Fick's Law and Gas Diffusion
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Questions and Answers

Which of the following is the correct definition of dyspnoea?

  • A subjective perception of shortness of breath (correct)
  • A term combining the patient's subjective sensation of dyspnea with signs indicating difficulty breathing
  • Insufficient delivery of oxygen to the tissues
  • Deficiency of oxygen in arterial blood

Which of the following is NOT a cause of hypoxemia?

  • Hypoventilation
  • Diffusion impairment (correct)
  • Right to left shunt (intrapulmonary shunt)
  • Ventilation-perfusion (V/Q) mismatch

What is the normal range for PaCO2?

  • > 45mmHg
  • < 35mmHg
  • 35-45mmHg (correct)
  • 60-70mmHg

What are the effects of hypercapnia?

<p>All of the above (D)</p> Signup and view all the answers

What does a right shift on the Oxy-Hb curve indicate?

<p>Decreased O2 affinity to Hb at the alveolus (B)</p> Signup and view all the answers

What does PaO2 measure?

<p>The amount of dissolved oxygen in the blood (B)</p> Signup and view all the answers

Why is it important to assess accessory muscle use in a laboured breathing patient?

<p>To identify the specific muscles involved in laboured inhalation (D)</p> Signup and view all the answers

Which law describes the relationship between the concentration of a gas in a solution and its partial pressure?

<p>Fick's law (D)</p> Signup and view all the answers

What determines the rate of gas diffusion across a permeable membrane according to Fick's law?

<p>The partial pressure gradient of the gas (A)</p> Signup and view all the answers

What does the Bohr effect refer to?

<p>The affinity of haemoglobin for oxygen is reduced under conditions of low pH and high levels of carbon dioxide (C)</p> Signup and view all the answers

What does the O2-Hb dissociation curve illustrate?

<p>The affinity of haemoglobin for oxygen (C)</p> Signup and view all the answers

What does a left shift in the O2-Hb dissociation curve indicate?

<p>Increased affinity of haemoglobin for oxygen (D)</p> Signup and view all the answers

What does a right shift in the O2-Hb dissociation curve indicate?

<p>Decreased affinity of haemoglobin for oxygen (D)</p> Signup and view all the answers

What is the normal range of SaO2 for COPD patients?

<p>88-92% (C)</p> Signup and view all the answers

Which of the following is a characteristic of fine crackles?

<p>Short duration (D)</p> Signup and view all the answers

What is the normal range for arterial pH?

<p>7.35 to 7.45 (D)</p> Signup and view all the answers

Which of the following conditions is characterized by type 2 respiratory failure?

<p>Hypercapnia (A)</p> Signup and view all the answers

What is the normal range for arterial PaO2?

<blockquote> <p>75mmHg (D)</p> </blockquote> Signup and view all the answers

Which of the following is a characteristic of a pleural rub?

<p>Loud grating or rubbing sounds (D)</p> Signup and view all the answers

What is the normal range for arterial PaCO2?

<p>35 to 45mmHg (A)</p> Signup and view all the answers

Which of the following conditions is characterized by type 1 respiratory failure?

<p>Hypoxemia (B)</p> Signup and view all the answers

What is the normal range for arterial bicarbonate (HCO3-) levels?

<p>22 to 26 mmol (B)</p> Signup and view all the answers

What is the normal range for tidal volume aim in adults?

<p>5 to 10 ml/kg (A)</p> Signup and view all the answers

Which of the following is NOT a type of dead space?

<p>Physiological dead space (B)</p> Signup and view all the answers

What is the formula for minute ventilation?

<p>$V = RR \times TV$ (C)</p> Signup and view all the answers

Which of the following conditions is NOT a cause of respiratory alkalosis?

<p>Lung disease causing impaired gas exchange (A)</p> Signup and view all the answers

What is the equation for pulmonary compliance?

<p>$Pulmonary\ compliance = \frac{Volume},{Pressure}$ (D)</p> Signup and view all the answers

Which of the following is the correct equation for inspiratory capacity (IC)?

<p>$IC = Tidal\ volume + Inspiratory\ reserve\ volume$ (D)</p> Signup and view all the answers

What does a V/Q ratio less than 1 indicate?

<p>Intrapulmonary shunt (A)</p> Signup and view all the answers

What is the equation for functional residual capacity (FRC)?

<p>$FRC = Expiratory\ reserve\ volume + Residual\ volume$ (C)</p> Signup and view all the answers

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