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  1. USMLE Step 1 Forum
    Whats the problem associated with the following panel: pH: 7.33 HCO3: 13 pCO2: 28 Explain your answer.
  2. USMLE Step 1 Forum
    Self-made question, watch out for mistakes (they are possible) ======================================= A 40-old car-sales manager was working hard the previous year and now presents with the following symptoms: he has poor coordination of hands, speech and eye movements. You notice poor overall...
  3. USMLE Step 1 Forum
    What is the mechanism of sodium escape in primary hyperaldosteronism?
  4. USMLE Step 1 Forum
    Carboxyhemoglobin is a form of Hb that is bound to CO instead of o2, right? Then why does it cause a left shift in the dissociation curve?! In other words, could someone plz explain the whole carboxyhemoglobin thing :S Thnx in advance!
  5. USMLE Step 1 Forum
    Hello all, I had a question regarding renal blood flow (RBF). In BRS physiology it mentions that there is autoregulation of RBF, accomplished through changing renal vascular resistance. It says that RBF can remain constant over arterial pressures of 80 to 200 mm HG, and it is done through...
  6. USMLE Step 1 Forum
    let's say you have fibroids, and therefore bleeding, what will be the changes to O2 content, O2 saturation and arterial PO2? These kinds of questions have troubled me for months so please explain your answer. Some things change and some stay normal, but I've never understood why. Thanks in...
  7. USMLE Step 1 Forum
    Between Epi and NE, is one more selective for the medulla?
  8. USMLE Step 2 CK Forum
    USMLE World Says: Cant get it...anyone?
  9. USMLE Step 1 Forum
    I have read this short explanation in medEssentials in online Kaplan Qbank NB: page 235 in 2nd Edition page 249 in 3rd Edition. -If low capillary velocity allows adequate time for diffusion, exchange is perfusion limited. -If velocity is high, metabolic exchange may become diffusion...
  10. USMLE Step 1 Forum
    Why is there respiratory alkalosis in Restrictive lung disease? is it due to hypoxemia-->stimulation of peripheral receptors-->hyperventilation?
  11. USMLE Step 1 Forum
    dear fellows, i always feel embarrassing upon graph analysis questions in physiology, it always take me like 2mins to figure out what being asked and direct myself to the answer... would you guys give me any recommendations/website/previous threads to strengthen this field? thanks a lot
  12. USMLE Step 1 Forum
    Hello everyone, I'm preparing for USMLE step 1 early in the subject that I'm not doing quite well. I'm now using BRS physiology for the review and it seems like I need more comprehensive physiology problems to polish my knowledge, so any recommended books? :)
  13. USMLE Step 1 Forum
    Why do the A Bands remain the same in muscle contraction? If the distance between the Z lines is decreasing, shouldn't the amount of overlap between actin and myosin increase? I'm completely lost. Any help would be appreciated.
  14. USMLE Step 1 Forum
    Why doesnt giving 100% oxygen improve PO2 in shunts/airway obstruction? its not like both lungs are collapsed or airways of both the lungs get obstructed!?
  15. USMLE Step 1 Forum
    i also read estrogen stimulate synthesis of factor VIII there fore thrombosis but post menopausal women are in risk of cardiovascular disease due to low estrogen,,can some explain please?
  16. USMLE Step 1 Forum
    how does % iron saturation changes in anemia of chronic disease ? Goljan rr-decrease FA 2010-no change Which one is more credible ? --- I am here:
  17. USMLE Step 1 Forum
    what is the pulse pressure in a patient with a systolic BP of 150 and a MAP of 90?
  18. USMLE Step 1 Forum
    what is the cause of high urine osmolarity in pre-renal failure? main determinant of urine osmolarity is sodium, it is less in prerenal failure...:confused::confused:
  19. USMLE Step 1 Forum
    How come a FVC 85% of predicted and a FEV1/FVC ratios = 86% can be consider a normal pulmonary function test??? This is part of UW explanation.... Q ID 824... it is mentioned that this patient with this values has normal pulmonary function tests? am I missing something here??? I believe that...
  20. USMLE Step 1 Forum
    Lot of books say that we need to put a catheter in patients of DKA, if no urinne has passed in the last 3 hours. can anyone plz explain me why that needs to be done?