Acquired Metabolic Disorders Flashcards
Serum osmalality formula
OSM=2 x Na + glucose/18 + BUN/3
When the CBF falls below 60-70mmHg, this form of additional compensation allows normal energy metabolism to continue.
Increased oxygen extraction
“No-reflow” phenomenon
Swelling of the endothelium and blockage of circulation to the ischemic cerebral tissues causing irreversibility of ischemic lesions
Most common early change in severe anoxic-ischemic injury
Loss of distinction between the cerebral gray and white matter
Clinical signs at 1 day after cardiac arrest that predict a poor neurologic outcome
- Absent corneal response
- Absent pupillary reactivity
- Absence of withdrawal to pain
- Absence of any motor response
@72H, absence of motor response is an addtl poor prog sign
Drug of choice for polymyoclonus
Clonazepam 8-12mg daily
At what level of carboxyhemoglobin do coma, decerebrate or decorticate posturing, seizures and slowing of EEG rhythms seen?
At 50-60% of total hemoglobin
Early symptoms of CO poisoning
Headache, nausea, dyspnea, confusion, dizziness and clumsiness
Delayed neurologic deterioration from CO poisoning occurs at least how long after exposure?
1-3weeks
Usu extrapyramidal features
Characteristic imaging finding in CO poisoning
Or in other forms of anoxia
Discrete areas of decreased attenuation in the B globus pallidus, sometimes inner putamen
2 Common features among patients who developed delayed extrapyramidal symptoms
- Prolonged period of pure anoxia
2. Basal ganglia lesions on CT
When to intiate hyperbaric oxygen for CO poisoning on top of inspired oxygen?
Carboxyhemoglobin >40%
OR
(+) coma or seizures
Main features of Chronic mountain sickness or Monge disease
Pulmonary hypertension
Cor pulmonale
Secondary polycythemia
Most effective preventive measure to counteract mountain sickness
Acclimatization by 2-4-day stay at intermediate altitudes
Glucose level which manifests as a confusional state and seizures? Which causes coma and irreparable brain injury?
30mg/dL
10mg/dL - coma and irreparable brain injury