• 1. Chess GF, Tam RM, Calaresu FR. Influence of cardiac neural inputs on rhythmic variations of heart period in the cat. Am J Physiol 1975; 228: 775780.

    • Search Google Scholar
    • Export Citation
  • 2. Yasuma F, Hayano J. Respiratory sinus arrhythmia: Why does heartbeat synchronize with respiratory rhythm? Chest 2004; 125: 683690.

    • Search Google Scholar
    • Export Citation
  • 3. Miller MS, Tilley LP, Smith FWKJ, et al. Electrocardiography. In: Fox PR, Sisson D, Moise NS, eds. Textbook of canine and feline cardiology. 2nd ed. Philadelphia: WB Saunders Co, 1999; 67106.

    • Search Google Scholar
    • Export Citation
  • 4. Muir WW. Cardiovascular system. In: Tranquilli WJ, Thurmon JC, Grimm KA, eds. Lumb and Jones' veterinary anesthesia and analagesia. 4th ed. Ames, Iowa: Blackwell Publishing, 2007; 61116.

    • Search Google Scholar
    • Export Citation
  • 5. Saelinger CA, Estrada AH, Maisenbacher HW III. ECG of the month. Exaggerated sinus arrhythmia and wandering pacemaker. J Am Vet Med Assoc 2008; 233: 231233.

    • Search Google Scholar
    • Export Citation
  • 6. Daniels S, Iskandrian AS, Hakki AH, et al. Correlation between changes in R wave amplitude and left ventricular volume induced by rapid atrial pacing. Am Heart J 1984; 107: 711717.

    • Search Google Scholar
    • Export Citation
  • 7. Brody DA. A theoretical analysis of intracavitary blood mass influence on the heart-lead relationship. Circ Res 1956; 4: 731738.

  • 8. Amoore JN. The Brody effect and change of volume of the heart. J Electrocardiol 1985; 18: 7175.

  • 9. Manoach M, Gitter S, Grossman E, et al. Influence of hemorrhage on the QRS complex of the electrocardiogram. Am Heart J 1971; 82: 5561.

    • Search Google Scholar
    • Export Citation
  • 10. Della Torre PK, Zaki S, Govendir M, et al. Effect of acute hemorrhage on QRS amplitude of the lead II canine electrocardiogram. Aust Vet J 1999; 77: 298300.

    • Search Google Scholar
    • Export Citation
  • 11. Voukydis PC. Effect of intracardiac blood on the electrocardiogram. N Engl J Med 1974; 291: 612616.

  • 12. Stoelting RK, Hillier SC. Benzodiazepines. Pharmacology & physiology in anesthetic practice. 4th ed. Philadelphia: Lippincott Williams & Wilkins, 2006; 140154.

    • Search Google Scholar
    • Export Citation
  • 13. Lin H. Dissociative anesthetics. In: Tranquilli WJ, Thurmon JC, Grimm KA, eds. Lumb & Jones' veterinary anesthesia and analagesia. 4th ed. Ames, Iowa: Blackwell Publishing, 2007; 301354.

    • Search Google Scholar
    • Export Citation
  • 14. Stoelting RK, Hillier SC. Opioids. In: Pharmacology & physiology in anesthetic practice. 4th ed. Philadelphia: Lippincott Williams & Wilkins, 2006; 87126.

    • Search Google Scholar
    • Export Citation
  • 15. Feldberg W, Wei E. Analysis of cardiovascular effects of morphine in the cat. Neuroscience 1986; 17: 495506.

  • 16. Laubie M, Schmitt H, Vincent M. Vagal bradycardia produced by microinjections of morphine-like drugs into the nucleus ambiguous in anesthetized dogs. Eur J Pharmacol 1979; 59: 287291.

    • Search Google Scholar
    • Export Citation
  • 17. Lemke KA. Anticholinergics and sedatives. In: Tranquilli WJ, Thurmon JC, Grimm KA, eds. Lumb and Jones' veterinary anesthesia and analgesia. 4th ed. Ames, Iowa: Blackwell Publishing, 2007; 203240.

    • Search Google Scholar
    • Export Citation

Advertisement

ECG of the Month

Kerrie A. Lewis DVM1, Brian A. Scansen DVM, MS2, and Turi K. Aarnes DVM, MS3
View More View Less
  • 1 Department of Veterinary Clinical Sciences, College of Veterinary Medicine, The Ohio State University, Columbus, OH 43210.
  • | 2 Department of Veterinary Clinical Sciences, College of Veterinary Medicine, The Ohio State University, Columbus, OH 43210.
  • | 3 Department of Veterinary Clinical Sciences, College of Veterinary Medicine, The Ohio State University, Columbus, OH 43210.

A 2-year-old 5.3-kg (11.7-lb) castrated male domestic shorthair cat was referred to the Orthopedic Service at The Ohio State University Veterinary Medical Center for tendon surgery following diagnosis of deep digital flexor contracture of the right forelimb. The cat was not receiving any medications at the time of the initial evaluation.

During evaluation on the day of surgery, the cat was bright, alert, and responsive. Rectal temperature was 38.2°C (100.7°F). Heart rate was 164 beats/min. Auscultation revealed no audible murmurs or arrhythmias; respiratory rate was 44 breaths/min, and lung sounds were considered normal. The cat's right carpus and digits were

Contributor Notes

The authors thank Dr. Robert Hamlin for assistance with ECG interpretation.

Address correspondence to Dr. Lewis (Lewis.1074@osu.edu).