Acquired Metabolic Disorders Flashcards

1
Q

Serum osmalality formula

A

OSM=2 x Na + glucose/18 + BUN/3

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2
Q

When the CBF falls below 60-70mmHg, this form of additional compensation allows normal energy metabolism to continue.

A

Increased oxygen extraction

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3
Q

“No-reflow” phenomenon

A

Swelling of the endothelium and blockage of circulation to the ischemic cerebral tissues causing irreversibility of ischemic lesions

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4
Q

Most common early change in severe anoxic-ischemic injury

A

Loss of distinction between the cerebral gray and white matter

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5
Q

Clinical signs at 1 day after cardiac arrest that predict a poor neurologic outcome

A
  1. Absent corneal response
  2. Absent pupillary reactivity
  3. Absence of withdrawal to pain
  4. Absence of any motor response

@72H, absence of motor response is an addtl poor prog sign

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6
Q

Drug of choice for polymyoclonus

A

Clonazepam 8-12mg daily

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7
Q

At what level of carboxyhemoglobin do coma, decerebrate or decorticate posturing, seizures and slowing of EEG rhythms seen?

A

At 50-60% of total hemoglobin

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8
Q

Early symptoms of CO poisoning

A

Headache, nausea, dyspnea, confusion, dizziness and clumsiness

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9
Q

Delayed neurologic deterioration from CO poisoning occurs at least how long after exposure?

A

1-3weeks

Usu extrapyramidal features

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10
Q

Characteristic imaging finding in CO poisoning

Or in other forms of anoxia

A

Discrete areas of decreased attenuation in the B globus pallidus, sometimes inner putamen

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11
Q

2 Common features among patients who developed delayed extrapyramidal symptoms

A
  1. Prolonged period of pure anoxia

2. Basal ganglia lesions on CT

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12
Q

When to intiate hyperbaric oxygen for CO poisoning on top of inspired oxygen?

A

Carboxyhemoglobin >40%
OR
(+) coma or seizures

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13
Q

Main features of Chronic mountain sickness or Monge disease

A

Pulmonary hypertension
Cor pulmonale
Secondary polycythemia

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14
Q

Most effective preventive measure to counteract mountain sickness

A

Acclimatization by 2-4-day stay at intermediate altitudes

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15
Q

Glucose level which manifests as a confusional state and seizures? Which causes coma and irreparable brain injury?

A

30mg/dL

10mg/dL - coma and irreparable brain injury

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16
Q

Glucose reserve of the brain

How long is this able to sustain cerebral activity?

A

1-2g (30 mmol/100g tissue)
Used at a rate of 60-80 mg/min
Sustains activity for 30min or less

17
Q

Combined use of corticosteroids and this AED, esp in elderly patients with brain tumors, can precipit Hyperosmolar nonketotic hyperglycemia

A

Phenytoin - as it inhibits insulin release

18
Q

Usual concentrations of NH3 in arterial blood seen in hepatic/ portal-systemic Encephalopathy?

A

In excess of 200 mg/dL

19
Q

Neuropathologic changes in hepatic coma

A

Diffuse inc in size and number of protoplasmic astrocytes in the deep layers of correx, lenticular nuclei, thalamo, Substantia nigra, cerebellar cortex red, dentate and pontine nuclei

Alzheimer Type II astrocytes

20
Q

Pathologic findings in Reye Syndrome

A

Cerebral edema often with Cerebellar herniation

Infiltration of hepatocytes with fine droplets of fat

21
Q

Oral administration of this drug in hepatic Encephalopathy suppresses the urease-producing organisms in the bowel but may cause renal damage and ototoxicity. Hence it was replaced with Rifaximin.

A

Neomycin

22
Q

Neuropathologic changes in Dialysis Encephalopathy

A

Mild degree of microcavitation of the superficial layers of the cerebral cortex (more severe in the L frontotemporal operculum than the rest of the cortex)

23
Q

Fluid restriction in SIADH

A

Na <120meq/L - 500mL/24hrs

Na <130meq/L - 1000mL/24hrs

24
Q

To prevent central pontine myelinolysis from overly rapid Na correction, the rate should be:

A

Nk more than 10 mmol/L in the first 24hrs

25
Q

Fundamental abnormality in osmotic demyelination

A

Destruction of myelinated sheaths throughout the lesion, with relative sparing of axons and intactness of nerve cells of pontine nuclei
Oligodendrocytes depleted
Signs of inflam absent

26
Q

Pathology of acquired hepatocerebral degeneration

A

Irregular line of necrosis or gliosis throughout both hemispheres and the lenticular nuclei may be shrunken and discolored.
Resemble hypoxic ones but spares hippocampus, globus pallidus, and deep folia of cerebellar cortex.

Widespread hyperplasia of protoplasmic astrocytes
Necrotic zones where myelinated fibers and nerve are destroyed

Opalski cells - nerve cells swollen and chromatolyzed like in Wilson

27
Q

Sprue is associated with which HLA genotypes in 90% of cases?

A

HLA DQ2

HLA DQ8

28
Q

Dose of prednisone at which 10-15% of patients show symptoms o corticosteroid psychoses

A

60-100 mg/day

29
Q

Antibodies against gluten seen among patients with and without clinical enteropathy of celiac disease that correspond to the presence of neurologic manifestations.

A

antigliadin antibodies

30
Q

Two forms of endemic cretinism and their manifestations

A

Neurologic cretinism

  • deaf-mutism, dysarthria, proximal limb and truncal rigid-spastic motor disorder mainly LE
  • mental deficiency
  • lack of iodine 2nd-3rd trim so need to provide iodine inbefore and during 1st trim

Myxedematous

  • short stature, microcephaly, coarse facial features, retarded psychomotor devt
  • lack of thyroid hormone in the late second and third trimesters