-Volume Ventilation vs Pressure Ventilation

Question 1

Volume Ventilation

-Also Known As

Answer 1

-Volume-limited ventilation

	-Volume-Targeted Ventilation

	-Volume-Controlled Ventilation	

	-Volume-Cycled Ventilation

Question 2

Volume Ventilation

-Defination & Charateristics

Answer 2

-Airflow is delivered by a mechanical vent that terminates the inspiratory phase of respiratory cycle after a preset volume is reached

-Major characteristics

	-Volume is always set and stays the same, whereas pressure varies

Question 3

Volume Ventilation

Advantages and Disadvantages

Answer 3

-Primary advantages

	-A constant tidal volume (and/ or minute ventilation) is delivered regardless of changes in Pts compliance or airway resistance

-Major disadvantage

	-Alveolar overdistension leading to increased PIP if lung conditions worsens( I.E., increased airway resistance and/ or decreased compliance)

-In general

	-Use volume ventilation if precise PaCO2 regulation is more important than overdistention protection or pt vent synchrony

Question 4

Pressure Ventilation

-Also Known as

Answer 4

-Pressure-limited ventilation

	-Pressure-tragter ventilation

	-Pressure controlled ventilation

Question 5

Pressure Ventilation

Definition and Charateristics

Answer 5

-Definition, airflow is delivered by mechanical ventilation that terminates the inspiratory phase of the respiratory cycle when a preset pressure is reached

-Major Characteristics

	-Pressure is set and always the same, whereas volume varies

Question 6

Pressure Ventilation

Advantages and Disadvantages

Answer 6

-Primary advantages

	-A Constant inflation pressure is delivered regardless of tidal volume delivery (limits inflation pressure to reduced risk of alveolar distention)

-Major disadvantage

	-Volume delivery (tidal volume and minute ventilation varies as lung conditions changes) , either increased or decreased airway resistance (RAW) and or compliance

-In general

	-Use pressure ventilation if overdistention protection or patient ventilator Synchrony is more important that precise PaCO2 regulation (e.g., ARDS)

Question 7

-Volume Ventilation=VT (set) PIP (variable)

Answer 7

-Incresed VT= Increased PIP and Pplat

	-Decreased Vt= Decreased PIP and Pplat

	-Increased Compliance = Same Vt ( Decreased PIP and Pplat)

	-Decreased Compliance= Same Vt (increased PIP and PPlat

	-Increased RAW = Same vt (increased PIP)

	-Decreased RAW= Same Vt (decreased PIP)

Question 8

-Pressure Ventilation= PIP(set) Vt (variable)

Answer 8

-Increased PIP= Increased Vt

	-Decreased PIP= Decreased VT

	-Increased COmpliance= Same PIP (VT) increases

	-Decreased Compliance= Same PIp ( Decreased VT)

	-Increased RAW= Same PIP (decreased VT)

	-Decreased RAW= Same PIP (Increased VT)

Question 9

ventilator check

Answer 9

-When Performing a ventilator check, it is important to check ventilating pressure and record data

	-When both pressures (PIP and Pplat) increases= a Compliance issues ( decreased Compliance)

		-Examples: ARDS, Pneumonia, atelectasis, etc.

	-When Ppeak is increased but Pplat is stable= Increased Airway resistance

		-Examples: Bronchospasm, kinked circuit, secretions, etc.