Podcast
Questions and Answers
What is a major determinant of Pulmonary Vascular Resistance (PVR)?
What is a major determinant of Pulmonary Vascular Resistance (PVR)?
- Heart rate
- Blood flow rate
- Transmural pressure difference (correct)
- Systemic blood pressure
What allows for less resistance to flow in the pulmonary circulation compared to systemic circulation?
What allows for less resistance to flow in the pulmonary circulation compared to systemic circulation?
- Heart rate
- Vessel diameter
- Transmural pressure difference (correct)
- Blood viscosity
What type of pressure drop is observed in the pulmonary circulation from the pulmonary artery to the left atrium?
What type of pressure drop is observed in the pulmonary circulation from the pulmonary artery to the left atrium?
- ~ 100 mmHg
- ~ 150 mmHg
- ~ 50 mmHg
- ~ 10 mmHg (correct)
What plays a major role in determining Pulmonary Vascular Resistance (PVR) besides active smooth muscle contraction?
What plays a major role in determining Pulmonary Vascular Resistance (PVR) besides active smooth muscle contraction?
How does Pulmonary Vascular Resistance (PVR) compare to Systemic Vascular Resistance (SVR)?
How does Pulmonary Vascular Resistance (PVR) compare to Systemic Vascular Resistance (SVR)?
In which zone of the lung does capillary pressure never exceed alveolar pressure?
In which zone of the lung does capillary pressure never exceed alveolar pressure?
What characterizes Zone 2 of the lung in terms of blood flow?
What characterizes Zone 2 of the lung in terms of blood flow?
How is pulmonary capillary wedge pressure (PCWP) estimated?
How is pulmonary capillary wedge pressure (PCWP) estimated?
What does a Swan-Ganz catheter balloon tip floated into the pulmonary artery estimate?
What does a Swan-Ganz catheter balloon tip floated into the pulmonary artery estimate?
During exercise, which lung zone experiences continuous blood flow?
During exercise, which lung zone experiences continuous blood flow?
What is the primary function of pulmonary circulation?
What is the primary function of pulmonary circulation?
How many pulmonary capillaries supply the alveoli in the lungs?
How many pulmonary capillaries supply the alveoli in the lungs?
Where do lung structures distal to terminal bronchioles receive oxygen from?
Where do lung structures distal to terminal bronchioles receive oxygen from?
What is the average diameter of pulmonary capillaries?
What is the average diameter of pulmonary capillaries?
In the absence of pulmonary circulation, what can serve as collateral circulation for gas exchange in the airways?
In the absence of pulmonary circulation, what can serve as collateral circulation for gas exchange in the airways?
What is the purpose of Hypoxic Pulmonary Vasoconstriction (HPV)?
What is the purpose of Hypoxic Pulmonary Vasoconstriction (HPV)?
What happens when the PO2 of alveoli decreases in the context of Hypoxic Pulmonary Vasoconstriction?
What happens when the PO2 of alveoli decreases in the context of Hypoxic Pulmonary Vasoconstriction?
What does Hypoxic Pulmonary Vasoconstriction aim to mitigate?
What does Hypoxic Pulmonary Vasoconstriction aim to mitigate?
How does Hypoxic Pulmonary Vasoconstriction affect the resistance to blood flow in hypoventilated alveoli?
How does Hypoxic Pulmonary Vasoconstriction affect the resistance to blood flow in hypoventilated alveoli?
What is the volume and distributive aspect of pulmonary circulation when lying down?
What is the volume and distributive aspect of pulmonary circulation when lying down?
What is the term for the phenomenon where blood flow is directed away from poorly ventilated areas of the lung to well-ventilated regions?
What is the term for the phenomenon where blood flow is directed away from poorly ventilated areas of the lung to well-ventilated regions?
In pulmonary circulation, what is the main determinant of arterial pressure?
In pulmonary circulation, what is the main determinant of arterial pressure?
How does increased cardiac output affect pulmonary vessels?
How does increased cardiac output affect pulmonary vessels?
What is the term for the condition where fluid accumulates in the lungs impairing gas exchange?
What is the term for the condition where fluid accumulates in the lungs impairing gas exchange?
How does the position of vessels in the lung affect their resistance?
How does the position of vessels in the lung affect their resistance?
What happens to the alveolar capillary walls when blood volume inside increases?
What happens to the alveolar capillary walls when blood volume inside increases?
At high lung volumes, which of the following statements is true regarding pulmonary vascular resistance?
At high lung volumes, which of the following statements is true regarding pulmonary vascular resistance?
What happens to pulmonary vascular resistance with increased cardiac output?
What happens to pulmonary vascular resistance with increased cardiac output?
How does recruitment affect pulmonary vascular resistance?
How does recruitment affect pulmonary vascular resistance?
During exercise, what contributes to the decrease in pulmonary vascular resistance?
During exercise, what contributes to the decrease in pulmonary vascular resistance?
How does positive pressure ventilation (PPV) affect pulmonary blood flow?
How does positive pressure ventilation (PPV) affect pulmonary blood flow?
What is the main effect of PPV on the afterload of the right ventricle?
What is the main effect of PPV on the afterload of the right ventricle?
Which condition is likely to be associated with an increase in Zone 1 in the lungs?
Which condition is likely to be associated with an increase in Zone 1 in the lungs?
What effect does positive pressure ventilation, especially with PEEP, have on low ventilation-perfusion ratios (shunt)?
What effect does positive pressure ventilation, especially with PEEP, have on low ventilation-perfusion ratios (shunt)?
How does a decrease in blood volume to the left heart impact left ventricular filling and stroke volume?
How does a decrease in blood volume to the left heart impact left ventricular filling and stroke volume?
What happens to intrathoracic pressure during positive pressure ventilation?
What happens to intrathoracic pressure during positive pressure ventilation?
How does resistance to pulmonary blood vessels change during inspiration?
How does resistance to pulmonary blood vessels change during inspiration?
What is the effect of negative-pressure (eupnea) breathing on LV filling and stroke volume?
What is the effect of negative-pressure (eupnea) breathing on LV filling and stroke volume?
How does decreased CO affect total thoracic blood volume?
How does decreased CO affect total thoracic blood volume?
What is the impact of decreased RV filling & SV on RVCO?
What is the impact of decreased RV filling & SV on RVCO?
