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  1. USMLE Step 2 CK Forum
    as i know the dependent part of the lung get the greatest perfusion and ventilation , then why in massive haemoptysis we keep the patient lying on the side of the bleeding lung , it will get more perfusion which means more bleeding and also more ventilation which on other side will decrease...
  2. USMLE Step 1 Forum
    pt. with small cell lung ca refuses treatment. after sometime P.E. shows widened angle b/w the left & rt. main stem bronchus with rt. bronchus more horizontal. which of the foll. xplains this? Dilated right atrial appendage Enlarged subcarinal lymph node Malignant pericardial effusion Volume...
  3. USMLE Step 1 Forum
    Guys any help here? FA says trachea deviates to Same side of pathology in spontaneous pneumothorax whilst it deviates to opposite side in tension pneumothorax why? I am thinking in spontaneous pneumothorax the lungs collapse at the affected side right? and ofcourse in tension pnuemothorax the...
  4. USMLE Step 1 Forum
    So I'm having a bit of trouble piecing together the relationship between surfactant, surface area, and lung expansion. According to Costanzo: "During inflation of the lung (inspiration limb), surfactant, which is newly produced by type II alveolar cells, enters the liquid layer lining the...
  5. USMLE Step 1 Forum
    Hello ! I quote from Kaplan : " The following changes occur with development of simple pneumothorax : - IPP increases from -5 to equal atm. pressure - Lung recoil decreases to zero as the lung collapses - Chest wall expands. At FRC, the chest wall is under slight tension directed outward. It is...
  6. USMLE Step 1 Forum
    Can someone explain the differences between typical and atypical pneumonia??
  7. USMLE Step 1 Forum
    while saline in lung increases compliance,, by decreasing air water interface,, why hemorrhage decreases compliance? Happy-2
  8. USMLE Step 1 Forum
    Hey People! I don't understand why my answer is incorrect can someone please explain in normal terms why the correct answer is correct?:rolleyes: A 10 year old boy is admitted to the hospital because of a full-thickness burn over 40% of his body surface area. Three days later he develops...
  9. USMLE Step 1 Forum
    ARDS and RDS both have clinical symptom of TACHYPNEA so it means both of them cuz respiratory Alkalosis???
  10. USMLE Step 1 Forum
    Patient develops hypoxemia 35 minutes after ingesting a lethal dose of barbituates. What is the patients abg look like? PO2; PCO2; A-a 40; 50; 35 40; 60; 40 50; 25; 10 50; 80; 10 60; 35; 25 I got the question wrong. Was hoping somebody could help me work this problem out.
  11. USMLE Step 1 Forum
    Why there's normal or decrease pco2 and respiratory alkalosis in emphysma?? I mean since it's an OBSTRUCTIVE disease i thought there should be CO2 retention and thus respiratory acidosis, not alkalosis. Please help!
  12. USMLE Step 1 Forum
    As per First Aid during exercise there is no change in PaO2 and PaCO2 but there is an increase in venous CO2 content. PaO2 no change: because we increase ventilation breathing in more O2 PaCO2 no change: because when we are breathing hard we are blowing off CO2 Increase in venous CO2 content...
  13. USMLE Step 1 Forum
    In "restrictive" lung Dz Why the "expiratory flow rate" increase due to decrease "lung compliance". I mean what's the relationship btw compliance and expiratory flow. Thank u guys
  14. USMLE Step 1 Forum
    Can anyone explain why chronic bronchitis=blue bloater and emphysema=pink puffers? Why is that so? I thought both will have low oxygen and why emphysema is still pink and not blue? :rolleyes::rolleyes:
  15. USMLE Step 1 Forum
    This is not from a USMLE text book - I took it from another diagnosis test. A baby was autopsied to find out if the baby was born dead or alive. Which of the following results prove that the baby was born dead and not alive? 1. dissected lung(s) sinks in water 2. dissected lung(s) floats in...
  16. USMLE Step 1 Forum
    An 80-year-old woman dies shortly after admission to the hospital because of a 3-day history of progressively increasing shortness of breath. She had a history of heart failure. Examination of the lungs during autopsy shows alveolar damage with distended lymphatics, congested alveolar...
  17. USMLE Step 1 Forum
    A 25-year-old man comes to the emergency department because of a productive cough, fever, night sweats, shortness of breath, malaise, weight loss, and poor appetite that have progressively worsened over the past 3 weeks. He has worked in construction in the USA since emigrating from Thailand 1...
  18. USMLE Step 1 Forum
    What is the test of choice in PE? FA errata page 510 says its helical CT ( in the errata they crossed out CT angio and put helical CT ) UWorls says the gold standard is pulmonary angiography..
  19. USMLE Step 1 Forum
    Hello.. "Supplementary O2 must be cautious in patient with COPD because hypoxia drives their respiratory function (where in normal undivisual, the pCO2 medicates the resp. drive) UW" Can anyone help me to understand this: How does hypoxia drive their resp. function in patient with COPD ? Thanks,
  20. USMLE Step 1 Forum
    Can sum1 explain: What will be the compliance of lungs if they are inflated with saline fluid? :cool: