronary sinus. Circ. Res., 41, ) Boineau, J. P., Schuessler, R. B., Mooney, C. R., Wylds, A. C., Miller, C. B., Hudson, R. D., Borremans, J. M. and C. W. Brockus (1978): Multicentric origin of the atrial depolarization wave: The pacemaker complex. Relation to dynamics of atrial conduction, P-wave changes and heart rate control. Circulation., 58, ) Boineau, J. P., Schuessler, R. B., Roeske, W. R., Autry, L. J., Miller, C. B. and A. C. Wylds, (1983): Quantitative relation between sites of atrial impulse origin and cycle length. Am. J. Physiol., 245, H781H ) Boineau, J. P., Schuessler, R. B., Hackel, D. B., Miller, C. B., Brockus, C. W. and A. C. Wylds (1980): Widespread distribution and rate differentiation of the atrial pacemaker complex. Am. J. Physiol., 239, H406H ) Schuessler, R. B., Boineau, J. P. and B. I. Bromberg (1996): Origin of the sinus impulse. J. Cardiovasc. Electrophysiol., 7, ) 4 1, ) Izumi, K. (1992): Atrial parasystolic trigeminy with sinus node echoes during wandering sinus node pacemaker in a patient with malignant lymphoma and hypertrophic cardiomyopathy. J. Electrocardiol., 25, ) Piccolo, E., Nava, A., Maddalena, F. and G. 13

8 P Pujatti (1970): Wandering pacemakera vectorcardiographic study. Cardiology., 55, ) Anteman, E. M., et al.: Wandering pacemaker. In: Heart Disease: A Textbook of Cardiovascular Medicine, E. Braunwald, et al. ed., pp , WB Saunders, Philadelphia, ) Euler, D. E., Jones, S. B., Gunnar, W. P., Loeb, J. M., Murdock, D. K. and W. C. Randall (1979): Cardiac arrhythmias in the conscious dog after excision of the sinoatrial node and crista terminalis. Circulation, 59, ) Loeb, J. M., Euler, D. E., Randall, W. C., Moran, J. F. and G. Brynjolfsson (1980): Cardiac arrhythmias after chronic embolization of the sinus node artery: alterations in parasympathetic pacemaker control. Circulation, 61, ) Schuessler, R. B., Boineau, J. P., Wylds, A. C., Hill, D. A., Miller, C. B. and W. R. Roeske (1986): E#ect of canine cardiac nerves on heart rate, rhythm, and pacemaker location. Am. J. Physiol., 250, H630H ) Furukawa, Y., Wallick, D. W., Martin, P. J. and M. N. Levy (1990): Chronotropic and dromotropic responses to stimulation of intracardiac sympathetic nerves to sinoatrial or atrioventricular nodal region in anesthetized dogs. Circ. Res., 66,

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