circulatory Flashcards
(34 cards)
Normal Heart Rates
Dog 70 – 140 bpm
Cat 100 – 200 bpm
Volume overload causes of Heart failure
A/V insufficiency
Patent ductus arteriosus
Ventricular septal defect
Compensatory Mechanisms of heart failure
- Increase heart rate (sympathetic stimulation)
- Retained body fluid to increase venous return (RAAS)
- Cardiac dilation and hypertrophy
Catecholamines
Are hormones( dopamine, norepinephrine (noradrenaline), and epinephrine (adrenaline).
Endocardiosis
Infection of the endocardium (includes the lining of
the heart valves)
Endocardiosis
Acquired condition causing degeneration of
the valves of the heart
(nodular thickening and fibrosis of the
valve leaflets)
hypertrophy
Pumping harder
Endocardiosis Common in which dogs
- CKCS (over represented)
- Poodles, Pekingese, Schnauzers
Endocardiosis effects which valves
Often mitral (bicuspid) valve
Mitral valve endocardiosis clinical signs
- Left heart murmur
- Poor venous return from the
lungs - Pulmonary congestion
- Pulmonary oedema
- Dyspnoea, tachypnoea and
often coughing
Tricuspid valve endocardiosis clinical signs
- Right heart murmur
- Poor venous return from the
body - Congestion of liver, spleen
- Ascites
LAB RAT
Left Atrium = Bicuspid
Right Atrium =Tricuspid
Diuretics are used for
pulmonary oedema and congestion (Frusomide)
ACE inhibitors are used for
vasodilator and decreases the salt and
water retention (e.g. benazepril)
Positive inotrope are used for
improves contractility (e.g.
pimobendan)
Cardiomyopathy
Diseases affecting the myocardium
Primary or secondary Cardiomyopathy
Dilated cardiomyopathy in cats secondary to taurine deficiency
* Hypertrophic cardiomyopathy in cats secondary to hyperthyroidism
Dilated Cardiomyopathy
Results in ineffective pumping action due to dilation and thinning of myocardium
Dilated Cardiomyopathy common in which breeds of Dogs
- Doberman, Irish
Wolfhounds, Great Danes
Hypertrophic Cardiomyopathy
Thickening of the heart muscle. Prevents normal filling
Hypertrophic Cardiomyopathy common in cats
Maine Coon
*Secondary to hyperthyroidism
Hypertrophic Cardiomyopathy clinical signs
- Tachycardia
- Dyspnoea and tachypnoea
- Heart murmur and gallop rhythm
- Signs of left sided heart failure
Feline Acute Thromboembolism (FATE) AKA
saddle thrombus