congestive heart CBL

What are the three primary goals of canine CHF treatment?

1. Correct cause if possible

2. relieve signs/improve quality of life

3. prolong life

Most common cause of CHF in dogs?

Myxomatous mitral valve disease (MMVD).

Can emergency CHF treatment begin before identifying the heart disease?

Yes; stabilize breathing and congestion first.

What four elements make up acute canine CHF stabilization?

Sedation, pimobendan, oxygen, and furosemide.

Dog collapses and is orthopneic with crackles: immediate priority?

Minimize stress, provide oxygen, and treat suspected CHF.

Which sedation agent does the CHF reading describe for acute canine CHF?

Butorphanol (as needed).

Which diuretic is first-line for acute canine cardiogenic pulmonary edema?

Furosemide, preferably IV when feasible.

Why is IV furosemide preferred during acute canine CHF?

Faster onset and adjunct vasodilatory effects.

What does pimobendan contribute to canine CHF therapy?

Improves cardiac performance through inotropic and vasodilating effects.

Why minimize restraint in a dog with severe dyspnea?

Stress and handling may worsen respiratory compromise.

What parameter is monitored frequently after acute CHF therapy?

Respiratory rate and effort.

How often does the CHF reading suggest checking breathing early in hospitalization?

Approximately every 30–60 minutes.

When can IV furosemide administration become less frequent?

When respiratory rate and effort start to improve.

Why reduce a high-dose furosemide CRI after respiratory improvement?

Reduce dehydration, azotemia, and electrolyte disturbance risks.

Main hemodynamic derangement in MMVD-associated CHF?

Elevated preload and pulmonary venous pressure.

How does MMVD cause pulmonary edema?

Mitral regurgitation raises left atrial and pulmonary venous pressures.

Three radiographic clues to left-sided CHF in dogs?

Cardiomegaly, pulmonary venous distension, and pulmonary edema.

Typical radiographic location of cardiogenic edema in dogs?

Perihilar and caudodorsal lungs.

Why can pulmonary venous distension be absent in CHF?

It is inconsistent, particularly after furosemide.

Why check both lateral and VD/DV thoracic radiographic views?

Confirm suspected cardiac enlargement rather than relying on one view.

Cough and murmur but sleeping RR 18/min: is CHF established?

No; consider concurrent respiratory disease without evidence of congestion.

What sleeping respiratory rate raises concern for active canine CHF?

A persistent rate above about 30 breaths/min warrants assessment.

Which finding favors CHF over chronic bronchitis in a coughing dog?

Resting tachypnea plus compatible edema and marked cardiomegaly.

What favors chronic airway disease over active CHF?

Cough predominates, normal resting breathing, and no pulmonary edema.

Can a dog with MMVD have cough without CHF?

Yes; concurrent airway disease is common.

Which murmur is classically associated with MMVD?

Left apical systolic murmur.

Which murmur intensity is typical in MMVD-associated CHF?

Usually grade 3/6 or louder.

What is a primary problem in the collapsing orthopneic dog?

Respiratory distress requiring emergency stabilization.

What might be secondary to underlying MMVD in Ivy?

Pulmonary edema and respiratory distress due to left-sided CHF.

Which dog from the cases has MMVD?

Ivy.

What were major triage abnormalities in Ivy?

Orthopnea, pulmonary crackles, tachycardia, and grade 4 murmur.

Ivy is comfortable after CHF treatment: does this mean MMVD is cured?

No; the heart disease usually remains and needs maintenance care.

What is a key owner monitoring tool after Ivy’s discharge?

Track resting or sleeping respiratory rate and effort.

How should owners respond to new persistent tachypnea after CHF discharge?

Seek veterinary reassessment for possible recurrent congestion.

Which laboratory parameters should be monitored with diuretics?

Kidney function and electrolytes.

Why is baseline azotemia important in a dog with CHF?

It is a negative prognostic factor and affects treatment monitoring.

When is echocardiography particularly useful in CHF?

After stabilization to define cause, chambers, function, and prognosis.

When should an ECG be emphasized during CHF workup?

When an abnormal pulse/rhythm or unexplained heart rate is present.

Can an ECG alone diagnose dilated cardiomyopathy?

No; echo is needed to assess structure and systolic function.

What is the primary purpose of NT-proBNP testing?

Support assessment of cardiac stress; interpret with other findings.

What does elevated cardiac troponin suggest?

Myocardial injury; may carry prognostic significance.

Cat with dyspnea and very quiet lung sounds: top concern?

Pleural effusion.

Best immediate procedure for significant pleural effusion with dyspnea?

Therapeutic thoracocentesis.

Does improvement after thoracocentesis prove the effusion is cardiac?

No; fluid removal helps breathing but does not establish cause.

Which cat from the cases had suspected cardiomyopathy and effusion?

Chester.

What was Chester’s presumed diagnosis?

Hypertrophic cardiomyopathy phenotype (presumptive).

What test best characterizes suspected feline cardiomyopathy?

Echocardiography.

Echo hallmark of hypertrophic cardiomyopathy phenotype?

Increased left ventricular wall thickness with nondilated cavity.

Why should a cat with effusion be handled gently?

Stress can worsen respiratory distress.

What should Chester’s owner watch for after discharge?

Increased respiratory effort or rate and recurrence of dyspnea.

Why could total T4 testing matter in suspected feline cardiomyopathy?

Hyperthyroidism may contribute to cardiac changes.

What does NT-proBNP potentially help assess in a dyspneic cat?

Whether heart disease is contributing, not definitive morphology.

Why discuss antithrombotic treatment in feline cardiomyopathy?

Some cats with atrial enlargement risk arterial thromboembolism.

Dog with irregularly irregular rhythm and pulse deficits: likely rhythm?

Atrial fibrillation.

Which case dog had DCM and atrial fibrillation?

Petunia.

What clinical problem can uncontrolled AF cause in dogs?

Poor ventricular filling/output and exercise intolerance.

Which test documents atrial fibrillation?

Electrocardiography.

Which test determines structural disease underlying AF?

Echocardiography.

What distinguishes rhythm control from rate control in AF?

Rhythm control restores sinus rhythm; rate control slows ventricular response.

Can a patient improve while remaining in atrial fibrillation?

Yes, with adequate ventricular rate control.

Why monitor Petunia after successful initial therapy?

AF rate and structural heart disease may change or progress.

What are broad causes of exercise intolerance besides heart disease?

Respiratory, musculoskeletal, hematologic, metabolic, and neurologic disorders.

History clue supporting cardiovascular exercise intolerance?

Weakness or collapse during exertion with abnormal cardiac findings.

Why distinguish primary disease from secondary clinical signs?

Treat immediate threats while identifying the underlying cause.

Horse with poor performance and irregular rhythm: first cardiac test?

Resting ECG, followed by further assessment as indicated.

Which horse case presented with poor performance?

Rum Punch.

What was Rum Punch’s final cardiac diagnosis?

Atrial fibrillation.

What effect can AF have on an athletic horse during exercise?

Excessively rapid irregular response may reduce performance.

Can equine AF occur without obvious structural heart disease?

Yes; evaluate the heart for associated disease.

What key question follows unsuccessful medical treatment of equine AF?

Is further rhythm-conversion treatment suitable and safe?

What helps determine prognosis after equine AF conversion?

Underlying structure, maintained sinus rhythm, recurrence risk, and performance.

If a resting ECG misses an intermittent arrhythmia, what next?

Holter or longer event monitoring.

What defines canine MMVD Stage B2?

Preclinical MMVD with qualifying cardiac enlargement, no CHF history.

What defines canine MMVD Stage C?

Current or previous clinical signs of CHF.

What is the usual ongoing treatment implication of Stage C CHF?

Long-term management despite resolution of pulmonary edema.

When is pimobendan used in Stage B2 MMVD?

When guideline criteria for preclinical enlargement are met.

Why is routine aggressive diuresis inappropriate for asymptomatic Stage B2?

No active fluid congestion to remove.

How does LA:Ao above 1.7 relate to MMVD prognosis?

Associated with greater risk of cardiac-related death.

What does a MINE score above 8 suggest in the prognosis reading?

Higher likelihood of cardiac-related death.

What biomarkers were linked to cardiac risk in the MMVD reading?

NT-proBNP and cardiac troponin I.

Which rhythm worsens prognosis in some dogs with MMVD?

Atrial fibrillation.

How does pulmonary hypertension affect MMVD prognosis?

Associated with poorer outcomes.

How should published MMVD median survival times be used?

For population counseling, not an individual survival deadline.

What is the best approach to cardiac prognosis across different species?

Individualize by diagnosis, disease stage, complications, and treatment response.

Which finding demands immediate treatment before complete cardiac workup?

Severe respiratory distress or hemodynamic instability.

What is the difference between clinical stabilization and cure?

Symptoms may improve while the underlying heart disease persists.

Why is follow-up important after successful CHF hospitalization?

Adjust maintenance therapy and detect recurrent congestion or adverse effects.

What do exercise intolerance and syncope have in common diagnostically?

Both require cardiovascular and noncardiovascular differentials.

Which two investigations commonly complement each other in cardiac cases?

ECG for rhythm and echocardiography for structure/function.

What is the main owner education message for chronic cardiac disease?

Recognize deterioration early and adhere to monitoring and follow-up.