Cardiovascular Diseases Flashcards
Heart failure is when blood returning to the heart cannot
be pumped out to match the body’s needs
Congestive heart failure occurs when
the failing heart allows fluid and edema to buildup in the body
Etiology of heart failure
cardiomyopathy, myocarditis, taurine deficiency in cats, circulatory failure
Pathology of canine heartworm disease
right sided heart failure
Clinical signs of heart worm disease
coughing, dyspnea, hemoptysis, ascites
Tx for heart worms
Immiticide therapy (melarsomine), Slow-kill w/ ivermectin and doxycycline
Dx of heart worm disease
antigen test and radiographs to stage the disease
Cats are an _ host to dirofilaria immitis
imperfect
Typical heart worm infection in cats only have _ adult worms causing significant clinical disease
1-2
Cats are rarely
microfilaremic
High incidence of aberrant larval migrations in
cats vs dogs
Acquired valvular disorders
chronic mitral valve insufficiency, tricuspid valve insufficiency
Most commonly encountered CVS disorder in the dog
Chronic mitral valve insufficiency aka Myxomatous mitral valve disease (or degeneration)
Etiology of Chronic mitral valve insufficiency
age, periodontal disease may exacerbate condition
Pathology of Chronic mitral valve insufficiency
degeneration of the valves and subsequent regurgitation of blood into the left atrium… can eventually progress to heart failure
Clinical signs of Chronic mitral valve insufficiency
coughing that may be worse after periods of rest/recumbency, dyspnea, systolic heart murmur heard at left apex
Dx of Chronic mitral valve insufficiency
rads reveal enlarged atrium +/- pulmonary edema; echocardiography reveals thickened, leaking valve; labs may reveal elevated kidney/liver enzymes, abnormal cardiac anzymes
A MMVD is heard best at
the apex of the heart (just caudal to the olecranon)
Cardiac arrhythmia is NOT a
murmur
A cardiac arrhythmia is
a deviation from the normal rhythm of the heart. This is due to abnormal impulse information or abnormal impulse conduction
Etiology of cardiac arrhythmias
ischemia, hypocalcemia, cardiomyopathy, hypercalcemia, etc.
Clinical signs of cardiac arrhythmias
irregular heart rate, weakness, collapse, dyspnea, death
The best way to identify and dx abnormal rhythms of the heart
ECG
The first part of the complex of ECG is called _ wave. Which represents the initiation of depolarization in the sinus node and subsequent atrial contraction
P wave
2nd part of tracing is called _ _ which represents the conductance and sequential depolarization of the ventricles
QRS complex
The _ _ follows the QRS complex which represents the period of time in which the ventricles are isoelectric
ST segment
The _ _ represents the repolarization of the ventricles
T wave
During depolarization _ rushes into the cell and _ rushes out
Na+; K+
Atrial fibrillation (“A-fib”) occurs when
there is no organized atrial contraction
Signalment if A-Fib
LARGE dogs most commonly, cats w/ underlying cardiac disease
Clinical signs of A-Fib
weakness, syncope, dyspnea in cats, rapid irregular heart rate,
Dx of A-Fib
auscultation, ECG lacks P wave
Tx for A-fib is aimed at
slowing heart rate