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SPC Adv Modalities

SPC Adv Modalities Unit 1

Scalars or variables used in vent graphics? Pressure, flow, & volume graphed over time
Pressure is measured in? cmH2O
Time is measured in? seconds or minutes
Flow is measured in? L/m
Volume is measured in? mL or Liters
Where will you find the Ordinate & the Abscissa? Y axis & X axis
When is the rate of change the greatest? Beginning of the event
When is the rate of change the smallest? End of the event
Time constants are influenced by: Changes in vent settings (flow, pressure, Vt), total rate, compliance, & resistance
Short time constant implies: A fast rate of change
Long time constant implies: A slow rate of change
Benefits of short I-time: Allows for longer E-time, reduces risk or occurrence of auto-PEEP, promotes venous return
Disadvantages of short I-time: Promotes greater flow turbulence, reduces alveolar ventilation, promotes higher peak airway pressures
Benefits of short E-time: None
Disadvantages of short E-time: May reduce venous return & cardiac output, drop BP, promotes Auto-PEEP
Benefits of long I-time: Can improve PaO2, diffusion time is extended
Disadvantages of long I-time: Shortens E-time = can reduce venous return, may compromise cardiac output, patient can't exhale sooner
Benefits of long E-time: Promotes venous return, reduces Auto-PEEP
Disadvantages of long E-time: Odd breathing pattern - pt may want to take a breath sooner but can't
Factors that influence waveforms: Compliance, resistance, flowrate, rate (bpm)
Problems associated w/ reduced compliance: Atelectasis - collapsed alveoli, Lung collapse - pneumothorax
Causes for loss of lung compliance: ARDS, atelectasis, pneumo, fibrosis, pneumonia, P.E., mainstem intubation, pleural effusion, gastric distension, ascites
Iatrogenic causes of compliance loss: High PEEP/CPAP settings, high Vt, high pressure, high FiO2 resulting in nitrogen washout
Acute causes of resistance: airway secretions, bronchospasm, biting E/T tube, kinked E/T tube, aspiration of foreign body (usually during trauma)
Chronic causes of resistance: Airway edema, mucus migration into E/T tube, plugged filters, overly wet HME's
Benefits of low flow rates: Lower airway pressures, improved gas distribution, long I-time = improved oxygenation
Possible problems with low flow rates: Extended I-time = smaller E-time = possible auto-peep and reduced venous return
Created by: vgflgirl