Chapter 20: Pulmonary Therapeutic Management

Which of the following statements best describes the effects of positive-pressure ventilation on cardiac output? a. Positive-pressure ventilation increases intrathoracic pressure, which increases venous return and cardiac output. b. Positive-pressure ventilation decreases venous return, which increases preload and cardiac output. c. Positive-pressure ventilation increases venous return, which decreases preload and cardiac output. d. Positive-pressure ventilation increases intrathoracic pressure, which decreases venous return and cardiac output. REF: p. 500

ANS: D-Positive-pressure ventilation increases intrathoracic pressure, which decreases venous return and cardiac output. Positive-pressure ventilation increases intrathoracic pressure, which decreases venous return to the right side of the heart. Impaired venous return decreases preload, which results in a decrease in cardiac output.

Invasive Mechanical Ventilation: Lingo

-Control Breath: Vent initiates the breath -Assist Breath: The patient initiates the breath -Trigger: initiations the change from exhalation to inspiration -Limit: Maintains inspiration -Cycle: Ends inspiration -Baseline: Controlled during exhalation

Invasive Mechanical Ventilation: Nursing Management

-Patient assessment -Symptom management -Awakening and breathing coordination, delirium monitoring, early mobility, and family engagement and empowerment (ABCDEF) bundle

Invasive Mechanical Ventilation: Weaning

-Readiness to wean -Rapid, shallow breathing index (RSBI) -Screening -Trial -Signs of weaning intolerance

Four phases of ventilation to ventilate patient:

1.Change exhalation>>>inspiration 2.Inspiration 3.Change inspiration à exhalation 4.Exhalation

Which interventions minimize the complications associated with suctioning an artificial airway? (Select all that apply.) a. Hyperoxygenate the patient prior to the start of the procedure b. Hyperoxygenate the patient after each pass of the suction catheter c. Limit the duration of each suction pass to 20 seconds d. Instill 5 to 10 mL of normal saline to facilitate secretion removal e. Use intermittent suction to avoid damaging tracheal tissue REF: p. 497

ANS: A, B Hyperoxygenation and limiting the number of passes help avoid desaturation. There is no evidence to suggest that intermittent suction reduces damage, and saline instillation can actually increase the risk for infection.

The Passy-Muir valve is contraindicated in which patient? a. A patient who is trying to relearn normal breathing patterns b. A patient who has minimal secretions c. A patient with laryngeal or pharyngeal dysfunction d. A patient who wants to speak while on the ventilator REF: p. 498

ANS: C-A patient with laryngeal or pharyngeal dysfunction The Passy-Muir valve is contraindicated in patients with laryngeal or pharyngeal dysfunction, excessive secretions, or poor lung compliance.

Which of the following should be used when suctioning a mechanically ventilated patient? (Select all that apply.) a. Three hyperoxygenation breaths (breaths at 100% FiO2) b. Hyperinflation (breaths at 150% tidal volume) c. Limit the number of passes to three. d. Instill 5 to 10 mL of normal saline to facilitate secretion removal. e. Use intermittent suction to avoid damaging tracheal tissue.

ANS: A, B, C Hyperoxygenation, hyperinflation, and limiting the number of passes help avoid desaturation. There is no evidence to suggest that intermittent suction reduces damage, and saline instillation can actually increase the risk for infection.

Which of the following are complications of endotracheal tubes? (Select all that apply.) (TRICK QUESTION) a. Tracheoesophageal fistula b. Cricoid abscess c. Tracheal stenosis d. Tube obstruction e. Hemorrhage REF: p. 493|Table 20-3

ANS: A, B, C, D Complications of endotracheal tubes include tube obstruction, tube displacement, sinusitis and nasal injury, tracheoesophageal fistula, mucosal lesions, laryngeal or tracheal stenosis, and cricoid abscess. Hemorrhage is a complication of tracheostomy tubes.

Complications of ETT tubes include (Select all that apply.) a. tracheoesophageal fistula. b. cricoid abscess. c. tracheal stenosis. d. tube obstruction. e. tube displacements. REF: p. 493|Table 20-3

ANS: A, B, C, D, E Complications of endotracheal tubes include tube obstruction, tube displacement, sinusitis and nasal injury, tracheoesophageal fistula, mucosal lesions, laryngeal or tracheal stenosis, and cricoid abscess.

Identify the clinical manifestations associated with oxygen toxicity. (Select all that apply.) a. Substernal chest pain that increases with deep breathing b. Moist cough and tracheal irritation c. Pleuritic pain occurring on inhalation, followed by dyspnea d. Increasing CO2 e. Sore throat and eye and ear discomfort REF: p. 489

ANS: A, C, E A number of clinical manifestations are associated with oxygen toxicity. The first symptom is substernal chest pain that is exacerbated by deep breathing. A dry cough and tracheal irritation follow. Eventually, definite pleuritic pain occurs on inhalation followed by dyspnea. Upper airway changes may include a sensation of nasal stuffiness, sore throat, and eye and ear discomforts.

The assist-control mode of ventilation functions in which of the following manners? a. It delivers gas at preset volume, at a set rate, and in response to the patient's inspiratory efforts. b. It delivers gas at a preset volume, allowing the patient to breathe spontaneously at his or her own volume. c. It applies positive pressure during both ventilator breaths and spontaneous breaths. d. It delivers gas at the preset rate and tidal volume regardless of the patient's inspiratory efforts. REF: p. 500

ANS: A-It delivers gas at preset volume, at a set rate, and in response to the patient's inspiratory efforts. Whereas a breath that is initiated by the patient is known as a patient-triggered or patient-assisted breath, a breath that is initiated by the ventilator is known as a machine-triggered or machine-controlled breath. A time-triggered breath is a machine-controlled breath that is initiated by the ventilator after a preset length of time has elapsed. It is controlled by the rate-setting on the ventilator (e.g., a rate of 10 breaths/min yields 1 breath every 6 seconds). Flow-triggered and pressure-triggered breaths are patient-assisted breaths that are initiated by decreased flow or pressure, respectively, within the breathing circuit.

Which of the following oxygen administration devices can deliver oxygen concentrations of 90%? Which oxygen administration device can deliver oxygen concentrations of 90%? a. Nonrebreathing mask b. Nasal cannula c. Partial rebreathing mask d. Simple mask REF: p. 488|Table 20-1

ANS: A-Nonrebreathing mask With an FiO2 of 55% to 70%, a nonrebreathing mask with a tight seal over the face can deliver 90% to 100% oxygen. It is used in emergencies and short-term therapy requiring moderate to high FiO2.

Which of the following levels would be classified as a low-flow system of oxygen administration? a. O2 via nasal cannula at 4 L/min b. O2 via nasal catheter at a FiO2 range of 60% to 75% c. O2 via transtracheal catheter at 10 L/min d. O2 via simple mask at 12 L/min. (Which oxygen delivery device is considered a low-flow system?) REF: p. 488|Table 20-1

ANS: A-O2 via nasal cannula at 4 L/min A low-flow oxygen delivery system provides supplemental oxygen directly into the patient's airway at a flow of 8 L/min or less. Because this flow is insufficient to meet the patient's inspiratory volume requirements, it results in a variable FiO2 as the supplemental oxygen is mixed with room air. Nasal catheter FiO2 range is 22% to 45%. Oxygen flow through a transtracheal catheter is 0.25 to 4 L/min. A simple mask is a reservoir delivery system.

Which route for ETT placement is used in an emergency? a. Orotracheal b. Nasotracheal c. Nasopharyngeal d. Trachea (Which route for endotracheal (ET) tube placement is usually used in emergency intubation?) REF: p. 490

ANS: A-Orotracheal An endotracheal tube (ETT) may be placed through the orotracheal or the nasotracheal route. In most situations involving the emergency placement, the orotracheal route is used because it is simpler and allows the use of a larger diameter ETT. Nasotracheal intubation provides greater patient comfort over time and is preferred in patients with a jaw fracture.

A patient was admitted to the critical care unit with acute respiratory failure. The patient has been on a ventilator for 3 days and is being considered for weaning. The ventilator high-pressure alarm keeps going off. When you enter the room, the ventilator inoperative alarm sounds. All of the following conditions would set off the high-pressure alarm EXCEPT: a. a leak in the patient's endotracheal (ET) tube cuff b. a kink in the ET tubing c. coughing d. increased secretions in the patient's airway REF: p. 507|Table 20-8

ANS: A-a leak in the patient's ET tube cuff Low inspiratory pressure alarms will sound because of altered settings, unattached tubing or a leak around the endotracheal tube (ETT), the ETT displaced into the pharynx or esophagus, poor cuff inflation Tracheoesophageal fistula, peak flows that are too low, low tidal volume (Vt), decreased airway resistance resulting from decreased secretions or relief of bronchospasm, increased lung compliance resulting from decreased atelectasis, reduction in pulmonary edema, resolution of ARDS, or a change in position. High-pressure alarms will sound because of improper alarm setting; airway obstruction resulting from patient fighting ventilator (holding breath as ventilator delivers Vt); patient circuit collapse; kinked tubing The ETT in the right mainstem bronchus or against the carina; cuff herniation; increased airway resistance resulting from bronchospasm, airway secretions, plugs, and coughing; water from the humidifier in the ventilator tubing Decreased lung compliance resulting from tension pneumothorax, change in patient position, acute respiratory distress syndrome, pulmonary edema, atelectasis, pneumonia, or abdominal distention.

The finding of normal breath sounds on the right side of the chest and absent breath sounds on the left side of the chest in a newly intubated patient is probably caused by a a. right mainstem intubation. b. left pneumothorax. c. right hemothorax. d. gastric intubation. (When assessing an intubated patient, the nurse notes normal breath sounds on the right side of the chest and absent breath sounds on the left side of the chest. What problem should the nurse suspect?) REF: p. 491

ANS: A-right mainstem intubation. The finding of normal breath sounds on the right side of the chest and absent breath sounds on the left side of the chest in a newly intubated patient is probably caused by a right mainstem intubation.

Which statements regarding rotation therapies are accurate? (Select all that apply.) a. Continuous lateral rotation therapy (CLRT) can be effective for improving oxygenation if used for at least 18 hours/day. b. Kinetic therapy can decrease the incidence of ventilator-acquired pneumonia in neurologic and postoperative patients. c. Use of rotational therapy eliminates the need for other pressure ulcer prevention strategies. d. CLRT helps avoid hemodynamic instability secondary to the continuous, gentle turning of the patient. e. CLRT has minimal pulmonary benefits for critically ill patients. REF: p. 509

ANS: B, E Studies have found that to achieve benefits with rotation therapy, rotation must be aggressive, and the patient must be at least 40 degrees per side, with a total arc of at least 80 degrees for at least 18 hours a day. Kinetic therapy has been shown to decrease the incidence of ventilator-acquired pneumonia, particularly in neurologic and postoperative patients. Complications of the procedure include dislodgment or obstruction of tubes, drains, and lines; hemodynamic instability; and pressure ulcers. Lateral rotation does not replace manual repositioning to prevent pressure ulcers. Continuous lateral rotation therapy (CLRT) has been shown to be of minimal pulmonary benefit for critically ill patients.

What is the therapeutic blood level for theophylline (Xanthines)? a.5 to 10 mg/dL b. 10 to 20 mg/dL c. 20 to 30 mg/dL d. 35 to 45 mg/dL REF: p. 513|Table 20-10

ANS: B- 10 to 20 mg/dL Therapeutic blood level for theophylline is 10 to 20 mg/dL.

A patient with acute lung failure has been on a ventilator for 3 days and is being considered for weaning. The ventilator high-pressure limit alarm keeps alarming. What would cause this problem? a. A leak in the patient's endotracheal (ET) tube cuff b. A kink in the ventilator tubing c. The patient is disconnected from the ventilator d. A faulty oxygen filter REF: p. 507|Table 20-8

ANS: B- A kink in the ventilator tubing High-pressure alarms will sound because of improper alarm setting; airway obstruction resulting from patient fighting ventilator (holding breath as ventilator delivers Vt); patient circuit collapse; kinked tubing The endotracheal tube in the right mainstem bronchus or against the carina; cuff herniation; increased airway resistance resulting from bronchospasm, airway secretions, plugs, and coughing Water from the humidifier in the ventilator tubing Decreased lung compliance resulting from tension pneumothorax, change in patient position, acute respiratory distress syndrome, pulmonary edema, atelectasis, pneumonia, or abdominal distention.

Which medication may be administered with a bronchodilator because it can cause bronchospasms? a.Beta-2 agonist b. Mucloytics c. Anticholinergic agents d. Xanthines REF: p. 513|Table 20-10

ANS: B- Mucloytics Mucolytics may be administered with a bronchodilator because it can cause bronchospasms and inhibit ciliary function. Treatment is considered effective when bronchorrhea develops and coughing occurs. β2-Agonists are used to relax bronchial smooth muscle and dilate airways to prevent bronchospasms. Anticholinergic agents are used to block the constriction of bronchial smooth muscle and reduce mucus production. Xanthines are used to dilate bronchial smooth muscle and reverse diaphragmatic muscle fatigue.

A patient was admitted to the critical care unit with acute respiratory failure. The patient has been on a ventilator for 3 days and is being considered for weaning. The ventilator high-pressure alarm keeps going off. When you enter the room, the ventilator inoperative alarm sounds. What is the primary action the nurse would take? a. Troubleshoot the ventilator until the problem is found. b. Take the patient off the ventilator and manually ventilate her. c. Call the respiratory therapist for help. d. Silence the ventilator alarms until the problem is resolved. REF: p. 492

ANS: B- Take the patient off the ventilator and manually ventilate her. Ensure emergency equipment is at bedside at all times (e.g., manual resuscitation bag connected to oxygen, masks, suction equipment or supplies), including preparations for power failures. If the ventilator malfunctions, the patient should be removed from the ventilator and ventilated manually with a manual resuscitation bag.

The most accurate and reliable control of FiO2 can be achieved through the use of a(n) a. simple mask. b. nonrebreathing circuit (closed). c. air-entrainment mask. d. nonrebreathing mask. OR MAY ASK!!! Which oxygen therapy device should is used in a patient requiring the delivery of a precise low FiO2? a. Simple mask b. Nasal cannula c. Air-entrainment mask d. Partial rebreathing mask REF: p. 488|Table 20-1

ANS: B- nonrebreathing circuit (closed). The most reliable and accurate means of delivering a prescribed concentration of oxygen is through the use of a nonrebreathing circuit (closed). ANS: C An air-entrainment mask is used in patients requiring the delivery of a precise low FiO2. A simple mask, partial rebreathing mask, and nasal cannula are not able to provide a precise level of oxygen as an air-entrainment mask.

Nursing management of the patient receiving a neuromuscular blocking agent should include? a. withholding all sedation and narcotics. b. protecting the patient from the environment. c. keeping the patient supine. d. speaking to the patient only when necessary. (What nursing interventions should be included in the nursing management of the patient receiving a neuromuscular blocking agent?) REF: p. 505

ANS: B- protecting the patient from the environment. Patient safety is a major concern for the patient receiving a neuromuscular blocking agent because these patients are unable to protect themselves from the environment. Special precautions should be taken to protect the patient at all times.

A patient with acute lung failure has been on a ventilator for 3 days and is being considered for weaning. The ventilator high-pressure limit alarm keeps alarming. What would cause this problem? a. A leak in the patient's endotracheal (ET) tube cuff b. A kink in the ventilator tubing c. The patient is disconnected from the ventilator d. A faulty oxygen filter REF: p. 507|Table 20-8

ANS: B-A kink in the ventilator tubing High-pressure alarms will sound because of improper alarm setting; airway obstruction resulting from patient fighting ventilator (holding breath as ventilator delivers Vt) -Patient circuit collapse; kinked tubing; the endotracheal tube in the right mainstem bronchus or against the carina; cuff herniation; increased airway resistance resulting from bronchospasm, airway secretions, plugs, and coughing -Water from the humidifier in the ventilator tubing; and decreased lung compliance resulting from tension pneumothorax, change in patient position, acute respiratory distress syndrome, pulmonary edema, atelectasis, pneumonia, or abdominal distention.

Which of the following statements is correct concerning endotracheal tube cuff management? a. The cuff should be deflated every hour to minimize pressure on the trachea. b. A small leak should be heard on inspiration if the cuff has been inflated using the minimal leak technique. c. Cuff pressures should be kept between 40 to 50 mm Hg to ensure an adequate seal. d. Cuff pressure monitoring should be done once every 24 hours. REF: p. 495

ANS: B-A small leak should be heard on inspiration if the cuff has been inflated using the minimal leak technique. The minimal leak technique consists of injecting air into the cuff until no leak is heard and then withdrawing the air until a small leak is heard on inspiration. Problems with this technique include difficulty maintaining positive end-expiratory pressure and aspiration around the cuff.

Patient safety precautions when working with oxygen include which action? a. Observing for signs of oxygen-associated hyperventilation b. Ensuring the oxygen device is properly positioned c. Removal of all oxygen devices when eating d. Administration of oxygen at the nurse's discretion REF: p. 489

ANS: B-Ensuring the oxygen device is properly positioned Patient safety precautions when working with oxygen involve administration of oxygen and monitoring of its effectiveness. Activities include restricting smoking, administering supplemental oxygen as ordered, observing for signs of oxygen-induced hypoventilation, monitoring the patient's ability to tolerate removal of oxygen while eating Changing the oxygen delivery device from a mask to nasal prongs during meals as tolerated.

A patient was admitted to the critical care unit with acute respiratory failure. The patient has been on a ventilator for 3 days and is being considered for weaning. The ventilator high-pressure alarm keeps going off. When you enter the room, the ventilator inoperative alarm sounds. Which of the following criteria would indicate that the patient is ready to be weaned? a. FiO2 greater than 50% b. Rapid shallow breathing index less than 105 c. Minute ventilation greater than 10 L/min d. Vital capacity/kg greater than or equal to 15 mL REF: pp. 503-504

ANS: B-Rapid shallow breathing index less than 105 The rapid shallow breathing index (RSBI) has been shown to be predictive of weaning success. To calculate the RSBI, the patient's respiratory rate and minute ventilation are measured for 1 minute during spontaneous breathing. The measured respiratory rate is then divided by the tidal volume (expressed in liters). An RSBI less than 105 is considered predictive of weaning success. If the patient meets criteria for weaning readiness and has an RSBI less than 105, a spontaneous breathing trial can be performed.

A patient with acute lung failure has been on a ventilator for 3 days and is being considered for weaning. When entering the room, the ventilator inoperative alarm sounds. What action should the nurse take FIRST? a. Troubleshoot the ventilator until the problem is found. b. Take the patient off the ventilator and manually ventilate. c. Call the respiratory therapist for help. d. Silence the ventilator alarms until the problem is resolved. REF: p. 492

ANS: B-Take the patient off the ventilator and manually ventilate. Ensure emergency equipment is at the bedside at all times (eg, manual resuscitation bag connected to oxygen, masks, suction equipment or supplies), including preparations for power failures. If the ventilator malfunctions, the patient should be removed from the ventilator and ventilated manually with a manual resuscitation bag.

The ventilator variable that causes inspiration is called the a. cycle. b. trigger. c. flow. d. pressure. (Which ventilator phase variable initiates the change from exhalation to inspiration?) REF: p. 499

ANS: B-b. trigger. The phase variable that initiates the change from exhalation to inspiration is called the trigger. Breaths may be pressure triggered or flow triggered based on the sensitivity setting of the ventilator and the patient's inspiratory effort or time-triggered based on the rate-setting of the ventilator.

A patient was taken to surgery for a left lung resection earlier today. The patient has been in the postoperative care unit for 30 minutes. When you are completing your assessment, you notice that the chest tube has drained 125 cc of red fluid in the past 30 minutes. The nurse contacts the physician and suspects that the patient has developed: a. pulmonary edema. b. hemorrhage. c. acute lung failure. d. bronchopleural fistula. REF: p. 511

ANS: B-hemorrhage. Hemorrhage is an early, life-threatening complication that can occur after a lung resection. It can result from bronchial or intercostal artery bleeding or disruption of a suture or clip around a pulmonary vessel. Excessive chest tube drainage can signal excessive bleeding. During the immediate postoperative period, chest tube drainage should be measured every 15 minutes; this frequency should be decreased as the patient stabilizes. If chest tube loss is greater than 100 mL/hr, fresh blood is noted, or a sudden increase in drainage occurs, hemorrhage should be suspected.

Patient safety precautions when working with oxygen involve: a. observation for signs of oxygen-introduced hyperventilation. b. restriction of smoking. c. removal of all oxygen devices when eating to prevent aspiration. d. administration of oxygen at the nurse's discretion. REF: p. 489

ANS: B-restriction of smoking. Patient safety precautions when working with oxygen involve administration of oxygen and monitoring of its effectiveness. Activities include restricting smoking, administering supplemental oxygen as ordered Observing for signs of oxygen-induced hypoventilation, monitoring the patient's ability to tolerate removal of oxygen while eating Changing the oxygen delivery device from a mask to nasal prongs during meals as tolerated

A patient was admitted to the critical care unit with acute respiratory failure. The patient has been on a ventilator for 3 days and is being considered for weaning. The ventilator high-pressure alarm keeps going off. When you enter the room, the ventilator inoperative alarm sounds. Which of the following criteria would indicate that the patient IS NOT tolerating weaning? a. A decrease in heart rate from 92 to 80 beats/min b. An SpO2 of 92% c. An increase in respiratory rate from 22 to 38 breaths/min d. Spontaneous tidal volumes of 300 to 350 mL REF: p. 505|Box 20-5

ANS: C-An increase in respiratory rate from 22 to 38 breaths/min Weaning intolerance indicators include: (1) a decrease in level of consciousness (2) a systolic blood pressure increased or decreased by 20 mm Hg (3) a diastolic blood pressure greater than 100 mm Hg (4) a heart rate increased by 20 beats/min (5) premature ventricular contractions greater than 6/min, couplets, or runs of ventricular tachycardia (6) changes in ST segment (usually elevation) (7) a respiratory rate greater than 30 breaths/min or less than 10 breaths/min (8) a respiratory rate increased by 10 breaths/min (9) a spontaneous tidal volume less than 250 mL (10) a PaCO2 increased by 5 to 8 mm Hg or pH less than 7.30 (11) an SpO2 less than 90% (12) use of accessory muscles of ventilation (13) complaints of dyspnea, fatigue, or pain (14) paradoxical chest wall motion or chest abdominal asynchrony (15) diaphoresis (16) severe agitation or anxiety unrelieved with reassurance.

25. What is an indication for a pneumonectomy? a.Peripheral granulomas b.Bronchiectasis c.Unilateral tuberculosis d.Single lung abscess REF: p. 510|Table 20-9

ANS: C-Unilateral tuberculosis A pneumonectomy is the removal of entire lung with or without resection of the mediastinal lymph nodes. Indications include malignant lesions, unilateral tuberculosis, extensive unilateral bronchiectasis, multiple lung abscesses, massive hemoptysis, and bronchopleural fistula.

Use of oxygen therapy in the patient who is hypercapnic may result in? a. oxygen toxicity. b. absorption atelectasis. c. carbon dioxide retention. d. pneumothorax. REF: p. 489

ANS: C-carbon dioxide retention. Deoxygenated hemoglobin carries more CO2 compared with oxygenated hemoglobin. Administration of oxygen increases the proportion of oxygenated hemoglobin, which causes increased release of CO2 at the lung level. Because of the risk of CO2 accumulation, all patients who are chronically hypercapnic require careful low-flow oxygen administration.

Nursing interventions to limit the complications of suctioning include? a. inserting the suction catheter no more than 5 inches. b. premedicating the patient with atropine. c. hyperoxygenating the patient with 100% oxygen. d. increasing the suction to 150 mm Hg. REF: p. 497

ANS: C-hyperoxygenating the patient with 100% oxygen. Hypoxemia can be minimized by giving the patient three hyperoxygenation breaths (breaths at 100% FiO2) with the ventilator before the procedure and again after each pass of the suction catheter.

Long-term ventilator management over 21 days is best handled through use of a(n) a. oropharyngeal airway. b. esophageal obturator airway. c. tracheostomy tube. d. endotracheal intubation. (Which airway would be the most appropriate for a patient requiring intubation longer than 21 days?) REF: p. 492

ANS: C-tracheostomy tube. Although no ideal time to perform the procedure has been identified, it is commonly accepted that if a patient has been intubated or is anticipated to be intubated for longer than 7 to 10 days, a tracheostomy should be performed.

Which of the following arterial blood gas values would indicate a need for oxygen therapy? Which arterial blood gas (ABG) values would indicate a need for oxygen therapy? a. PaO2 of 80 mm Hg b. PaCO2 of 35 mm Hg c.HCO3− of 24 mEq d. SaO2 of 87% REF: p. 487

ANS: D-SaO2 of 87% The amount of oxygen administered depends on the pathophysiologic mechanisms affecting the patient's oxygenation status. In most cases, the amount required should provide an arterial partial pressure of oxygen (PaO2) of greater than 60 mm Hg or an arterial hemoglobin saturation (SaO2) of greater than 90% during both rest and exercise.

The correct procedure for selecting an oropharyngeal airway is to: To select the correct size of an oropharyngeal airway, the nurse should ensure the airway extends from which area to which area? a. measure from the tip of the nose to the ear lobe. b. measure from the mouth to the ear lobe. c. measure from the tip of the nose to the middle of the trachea. d. measure the airway from the corner of the patient's mouth to the angle of the jaw. REF: p. 490|Figure 20-1

ANS: D-measure the airway from the corner of the patient's mouth to the angle of the jaw. An oropharyngeal airway's proper size is selected by holding the airway against the side of the patient's face and ensuring that it extends from the corner of the mouth to the angle of the jaw. If the airway is improperly sized, it will occlude the airway. Nasopharyngeal airways are measured by holding the tube against the side of the patient's face and ensuring that it extends from the tip of the nose to the ear lobe.

Preset positive pressure used to augment the patient's inspiratory effort is known as? a. positive end-expiratory pressure (PEEP). b. continuous positive airway pressure (CPAP). c. pressure control ventilation (PCV). d. pressure support ventilation (PSV). REF: p. 500|Table 20-5

ANS: D-pressure support ventilation (PSV) Preset positive pressure used to augment the patient's inspiratory efforts is known as pressure support ventilation. With continuous positive airway pressure, positive pressure is applied during spontaneous breaths; the patient controls rate, inspiratory flow, and tidal volume. Positive end-expiratory pressure is positive pressure applied at the end of expiration of ventilator breaths.

Principles of Therapy

Goal: Ensure adequate cellular oxygenation -Oxygen is a medication -Requires a physician's order -Indication: Hypoxemia Administration -Dose-response method: -Lowest possible level of oxygen is administered that will still achieve a satisfactory PaO2 or SaO2.

Invasive Mechanical Ventilation: Complications

Ventilator-induced lung injury -Barotrauma: extra pressure in alveoli -Volutrauma: extra volume in alveoli -Atelectrauma: shearing from opening and closing of the alveoli -Biotrauma: initiation of the inflammatory- immune response Cardiovascular compromise from increased intrathoracic pressure results in: -Decreased venous return -Impaired cerebral venous return -Increased ICP