Lung mechanics during mechanical ventilation

Lung mechanics during mechanical ventilation - Respiratory

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espiratory mechanics in Respiratory mechanics in mechanical ventilation Arjun Srinivasan
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Introduction echanics during ventilation Mechanics during ventilation PV curves Application in health & disease ifficulties & pitfalls Difficulties & pitfalls The future….
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onitoring Mechanics Monitoring Mechanics Pressure, flow, and volume Time based graphics (waveforms) Pressure Flow olume Volume Derived measures Compliance p Resistance Loops Pressure volume Flow volume
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ressures Pressures Peak inspiratory pressure (PIP) Pressure generated to drive gas into the lungs to overcome resistance & elastic property of RS Dependant on flow, resistance, TV, compliance & PEEP Slope of the curve depends on flow pattern lateau pressure( Plateau pressure( P plat ) Measured after E ins pause of ~2 secs Represents alveolar pressure True inflation pressure
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EEP PEEP i Presence of positive P aw at E exp in the absence of PEEP E Measured by application of E exp pause Etiology Dynamic hyperinflation with airflow obstruction Dynamic hyperinflation without airflow obstruction Without either Leads to Hyperinflation volutrauma Decreases trigger sensitivity fatigue Hemodynamic compromise
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ow with EEP w Flow with PEEP i flo inhalation time 0 auto PEEP exhalation
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EEP PEEP E Positive end expiratory pressure set by the clinician Ashbaugh & Petty in 1967 as useful tool in Mx f ARDS of ARDS Our understanding continues to evolve Is being applied in wide variety of pulmonary isorders disorders So how does it work?
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ema & /or PEEP E Edema & /or atelectasis FRC compliance Shunt Work of breathing P a O 2 Principles & practice of mechanical ventilation Martin J. Tobin
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Obstructive airway disease y PEEP E Inspiratory threshold load (PEEP i ) Work of reathing Triggering of ntilator breathing ventilator Principles & practice of mechanical ventilation Martin J. Tobin
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ng inflation & mechanics Lung inflation & mechanics P rs = P AO + P mus = V x R + V/C V = flow = resistance R = resistance V = volume C = compliance of sytem uring mechanical ventilation During mechanical ventilation P = P = V x R + V/C
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This note was uploaded on 12/03/2011 for the course MEDICINE 350 taught by Professor Dr.aslam during the Winter '07 term at Medical College.

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Lung mechanics during mechanical ventilation - Respiratory

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