MDRV2: Heart Lung Interactions

In patients with spontaneous ventilation, which effect increases venous return to the right atrium?

Increased right atrial pressure

Increased unstressed venous volume

Increased intrathoracic pressure

Increased mean systemic filling pressure

According to West’s lung zones, which statement is true?

In West zone 1, pulmonary vascular resistance increases due to collapse of extra-alveolar vessels

B. In West zone 2, pulmonary blood flow depends on the difference between pulmonary arterial and alveolar pressure

C. In West zone 3, pulmonary blood flow is lower than that in West zone 1 due to higher pulmonary alveolar pressure

D. In the area where the lung interstitial pressure is higher than alveolar pressure, pulmonary vascular resistance is elevated due to collapse of intra-alveolar vessels

Which statement is true regarding stroke volume during inspiration in dogs under positive-pressure ventilation?

Left ventricular (LV) stroke volume increases due to decreased LV afterload

Right ventricular (RV) stroke volume increases due to increased RV preload

Left ventricular (LV) stroke volume increases due to decreased LV afterload

Right ventricular (RV) stroke volume decreases due to increased RV preload

Which procedure could minimize the effect of positive-pressure ventilation on reduced cardiac output?

Increasing tidal volume

Increasing expiratory time

Increasing positive end-expiratory pressure

Increasing the fraction of inspired oxygen

You have a dog under positive-pressure ventilation and have obtained an arterial blood pressure waveform. The dog’s maximal pulse pressure during inspiration is 40 mmHg and minimal pulse pressure is 30 mmHg. What is its calculated pulse pressure variation?

Approximately 10%

Approximately 14%

Approximately 29%

Approximately 33%

MDRV2: Heart Lung Interactions

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