Clinically silent atrial dissociation in a dog

Kovačević, Alan; Sastravaha, Amornrate

doi:10.1016/j.jvc.2007.08.003

Cited by 7 publications

(10 citation statements)

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“…Die Atriale Dissoziation (AD) ist eine selten diagnostizierte Arrhythmie, die bisher bei Tieren kaum beschrieben wurde. [1][2][3] Eine atriale Dissoziation ist das Vorhandensein eines ektopischen atrialen Rhythmus (P'), der unabhängig vom normalen Sinusrhythmus agiert. Das P'-P' Intervall ist in der Regel nicht regelmässig und die Morphologie der P'-Welle ist wechselhaft.…”

Section: Diskussionunclassified

“…32 In einem Fallbericht über AD wurde ein hoher vagaler Tonus nachgewiesen. 3 Da unser Patient an einer Pathologie des Innenohrs litt, kann vermutet werden, dass der Vagotonus erhöht war. Ein Einfluss des Vagotonus als möglichen Auslöser der atrialen Dissoziation kann nicht ausgeschlossen werden, da kein EKG vor dem Auftreten der Ohrprobleme vorliegt.…”

Section: Diskussionunclassified

“…Eine Therapie der atrialen Dissoziation wird beim Hund nicht empfohlen, da es sich bei den drei beschriebenen Fällen in der Literatur um benigne Rhythmen gehandelt hat. [1][2][3] Dieser Fallbericht weist einige Limitation auf, die mit dem klinischen Kontext in Zusammenhang stehen. Die Reproduzierbarkeit der Konversion wurde nicht nachgewiesen, da nach der Anästhesie für die MRT-Untersuchung Propofol nicht mehr angewendet wurde.…”

Section: Diskussionunclassified

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Atrial dissociation in a boxer with a carcinoma of the middle ear

Brunner¹,

Kovačević²

2020

SAT

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Atrial dissociation in a boxer with a carcinoma of the middle earThe case report describes an atrial dissociation in a 9-year-old male boxer diagnosed by ECG and echocardiography. Torticollis, severe neck pain and auscultatory arrhythmia were found during the clinical examination. In addition, a mass was found in the left tympanic bulla and histologically a carcinoma of the middle ear was diagnosed.

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Section: Diskussionunclassified

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Atrial dissociation in a boxer with a carcinoma of the middle ear

Brunner¹,

Kovačević²

2020

SAT

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“…Congenital cardiac defect is most common in Labrador Retrievers [13]. A previous study reported that a routine yearly ECG recording in a Labrador Retriever detected a normal sinus rhythm with first degree atrioventricular (AV) blockade and atrial dissociation [14]. In addition, large-sized dogs have enough atrial mass to induce atrial arrhythmias (AF) [15].…”

Section: Introductionmentioning

confidence: 99%

The effects of breed, age, sex, and body weight on electrocardiographic parameters in military working dogs

et al. 2020

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Aim: This study aimed to investigate the effects of breed, sex, age, and body weight on different electrocardiographic parameters in military working dogs (Labrador Retriever and German Shepherd). Materials and Methods: Electrocardiographic recordings (paper speed = 25 mm/s and calibration = 10 mm/mV) were performed to obtain all the standard bipolar limb leads (leads I, II, and III) and unipolar augmented limb leads (leads aVR, aVL, and aVF). A total of 16 Labrador Retrievers and 14 German Shepherds were restrained manually in the right lateral recumbency without any tranquilizer or anesthetic drug. Amplitude and duration of P, QRS, and T wave, PR and QT interval, mean electrical axis, and heart rate were measured in each recording. Results: There was no significant difference in electrocardiographic parameters across breed and sex. However, QRS duration tended to alter by breed (p<0.1) in Labrador Retrievers (0.04±0.005 s), which is lower than German Shepherds (0.05±0.005 s). PR interval was influenced by sex (p<0.1). PR interval was higher in females (0.13±0.005 s) than males (0.11±0.008 s). In addition, electrocardiographic values were not significantly affected by age and body weight, except that the amplitude of R wave was statistically affected by age (p<0.05). A correlation was found between the decrease in R wave amplitude and increase in age of dogs. Conclusion: Different electrocardiographic parameters were within the normal range. A significant effect of age was seen on amplitude of R wave. However, the effect of breed, sex, and body weight was not significant on different electrocardiographic parameters in Labrador Retriever and German Shepherd dogs.

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“…1 Given these findings, atrial dissociation (AD) was diagnosed. [1][2][3][4][5] The dissociated rhythm was suspected to be atrial tachycardia arising from an atrial roof ectopic focus. 1 In light of the ECG abnormality, transthoracic echocardiography was performed to further explore the dog's cardiac status.…”

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confidence: 99%

ECG of the Month

Romito

Lambertini

Mazzanti

et al. 2022

javma

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A 9-year-old 31-kg castrated male mixed-breed dog was referred to the Veterinary Teaching Hospital of the University of Bologna for treatment of a 4 X 4-cm splenic mass incidentally identified by the referral veterinarian. The dog was otherwise healthy; its past medical history was unremarkable. On presentation, cardiac auscultation revealed an irregular heart rhythm with a heart rate of 80 to 120 beats/ min. The femoral pulses were strong and synchronous with the heartbeat. The remaining physical findings were normal. Preanesthetic screening included routine blood tests (CBC, serum biochemical panel, and restricted coagulation panel) and thoracic radiography, which yielded unremarkable results. A 6-lead ECG was obtained (Figure 1). ECG InterpretationAn irregular rhythm with a mean heart rate of 120 beats/min was present. Narrow QRS complexes (duration, 0.07 seconds) with normal morphology and mean electric axis (89°) were evident. Two distinct P-wave configurations coexisted. The first configuration was characterized by P waves of normal amplitude (0.15 mV), duration (0.04 seconds), and axis (72°). They were constantly associated with a QRS complex and normal PQ interval (0.11 seconds). On the basis of these features, they were considered sinus in origin. The second configuration included smaller P' waves (amplitude, 0.05 mV; duration, 0.025 seconds) with a fast and irregular coupling interval (0.18 to 0.22 seconds). They occurred independently from the QRS complexes and were occasionally superimposed on the QRS complexes, T waves, and sinus P waves. The P' waves were almost isoelectric in lead I, positive in the inferior leads, and negative in the remaining leads, suggesting an atrial vector with a superior-to-inferior direction. 1 Given these findings, atrial dissociation (AD) was diagnosed. [1][2][3][4][5] The dissociated rhythm was suspected to be atrial tachycardia arising from an atrial roof ectopic focus. 1 In light of the ECG abnormality, transthoracic echocardiography was performed to further explore the dog's cardiac status. Cardiac dimensions and functional parameters were normal, and no valvular insufficiency was found. Intriguingly, 2-D and M-mode analysis through the mitral valve revealed simultaneous leaflet opening with the P' waves. Additionally, pulsed-wave Doppler ultrasonographic interrogation of the mitral inflow documented abnormal diastolic waves induced by P' waves (Figure 2). These findings were judged to be caused by abnormal active atrial contractions mediated by dissociated P' waves. 2,5,6 On the basis of previous veterinary reports describing AD in dogs as a benign entity, 2-5 the dog underwent splenectomy on the same day.For the anesthetic procedure, a multiparameter monitor (Datex Ohmeda S5; GE Healthcare) was used to monitor the dog's cardiac rhythm. The dog was sedated with acepromazine (10 µg/kg, IM), dexmedetomidine (1 µg/kg, IM), and methadone (0.2 mg/ kg, IM). Ten minutes after premedication, AD with a slow ventricular response rate (minimum heart rate, 45 beats/min) was stil...

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Clinically silent atrial dissociation in a dog

Cited by 7 publications

References 7 publications

Atrial dissociation in a boxer with a carcinoma of the middle ear

Atrial dissociation in a boxer with a carcinoma of the middle ear

The effects of breed, age, sex, and body weight on electrocardiographic parameters in military working dogs

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