Initiation and Modification of Initiation and Modification of Therapeutic ProceduresTherapeutic Procedures

Achieve Adequate Respiratory Support

Instruct Patients in Deep Breathing / Muscle Training

Used in Acute Care:

Aid secretion clearance

Prevent or treat post-op atelectasis

Improve aerosol drug delivery

Used in rehabilitation to improve:

Efficiency of ventilation

Exercise tolerance

Instruct Patients in Deep Breathing / Muscle TrainingDeep Breathing Exercises:

Inspiratory Breathing Exercises Diaphragmatic (abdominal) breathing Lateral costal breathing

Promote effective use of diaphragm Improve efficiency of ventilation by increasing VT and

decreasing respiratory rate

Expiratory Breathing Exercises Pursed-lip breathing

Increases back pressure in the airways during exhalation

Can help lessen air-trapping

Instruct Patients in Deep Breathing / Muscle TrainingIncentive Spirometry

Used primarily in the acute care setting for patients at risk for or diagnosed with atelectasis, (typically following thoracic or abdominal surgery)

If the patient cannot cooperate or cannot generate an inspiratory capacity at least 33% of predicted, recommend IPPB as an alternative

Recommend discontinuation when clinical signs indicate resolution of atelectasis

Resolution of fever Improvement of breath sounds Normal chest X-ray Improved arterial oxygenation

Inspiratory Muscle Training Techniques (IMT)have largely replaced manual breathing exercises as the method of choice for COPD patients.

Flow and threshold resistors

Initiate and Adjust Mechanical Ventilation

IPPB Therapy

Indicated to:

Improve lung expansion in patients with atelectasis who cannot use other methods, such as incentive spirometry.

Aid in delivery of aerosolized drugs (usually when other methods have failed)

Provide short-term ventilatory support for patients with acute hypercapnic respiratory failure or chronic muscle weakness

Only absolute contraindication:

Untreated pneumothorax

IPPB initial settings:

Sensitivity of about -2 cm H2O

Cycle pressure between 10 and 20 cm H2O with a moderate flow

Approximate the O2% during the IPPB to the patient’s O2 therapy prescription

Attach to O2 blender with machine set to deliver pure source gas to deliver precise FiO2

Goal

To achieve quick and near-effortless on-triggering, followed by a relatively rapid pressure rise and ending in a short plateau.

Initiate and Adjust Mechanical Ventilation

Continuous Mechanical Ventilation Settings

Candidates who cannot properly select appropriate modes and set and adjust ventilator parameters will not be able to pass the CRT exam

The NBRC hospital expects you to be familiar with:

All common modes, including control mode, assist/control mode, SIMV, pressure support ventilation, CPAP, and bi-level positive airway pressure (BiPAP)

Dual breath modes such as pressure-regulated volume control (PRVC) and airway pressure release ventilation (APRV)

MODES Mechanical ventilation should be tailored to each patient’s

needs In the early stages of acute respiratory failure, you should

select or recommend a mode that provides full ventilatory support (A/C or normal-rate SIMV)

As patient improves and is able to carry more of the ventilatory load, you should begin using modes that allow or encourage spontaneous breathing (partial ventilatory support)

NBRC hospital

Expect the NBRC to emphasize selection of either volume- or pressure-oriented assist/control or SIMV (with or without pressure support) for most patients needing ventilatory support

Also apply PEEP to patients if they require more than 50% O2 to maintain adequate arterial oxygenation

CPAP (with backup ventilation) is the mode of choice for critically ill patients who have adequate ventilation but who due to shunting need extra support for oxygenation

Select volume-targeted ventilation if CO2 elimination is the primary goal and the patient comfort and lung distention are secondary issues.

Select pressure-targeted ventilation if patient-ventilator synchrony is important and CO2 elimination is of lesser concern.

Primary goals for adjusting ventilator settings:

Achieve acceptable arterial blood gases

Minimize dyspnea, accessory muscle use, and paradoxical breathing.

Review AARC Clinical Practice Guidelines for initial adult ventilator settings and adjustments.

Initiate and Adjust Mechanical VentilationNoninvasive Ventilation

The delivery of assisted mechanical ventilation without the need for an artificial tracheal airway.

Negative Pressure: iron lung or tank ventilator, chest curiass, pneumosuit

Positive Pressure: bi-level positive pressure support

Application of NPPV requires that the patient have control over upper airway function, be able to manage secretions, and be cooperative and motivated.

Initiate and Adjust Mechanical VentilationElevated Baseline Pressure (CPAP, PEEP)

CPAP Mode of ventilation Involves spontaneous breathing at an elevated baseline

pressuure Indicated to treat sleep apnea, acute cardiogenic pulmonary

edema, manage refractory hypoxemia in patients with adequate ventilation

PEEP Add-on that can be applied to any mode Used in patients for whom additional “machine” breaths are

needed to assure adequate ventilation Helps lower FiO2 needs Helps improve patient-ventilator synchrony (by decreasing

auto-PEEP)

NBRC Hospital standard of care is the application of low levels of PEEP (typically 5 cm H2O) to all adult patients receiving ventilatory support.

Helps maintain FRC and prevent airway closure/auto-PEEP

Maximize benefits and minimize risks to patient by determining “optimum” PEEP

Four methods to determine optimum PEEP Maximize O2 delivery to the tissues Highest static total compliance Maximum volume change for a given change in pressure Lowest pressure needed to exceed lower inflection point

(LIP or Pflex) on the pressure-volume curve

Select Ventilator Graphics

Select Ventilator Graphics

Scalar Graphics (time-based)

Flow vs. Time Identify presence of auto-PEEP (expiratory) Identify flow starvation (VCV) Assess / adjust rise time (PCV, PSV) Identify asynchrony

Pressure vs. Time Confirm PIP and PEEP level Visually assess mechanics using PIP-Pplat (~ Raw) and Pplat-PEEP

(~Cstat) Assess sensitivity/trigger response Identify asynchrony

Volume vs. Time Identify leaks Identify asynchrony

X-Y Loop Graphics (loops)

Pressure (X-axis) vs. volume (Y-axis) Assess overall work of breathing Identify overdistension Assess trigger work Adjust PSV levels

Volume (X-axis) vs. flow (Y-axis) Assess bronchodilator response Identify presence of auto-PEEP Identify leaks

Apply Disease-Specific Ventilator Protocols

National Heart, Lung, and Blood Institute (NHLBI) ARDS protocol

Consider implementing this protocol for any patient who exhibits an acute onset of respiratory distress not associated with heart failure and has:

A PaO2/FiO2 less than 300 (signifying acute lung injury) Bilateral diffuse infiltrates on X-ray consistent with

pulmonary edema

Initiate and Select Appropriate Settings for High-Frequency Ventilation

You need to be familiar with both infant/child and adult applications

Indicated for hypoxemic respiratory failure for infants/children/adults who have not responded to more conventional methods of improving oxygenation.

Decreasing HFOV frequency tends to lower the PaCO2, while increasing the HFOV frequency tends to raise the PaCO2

Initiate and Modify Weaning Parameters

Carefully monitoring the SBT provides the most valid information for deciding whether or not a patient can stay off the ventilator.

NBRC will assess your ability to independently implement a SBT protocol:

Straight T-tube breathing

CPAP

Pressure support

Pressure support + CPAP

Administer Medications

Aerosolized Drugs:

If the patient is receiving several inhaled medications, the recommended order is bronchodilator first, followed by mucolytic, then bronchial hygiene therapy, then steroids, and then the aerosolized antibiotic.

Endotracheal Instillation

Lidocaine, epinephrine, atropine, or naloxone (LEAN)

Mucolytics

Surfactant

Treating and Preventing HypoxemiaAdminister Oxygen

In otherwise normal patients, adjust the flow/FiO2 to the lowest level needed to maintain normal oxygenation (PaO2 of 80 – 100 torr with a saturation ≥ 95%)

If you cannot maintain normal oxygenation on less than 50% oxygen, accept a PaO2 ≥ 55-60 torr with a SaO2 (SpO2) ≥ 88%

When treating patients with carbon monoxide poisoning, cyanide poisoning, acute pulmonary edema, shock, trauma, or acute myocardial infarction in emergency settings, provide the highest possible FiO2

For patients with chronic hypoxemia, aim to keep the PaO2 in the 55-60 torr range to prevent depression of ventilation

In low birth weight or preterm infants at risk for ROP, your goal should be a PaO2 in the 50-70 torr range.

Position Patient to Minimize Hypoxemia

Semi-Fowler’s position (head of bed elevated 30 degrees) To minimize ventilator-associated pneumonia in patients

receiving mechanical ventilation

Lateral rotation therapy To prevent or minimize respiratory complications associated

with immobility in bedridden patients

“Keeping the good lung down” To improve the oxygenation in patients with unilateral lung

disease

Prone positioning To improve oxygenation in patients with ARDS and refractory

hypoxemia

Prevent Procedure-Associated Hypoxemia

Always monitor the patient’s SpO2 with a pulse oximeter prior to, during, and after any procedure that can cause hypoxemia.

Common Errors to Avoid on the Common Errors to Avoid on the ExamExam

Never use or recommend incentive spirometry for patients who cannot cooperate

Never administer IPPB to a patient with an untreated tension pneumothorax

Never use or recommend noninvasive positive pressure ventilation (NPPV) for patients who do not have control over upper airway function or cannot manage their secretions

Whenever possible, avoid plateau pressures above 30 cmH2O during mechanical ventilation

Do not use or recommend high-frequency oscillation ventilation for patients with obstructive lung disease

More Common Errors to Avoid on More Common Errors to Avoid on the Examthe Exam

Never administer a mucokinetic agent without also providing appropriate bronchial hygiene measures to facilitate secretion removal

Do not use or recommend mast cell stabilizers (cromolyn sodium, nedrocromil) for acute bronchospasm

Never mix Tobramycin (Tobi) with other drugs for inhalation

Avoid suctioning (if possible) for 6 hours following surfactant instillation

Never withhold supplemental oxygen from a patient who needs it

Exam Sure Bets Exam Sure Bets To confirm patient understanding of muscle training,

incentive spirometry, or IPPB, always require a “return demonstration” of the procedure by the patient

To prevent hyperventilation during IPPB, always instruct the patient to avoid forceful exhalation and to breathe slowly.

When initiating mechanical ventilation, always use a high FiO2 (0.60 - 0.90) until an ABG can be obtained.

Except with ARDS patients, when initiating mechanical ventilation, set the initial VT to 8 – 10 ml/kg IBW when targeting volume or set the pressure limit to 20 - 30 cm H2O when targeting pressure

More Exam Sure Bets More Exam Sure Bets To adjust a patient’s PaCO2 / pH during

mechanical ventilation, always change the rate first; change the VT / pressure limit only if rate changes exceed the recommended adult limits (8 – 24 breaths/min) or if you do not achieve the desired results.

Unless contraindicated, always use an oronasal / “full” face mask when initiating NPPV on patients with acute respiratory failure

To avoid esophageal opening / gastric distention, always keep IPAP levels during NPPV below 20 – 25 cm H2O

Whenever a patient’s cardiac output or blood pressure falls when raising the PEEP level, decrease PEEP back to its prior setting

More Exam Sure Bets More Exam Sure Bets

Always give the bronchodilator first when ordered in combination with a mucokinetic or anti-infective agent

To prevent pharyngitis and oral candidiasis with inhaled steroids, always have patients rinse their mouth out after administration

When treating patients with carbon monoxide poisoning, cyanide poisoning, acute pulmonary edema, shock, trauma, or acute myocardial infraction in emergency settings, always provide the highest possible FiO2

Reference:Reference:

Certified Respiratory Therapist Exam Review Guide, Craig Scanlon, Albert Heuer, and Louis SinopoliJones and Bartlett Publishers