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USMLE Step 2 CK Forum USMLE Step 2 CK Discussion Forum: Let's talk about anything related to USMLE Step 2 CK exam


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  #1  
Old 09-07-2013
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Smile 5 Daily Notes

I thought that I would start a thread where I write down 5 notes a day, form the topics that I read that day.

Exam date: Dec, 31 2013 (yes, I want to enjoy new years eve)

There wont be much about IM because I started this thread after finishing most it... However Pulmonary, Emergency Medicine, Neurology, Dermatology, Ophthalmology & Radiology will be included...

If you know answers to any of the questions, I would be glad to hear for you.
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  #2  
Old 09-07-2013
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5 Daily Notes
  • Asthma is high yeild, make sure you know everything about it
  • Steroids decrease mortality in Sterp. pneumonia meningitis, although it is now given in all cases of meningitis
  • Steroids also decrease mortality in severe PCP penumonia
  • Important medications that cause seizures: Imipenim, Desipramine, Bupropion.... any other important ones?
  • Pneumococcal and H. Influenza vaccine is given to HIV+ patients regardless of CD4 count
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  #3  
Old 09-09-2013
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5 Notes:
  • 3 more infections where steroids decrease mortality: TB pericarditis, TB meningitis & Acute exacerbation of COPD (technically not an infection but most acute exacerbations are caused by infections)
  • What is the most accurate test for Cystic Fibrosis? MTB says Cl- sweat test, but I remember Uworld for step 1 says Transnasal Potential Difference can diagnose those with partial mutations.....
  • Low Na+ can occur in pneumonia as a result of SIADH, most common in Legionella
  • Silicosis occurs in upper lung fields distorting TB CXR so PPD is done yearly
  • Lymph Node biopsy is most accurate test in Sarcoidosis, follow ACE levels for efficacy of treatment and prognosis
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Old 09-11-2013
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5 Notes
  • Why is there a normal Po2 in Methemoglobinemia, oxidized hemoglobin can't carry o2
  • Bicarbonate is used in TCA overdose to prevent arrhythmia
  • VF & pulse-less VTach are the only arrhythmias that get un-synchronized cardioversion
  • Defibrillation is more important than endotracheal intubation while giving basic life support
  • MCC of death in hypothermia is arrhythmia (VTach)
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  #5  
Old 09-19-2013
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Quote:
Originally Posted by kid_next_door View Post
5 Notes
  • Why is there a normal Po2 in Methemoglobinemia, oxidized hemoglobin can't carry o2
  • Bicarbonate is used in TCA overdose to prevent arrhythmia
  • VF & pulse-less VTach are the only arrhythmias that get un-synchronized cardioversion
  • Defibrillation is more important than endotracheal intubation while giving basic life support
  • MCC of death in hypothermia is arrhythmia (VTach)

To answer your question about why there is normal Pao2 in Methaemoglobinaemia. To understand this it is important to explain the difference between 2 key concepts---- Pao2 measures the the pressure of oxygen DISSOLVED IN PLASMA while Oxygen saturation is the actual measure of oxygen which is carried by the heamoglobin in the red blood cells.
We breathe in Oxygen in room air which gets into the lungs which has to be dissolved in plasma first(PaO2) before the RBCs then take it up(O2 sats).
If you understand the above, then u can see why Methaemoglobinaemia will have a normal PaO2 and a reduced O2 sats. It has nothing to do with the oxygen dissolved with the plasma and everything to do with Hb which is oxidised so it has a low affinity for O2.

Does this make any sense?
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  #6  
Old 09-19-2013
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Quote:
Originally Posted by Nino View Post
To answer your question about why there is normal Pao2 in Methaemoglobinaemia. To understand this it is important to explain the difference between 2 key concepts---- Pao2 measures the the pressure of oxygen DISSOLVED IN PLASMA while Oxygen saturation is the actual measure of oxygen which is carried by the heamoglobin in the red blood cells.
We breathe in Oxygen in room air which gets into the lungs which has to be dissolved in plasma first(PaO2) before the RBCs then take it up(O2 sats).
If you understand the above, then u can see why Methaemoglobinaemia will have a normal PaO2 and a reduced O2 sats. It has nothing to do with the oxygen dissolved with the plasma and everything to do with Hb which is oxidised so it has a low affinity for O2.

Does this make any sense?
yes makes sense now, thank you
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Old 09-19-2013
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Quote:
Originally Posted by kid_next_door View Post
I thought that I would start a thread where I write down 5 notes a day, form the topics that I read that day.

Exam date: Dec, 31 2013 (yes, I want to enjoy new years eve)

There wont be much about IM because I started this thread after finishing most it... However Pulmonary, Emergency Medicine, Neurology, Dermatology, Ophthalmology & Radiology will be included...

If you know answers to any of the questions, I would be glad to hear for you.
This is great work. Keep on.
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Old 09-19-2013
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thats great idea!
please keep going...
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  #9  
Old 09-20-2013
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Quote:
Originally Posted by ag2011n View Post
This is great work. Keep on.
Quote:
Originally Posted by aj23 View Post
thats great idea!
please keep going...
I am continuing this thread here:

Step 2CK Preparation Journal
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