By Mark A Oyama, Marc S Kraus, Anna R Gelzer
During this concise and functional evaluate, the authors realize that one of the diversity of cardiac investigations on hand to veterinarians, the normal electrocardiogram (ECG) is an fundamental, secure and cheap attempt in assessing canine and cats with middle sickness. Following dialogue of the foundations of electrocardiography, the ebook systematically explores the overview of the ECG-including decision of center expense, size of periods, derivation of the suggest electric axis, and standards for atrial and ventricular expansion or hypertrophy. It additionally examines intraventricular conduc. Read more...
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Additional resources for Rapid Review of ECG Interpretation in Small Animal Practice
2 What is the clinical significance of this ECG? aVR I 7 II aVL aVF III II Question 8 ECG from a 9-year-old Collie being treated for glomerulonephritis and progressive respiratory distress and tachycardia. 1 What are the findings in ECG 8 (50 mm/s; 10 mm/mV)? 2 What is the clinical significance of this ECG? indd 41 10/9/13 9:50 PM Answers 7, 8 ECG Cases Answer 7 1 ECG 7 shows sinus rhythm with evidence of left ventricular hypertrophy. 2 • The average heart rate is 210 bpm. The rhythm is regular.
1 What are the findings in ECG 2 (25 mm/s; 20 mm/mV)? 2 What is the clinical significance of this ECG? indd 35 10/9/13 9:50 PM Answers 1, 2 ECG Cases Answer 1 1 ECG 1 shows sinus rhythm with low amplitude QRS complexes and electrical alternans. 2 • The heart rate is ~145 bpm. The P wave amplitude is normal. 0 mV which is unusual for a large breed dog. The R wave height varies slightly with every other beat, most easily appreciated in leads II and aVF. Beat to beat variation in QRS complex amplitude or configuration is called electrical alternans.
Immediately following cardioversion, there are two ventricular beats (red arrows), followed by restoration of sinus rhythm with normal P waves (purple arrows) and QRS complexes (green arrow). 5 II x 1 1–30 Hz Shock 1 100 J Impedance 55 25 mm/s Answer 6 1 ECG 6 shows sinus rhythm. 2 • The heart rate is ~94 bpm. The rhythm is regular and there is a P for every QRS and QRS for every P. The amplitude and duration of the P and QRS complexes are normal. 6 mV. In order for the QRS complexes from each lead to fit onto the paper without overlapping each other, note that the ECG sensitivity was set at 5 mm/mV, which is half the normal (10 mm/mV) setting.