Diagnostics Flashcards
The P-R interval on an ECG tracing represents which event(s) of the cardiac cycle?
Atrial depolarization and conduction through the AV node (P wave is included in the P-R interval)
The canine parvovirus ELISA test will detect which feline virus?
Feline panleukopenia virus
In small animals with disease of the tricuspid valve or right ventricle, manual compression of the cranial abdomen may distend the jugular vein due to excessive venous return to the right heart. What is the name of this maneuver?
The hepatojugular reflux test
What are expected serum biochemical changes in dogs with xylitol toxicosis (sugar-free gum/mint ingestion)?
Hypoglycemia, markedly increased liver enzymes, hyperphosphatemia
With respiratory alkalosis, which organ is responsible for the primary disturbance, and which organ is responsible for the compensatory response?
Primary disturbance: Lungs
Compensatory response: Kidneys
What is the purpose of an anti-scatter grid in radiography?
Prevent degradation of image quality due to scatter radiation
In reference to direction of blood flow on standard color Doppler, which color shows flow toward the probe, and which shows flow away from the probe?
Blue = Away
Red = Towards
(aka the BART rule)
In the presence of anti-thyroxine (T4) antibodies, will the measures total T4 be higher or lower than the actual total T4?
Higher.
Anti-T4 antibodies bind reagent in vitro and trigger a falsely elevated reading.
Animals that have prolonged activated partial thromboplastin and activated clotting times, but do not have a bleeding disorder, may have a deficiency of which coagulation factor?
XII
Consequently, it is generally accepted that the factor XII is not involved in normal hemostasis
Name a major contraindication for the administration of intravenous contrast medium.
Dehydration or hypersensitivity
Why is CSF tap contraindicated in a patient with clinical signs of increased intracranial pressure?
Increased risk of brain herniation
A radiograph of a 6 month-old dog’s elbow indicates a radiolucent defect in the humeral condyle above the medial ulnar coronoid process. What are the radiographic diagnosis and treatment of choice?
Osteochondrosis. This is a component of elbow dysplasia, which can lead to degenerative joint disease. Surgical removal of the cartilage flap is the treatment of choice.
In diagnostic ultrasound, which property of materials allows for an echo to be formed at the boundary of two different tissues?
Acoustic impedance
A prolonged prothrombin time (PT), normal activated partial thromboplastin time (aPTT), and a normal thrombin time (TT) fit with an abnormality in which part of the coagulation cascade - common, extrinsic, or intrinsic?
Extrinsic
An electrocardiogram shows QRS complexes without P waves. Name 3 of the 5 differential diagnoses.
1) Atrial standstill (hyperkalemia or primary atrial myopathy)
2) Atrial fibrillation
3) Atrial flutter
4) Premature ventricular complexes/Ventricular tachycardia
5) Isoelectric P waves
In ethylene glycol toxicosis, there may be a large difference between osmole concentration measured directly in the blood, versus calculated. Name the 4 major blood osmoles. What is the name of the difference between measured and calculated values?
Sodium, potassium, glucose and blood urea nitrogen.
Osmole gap (abnormally high in ethylene glycol toxicosis because serum ethylene glycol registers during direct measurement of osmolality but is not part of the calculated value)
For ophthalmoscopy, which gives a more complete view of the whole fundus: Direct of indirect?
Indirect ophthalmoscopy (lens held in hand) provides a more complete view of the fundus, It also allows visualization through both eyes using a headset, and distances the observer from a patient that chooses to bite or head-butt without warning.
Hyphema makes it impossible to see a patient’s posterior chamber. Ultrasound reveals an undulating membrane tracing a wavelike course through the posterior chamber. What is the diagnosis?
Retinal detachment
In a majority of cases, cytologic analysis of pericardial effusion in dogs is diagnostic for the underlying cause: true or false?
False. 74% of malignancies are not detected, and 13% of benign disorders are misdiagnosed as malignant, when cytology alone is used.
What is the normal size of the feline kidney as compared to the length of the body of L2 in abdominal radiographs?
2-3 times the length of the second lumbar vertebra
What is the radiographic hallmark of feline bronchial disease?
Peribronchial cuffing, caused by infiltration of inflammatory cells around the airways
Which changes from normal are expected in a dog with psychogenic polydipsia for: Urine osmolality, plasma osmolality, urine osmolality after water deprivation, and plasma vasopressin after water deprivation?
1) Urine osmolality: Decreased
2) Plasma osmolality: Normal or decreased
3) Urine osmolality after water deprivation: Increased
4) Plasma vasopressin after water deprivation: Normal or high
Why is lidocaine ineffective when administered orally?
High first-pass effect (hepatic metabolism of drug immediately when absorbed from the GI tract and transported through the portal circulation).
Cytology of swab samples from the oral cavity and liver of a pigeon carcass reveals flagellate protozoa with an undulating membrane and axostyle. What is the most likely diagnosis?
Trichomoniasis (Trichomonas columbae)