1
Q
A
2
Q
A
3
Q
What is the primary challenge in conducting studies on platelet-rich plasma and autologous conditioned sera?
A
Design and execution of multicenter, controlled, blinded clinical trials
These studies require sufficient power and objective outcome measures.
4
Q
What are the two major compartments of total body water?
A
- Intracellular fluid
- Extracellular fluid
Each compartment consists of solutes, primarily electrolytes, dissolved in water.
5
Q
What percentage of body weight does water constitute in the nonobese adult dog or cat?
A
Approximately 60%
Total body water decreases with age, acute exercise, obesity, and high altitudes.
6
Q
What is the major cation in the intracellular fluid?
A
K+
Other contributions include Mg++ and Na+.
7
Q
The extracellular fluid is subdivided into what two compartments?
A
- Plasma
- Interstitial fluid
Plasma is considered synonymous with intravascular and makes up 25% of extracellular fluid.
8
Q
What is the role of the Na+-K+/ATPase protein?
A
Extrudes Na+ from the cell and transports K+ into the cell
This process consumes ATP and contributes to concentration gradients.
9
Q
True or false: The capillary membrane is freely permeable to water and small-molecular-weight particles.
A
TRUE
It allows the passage of ions, glucose, and gases like oxygen and carbon dioxide.
10
Q
What is the function of the glycocalyx in the capillary endothelium?
A
Modulates interactions with plasma components
It has a net negative charge that acts as a sieve affecting permeability.
11
Q
What historical figure is known for pioneering fluid therapy in the 19th century?
A
Albert Landerer
He was among the first to use intravenous fluids and other methods for surgical patients.
12
Q
What can inadequate intravascular volume lead to in patients?
A
- Hypotension
- Tissue hypoxia
- Organ failure
- Death
Maintaining hydration is crucial for postoperative recovery.
13
Q
What is the recommended approach for investigators studying platelet-rich plasma?
A
Include a thorough description of methods and report characteristics
This helps in understanding the efficacy of treatments.
14
Q
What is the title of the paper presented at the annual conference of the Veterinary Orthopedic Society in 2016?
A
Assessment of canine autologous platelet-rich plasma produced with a commercial centrifugation and platelet recovery kit
Authors: Enders A, Brooks MB, et al.
15
Q
In what journal was the study on canine autologous platelet-rich plasma published in 2016?
A
Vet Comp Orthop Traumatol
Volume 29, Issue 1, Pages 14–19.
16
Q
What is the focus of the study by Gianakos A, et al. regarding platelet-rich plasma?
A
Analysis of basic science evidence in the animal long-bone model
Published in Orthopedics, Volume 38, Issue 12.
17
Q
What role do cytokines play in osteoarthritis and cartilage according to Goldring MB?
A
They are involved in the pathology of osteoarthritis
Published in Curr Rheumatol Rep, Volume 2, Issue 6.
18
Q
What technique is discussed by Gonshor A in relation to platelet-rich plasma?
A
Technique for producing platelet-rich plasma and platelet concentrate
Published in Int J Periodontics Restorative Dent, Volume 22, Issue 6.
19
Q
What is the main topic of the study by Grant WP, et al. regarding autologous growth factors?
A
Facilitation of fusion in complex neuropathic fractures in the diabetic population
Published in Clin Podiatr Med Surg, Volume 22, Issue 4.
20
Q
What did Griffin XL, et al. conduct a systematic review on regarding platelet-rich plasma?
A
Clinical use in the promotion of bone healing
Published in Injury, Volume 40, Issue 2.
21
Q
What mechanism is involved in the stimulation of osteoclast-like cells by platelet-released supernatants according to Gruber R, et al.?
A
Prostaglandin/RANKL-dependent mechanism
Published in Bone, Volume 30, Issue 5.
22
Q
What effects do IL-6 and its soluble receptor have on proteoglycan synthesis according to Guerne PA, et al.?
A
Modulation by dexamethasone
Published in Matrix Biol, Volume 18, Issue 3.
23
Q
What is the focus of the study by Hegemann N, et al. regarding canine immune-mediated polyarthritis?
A
Cytokine profile
Published in Vet Comp Orthop Traumatol, Volume 18, Issue 2.
24
Q
What is the significance of the study by Ho LK, et al. on platelet-rich plasma injection?
A
Treatment of supraspinatus tendinopathy in dogs
Published in Can Vet J, Volume 56, Issue 8.
25
What does the study by Hraha TH, et al. compare in terms of **cytokine profiles**?
Two commercial methods (IRAP and IRAP II) using equine blood
## Footnote
Published in Equine Vet J, Volume 43, Issue 5.
26
What did Huggins SS, et al. measure in healthy dogs after using an **autologous serum processing system**?
Serum concentrations of canine interleukin-1 receptor antagonist protein
## Footnote
Published in Res Vet Sci, Volume 101.
27
What does the study by Kajikawa Y, et al. suggest about **platelet-rich plasma**?
Enhances the initial mobilization of circulation-derived cells for tendon healing
## Footnote
Published in J Cell Physiol, Volume 215, Issue 3.
28
What was compared in the study by Kevy SV, et al. regarding **autologous platelet gel**?
Methods for point of care preparation
## Footnote
Published in J Extra Corpor Technol, Volume 36, Issue 1.
29
What effect does TGF-beta have on **flexor tendon healing** according to Klein MB, et al.?
Effects on tendon cell collagen production
## Footnote
Published in J Hand Surg Am, Volume 27, Issue 4.
30
What is the focus of the study by Lemos CAA, et al. regarding **platelet-rich plasma**?
Effects in association with bone grafts in maxillary sinus augmentation
## Footnote
Published in Int J Oral Maxillofac Surg, Volume 45, Issue 4.
31
What is the subject of the systematic review by Liddle AD, et al. on **platelet-rich plasma**?
Treatment of patellar tendinopathy
## Footnote
Published in Am J Sports Med, Volume 43, Issue 10.
32
What is the relationship between **fibroblast proliferation** and pH according to Liu YW, et al.?
Proliferation due to exposure to a platelet concentrate is pH dependent
## Footnote
Published in Wound Repair Regen, Volume 10, Issue 5.
33
What do **platelet-derived growth factors** enhance according to Lucarelli E, et al.?
Proliferation of human stromal stem cells
## Footnote
Published in Biomaterials, Volume 24, Issue 18.
34
What is the **total body water (TBW)** fluid compartment distribution?
* Extracellular fluid (1/3 total body water)
* Intracellular fluid (2/3 total body water)
## Footnote
This distribution is crucial for understanding fluid therapy in animals.
35
What should the sodium concentration in the blood not be increased or decreased by in animals with chronic hyponatremia or hypernatremia?
* Increased by more than 0.5 mEq/h
* Decreased by more than 1 mEq/h
## Footnote
These limits help prevent nervous system derangements.
36
What are the effects of **hypertonic fluid losses**?
* Intracellular fluid becomes hypertonic to extracellular fluid
* Movement of water from extracellular fluid to intracellular fluid
* Subsequent extracellular fluid dehydration
## Footnote
This can lead to significant physiological imbalances.
37
What is the result of **isotonic fluid losses**?
* No fluid shifts between extracellular and intracellular fluid
* Dehydration (volume depletion) of extracellular fluid
## Footnote
This type of loss can lead to clinical signs of dehydration.
38
What clinical signs are associated with **intravascular volume deficits**?
* Compensatory vasoconstriction
* Pale mucous membranes
* Poor pulse quality
* Tachycardia
* Prolonged capillary refill time
* Cold extremities
## Footnote
These signs indicate poor tissue perfusion and require rapid treatment.
39
What laboratory findings are commonly seen in animals with **intravascular dehydration**?
* Elevated packed cell volume
* Elevated total protein
* Elevated urine specific gravity
## Footnote
These findings help in diagnosing dehydration, except in cases of recent hemorrhage or preexisting anemia.
40
What is **prerenal azotemia** characterized by?
* Elevated blood urea nitrogen level
* Elevated creatinine level
* Concentrated urine (specific gravity >1.030)
## Footnote
This condition may be observed in moderately or severely dehydrated animals.
41
What happens during a **cytokine-mediated increase** in vascular endothelial permeability?
* Damage to the vascular endothelium
* Degradation of the glycocalyx layer
* Increased transvascular flux of high-protein, isotonic fluid into the extravascular space
## Footnote
This is particularly relevant in animals with systemic inflammatory response syndrome (SIRS).
42
What clinical evidence is often seen in animals with **nonpitting edema** despite intravascular volume depletion?
* Evidence of nonpitting edema in the interstitial space
## Footnote
This condition complicates the treatment of hypovolemia and hypoproteinemia.
43
What is one of the earliest sites damaged during **SIRS** thought to be mediated by?
* Tumor necrosis factor-alpha
* Bacterial lipopolysaccharide
## Footnote
The degradation of the glycocalyx layer can exacerbate transvascular flux of high-protein, isotonic fluid.
44
What are the clinical signs of animals with evidence of **dehydration**?
* Decreased skin turgor
* Dry mucous membranes
* Eyes may be sunken in orbits
* Prolonged capillary refill time
* Signs of shock
## Footnote
Physical examination findings vary with the percentage of dehydration.
45
The formula for calculating fluid amount to be given over the next 6 to 24 hours includes which components?
* Deficit (Body weight in kg × Percent dehydration)
* Estimated ongoing losses
* Maintenance
## Footnote
This formula helps in determining the total fluid requirements for dehydrated patients.
46
True or false: **Dehydration** is defined as the loss of bodily fluids.
TRUE
## Footnote
Dehydration can cause changes in all fluid compartments, depending on the type of fluid lost.
47
What is the primary cation in the **extracellular fluid**?
Na+
## Footnote
Major anions include Cl− and HCO3−, with proteins also contributing to negative charges.
48
What factors determine the **movement of fluids** across the capillary endothelial membrane?
* Increased intravascular oncotic pressure
* Decreased intravascular hydrostatic pressure
* Decreased intravascular oncotic pressure
* Increased intravascular hydrostatic pressure
## Footnote
These forces favor either reabsorption or filtration of fluids.
49
What are the **daily fluid requirements** for animals based on?
* Urinary losses
* Fecal losses
* Salivary losses
* Respiratory losses
* Cutaneous losses
## Footnote
Daily maintenance fluid volume requirements vary widely among species, ages, and other factors.
50
What is the cornerstone of therapy for **noncardiogenic shock**?
Aggressive volume resuscitation
## Footnote
Increasing intravascular volume helps restore organ perfusion and oxygen delivery to tissues.
51
What is the recommended initial rate of **crystalloids** for dogs during anesthesia?
5 mL/kg/h
## Footnote
Cats should start at 3 mL/kg/h, based on veterinary guidelines.
52
What are the key recommendations for managing **septic patients** during the first 6 hours after recognition?
* Early quantitative resuscitation
* Early sample collection for culture
* Administration of broad-spectrum antimicrobials
* Early administration of norepinephrine
* Close monitoring of global indices of perfusion
## Footnote
These recommendations are part of the 2012 Surviving Sepsis Guidelines.
53
What is the effect of **hypotonic fluid losses** on extracellular fluid tonicity?
Increases extracellular fluid tonicity
## Footnote
This leads to fluid shifts from intracellular fluid to extracellular fluid to establish iso-osmolarity.
54
What is the initial fluid rate for **dogs** during fluid therapy?
5 mL/kg/h of crystalloids
## Footnote
Current veterinary guidelines recommend this rate for dogs.
55
What is the initial fluid rate for **cats** during fluid therapy?
3 mL/kg/h of crystalloids
## Footnote
This rate is specified in current veterinary guidelines.
56
What vital signs should be monitored to ensure adequate **tissue perfusion** and oxygen delivery?
* Blood pressure
* Pulse oximetry readings
* Animal's vital signs
## Footnote
Close monitoring is crucial during and after surgery.
57
Following surgery, what should be adjusted to maintain hydration and replace ongoing losses?
Fluid requirements
## Footnote
This is important as the animal wakes up and anesthesia effects wane.
58
What types of fluids are commonly used in surgical patients?
* Isotonic crystalloids
* Hypotonic crystalloids
* Hypertonic crystalloids
* Synthetic colloids
* Blood products
## Footnote
These fluids are categorized based on tonicity and electrolyte composition.
59
Define **isotonic crystalloids**.
Electrolyte-containing fluids with osmolarity similar to plasma (290 to 310 mOsm/L)
## Footnote
They are used to expand the intravascular and interstitial spaces.
60
What is the typical shock dose for dogs and cats?
* Dogs: 90 mL/kg
* Cats: 50 mL/kg
## Footnote
However, large doses are no longer recommended.
61
What can excessive fluid administration lead to in surgical patients?
* Interstitial edema
* Pulmonary edema
* Cerebral edema
* Decreased oxygen delivery
## Footnote
These complications can severely affect organ function.
62
What is the osmolarity of **0.9% NaCl**?
308 mOsm/L
## Footnote
It is commonly used but can cause electrolyte imbalances.
63
What is the benefit of **0.9% NaCl** for surgical patients with hypochloremic metabolic alkalosis?
Helps to normalize blood pH by dilution and increased chloride levels
## Footnote
This fluid is the highest in chloride content.
64
What are **maintenance fluids**?
Hypotonic fluids needed to maintain total body water and electrolyte content
## Footnote
They are especially useful for stable perioperative patients.
65
What is the osmolarity of **D5W**?
252 mOsm/L
## Footnote
It is safe for intravenous administration and indicated for free water deficit.
66
What is the effect of administering **hypertonic saline**?
Causes a transient osmotic shift of water from the extravascular to the intravascular compartment
## Footnote
It is useful for treating head trauma or cardiovascular issues.
67
True or false: **Excessive crystalloid administration** can lead to hypoproteinemia.
TRUE
## Footnote
It can also lead to anemia and hypocoagulability.
68
What is the primary use of **hypertonic saline**?
* Vasodilation
* Modulate inflammation
* Decrease intracranial pressure
## Footnote
Hypertonic saline is especially useful for the treatment of head trauma or cardiovascular shock in animals.
69
What is the osmolarity of **7.5% NaCl**?
1250 mOsm/L
## Footnote
This is one of the hypertonic fluids listed for resuscitation.
70
What are the potential risks of administering **hypertonic saline**?
* Increase in sodium and chloride concentrations
* Decrease in potassium and bicarbonate concentrations
* Risk of hemolysis and phlebitis
## Footnote
These changes are typically moderate but can be significant in animals with preexisting electrolyte derangements.
71
True or false: **Hypertonic saline** should be given to dehydrated animals.
FALSE
## Footnote
Dehydrated animals are interstitially volume depleted, limiting the effectiveness of hypertonic saline.
72
What are **synthetic colloid solutions** primarily composed of?
* Large molecules (molecular weight >20,000 daltons)
* Isotonic crystalloid fluid
## Footnote
These solutions increase colloid osmotic pressure and pull fluid into the intravascular space.
73
What is the purpose of administering **synthetic colloid solutions**?
* Treatment of shock
* Moderate to severe hypoproteinemia
* Postoperative fluid loss recovery
## Footnote
They help retain fluid in the intravascular space and improve tissue perfusion.
74
What is the **polydispersity index**?
Ratio of weight average molecular weight to number average molecular weight
## Footnote
It indicates the breadth of the molecular weight range of a synthetic colloid solution.
75
List the primary types of **synthetic colloid solutions** available.
* Dextrans
* Gelatins
* Hemoglobin-based oxygen carriers
* Hydroxyethyl starches
## Footnote
These are commonly used in veterinary medicine.
76
What are the potential side effects of **synthetic colloids**?
* Decrease in factor VIII and von Willebrand factor concentrations
* Impairment of platelet function
* Interference with fibrin clot stability
## Footnote
These effects can lead to coagulopathy.
77
What is the **C2/C6 ratio** in hydroxyethyl starch solutions?
Ratio of substitution at the C2 versus C6 position
## Footnote
This ratio influences the half-life of the solution and its effects on coagulation.
78
What is the recommended dosing for **synthetic colloids** in animals with acute hypoproteinemia?
0.5 to 2 mL/kg/day
## Footnote
A total dose of <20 mL/kg/day is advised to avoid side effects.
79
What is the **osmolarity** of **Oxyglobin**?
300 mOsm/L
## Footnote
Oxyglobin is a hemoglobin-based oxygen-carrying fluid used in small animals.
80
What is the **plasma half-life** of Oxyglobin?
18 to 43 hours
## Footnote
This depends on the dose administered (10 to 30 mL/kg).
81
What color does **Oxyglobin** cause in an animal's skin and urine?
Yellow-orange discoloration
## Footnote
This is due to the presence of polymerized bovine hemoglobin.
82
What is the **recommended dose** of Oxyglobin for dogs?
10 to 30 mL/kg
## Footnote
Oxyglobin can be lifesaving in cases of severe, acute anemia.
83
How long can Oxyglobin be stored at **room temperature**?
Up to 3 years
## Footnote
An open bag must be used within 24 hours.
84
What color is Oxyglobin and what discoloration does it cause?
Purple; yellow-orange discoloration
## Footnote
This affects the animal’s skin, urine, serum, sclera, and mucous membranes.
85
True or false: The **hematocrit** of the animal is unaffected by Oxyglobin.
TRUE
## Footnote
Hemoglobin levels must be measured to estimate oxygen-carrying capacity.
86
What are some **medical concerns** regarding Oxyglobin?
* Marked vasoconstriction
* Not superior to natural blood products
* May be more expensive
## Footnote
These concerns have been raised despite its lifesaving potential.
87
What is the **acute blood loss** threshold that often requires transfusion therapy?
Exceeding 20% of blood volume
## Footnote
In addition to crystalloid and colloid therapy.
88
What is the **target hematocrit** for surgical patients with hypotension despite fluid therapy?
>30%
## Footnote
This is to maximize oxygen-carrying capacity.
89
What is **autologous blood donation**?
Donating blood in advance for elective surgery
## Footnote
This ensures blood is available for the patient during surgery.
90
What is **acute normovolemic hemodilution**?
Collecting blood before surgery and replacing it with isotonic crystalloid or colloid solution
## Footnote
This technique is based on the premise of minimizing blood loss during surgery.
91
What is the **shelf life** of packed red blood cells when stored at 4°C?
20 days (extendable to 35 days with additives)
## Footnote
They are administered to animals with acute decreases in hematocrit.
92
What components does **fresh whole blood** contain?
* Clotting factors
* Platelets
## Footnote
Platelets are best administered within 8 hours of collection.
93
What is the **administration dose** for packed red blood cells?
10 to 15 mL/kg
## Footnote
Fresh whole blood is administered at 20 to 25 mL/kg.
94
What is the formula for calculating the volume of packed red blood cells to be transfused (VT)?
VT (mL) = kg BW × blood volume × [(desired PCV − recipient PCV) / Donor PCV]
## Footnote
BW = body weight, PCV = packed cell volume.
95
What does **cryoprecipitate** contain?
* Factor VIII
* von Willebrand factor
* Fibrinogen
## Footnote
It may be beneficial for animals with known deficiencies.
96
What is the **definition** of fresh frozen plasma?
Plasma frozen within 6 hours of collection
## Footnote
It is stored at a temperature below 20°C for less than 1 year.
97
What is the **goal** of platelet transfusion therapy?
Stop or prevent potentially life-threatening bleeding
## Footnote
Not to increase platelet numbers per se.
98
What is the **total amount of whole blood required** dependent on?
* Platelet count of the patient (PE)
* Platelet count of the donor (PD)
* Target platelet count (Pt)
* Blood volume (BV)
## Footnote
This formula helps determine the necessary transfusion volume.
99
How many commonly identified **dog erythrocytic antigens** are known?
Eight
## Footnote
Approximately 15% of first-time canine blood transfusions may cause adverse immunologic reactions.
100
What are the two commonly identified **red blood cell antigens** in domestic felines?
* A
* B
## Footnote
Most domestic shorthairs in the U.S. are type A, while certain breeds are more commonly type B.
101
Type A blood given to a type B cat is associated with a decreased red blood cell life span of approximately _______.
1 hour
## Footnote
Type B cats often have strong naturally occurring anti-A antibodies.
102
What is the recommended action before all feline red blood cell transfusions?
Cross-matching
## Footnote
This is due to potential transfusion reactions and decreased posttransfusion red blood cell survival.
103
What is the ideal storage temperature for whole blood and packed red blood cells?
4°C ± 2°C
## Footnote
This temperature allows storage for up to 35 days.
104
What anticoagulant is used for blood component preparation?
Citrate phosphate dextrose adenine (CPDA)-1
## Footnote
Proper storage is vital to ensure efficacy and prevent contamination.
105
What should be done with blood components that have been warmed to room or body temperature?
They should not be recooled or stored again
## Footnote
This is due to concerns about product quality and safety.
106
What are the most commonly seen **transfusion reactions** in dogs and cats?
* Transfusion-associated circulatory overload (TACO)
* Nonhemolytic febrile reactions
## Footnote
TACO may occur due to fluid overload from blood products.
107
What is the most common cause of human mortality secondary to blood transfusions?
Transfusion-related acute lung injury (TRALI)
## Footnote
TRALI is defined as respiratory distress within 24 hours of a transfusion.
108
What should be monitored immediately after the commencement of a blood transfusion?
Signs of a transfusion reaction
## Footnote
Possible signs include fever, restlessness, and acute collapse.
109
True or false: Autotransfusion of whole blood is a dependable source of clotting factors.
FALSE
## Footnote
Depletion of fibrin and other clotting factors occurs rapidly after hemorrhage.
110
What is the purpose of cell saver techniques in autotransfusion?
To collect and return shed blood mixed with an anticoagulant
## Footnote
This method is typically used in people with massive intraoperative blood loss.
111
What is the potential adverse effect of administering **25% human albumin**?
Acute or delayed hypersensitivity reactions
## Footnote
It may also cause volume overload and coagulopathy.
112
What is the effect of human albumin administration in dogs?
Increases circulating albumin concentrations
## Footnote
Its effect on mortality remains unknown.
113
What is the **primary extracellular cation** in the body?
Sodium
## Footnote
Sodium is maintained by the sodium-potassium ATPase on the cellular membrane.
114
What condition is defined as a serum sodium concentration less than **140 mEq/L** in dogs?
Hyponatremia
## Footnote
In cats, hyponatremia is defined as less than 149 mEq/L.
115
What are the **primary mechanisms** responsible for free water balance in the body?
* Vasopressin (antidiuretic hormone) release
* Thirst
## Footnote
These mechanisms respond to increased plasma osmolarity or hypovolemia.
116
True or false: **Hyponatremia** can occur in conditions of low plasma osmolarity, high plasma osmolarity, or normal plasma osmolarity.
TRUE
## Footnote
Hyponatremia can be influenced by various factors including hyperlipidemia or hyperproteinemia.
117
What is **pseudohyponatremia**?
A measurement problem rather than a true decrease in serum sodium
## Footnote
It can occur due to hyperlipidemia or hyperproteinemia.
118
What are the **causes of hyponatremia** in hypovolemic conditions?
* Gastrointestinal loss
* Hypoadrenocorticism
* Diuretic administration
## Footnote
Impaired water excretion by the kidneys is a key factor.
119
What is the definition of **hypernatremia**?
Serum sodium concentration greater than 150 mEq/L in dogs
## Footnote
In cats, hypernatremia is defined as greater than 160 mEq/L.
120
What are the **causes of hypernatremia**?
* Free water loss
* Increased sodium ingestion
## Footnote
Increased sodium ingestion is uncommon but can occur with certain substances.
121
What clinical signs are associated with **acute hyponatremia**?
* Central nervous system depression
* Ataxia
* Coma
* Seizures
## Footnote
These signs are due to cerebral edema from fluid shifts.
122
What should be monitored when correcting **chronic hyponatremia**?
Sodium concentrations
## Footnote
Correction should be done slowly to avoid osmotic demyelination syndrome.
123
What is the effect of **aldosterone** on sodium and water?
Stimulates increased renal reabsorption of sodium and water
## Footnote
Aldosterone levels increase in response to decreased extracellular fluid volume.
124
What is the **normal serum sodium concentration** range for dogs?
140-150 mEq/L
## Footnote
Values below this indicate hyponatremia.
125
What is a potential risk of administering **human albumin** to dogs?
* Acute or delayed hypersensitivity reactions
* Volume overload
* Coagulopathy
## Footnote
Increased IgG against human albumin occurs with repeated exposures.
126
What is the **primary determinant of extracellular osmolarity**?
Sodium
## Footnote
Serum sodium concentration reflects sodium content relative to extracellular water.
127
What is the role of the **juxtaglomerular apparatus** in sodium regulation?
Senses decreased extracellular fluid volume and releases renin
## Footnote
This leads to increased serum aldosterone levels.
128
What is the consequence of **rapid correction** of chronic hyponatremia?
Osmotic demyelination syndrome
## Footnote
This can occur if sodium concentration increases more quickly than 0.5 mEq/L/h.
129
What are the **clinical signs of hypernatremia**?
* Anorexia
* Lethargy
* Vomiting
* Muscle weakness
## Footnote
Signs are related to neuronal dehydration and fluid shifts.
130
What is **neuronal dehydration** secondary to?
Fluid shifts out of the intracellular compartment
## Footnote
Chronic hypernatremia allows neuronal cells to accumulate idiogenic osmoles to maintain osmolarity.
131
What can result from **tissue shrinkage** in the brain?
Vascular damage and hemorrhage
## Footnote
Neuronal dehydration and intracranial hemorrhage can lead to various clinical signs.
132
List some **clinical signs** of neuronal dehydration and intracranial hemorrhage.
* Anorexia
* Lethargy
* Vomiting
* Muscle weakness
* Vocalization
* Ataxia
* Seizures
* Coma
* Death
## Footnote
Patients with hypovolemic hypernatremia will also show signs of hypovolemia.
133
How should **serum sodium concentration** be corrected in acute hypernatremia?
Rapidly
## Footnote
In chronic hypernatremia, it should be corrected slowly to prevent cerebral edema.
134
In chronic hypernatremia, the serum sodium concentration should not be lowered more rapidly than _______.
0.5 mEq/L/h
## Footnote
This is crucial to prevent complications during treatment.
135
What are the **goals of treatment** for hypernatremia?
* Replacing fluid and electrolyte losses
* Encouraging sodium excretion
* Treating underlying causes
## Footnote
Hypovolemic patients should be stabilized by replacing their intravascular volume deficit.
136
What type of fluids should be used to stabilize **hypovolemic patients**?
Crystalloids that are isotonic to the patient
## Footnote
After resuscitation, correction of the sodium deficit is done with free water.
137
How is the **free water deficit** calculated?
Free water deficit (L) = 0.6 × weight (kg) × ([Na⁺]present - [Na⁺]normal)
## Footnote
This formula helps determine the amount of free water needed for correction.
138
What is the most common method to replace **free water**?
5% dextrose in water intravenously
## Footnote
Dextrose is rapidly metabolized, leaving only free water for replacement.
139
What alternative methods can be used to provide free water?
* Orally
* Through a feeding tube
## Footnote
Caution should be exercised to prevent rapid shifts in osmolarity.
140
What can **loop diuretics** facilitate in hypervolemic hypernatremia?
Natriuresis
## Footnote
This helps in the management of sodium levels in affected animals.
141
What is the major **intracellular cation** in the body?
Potassium
## Footnote
Approximately 95% of total body potassium is contained in the cells.
142
What maintains high intracellular **potassium concentrations**?
Na+-K+/ATPase pump
## Footnote
This pump is located in the cell membrane.
143
What is the typical **resting membrane potential** inside the cell?
−90 mV
## Footnote
This negative charge is due to the high concentration of potassium inside the cell.
144
What is the normal range for **extracellular potassium concentration**?
3.5 to 5.5 mEq/L
## Footnote
Changes in this concentration affect cell membrane potential and excitability.
145
What factors influence **potassium balance** in the body?
* Intake through the gastrointestinal tract
* Excretion via the kidneys
* Transcellular distribution
## Footnote
Aldosterone influences potassium excretion by the kidneys.
146
What are common causes of **hypokalemia**?
* Decreased intake
* Increased renal loss
* Gastrointestinal loss
* Translocation into intracellular compartment
## Footnote
Specific causes include chronic renal failure and excessive vomiting.
147
What are the clinical signs of **hypokalemia** when serum potassium concentrations are less than 3.0 mEq/L?
* Muscle weakness
* Cardiac arrhythmias
* Polyuria
## Footnote
Severe hypokalemia (<2.0 mEq/L) can lead to rhabdomyolysis and respiratory muscle paralysis.
148
What is the recommended **maximum potassium infusion rate** for intravenous supplementation?
0.5 mEq/kg/h
## Footnote
This should be monitored to avoid potential cardiotoxic effects.
149
What can cause **hyperkalemia**?
* Decreased potassium excretion
* Increased intake
* Altered distribution from cells to extracellular fluid
## Footnote
Common causes include renal failure and iatrogenic overadministration of potassium.
150
What are the **causes of hyperkalemia** listed in Box 5.4?
* Decreased urinary excretion
* Translocation
* Increased intake
* Pseudohyperkalemia
## Footnote
Specific conditions include urethral obstruction and tissue trauma.
151
What are the **electrocardiographic changes** associated with severe hyperkalemia?
* Spiked T-waves
* Prolonged PR interval
* Widening of QRS complex
* Disappearance of P-wave
## Footnote
These changes occur as potassium concentrations increase.
152
True or false: **Hypokalemia** is more commonly recognized in cats than in dogs.
TRUE
## Footnote
Hypokalemia may contribute to a further decline in renal function in cats.
153
What is the effect of **insulin** on potassium levels?
Translocates potassium into the intracellular space
## Footnote
Insulin administration can lead to hypokalemia.
154
Fill in the blank: **Hypokalemia** may be due to decreased total body potassium or _______.
translocation of potassium
## Footnote
This can occur from extracellular to intracellular space.
155
What happens to the **QT interval** when potassium levels are between 7.0 and 8.5 mEq/L?
Shortening of the QT interval
## Footnote
Prolongation of the PR interval and widening of the QRS may occur at these potassium levels.
156
At potassium levels above **8.5 mEq/L**, what changes occur in the ECG?
* P-wave disappears
* R-wave amplitude decreases
* S-wave prominence increases
* Asystole and ventricular fibrillation can occur
## Footnote
These changes may not always be present due to other electrolyte and acid-base disturbances.
157
What is the **treatment** for mild hyperkalemia?
* Resolution of the underlying cause
* Intravenous fluid therapy with potassium-deficient fluids
## Footnote
Severe hyperkalemia may require additional treatments.
158
What is the role of **calcium gluconate** in treating severe hyperkalemia?
* Alters electrical environment of cardiac myocyte
* Raises threshold membrane potential
* Rapid onset of action (within minutes)
* Effects last approximately 1 hour
## Footnote
Life-threatening bradycardia can develop if administered too rapidly.
159
What is the dose of **intravenous dextrose** for treating hyperkalemia?
0.5 to 1 g/kg
## Footnote
It can be given with or without exogenous insulin (0.5 to 1 IU/kg).
160
What are the **three hormones** that regulate calcium levels in the body?
* Parathyroid hormone
* Vitamin D (cholecalciferol)
* Calcitonin
## Footnote
They act at the kidney, intestine, and bone to regulate calcium balance.
161
What is **hypocalcemia**?
Occurs when losses exceed the body's ability to mobilize calcium
## Footnote
It can result from impaired parathyroid hormone release, vitamin D synthesis, or chelation/precipitation of calcium.
162
What are the causes of **hypocalcemia** listed in Box 5.5?
* Decreased Parathyroid Hormone Release
* Decreased Vitamin D Synthesis
* Chelation/Precipitation of Calcium
* Critical Illness
## Footnote
Each category includes specific conditions leading to hypocalcemia.
163
What is the most common cause of **hypercalcemia** in dogs?
Malignancy
## Footnote
This is typically mediated by paraneoplastic production of parathyroid hormone–related peptide.
164
What are the clinical signs of **hypercalcemia**?
* Depression
* Lethargy
* Coma or seizures (in severe cases)
* Muscle weakness
* Polyuria and polydipsia
* Vomiting
* Anorexia
## Footnote
Cardiovascular abnormalities can be life-threatening.
165
What is the **treatment** for hypercalcemia?
Warranted in clinically affected patients
## Footnote
Treatment options depend on the severity of total calcium levels.
166
What is the most **life-threatening** condition related to calcium levels in patients requiring general anesthesia?
Hypercalcemia
## Footnote
Hypercalcemia can cause cardiac arrhythmias and hypertension.
167
List the **causes of hypercalcemia**.
* Malignancy
* Renal Failure
* Hypoadrenocorticism
* Hypervitaminosis D
* Granulomatous Disease
* Nonmalignant Bone Disease
* Primary Hyperparathyroidism
* Idiopathic
* Spurious
## Footnote
Each cause can lead to elevated calcium levels in the body.
168
What is the **treatment** for hypercalcemia?
* Address underlying cause
* Intravenous fluid therapy
* Loop diuretics (furosemide)
* Glucocorticoids
* Bisphosphonates
* Calcitonin
* Sodium bicarbonate
* Low-calcium diets
* Calcium channel blockers
## Footnote
Treatment depends on severity, clinical signs, and cause.
169
What percentage of magnesium in the body is **intracellular**?
99%
## Footnote
Only 1% is found in the extracellular space.
170
What are the **forms** in which serum magnesium is found?
* Protein bound
* Chelated
* Ionized
## Footnote
Ionized magnesium is believed to be the physiologically active fraction.
171
What is **hypomagnesemia** defined as in dogs?
Less than 1.7 mg/dL
## Footnote
In cats, it is defined as less than 1.8 mg/dL.
172
List the **clinical signs** of hypomagnesemia.
* Ventricular arrhythmias
* Atrial arrhythmias
* Hypertension
* Muscular weakness
* Hyperesthesia
* Muscle tremors
* Ataxia
* CNS depression
* Seizures
* Nausea
* Anorexia
## Footnote
Clinical signs may be due to hypomagnesemia or related disorders.
173
What is the **treatment** for hypomagnesemia?
* Magnesium sulfate
* Magnesium chloride solutions
* Constant rate infusion in 5% dextrose in water
## Footnote
For life-threatening arrhythmias, magnesium can be given intravenously while monitoring ECG.
174
What is the most common cause of **hypermagnesemia**?
Renal failure
## Footnote
The degree of hypermagnesemia parallels the degree of renal dysfunction.
175
What are the **causes of hypophosphatemia**?
* Increased renal loss
* Decreased gastrointestinal absorption
* Translocation into intracellular compartment
## Footnote
Each cause can lead to low phosphorus levels in the body.
176
What is **hypophosphatemia** defined as?
Levels lower than 2.5 mg/dL
## Footnote
Severe hypophosphatemia can lead to life-threatening conditions.
177
List the **clinical signs** of severe hypophosphatemia.
* Weakness
* Coma
* Tremors
* Seizures
* Acute respiratory failure
* Cardiac arrhythmias
## Footnote
Most dogs may not develop hemolysis due to their red blood cell regulation system.
178
What is the **normal range** of ionized magnesium in dogs?
1.07 to 1.46 mg/dL
## Footnote
This range is important for assessing magnesium levels in veterinary patients.
179
What is **hypophosphatemia**?
A condition characterized by low phosphorus levels in the blood
## Footnote
Treatment includes correction of underlying causes and supplementation with potassium or sodium phosphate.
180
What are the causes of **hyperphosphatemia**?
* Increased intestinal absorption
* Decreased renal excretion
* Transcellular shifts
## Footnote
Common causes include vitamin D toxicosis, renal failure, and tumor lysis syndrome.
181
What is the treatment for **hyperphosphatemia**?
* Address underlying problems
* Volume expansion with non-phosphorus fluids
* Glucose administration
* Oral phosphate binders
## Footnote
Treatment aims to manage the underlying cause and reduce phosphorus levels.
182
What is **hypochloremia**?
A condition defined as corrected serum chloride values less than 107 mEq/L in dogs and less than 117 mEq/L in cats
## Footnote
It is associated with metabolic alkalosis.
183
What are the causes of **corrected hypochloremia**?
* Gastrointestinal loss
* Renal loss
* Excessive gain of sodium relative to chloride
## Footnote
Conditions like vomiting, diuretic use, and sodium bicarbonate administration can lead to hypochloremia.
184
What is **hyperchloremia**?
A condition defined as corrected chloride values higher than 113 mEq/L in dogs and higher than 123 mEq/L in cats
## Footnote
It is associated with metabolic acidosis.
185
What are the causes of **corrected hyperchloremia**?
* Excessive loss of sodium relative to chloride
* Excessive gain of chloride relative to sodium
* Renal chloride retention
## Footnote
Causes include diarrhea, fluid therapy, and renal failure.
186
What is the primary role of **chloride** in the body?
It is the primary extracellular anion and plays a role in metabolic acid-base disorders
## Footnote
Chloride has a reciprocal relationship with bicarbonate.
187
What is the significance of **glucose** in the body?
It is the primary product of carbohydrate digestion and the main energy substrate for the brain
## Footnote
Brain cells can use glucose without insulin, unlike other cells.
188
What is **hypoglycemia**?
A condition defined as a blood glucose level less than 60 mg/dL
## Footnote
Clinical signs include mental depression, seizures, and coma.
189
What are the causes of **hypoglycemia**?
* Decreased glucose intake
* Decreased glucose production
* Endocrine abnormalities affecting glucose regulation
## Footnote
Common causes include insulinoma, hepatic failure, and sepsis.
190
What is the role of the **liver** in glucose regulation?
* Converts glycogen into glucose via glycogenolysis
* Forms glucose from lactate and amino acids via gluconeogenesis
## Footnote
The liver provides glucose during fasting and plays a critical role in maintaining blood glucose levels.
