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Monday, April 27, 2009

Day #292 - Meningoencephalitis


Today we discussed a few issues:

  1. The developing influenza outbreak (see previous blogs on influenza). A review of the neurologic manifestations of influenza infection is available here.
  2. A case of meningoencephalitis (see TWH blog), presumably due to mumps (though I have my reservations as the parotid enlargement classically predates the encephalitis and the IgM is still pending!)
  3. TB Meningitis was discussed given the epidemiology.

Friday, April 24, 2009

Day #289 - Hypernatremia

Today we talked about a patient with decreased level of consciousness from hypernatremia.

This a great review of the topic.

The key in management is to provide free water at a rate that allows the serum sodium to decrease 10mmol/L/24h. This is usually accomplished after treating any severe ECF volume contraction with normal saline.

Wednesday, April 22, 2009

Day #287 - Massive Splenomegaly

Today we heard about a patient with massive splenomegaly who presented with symptoms anorexia and weight loss.

We discussed the physical diagnosis of splenomegaly. We also talked about differentiating the spleen from an enlarged kidney or stomach based.

Spleen
  • Has notch
  • Cannot palpate above
  • Descends with inspiration
  • Cannot ballot
  • Splenic rub


Kidney
  • No notch
  • Can ballot
  • May be able to palpate above
  • No change with inspiration
Stomach
  • No notch
  • Cannot ballot
  • Can not palpate above
  • Succession splash
We then discussed the differential diagnosis for massive splenomegaly (8cm below costal margin or greater than 1kg) which includes:
Remember, the spleen can be enlarged by three mechanisms:
  1. Hypertrophy or hyperplasia related to increased splenic function (i.e. thalasemia, infection, autoimmune disease)
  2. Congestion due to portal hypertension
  3. Infiltration (i.e. lymphomas, leukemias, extramedulary haematopoesis, amyloid)
We finally ended up talking about making the diagnosis in this case, which is likely lymphoma.

Wednesday, April 15, 2009

Day #280 - Anion Gap Metabolic Acidosis in an Alcoholic

Today was great!
We talked about the approach to acute confusion.
Then we talked about alcohol withdrawl and the treatment thereof. An approach that seems "easy" to remember is to use CIWA-A hourly giving 15mg for CIWA-A 8 to 15 and 30mg for scores above 15. Diazepam or lorazepam can be substituted. Disorientation and hallucinosis can be treated with small doses of haloperidol (i.e. 2.5-5mg)
Then we talked about the differential diagnosis of anion gap metabolic acidosis and the fact that the osmolar gap can sometimes be normal in toxic alcohol poisoning.
Then we talked about the management of HONK/DKA.

Tuesday, April 14, 2009

Day #279 - Cirrhosis and Possible Myxedema Coma


The patient (not the man in the picture!!) today had alcohol induced cirrhosis -- cirrhosis, its complications, and treatment thereof previously blogged (here, here, and here) with hepatic encephalopathy, massive ascites, and jaundice and possible hepatorenal syndrome.

We also later learned that the patient initially underreported their alcohol consumption. I couldn't find any literature on this in patients with cirrhosis; however, in my experience this is common.

The red-herring in this case was the anorexia and hoarse voice with cough which was supicious for malignancy -- however, we later found out that the patient was also severly hypothyroid which may have explained the hoarse voice -- and the anorexia could be explained by the severe liver disease.

The mental status may have also been depressed due to superimposed myxedema coma and it was important to recognize this.