**Sunday January 13, 2008**

Back to basics !! - trivia on sunday

Though various scales and calculators are now available online and handy at bedside, but being an intensivist its important to atleast remember few basic formulae. Judge yourself. Ask yourself out of following 5 basic formulae, which one you can recall right.

1. Body Surface Area

2. Systemic Vascular Resistance

3. A-a Gradient

4. Static Compliance

5. Creatinine Clearence

Answers:

Back to basics !! - trivia on sunday

Though various scales and calculators are now available online and handy at bedside, but being an intensivist its important to atleast remember few basic formulae. Judge yourself. Ask yourself out of following 5 basic formulae, which one you can recall right.

1. Body Surface Area

2. Systemic Vascular Resistance

3. A-a Gradient

4. Static Compliance

5. Creatinine Clearence

Answers:

**1. BSA = Sqrt of [Wt (kgs) x Ht (cms)/3600]**

**2. SVR = [(MAP -CVP)/CO] 80 dynes/sec x cm-5**

*Normal: 900-1200 dynes/sec x cm-5*

**Normal is less than 10 torr**

3. A-a Gradient = [(FiO2 /100) (760 - 47)] - (PaCO2 /0.8) - PaO2

3. A-a Gradient = [(FiO2 /100) (760 - 47)] - (PaCO2 /0.8) - PaO2

**4. Static Compliance = VT/Pplateau - PEEP**

*Normal >60 mL/cm H2O*

**5. Creatinine Clearence = 140-Age x Weight (Kg)/ 72 xSerum creatinine ( x 0.85 for feamles)**

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