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Neonatalogy > Sepsis In Foals > Flashcards

Sepsis In Foals Flashcards

1
Q

SIRS systemic inflammatory response syndrome refers to

A

A systemic response that results in 2 of the following: fever, tachcyardia, tachypnea or hyperventilation leukocytosis, luekopenia or relative increase in circulating neutrophils

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2
Q

Sepsis definition

A

When SIRS occurs in response to a suspected or confirmed infectious process

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3
Q

Infection with which class of bacterial organisms causes sepsis in neonatal foals?

A

Gram negative bacteria— release endotoxin

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4
Q

Foal GI tract is an important portal of entry for pathogens via which route of absorption?f

A

Pinocytosis of macromolecules in the small intestine (little discrimination between maternal IGG and macromolecules)

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5
Q

What is the predominant organism isolated from septic foals?

A

E coli

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6
Q

Rare, but what is the most common systemic fungal infection in foals?

A

Candida albicans

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7
Q

Common biochemical abnormalities in septic foals

A 
Abnormal blood glucose
Azotemia/hyperbilirubinemia
Acidemia
Hyperlactatemia
Arterial hypoxemia & hypercapnia (can occur indepedent to resp dz)
INC triglyceride concentration
Inc albumin
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8
Q

What is the gold standard for diagnosis of sepsis in a foal?

A

Blood culture

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9
Q

Examples of medical treatment options for systemic candidiasis

A

Fluconazole
Itraconazole
Miconazole
Amphtoericin B

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10
Q

Drugs that are antiendotoxic use to treat foals:

A

Flunixin meglumine
Polymyxin B
Pentoxifylline

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11
Q

When to consider vasopressor therapy in hypovolemic/septic shock/hypotensive patients?

A

After appropriate fluid resuscitation should consider vasopressors & inotropes

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12
Q

What is the incidence of pneumonia in septic foals?

A

28 to 50%

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13
Q

What percentage of foals that have diarrhea the bacteremic?

A

About 50% of neonates

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14
Q

How does uroperitoneum develop in foals?

A

Ischemia and Necrosis of bladder &/or urachus

Besides trauma

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15
Q

CSF of a foal with meningitis

A

Pleocytosis (normally neutrophilic)

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16
Q

Treatment of choice for meningitis in foals

A

3rd generation cephalosporin (ceotaxime)

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17
Q

Major differentials for the neurologic neonate?

A 
Meningitis
Neonatal encephalopathy (NE)
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18
Q

What are some strategies to prevent sepsis in foals?

A

Maintain a clean environment
Reduce potential b act load introduced during udder seeking
Ensure GI intake of colostrum
Confirm adequate transfer of passive immunity
Ensure appropriate umbilical care
Monitor foals closely and tx suspect foals quickly

19
Q

Differentials for seizures in foals

A 
Neonatal encephalopathy
Bacterial meningitis
Viral encephalitis
Benign juvenile epilsepsy
Lavender foal syndrome
Kernicterus
Hepatic failure
Congenital brain disease
Hydrocephalus, hydranecephaly
Head trauma
Hypoglycemia
Eectrolyte disorders (Hypocalciemia hyponatremia, hypernatremia)
Tetanus
Toxicities (ivermectin, moxidectin)
Glycogen storage disease IV
Hyperammonemia of Morgan foals
20
Q

What is the basis of neonatal encephalopathy pathogenesis?

A

Reduction in cerebral blood flo w& oxygen to tissues during:
—Antepartum: maternal hypotension, severe hypoxia, infection, placental insufficiency
—Perpartum: cord occlusion, premature placental separation, dystocia
—Postnatal: neonatal shock, repsiraotry or cardiac arrest

21
Q

After reversible hypoxic-ischemic brain injury, neuronal injury and or death occurs in what 2 phases:

A
  1. Primary or acute phase of injury

2. Delayed phase of cell death

22
Q

Primary or acute phase of injury in the pathophysiology of neonatal encephalopathy involves:

A

Dec cerebral blood flow—> dec O2 & glucose delivery to the brain
—> switch to anaerobic respiration
—>Dec ATP & phosphocreatine & INC lactic acid production
—> DEC ATP results in inability to maintain Ca/Na/K regulation through the Na/K pump
—> cell swelling/edema & depolarization of neurons—> precipitates the release of neurotransmitter glutamate

23
Q

What is the role of microglia in the phase of primary energy failure of pathogenesis in neonatal encephalopathy?

A

Microglia migrate to the area of necrosis & release further inflammatory mediators that can damage the CNS

24
Q

Neonatal encephalopathy:

Delayed neuronal cell death or secondary energy failure occurs in what time period?

A

6 to 48 hours after initial hypoxic ischemic injury

25
Q

Neonatal encephalopathy:
Delayed neuronal cell death/secondary energy failure is believed to be through/associated with what following mechanisms?

A 
Excitotoxicity
Accumulation of intracellular calcium & resultant activation of numerous enzymes & pathways
Reperfusion injury (oxidative stress)
Cytotoxic actions of activated microglia
Inflammation
Apoptosis
26
Q

Neonatal encephalopathy

What is the pathway of glutamate in the healthy individual?

A

Glutamate released from presynpatic nerve terminals when signaled by neuronal depolarization

Rapidly removed from synpatic cleft by glutamate ransporters in astroglia & converted to glutamine

Transported back into nerve terminal for reuse

27
Q

Neonatal encephalopathy

What impairs the glutamate transporters in astroglial cells in teh synpatic cleft?

A

Hypoxia or ischemia
Decreased glucose delivery to teh brain

—> RESULTS: increased glutamate concentrations & excessive calcium influx into neurons—> excitotoxicity—> cell apoptosis & necrosis

28
Q

Neonatal encephalopathy

Why is the neonatal brain susceptible to oxidative injury?

A

High concentrations of unsaturated fatty acids
High rate of oxygen consumption
Low concentration of antioxidants

29
Q

Neonatal encephalopathy:

Reactive oxygen spp (ROS) and reactive nitrogen spp (RNS) cause significant damage to what

A 
Biological proteins (membrane protein degration)
Lipids (lipid oxidation)
Nucleic acids (DNA degeneration)
30
Q

Neonatal encephalopathy:

What is a steroid that possibly contributes to neonatal encephalopathy in some foals?

A

Neurosteroids— ie plasma progestagens: progesterone, epitetestosterone, androstenedione

31
Q

What are recognized risk factors for the development Neonatal encephalopathy in foals?

A 
Dystocia
Induced parturition
Cesarean section
Placentitis
Premature placental separation
Severe illness
Post-term pregnancy (fescue toxicity)
Maternal hypotension (endotoxemia, hemorrhage, anemia, severe respiratory disease)

Other possible risk factors: meconium aspiration, twin foals, fetal infection, congenital malformations, umbilical cord accidants

32
Q

Reported clinical signs in neonatal foals & percentages (from a retrospective study)

A 
Abnormal udder seeking (59%)
Abnormal suckle (55%)
Inability to stand (42%)
Abnormal GI motility (37%)
Abnormal consciousness (34%)
Seizure activity (22%)
33
Q

Neonatal encephalopathy in human infants diagnosis is supported by what modalities?

A

Neurologic exam
MRI
EEG
Ultrasound

34
Q

Neonatal encephalopathy diagnosis in the foals is based on:

A 
Clinical impression
Historial information
Neurologic examination
Compatible clinical signs
Exclusion of other disease processes
35
Q

What is an alternative therapy to doxapram to improve PaCO2 in foals with NE?

A

Caffeine per os: loading dose of 7.5 to 12 mg/kg, followed by daily dose of 2.5 to 5 mg/kg if CRI is not feasible

36
Q

Neonatal encephalopathy treatment:

If hypoventilation and hypercapnia are observed what medication can be administered as a CRI as a respiratory stimulant?

A

Doxapram: at 0.02 to 0.05 mg/kg/hour

37
Q

For seizure control in foals, what medications can be used?

A

Diazepman: 0.1 to 0.2 mg/kg — given intermittently
Midazolam: 0.4 to 0.1 mg/kg IV or a CRI: 0.02 to 0.06 mg/kg/hour IV

Phenobarbital- for persistent seizure activity
—2 to 10 mg/kg IV over 15 minutes, then 5 mg/kg PO q12h

38
Q

What are possible side effects of phenobarbital?

A

Mild sedation
Ataxia
Hypothermia

39
Q

What medication can be administered if intractable cases of status epilepticus in foals?

A

Propofol CRI

40
Q

Proposed benefits of a hyperbaric chamber in NE foals?

A

Reduced apoptosis
Promotion of neuronal stem cell prolifeartion
Enhancement of oxygen radical scanvers
Increased oxygen delivery to teh brain
Increased activity of superoxide dismutase

41
Q

Medications used to combat edema and oxidative damage in foals with NE?

A

Mannitol: 0.5 to 2.0 g/kg as a 20% solution over 20 minutes IV q12-24 h
Furosemide: 1 mg/kg IV q12-24h
Dimethyl sulfoxide: 0.5 to 1 g/kg IV as a 10% solution over 30 minutes q12 to 24 hours

Thiamine: 5 to 10 mg/kg IV or sc q24h
Vitamin E: 20/kg IU/kg, sc or pO q24h
Vitamin C: 100 mg/kg/day IV

42
Q

What are the proposed benefits of magnesium sulfate in IV fluid therapy for NE foals?

A

Prevents calcium entry into the cell by nonceompetitive voltage depedent inhibition of NMDA receptors
— blocks release of glutamate & antagonizes the influx of calcium
— protective against hypoxic-ischemic injury

Dose: 0.5 g/kg/h for first hour, then 0.025 g/kg/h IV as CRI

43
Q

Reported survival rate in foals with NE (without complicating factors) is

A

70 to 80%

44
Q

Factors that decrease the prognosis for survival in foals with NE

A

Demonstrate C/S at tiem of birth
Evidence of brainstem or spinal cord involvement
Have multiple organs affected by hypoxic-ischemic injury
Have complicating factors (ie sepsis)
Remain comatose or difficult to arouse
Show no improvement in neurologic function in first 5 days
Have severe recurrent seizures

Neonatalogy (5 decks)

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