Bag-valve-mask (BVM) ventilation: a guide for nursing students

Bag-valve-mask (BVM) ventilation is the most important manual airway skill in nursing. When a patient stops breathing – or cannot breathe adequately – a correctly applied BVM delivers oxygen and ventilation in seconds without intubation. Every nurse practicing in any setting where patients can deteriorate must be competent with BVM. A poorly sealed mask delivers no air to the lungs regardless of how vigorously the bag is squeezed; a bag squeezed too hard inflates the stomach, triggers vomiting, and risks aspiration. The margin between effective rescue ventilation and a potentially fatal mistake is technique, not effort.

This guide covers the BVM’s components, correct mask sizing, the E-C clamp and two-person techniques, tidal volume and rate targets across the lifespan, oxygen delivery, airway adjuncts, special populations, and the errors most likely to harm a patient – and appear on NCLEX.

Quick-reference summary

What is a BVM?

A BVM is a self-contained manual ventilation device. It delivers positive-pressure ventilation without an external power source, making it the default airway tool in cardiac arrest, respiratory failure, and procedural sedation. The device is commonly called an Ambu bag – a brand name that has become generic, in the same way “Kleenex” is used for any facial tissue.

Understanding each component is essential for troubleshooting on the fly. If ventilation fails, you need to know immediately which part of the circuit has failed.

How oxygen delivery works

The BVM is a self-inflating device. When you release the bag, it draws gas in through the inlet valve. If a reservoir bag is attached and the O₂ flow rate matches or exceeds consumption, the reservoir fills with 100% oxygen between each compression. The next squeeze delivers that oxygen-enriched gas to the patient.

Without a reservoir: The bag re-inflates with a mixture of room air (21% O₂) drawn through the air-intake port and whatever residual oxygen remains. FiO₂ typically reaches only 40–60%, even at 10–15 L/min – insufficient for a patient in respiratory arrest.

With reservoir at 10–15 L/min: FiO₂ approaches 90–95%. This is the target configuration for any adult or pediatric patient in acute distress.

Flow rate matters: Running oxygen at less than 10 L/min does not fill the reservoir fast enough to maintain high FiO₂. Many nurses instinctively set oxygen at 6–8 L/min because that is a typical nasal cannula setting – this is an error. BVM oxygen flow should be 10–15 L/min. During CPR, use the highest feasible inspired oxygen concentration for every patient, including those with COPD (AHA 2025; BTS 2017 recommendation E1). Do not reduce the flow because of “hypoxic drive” concerns: the British Thoracic Society guideline explains that oxygen-induced hypercapnia in COPD comes mainly from worsening ventilation-perfusion mismatch, with loss of hypoxic drive making only a small contribution. Once spontaneous circulation returns and oximetry is reliable, BTS recommendation E1 is to titrate down to a target range – 94–98% for most patients, or 88–92% once a blood gas confirms hypercapnic respiratory failure. Newborns are the exception at the start of resuscitation: they begin at 21–30% oxygen (higher for very preterm infants) titrated to SpO₂ targets.

Mask sizing

An ill-fitting mask is the most common cause of failed BVM ventilation. Even perfect bag compression delivers nothing if there is a leak at the face. The mask must cover from the bridge of the nose to the chin cleft – it must not cover the eyes (which triggers eye injury from pressure and breaks the seal at the top) and must not slip below the chin.

Practical sizing rule: Hold the mask at the bridge, with the apex pointing toward the patient’s nose. It should span from the nasal bridge to the chin cleft without reaching the eyes and without the edge dropping below the lower border of the mandible. If the mask covers any part of the eye orbit, size down. If it does not reach the chin cleft, size up.

E-C clamp technique (one-person BVM)

The E-C clamp is the standard one-person mask seal technique. It is named for the hand positions used to hold the mask: three fingers form an “E” on the jaw; thumb and index finger form a “C” over the mask.

Setup: Position yourself at the patient’s head. Open the airway with head tilt–chin lift (use a jaw thrust if cervical spine injury is possible). Place the mask with the apex on the nasal bridge and the base in the chin cleft.

Left hand (dominant or non-dominant – use whichever provides better control):

• Thumb – pressed on the left side of the mask body near the top, pointing toward the patient’s nose
• Index finger – pressed on the left side of the mask body near the connector port, curled around to form the top of the “C”
• Middle finger – hooks under the mandible at the mental protuberance (chin) – first finger of the “E”
• Ring finger – hooks under the mandible, posterior to middle finger – second finger of the “E”
• Little finger – hooks under the angle of the mandible – third finger of the “E”

The E-fingers pull the jaw upward into the mask while the C-fingers press the mask down against the face. The seal comes from this opposing pressure – jaw up, mask down – not from pressing the mask hard against the face.

Right hand squeezes the bag.

Common E-C errors:

• Fingers pressing on the soft tissue under the jaw (pushes the tongue back and compresses the airway)
• Insufficient jaw thrust – mask seal requires an open airway beneath it
• Pressing the mask too hard into the face without the counterforce of the jaw lift – this flattens the mask cushion and paradoxically worsens the seal
• Using the E-fingers on the cheek instead of the mandible – provides no airway lift

Two-person BVM technique

Two-person BVM gives a better seal and larger, more consistent tidal volumes than one-person BVM. In a study of apneic, anesthetized adults, a two-handed jaw-thrust mask hold delivered larger tidal volumes than the one-handed E-C clamp and produced fewer inadequate breaths (Joffe 2010). The 2025 AHA adult BLS guideline rates it as reasonable for one rescuer to use both hands to open the airway and seal the mask while a second rescuer squeezes the bag.

When to use two-person:

• Any patient with a difficult airway (beard, obesity, facial trauma, large face)
• Prolonged ventilation before intubation
• Whenever a second provider is available – this should be the default in a code situation, not the exception

Mask holder position (operator 1):

• Both thumbs on the mask body, one on each side, angled toward the nose apex
• Both index fingers mirroring on the lower mask body, angled toward the chin
• Remaining fingers (middle, ring, little) of both hands along the lateral mandible, lifting the jaw bilaterally
• This creates a bilateral jaw thrust with symmetric mask compression – the most effective seal achievable without an advanced airway

Bag squeezer position (operator 2):

• Both hands on the bag
• Compress smoothly and steadily over 1 second for an adult; do not jam the bag
• Watch for visible chest rise – that confirms tidal volume and seal simultaneously

Communication: The bag squeezer should call each breath (“breath going in”) so the mask holder can confirm chest rise before the next compression. In a code situation with CPR, coordination prevents the bag squeezer from compressing during chest compressions (which would fight against them).

Tidal volume targets and ventilation rates

Over-ventilation is one of the most dangerous BVM errors in cardiac arrest. Every unnecessary breath delivered during CPR increases intrathoracic pressure, reduces venous return, decreases coronary perfusion pressure, and reduces the likelihood of ROSC. The instinct to ventilate aggressively must be suppressed in favor of metered, guideline-driven breaths.

Tidal volume in practice: Most adult BVM bags hold about 1,500 mL, so squeezing the full bag delivers far more than the patient needs. The 2025 AHA adult BLS guideline asks for enough volume to produce visible chest rise and cites a study in which 362–406 mL (about 5–7 mL/kg) was enough to do so. For an average adult, compress the bag roughly one-third of its volume with one hand, or use a controlled two-hand squeeze. The chest should visibly rise – not heave. If the chest heaves, the tidal volume is excessive.

Pediatric volumes: Squeeze a pediatric bag (about 500 mL) only partially, just until the chest rises, rather than with a full palm squeeze. Over-ventilation in small patients inflates the stomach rapidly, causing regurgitation within minutes. The pop-off valve provides a pressure ceiling, but it does not prevent the rapid gastric insufflation that follows repeated over-ventilation.

Airway adjuncts: OPA and NPA

A BVM mask provides oxygen delivery but does nothing to prevent airway obstruction from posterior tongue displacement. In an unconscious patient, the tongue falls against the posterior pharyngeal wall and blocks airflow. Head tilt–chin lift and jaw thrust help, and the 2025 AHA adult BLS guideline rates an oropharyngeal or nasopharyngeal airway as possibly reasonable in unconscious patients with no cough or gag reflex to make ventilation easier.

Oropharyngeal airway (OPA)

An OPA is a curved plastic or rubber device inserted into the mouth that mechanically displaces the tongue anteriorly, establishing a patent oropharyngeal channel.

Indication: Unconscious patient with no gag reflex. Never in a patient with intact gag – it will trigger vomiting and laryngospasm.

Sizing: Measure from the corner of the mouth to the angle of the mandible (some protocols use the earlobe) – the OPA tip should reach the posterior pharynx. An OPA that is too short does not displace the tongue; too long pushes the epiglottis against the posterior pharynx and worsens obstruction.

Insertion: In an adult, insert with the curved tip pointing toward the roof of the mouth (concave upward), then rotate 180° as the device passes the posterior hard palate so the curve follows the tongue anatomy. In an infant or child, do NOT rotate – insert with the curve following the tongue (concave downward) using a tongue blade to depress the tongue and guide insertion straight back. Rotation in a child risks airway trauma and dental avulsion.

After insertion: The flange should rest at the lips. The OPA does not prevent aspiration – if the patient vomits, the nurse must remove the OPA and suction immediately. Review airway suctioning for technique after OPA removal in a vomiting patient.

Nasopharyngeal airway (NPA)

An NPA is a soft rubber or latex tube inserted through the nostril that creates a patent channel from the nasal passage to the posterior pharynx, bypassing the tongue.

Indication: Patients with an intact or partially intact gag reflex who will not tolerate an OPA; trismus; jaw fracture; patients whose teeth or jaw anatomy prevents OPA insertion; ongoing seizure where oral access is impossible.

Contraindication: Suspected basilar skull fracture or severe midface trauma (raccoon eyes, Battle’s sign, hemotympanum, CSF rhinorrhea). Intracranial placement of a nasal airway through a skull-base fracture has been reported, so avoid the nasal route in these patients.

Sizing: Measure from the tip of the nose to the earlobe (or tragus). Choose the largest diameter that passes comfortably through the nostril; the traditional “little finger” rule is a rough guide only. An NPA that is too long can enter the larynx and cause laryngospasm.

Insertion: Lubricate generously with water-soluble lubricant. Insert bevel-side toward the nasal septum (bevel toward the side of insertion in some protocols). Advance along the floor of the nasal passage, not superiorly. If resistance is felt, do not force – attempt the other nostril.

Gastric insufflation and the Sellick maneuver

Gastric insufflation is a direct consequence of BVM over-ventilation. The higher the airway pressure, the more gas is forced past the esophageal sphincter into the stomach. In a randomized study of anesthetized adults ventilated by face mask, gastric insufflation heard on auscultation rose from 0% at an inspiratory pressure of 10 cm H₂O to 41% at 25 cm H₂O, and the authors recommended keeping pressure around 15 cm H₂O (Bouvet 2014). This produces four problems: gastric distension reduces diaphragm excursion and worsens ventilation; it dramatically increases regurgitation risk; if the patient vomits during BVM, aspiration is immediately life-threatening; and it falsely reassures the provider that ventilation is adequate when stomach inflation is mistaken for chest rise.

Prevention:

• Tidal volume just enough for visible chest rise – not more
• Inspiratory time ~1 second – do not rush the breath in
• Ensure adequate mask seal and open airway before squeezing (if the airway is obstructed, all pressure goes into the stomach)
• Two-person technique is protective – better seal means lower pressure required per breath
• Insert an OPA or NPA if the patient is unconscious – reduces airway resistance and required bag pressure

Cricoid pressure (Sellick maneuver): This technique involves applying posterior pressure to the cricoid cartilage to compress the esophagus against the vertebral body, theoretically preventing passive regurgitation and reducing gastric insufflation during BVM. It was standard teaching for decades.

Current evidence does not support routine use. The 2025 AHA adult BLS guideline states that routine cricoid pressure in adult cardiac arrest is not recommended: there is no evidence that it helps ventilation or prevents aspiration during arrest, and later studies found it failed to reduce aspiration and may impede advanced airway placement. The 2025 pediatric guideline likewise recommends against routine cricoid pressure during bag-mask ventilation and intubation of infants and children. Outside cardiac arrest, its use during rapid sequence intubation remains a clinical judgment for the airway team; in the IRIS trial of 3,472 anesthesia patients (Birenbaum 2019), aspiration was rare with or without it (0.6% with cricoid pressure vs 0.5% with a sham procedure), but cricoid pressure was linked to poorer laryngoscopic views and longer intubation times. That trial could not formally prove that omitting cricoid pressure is noninferior, which is why the practice is still debated. Do not expect cricoid pressure to appear as the “correct answer” on NCLEX for preventing gastric insufflation during BVM – correct tidal volume and technique are the primary answers.

BVM during CPR

Cardiac arrest changes BVM priorities. Rapid response and code blue situations require both effective ventilation and preservation of chest compression quality – these two goals are in direct tension.

Before an advanced airway is placed (30:2 ratio):

During CPR, BVM is used in a synchronized 30:2 compression-to-ventilation ratio for adult single- or two-rescuer CPR. Pause compressions for the two breaths. Each breath should be delivered over 1 second. Resume compressions immediately and keep the pause under 10 seconds. When enough staff are present, one rescuer holds the mask with both hands while a second squeezes the bag, and a third performs compressions.

For two-rescuer pediatric CPR, the ratio is 15:2 (30:2 for a single rescuer). For newborns who need compressions, the ratio is 3:1 – 90 compressions and 30 breaths per minute.

After an advanced airway is placed:

Once an endotracheal tube or supraglottic airway (LMA, King LT, i-gel) is in place and confirmed, ventilation becomes asynchronous with compressions. Compressions continue without pause while a second provider delivers 1 breath every 6 seconds (10/min) for adults, or 1 breath every 2–3 seconds (20–30/min) for infants and children. This is one of the most-tested NCLEX distinctions: the 30:2 or 15:2 ratio applies only before advanced airway placement – after placement, ventilation continues at a set rate regardless of compressions. Newborns are the exception: the 3:1 ratio continues even after intubation.

Over-ventilation risk in cardiac arrest: Each breath during CPR transiently increases intrathoracic pressure, impairs venous return, and reduces coronary perfusion. In Aufderheide’s 2004 study, paramedics ventilated arrested patients at an average of 30 breaths/min, and in pigs, rates like these lowered coronary perfusion pressure and survival. The 2025 AHA guidelines ask rescuers to avoid both hypo- and hyperventilation. On waveform capnography, an ETCO₂ below 10 mmHg is associated with poor outcomes, values above 10 mmHg (ideally above 20 mmHg) with higher ROSC rates, and an abrupt rise may signal ROSC. In intubated adults, failure to reach an ETCO₂ above 10 mmHg after 20 minutes of advanced life support is one component of a multimodal decision to stop – never a stand-alone rule, and no ETCO₂ cutoff should be used for that decision in non-intubated patients. See cardiac monitoring and telemetry for monitoring context in cardiac arrest.

PEEP valve use with BVM

A PEEP valve attaches inline between the BVM patient valve and the mask (or ET tube adapter). It is a spring-loaded or dial-adjustable device that maintains continuous positive airway pressure throughout the ventilatory cycle by creating resistance to expiratory flow.

When to use: Severe hypoxemia unresponsive to high-flow oxygen alone; suspected or confirmed ARDS; pulmonary edema; patients bridging to intubation or mechanical ventilation who require PEEP to maintain alveolar recruitment. For context on how PEEP functions in mechanical ventilation, see the mechanical ventilation nursing guide.

Settings: Typical BVM PEEP valves are adjustable from 2.5 to 20 cm H₂O. Clinical PEEP settings during bridging ventilation are usually 5–10 cm H₂O. Higher PEEP (10–15 cm H₂O) may be used with provider guidance for refractory hypoxemia.

Practical considerations: Adding a PEEP valve increases inspiratory work and bag resistance. The person squeezing the bag must apply more force to deliver the target tidal volume. Monitor for chest rise carefully. The two-person technique is strongly preferred when a PEEP valve is in use. PEEP valves also increase the risk of gastric insufflation at higher settings – airway patency and appropriate tidal volumes become even more critical.

BVM with tracheostomy or stoma

Patients with a tracheostomy or laryngectomy stoma require modified BVM technique. The principles are identical – deliver positive-pressure ventilation through the airway – but the interface changes.

Tracheostomy patients: Connect the BVM directly to the 15 mm adapter on the tracheostomy tube. This is the easiest and most reliable configuration. If the tracheostomy tube is cuffed, inflate the cuff before ventilating to prevent leak. If a cuffless or fenestrated tube is in place, BVM ventilation via the tube may produce a significant leak – close the patient’s mouth and nose with your hand while ventilating through the tube. See the tracheostomy nursing guide for detail on cuff management and tube obstruction.

Laryngectomy patients (stoma ventilation): After a total laryngectomy, there is no connection between the oropharynx and the lungs – the trachea has been surgically brought to a skin-level stoma. Applying a BVM mask to the face delivers air to a dead end.

For a laryngectomy patient in respiratory distress (based on the UK National Tracheostomy Safety Project algorithm, McGrath 2012):

1. Uncover the stoma and remove any stoma cover, heat-moisture exchanger, or blocked tube
2. Place an infant or pediatric face mask directly over the stoma (a small round mask usually seals well)
3. Or use a tracheostomy-specific adapter, or a supraglottic airway placed over the stoma, if available
4. There is no need to close the mouth and nose in a total laryngectomy, because they no longer connect to the lungs. Patients with a tracheostomy (upper airway still intact) are different: cover their mouth and nose to stop the leak.
5. Ventilate directly through the stoma at standard adult parameters

If the stoma is obstructed, suction first. Do not attempt to intubate orally in a complete laryngectomy patient – it will not succeed.

Pediatric and neonatal BVM considerations

Pediatric patients

Children differ from adults in BVM ventilation in anatomy and physiology as well as size. Key pediatric BVM distinctions:

• Higher rates: Infants and children with a pulse who need breaths receive 1 breath every 2–3 seconds (20–30/min) vs 10/min for adults (AHA 2025 pediatric BLS).
• Smaller tidal volumes: Squeeze the pediatric bag only until the chest rises, not with a full palm squeeze.
• Gastric insufflation: Gastric inflation can occur quickly and be severe in small children. Use the lowest pressure that produces chest rise, and insert an appropriately sized OPA when the patient is unconscious with no gag reflex.
• Pop-off valve: Pediatric BVMs include a pressure-limiting valve, commonly opening at about 35–45 cm H₂O depending on the manufacturer. In poor lung compliance scenarios (bronchospasm, pneumonia, meconium), the valve may limit adequate tidal delivery – it can be manually occluded by a trained provider.
• Heart rate is a key response in children: Most pediatric in-hospital and out-of-hospital arrests are precipitated by respiratory deterioration or shock (AHA 2025 PALS), so a bradycardic child often improves quickly once ventilation is effective. A rising heart rate and improving SpO₂ after BVM ventilation confirm adequacy. In pediatric patients, refer to the pediatric nursing reference for age-specific vital sign norms.

Neonatal resuscitation

Neonatal BVM ventilation follows the 2025 AHA/AAP neonatal resuscitation guideline and the Neonatal Resuscitation Program (NRP), which differ significantly from PALS and ACLS.

Preferred device: The 2025 guideline states it can be beneficial to use a T-piece resuscitator (e.g., Neopuff) instead of a self-inflating bag, particularly for preterm infants, because the T-piece delivers consistent peak inflation pressure and PEEP. T-pieces and flow-inflating bags need a compressed gas source, so a self-inflating bag should always be available as a backup. A self-inflating bag without a manometer does not allow real-time pressure monitoring.

Parameters for neonatal ventilation (AHA/AAP 2025):

• Rate: 30–60 inflations/min
• Initial peak inflation pressure: 20–30 cm H₂O, adjusted to achieve effective ventilation (higher pressures are sometimes needed; excessive pressure is harmful)
• Inflation time: 0.5–1 second
• PEEP: may be reasonable (5 cm H₂O is a common NRP starting point) if the device allows it
• Starting oxygen: 21% for infants ≥35 weeks’ gestation; 21–30% for 32–34 weeks; 30–100% for very preterm infants <32 weeks; titrate to pulse-oximetry targets
• Meconium: routine oral, nasal, or tracheal suctioning is not recommended, whether the fluid is clear or meconium-stained

Adequacy endpoint in neonates: A rising heart rate is the primary indicator of effective ventilation. If the heart rate stays below 100/min and does not rise, work through ventilation corrective steps (mask seal, airway position, suction, pressure) and consider an alternative airway such as a laryngeal mask or endotracheal tube. If the heart rate remains below 60/min after 30 seconds of ventilation that moves the chest, start chest compressions at a 3:1 ratio. For more on neonatal resuscitation contexts, see neonatal resuscitation nursing and neonatal RDS nursing.

Common nursing errors in BVM ventilation

The following errors appear on NCLEX because they represent real harm. Each error has a specific mechanism of injury.

1. Inadequate mask seal – a very common failure mode. Leaks around the mask mean the patient receives no ventilation regardless of bag compression. The bag feels like it compresses normally because it does – the air just goes around the mask instead of into the patient. Check for chest rise on every breath. If there is no visible rise, reposition the mask before compressing again.

2. Over-ventilation: excessive rate – especially in cardiac arrest. Providers under stress instinctively ventilate too fast. At rates above the recommended 10/min for an adult with an advanced airway, intrathoracic pressure rises, venous return falls, and coronary perfusion pressure drops. Use a visible clock or count aloud.

3. Over-ventilation: excessive volume – squeezing the bag fully in an adult or using an adult bag on a pediatric patient. Chest should rise visibly, not heave. If you can see the abdomen rising, the stomach is being inflated.

4. Wrong oxygen flow rate – setting O₂ at 2–6 L/min (nasal cannula rates) when the BVM requires 10–15 L/min. At low flow rates, the reservoir cannot fill between compressions and FiO₂ drops toward 40–50% – inadequate for most emergencies.

5. Failure to assess chest rise – compressing the bag and watching the monitor instead of watching the chest. Chest rise is the primary confirmatory sign for every breath. Waveform capnography and SpO₂ are secondary.

6. Not suctioning before BVM in secretion-loaded patient – applying BVM over a mouth full of vomitus, blood, or secretions forces material into the lungs. Suction first using the airway suctioning technique – even 15 seconds of suctioning is worthwhile before initiating ventilation.

7. Failing to insert OPA in unconscious patient without gag reflex – ventilating against posterior tongue obstruction without an adjunct requires higher bag pressures, which accelerates gastric insufflation. An OPA dramatically reduces airway resistance in these patients.

8. Cricoid pressure disrupting intubation – if a provider applies cricoid pressure during intubation and the laryngoscopist cannot visualize the cords, release the cricoid pressure immediately rather than maintaining a practice with equivocal evidence.

9. Wrong mask size – using a mask that covers the eyes (too large) breaks the apical seal and causes eye pressure injury. Using a mask too small creates a perimeter gap at the chin. Always confirm fit before ventilating.

10. Forgetting to confirm tube position after intubation – BVM is often used until intubation. After tube placement, immediately confirm position with continuous waveform capnography (the most reliable method, per AHA 2025) plus bilateral breath sounds and chest rise. An unrecognized esophageal intubation can be fatal within minutes.

NCLEX high-yield tips

These are the BVM ventilation concepts most consistently tested on NCLEX. Each tip represents an area where the plausible-sounding wrong answer is the one most students select.

1. Adult BVM rate is 1 breath every 6 seconds (10/min). 20–30/min is the pediatric rate and 30:2 is the CPR ratio; 10/min applies to an adult in respiratory arrest who still has a pulse.

2. Pediatric/infant BVM rate is 20–30 breaths/min (1 breath every 2–3 seconds). Higher rate reflects higher physiologic respiratory rates in children. The 2020 AHA update raised this from the older 12–20/min figure and the 2025 guidelines retain it – older study guides are stale. The question may ask you to differentiate adult from pediatric rates – know both.

3. Newborn ventilation rate is 30–60 inflations/min. The 2025 AHA/AAP neonatal guideline widened this from the older 40–60/min figure, so check which edition a study guide follows.

4. E-C clamp: E = three fingers on jaw (lift), C = thumb + index finger on mask (press). Questions will describe the hand position and ask you to identify the technique, or describe an error (E-fingers on cheek = wrong).

5. Two-person BVM is superior to one-person. The mask holder uses both hands for bilateral jaw lift and mask seal – far better seal than one-person. Select two-person whenever two providers are available.

6. Signs of effective BVM ventilation: bilateral chest rise, improving SpO₂, a rising heart rate in infants and children. A capnography waveform with every breath shows that gas is reaching the lungs; during CPR, an ETCO₂ below 10 mmHg suggests compressions need improving. Stomach rising is not a sign of adequate ventilation – it indicates gastric insufflation.

7. Gastric insufflation prevention: correct tidal volume + correct rate + patent airway. The NCLEX answer for preventing gastric insufflation is ensuring the airway is open (head-tilt chin-lift, OPA if appropriate), giving only enough volume for visible chest rise, and not over-ventilating. Cricoid pressure is NOT the NCLEX-primary answer.

8. The adult CPR 30:2 ratio is for before advanced airway placement. Once an ET tube or supraglottic airway is confirmed, switch to continuous compressions plus 1 breath every 6 seconds (10/min) asynchronously. This is heavily tested.

9. After advanced airway: 1 breath every 6 seconds (10/min) for adults, 1 every 2–3 seconds (20–30/min) for children, asynchronous. Compressions do not stop for breaths. This is the opposite of the 30:2 rule and students frequently mix them up.

10. Reservoir bag must be attached and oxygen running at 10–15 L/min to achieve ~90–95% FiO₂. Without the reservoir, FiO₂ is only 40–60% even at 10–15 L/min oxygen flow. Without oxygen flow at all, the patient breathes room air (21%).

11. OPA sizing: corner of mouth to angle of jaw (some protocols use the earlobe). Too short = doesn’t displace tongue. Too long = pushes epiglottis into pharynx. OPA is contraindicated in patients with intact gag reflex.

12. OPA insertion in adults: rotate 180°. In children: do NOT rotate – use tongue blade. Rotation in a child risks injury. This distinction is frequently tested.

13. NPA contraindicated in suspected basilar skull fracture. Raccoon eyes, Battle’s sign, hemotympanum, and CSF rhinorrhea are the clinical signs. Any of these = no NPA.

14. NPA sizing: tip of nose to earlobe. Diameter approximates the nares. Too long risks laryngospasm.

15. Pop-off valve on pediatric BVMs commonly opens at about 35–45 cm H₂O (check the device). It can be manually occluded in poor-compliance situations by a trained provider. Its purpose is prevention of barotrauma, not tidal volume delivery.

16. PEEP valve increases resistance – two-person BVM preferred when PEEP is used. Adding PEEP improves oxygenation in ARDS and pulmonary edema but increases the force needed to deliver each breath.

17. Laryngectomy patients: apply BVM to stoma, not the face. After a total laryngectomy the stoma is the only airway and the face is a dead end, so there is no need to occlude the mouth and nose. Use an infant or pediatric mask over the stoma.

18. Neonatal resuscitation: a rising heart rate is the primary indicator of effective ventilation. If it does not rise, work through ventilation corrective steps before escalating; start compressions if HR stays below 60/min after 30 seconds of ventilation that moves the chest.

19. The T-piece resuscitator is the preferred neonatal device where available. A self-inflating bag is acceptable and must be on hand as a backup. The 2025 AHA/AAP guideline favors the T-piece because it delivers consistent PIP and PEEP, especially for preterm infants.

20. Over-ventilation during CPR worsens outcomes. AHA guidelines ask rescuers to avoid hyperventilation during resuscitation. Every unnecessary breath raises intrathoracic pressure, reduces venous return, and lowers coronary perfusion pressure.

NCLEX practice questions

Related skills

BVM ventilation does not exist in isolation – it is one technique within a broader respiratory and resuscitation skill set. The oxygen therapy nursing guide covers the full range of oxygen delivery devices from nasal cannula to non-rebreather mask, providing context for how BVM fits into the oxygen delivery spectrum. When a patient deteriorates beyond BVM capacity, the mechanical ventilation nursing guide covers how positive-pressure ventilation is continued with a ventilator. Understanding airway management is inseparable from airway suctioning, particularly suctioning before BVM application and suctioning via OPA during ongoing ventilation. Patients who require BVM most urgently are those in cardiac arrest or rapid response situations – those guides provide the full clinical picture of which BVM decisions occur in which phases of resuscitation. For patients with a surgical airway, the tracheostomy nursing guide covers modified BVM interfaces, cuff management, and stoma ventilation in detail. Pediatric-specific BVM decisions connect to pediatric nursing reference parameters, and neonatal BVM care is further addressed in neonatal resuscitation nursing.

References

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