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Final basic sciences short case 3

Created: 7/4/2004

Answer the following questions on one-lung ventilation (OLV):

– What are the indications for OLV?

– What are the physiological mechanisms/causes of hypoxaemia with intrathoracic surgery?

– How should hypoxaemia on OLV be treated?

– How would you apply continuous positive airway pressure (CPAP) to the non-dependent lung?

– How could the surgeon assist in applying CPAP?

Answer the following questions on electricity:

– What is Ohm’s law?

– What is the difference between direct (DC) and alternating current (AC)?

– Draw a diagram demonstrating the differences between AC and DC.

– Does Ohm’s law apply to AC or DC?

– Is the mains supply AC or DC?

– What is mains current frequency?

– Is the mains current frequency safe?

– If the answer to the previous question is “no”, why is it used?

– Discuss the problem of leakage current. By what mechanisms might a patient suffer?


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