Small Patients, Specific Protocols: Implementing the RECOVER Newborn Resuscitation Guidelines

The transition from the womb to the outside world is arguably the most dangerous journey any veterinary patient will ever take. In a matter of seconds, a newborn must shift from total placental dependence to independent pulmonary gas exchange. While many puppies and kittens navigate this transition seamlessly, the stakes are exceptionally high when they do not. Neonatal mortality increases significantly with dystocia and emergency cesarean delivery.^1-3

For years, veterinary teams relied on a mix of anecdotal evidence, “old school” traditions, and adaptations of adult cardiopulmonary resuscitation (CPR) protocols. However, newborns are not small adults; their physiology is unique, and their reasons for arrest are almost always respiratory rather than primary cardiac failure. Recognizing this gap, the Reassessment Campaign on Veterinary Resuscitation (RECOVER) Initiative has released the Newborn Resuscitation Guidelines to provide a standardized, evidence-based framework designed specifically for these first minutes.^4-6

The Newborn Transition

Newborn puppies and kittens must rapidly transition from placental oxygen delivery to independent pulmonary gas exchange. As the newborn takes its first breaths, the lungs expand, dropping pulmonary resistance and signaling the fetal circulatory shunts (specifically the foramen ovale and ductus arteriosus) to close. If this lung aeration fails, the physical transition halts, leading to profound hypoxia and secondary bradycardia.

The Primary Driver: Hypoxia and Lung Aeration

In adult veterinary patients, cardiac arrest typically involves a failure of the cardiovascular system. By the time the heart stops, the pump has failed, which is why the adult RECOVER guidelines prioritize immediate chest compressions to artificially generate blood flow. However, newborns in distress are not experiencing a heart attack or systemic collapse; they are failing a physiologic transition. Their heart is perfectly healthy, simply waiting for the lungs to provide oxygen. Therefore, newborn resuscitation does not start with chest compressions. With successful aeration of the lungs and reversal of the hypoxia, the newborn’s heart has a good chance to recover on its own.

When the transition from the placenta fails, the newborn enters a cycle⁶:

• Primary apnea: This is the initial response to oxygen deprivation. The newborn stops breathing, but the cardiovascular system is still compensating; therefore, the heart rate remains normal or only slightly decreased. Because the brain’s respiratory center is still responsive to sensory input, vigorous drying or rubbing of the thorax is highly effective. This tactile stimulation sends signals to the central nervous system, often triggering a reflex gasp that restarts the respiratory drive.
• Secondary (terminal) apnea: If hypoxia continues, compensatory mechanisms fail. Breathing stops completely, and oxygen deprivation directly impacts the heart muscle, causing a precipitous drop in heart rate (severe bradycardia). The critical clinical takeaway is that a patient in secondary apnea is neurologically unresponsive to touch. Continuing to rub or stimulate wastes precious time. The only effective intervention is immediate positive pressure ventilation (PPV) to force oxygen into the lungs, reversing the hypoxia so the heart can recover.

The RECOVER Newborn Resuscitation Guidelines have formally retired the practice of “swinging” (centrifugation) to force fetal lung fluid out of the bronchioles. Swinging creates a high risk of intracranial hemorrhage caused by acceleration–deceleration forces, as well as the risk of inducing aspiration of stomach contents, and is now strictly contraindicated.

Definitions Matter: Newborn Versus Neonate

For the purposes of these guidelines and practices’ clinical protocols, it is important to distinguish the stages of early life:

• Newborn specifically refers to the patient during the immediate transition period (the first minutes to hours after birth). This is the window where the RECOVER Newborn Resuscitation Algorithm is applicable (FIGURE 1).
• Neonate refers to the patient from birth until weaning (typically 3 to 4 weeks of age). While neonates still require specialized care, their resuscitation after the initial transition period begins to align more closely with standard pediatric or adult protocols.

Focusing on the newborn phase targets the precise moment when intervention in a failing transition can support the patient’s first successful shift to independent breathing.

Figure 1. The RECOVER Newborn Resuscitation Algorithm for Dogs and Cats. Courtesy RECOVER.

CPR = cardiopulmonary resuscitation
C:V = compression-to-ventilation ratio
GV = governing vessel
PPV = positive pressure ventilation
RECOVER = Reassessment Campaign on Veterinary Resuscitation
RR = respiratory rate

Preparation: The Prebrief

In emergency medicine, success is determined before the patient presents. For newborn resuscitation, this is especially true. Whether the situation is an expected dystocia, a planned cesarean delivery, or a surprise presentation in the emergency room, the first minute of life leaves no time for gathering supplies or debating roles.

Implementing the RECOVER newborn guidelines begins with “just-in-time” training and prebriefing. The algorithm should be accessible as a cognitive aid in the surgery suite or whelping area. Before the first puppy or kitten is delivered, the team should huddle to assign roles (BOX 1). Who is the team leader? Who is receiving the newborns? Who is responsible for monitoring the heart rate?

Equally critical is the establishment of a dedicated resuscitation station where the RECOVER newborn algorithm and precalculated neonatal drug chart (FIGURE 2) are prominently displayed or accessible. A properly stocked station prevents frantic scrambling that can delay critical interventions (BOX 2).

Figure 2. The Newborn Resuscitation Dosing Chart. Courtesy RECOVER.

By preparing the environment and the team ahead of time, veterinary nurses can ensure that when a depressed newborn is handed to them, every second of the first minute is spent actively reversing hypoxia rather than searching for equipment.

Assessment: Heart Rate as the Driving Vital Sign

If tactile stimulation, warming, and airway clearance do not yield a vigorous, crying newborn, the team must immediately transition from basic supportive care to clinical assessment. In the newborn, the single most important vital sign and the primary driver for all subsequent interventions is the heart rate.

Because hypoxia quickly leads to bradycardia in the perinatal period, the heart rate serves as an indirect but highly reliable measure of oxygenation. In the RECOVER algorithm, the critical threshold is 120 beats per minute (bpm). A heart rate above 120 bpm generally indicates that the newborn is adequately compensating. A heart rate below 120 bpm despite initial stimulation and airway clearance is a red flag that the patient is suffering from asphyxial injury and requires immediate escalation of care.

How to Measure Heart Rate

Obtaining an accurate heart rate in a newborn requires the right approach.

• Auscultation and palpation: Auscultation with a pediatric stethoscope or direct palpation of the apex beat through the chest wall are the simplest and most accessible methods.
• Doppler ultrasonography: For patients requiring attention, placing a Doppler ultrasonography probe directly over the heart is highly effective as it creates a “shared mental model” for the room, gives the person providing ventilation instant feedback on whether their breaths are effective, and provides the team leader real-time insight.

While electrocardiography is considered the most accurate monitoring tool, securing leads on a tiny newborn is often clinically impractical.

Notably, the RECOVER guidelines issue a strong recommendation against relying on pulse oximetry during this phase. Pulse oximeters are notoriously inaccurate in newborn puppies and kittens due to poor peripheral perfusion, and waiting for a reliable reading will delay lifesaving interventions.⁶

The Role of Apgar Scoring

Apgar scores can be a helpful tool to monitor trends in a vigorous or recovering newborn.7 They are based on assessments of 5 health parameters at 5, 30, and 60 minutes of life (TABLE 1).⁷ However, they are not a triage tool for initial resuscitation. If a newborn is nonvigorous at birth, do not pause to calculate an Apgar score. Apgar scores should be considered during the postresuscitation phase; their proper use will, therefore, be discussed in further detail later in this article.

Respiratory Support: The Priority of Ventilation

In the newborn, profound bradycardia is almost entirely driven by a lack of oxygen. If the lungs are successfully aerated, the heart almost always recovers on its own. Therefore, PPV is the primary lifesaving tool.

When to Initiate Positive Pressure Ventilation

The decision to start PPV is straightforward. It should be initiated immediately if the newborn is apneic or gasping or if the heart rate is below the critical threshold of 120 bpm despite initial drying and tactile stimulation. A common pitfall is spending too much time rubbing a nonresponsive patient. Do not wait for a full minute to pass before reaching for the mask; the goal of the RECOVER algorithm is to accomplish stimulation, assessment, and the initiation of PPV all within the first 60 seconds of life if the patient needs it.

The Tight-Fitting Mask

In adult CPR, securing the airway with an endotracheal tube is a top priority, second only to starting compressions. In newborns, attempting early intubation is a common pitfall. The neonatal airway is small, and standard endotracheal tubes rarely fit. Searching for workarounds wastes critical time while the hypoxia worsens.

Instead, the guidelines strongly recommend starting PPV with a tight-fitting face mask. Because newborns come in vastly different shapes and sizes (an Irish wolfhound neonate requires very different equipment than a Chihuahua), having a variety of mask sizes readily available at the resuscitation station is vital to achieving the right seal quickly (FIGURE 3).

Figure 3. Proper placement of tight-fitting face mask for positive pressure ventilation in a newborn. Courtesy RECOVER.

Dialing in the Pressure

When providing PPV, the goal is to mechanically force open alveoli that have never been expanded and are still filled with fetal lung fluid. Because of this, the required pressures are often higher than those typically used for healthy, anesthetized adult patients. When using an anesthesia circuit or a T-piece resuscitator, target the following parameters.⁶

• Peak inspiratory pressure: 20 to 25 cm H2O
• Positive end-expiratory pressure (PEEP): If equipment allows, applying a PEEP of 4 to 8 cm H2O is beneficial for keeping freshly opened alveoli from collapsing between breaths.
• Rate and time: Deliver 20 to 30 breaths per minute, utilizing a short, brisk inspiratory time of approximately 1 second.

Start With Room Air

One of the most significant paradigm shifts in the RECOVER newborn guidelines is the recommendation regarding oxygen concentration. In emergency veterinary medicine, the instinct is to immediately reach for 100% oxygen when a patient is in distress.

However, for a newborn that has been in a prolonged hypoxic state, suddenly flooding the system with 100% oxygen can cause severe oxidative stress and exacerbate ischemia-reperfusion injury to the brain.⁸ The guidelines suggest initiating PPV with room air (21% oxygen). Mechanical expansion of the lungs and delivery of baseline environmental oxygen should trigger the vasodilation needed to transition the circulation. Escalating to 100% supplemental oxygen is recommended if the newborn fails to respond to effective mask ventilation, indicated by a persistently low heart rate, ongoing cyanosis, or lack of spontaneous breathing.

When to Intubate

If the heart rate still fails to climb above 120 bpm during effective PPV via a mask, it is time to escalate. At this point, intubation should be attempted. Because standard tubes are usually too large, the nursing team must be resourceful. Utilizing large-bore intravenous catheters (e.g., 14- or 16-gauge) attached to an airway adapter, sometimes guided by a small speculum, is often the most effective method for securing these undersized airways. Once the airway is secure, switch to 100% oxygen and continue ventilation while continuously monitoring the heart rate.

Cardiopulmonary Resuscitation: When Positive Pressure Ventilation Is Not Enough

Despite the team’s best efforts with warming, stimulation, and ventilation, some newborns fail to respond. If the heart rate drops below 50 bpm or if there is no heartbeat detected at birth, the patient is in critical circulatory failure, and CPR must be initiated immediately. This represents a distinct escalation from standard newborn resuscitation into full CPR.

In adult veterinary patients, chest compressions are typically not indicated for a patient that still has a pulse. Newborns are physiologically different. Because their heart muscle is immature and stiff, they have a fixed stroke volume; they cannot squeeze harder to compensate for a slowing heart.⁸ Their cardiac output is entirely dependent on their heart rate. Therefore, a heart rate below 50 bpm indicates that cardiac output has plummeted and full arrest is imminent. Waiting for the heart to stop completely before starting compressions is a fatal mistake.

Chest Compressions: Technique and Mechanics

The physical mechanics of neonatal CPR require a delicate but effective touch (FIGURE 4). Because newborns have highly compliant chests and a small heart, the 2-handed technique used in adults is strictly contraindicated.

• Positioning: For most newborns, compressions should be performed in lateral recumbency (laterolateral). Use a 1- to 2-finger technique (index, with or without middle, finger over the heart) or a “pinch” technique, wrapping the thumb and index finger around the thorax.
• Depth: Compress the chest by one-third to one-half of its width, allowing for full elastic recoil between compressions.

The ventrodorsal exception: If the team needs to access the umbilical vein for drug administration, the newborn can be placed in dorsal recumbency. Compressions are performed ventrodorsally over the sternum. However, the depth should be slightly shallower (closer to one-third the depth of the chest) to avoid trauma caused by compressing against the spine and epaxial muscles.⁶

Figure 4A. Chest compression techniques for newborns. The 1- or 2-finger technique involves using the index finger or the index and middle fingers to compress the chest over the heart while the patient is in lateral recumbency. Courtesy RECOVER.

Figure 4B. Chest compression techniques for newborns. The “pinch” technique is performed by wrapping the thumb and index finger around the thorax to deliver compressions. Courtesy RECOVER.

Figure 4C. Chest compression techniques for newborns. When dorsal recumbency is required for umbilical vein access, compressions are performed ventrodorsally over the sternum, with the depth slightly shallower to avoid trauma. Courtesy RECOVER.

The 4:1 Ratio

Because a cuffed endotracheal tube is rarely in place to seal the airway in newborns, continuous compressions cannot be performed simultaneously with ventilation. Instead, the newborn guidelines recommend a 4:1 compression-to-ventilation ratio.

The target is 150 “events” per minute, which breaks down to 120 compressions and 30 breaths per minute.6 The team leader or timekeeper should set a metronome to 150 bpm. The rhythm should be executed as a coordinated cycle: compression, compression, compression, compression, breath.

Pause compressions for a brief second to deliver the breath and watch for chest rise, then immediately resume the next set of 4 compressions.

The 2-Minute Cycle: Do Not Stop

Once this 4:1 rhythm begins, it must be maintained uninterrupted for a full 2 minutes. Every time compressions are stopped, the artificial perfusion pressure built up in the cardiovascular system instantly plummets to zero. It takes several continuous compressions just to rebuild pressure to a level that effectively forces blood to the brain and heart muscle; therefore, the team should not stop to check the heart rate midcycle.

At the end of 2 minutes, the timekeeper announces the end of the cycle, and the team pauses for no more than 10 seconds to evaluate the heart rate (ideally via audible Doppler ultrasonography) and check for spontaneous respiratory effort.⁶ If the heart rate remains below 50 bpm or is absent, immediately resume the next 2-minute cycle.

Pharmacology: Use With Intention

In adult patients, advanced life support emphasizes several drugs as interventions. In newborn CPR, pharmacology plays a much more minor role, and interventions are highly specific.

• Epinephrine: If there is no response after at least 2 full minutes of effective ventilation and chest compressions, epinephrine may be administered at a dose of 0.01 to 0.03 mg/kg. Intravenous or intraosseous routes are highly preferred, with the umbilical vein often being the most accessible route in a freshly delivered neonate.
• Reversal agents: If the dam was given sedative analgesics (such as opioids or benzodiazepines) prior to a cesarean delivery or during dystocia, administering the appropriate reversal agent (naloxone or flumazenil) to the newborn is strongly recommended to remove any chemical respiratory depression.
• Atropine: Unlike adult vagally mediated bradycardia, newborn bradycardia is almost exclusively caused by myocardial hypoxia. Administering atropine simply forces a starved heart to work harder without fixing the lack of oxygen. It is generally discouraged unless primary vagally mediated bradycardia is suspected.
• Doxapram: Historically considered a “go-to” respiratory stimulant, doxapram is now highly controversial. It works by stimulating the brain’s respiratory center, which increases cerebral oxygen demand. Giving doxapram to a cyanotic, hypoxic newborn can actively worsen hypoxic-ischemic brain injury. It should only be considered as an adjunctive measure in a pink, well-oxygenated newborn that is simply bradypneic.⁸

Beyond the First Hour: Transitioning to Standard Basic Life Support

These specific protocols, including the 4:1 ratio and the use of room air, are optimized exclusively for the initial transition from fetal to postnatal life.

Once a newborn has successfully transitioned and stabilized (typically within the first hour of life), any subsequent cardiopulmonary arrest should be managed using the standard RECOVER Basic and Advanced Life Support Guidelines.^9,10

At this stage, the lungs are aerated and the fetal shunts have likely closed, meaning the patient now requires 100% oxygen and continuous chest compressions to maximize the chances of a successful resuscitation.

Postresuscitation Care and Monitoring

Successfully restoring a heart rate above 120 bpm and establishing spontaneous breathing marks the end of the acute resuscitation phase, but it is only the beginning of the neonatal transition. Newborns that required intervention are at a high risk for secondary decompensation, hypothermia, and hypoglycemia. The nursing focus must now shift from rapid lifesaving interventions to meticulous critical care.

The Proper Time for Apgar Scoring

As mentioned, the adapted Apgar scoring system is not a triage tool for the initial resuscitation, but it is an exceptional monitoring tool for the postresuscitation phase.⁷ The team should formally assess and record the Apgar score at 5, 30, and 60 minutes of life. A rising Apgar score over that first hour indicates a successful transition. A stagnant or dropping score alerts the nursing team that the newborn is fatiguing and may require further intervention, such as supplemental oxygen or restarting PPV (BOX 3).

Aggressive Thermoregulation

Hypothermia is the enemy of the neonate. As the newborn is stabilized, they must be moved to a controlled, warm environment, such as a dedicated pediatric incubator or a heavily padded area with a radiant heat source. The target core temperature for the first week of life is 35 °C to 37.2 °C (95 °F to 99 °F). Veterinary nurses must be vigilant to avoid iatrogenic thermal burns; never place a newborn directly on a heating pad or hot water bottle without ample, thick bedding between the heat source and the patient.

Umbilical Care

Once the patient is stable, the umbilicus should be properly managed to prevent ascending infection and sepsis. Ligate the umbilical cord approximately 1 to 2 cm from the body wall using absorbable suture material. Afterward, dip the stump in a dilute antiseptic solution, such as 0.5% chlorhexidine or dilute povidone-iodine.

Defending Against Hypoglycemia

Newborns possess minimal hepatic glycogen stores and rely almost entirely on exogenous nutrition to maintain blood glucose. The physical stress of a prolonged or difficult delivery, combined with the metabolic toll of hypoxia and resuscitation, rapidly depletes whatever minor reserves they have.

Because these patients can slide into a crisis in minutes, monitoring blood glucose is essential if they are not suckling. A simple blood sample can be obtained via a marginal ear vein or a paw pad prick using a small-gauge needle or sterile lancet.

According to the RECOVER guidelines, the threshold for intervention is a blood glucose below 60 mg/dL.

• The first-line goal: If the dam is stable and awake and maternal instincts are present, encourage nursing as soon as possible. Early nursing provides both glucose and lifesaving colostrum for passive immunity.
• For stable, warm neonates: If the dam is unavailable but the patient has a strong sucking reflex, the priority is immediate tube-feeding of colostrum or a commercial milk replacer.
• For weak or symptomatic neonates: If the patient is lethargic or has a poor sucking reflex, the nursing team must act quickly. While preparing for systemic access, a small amount of 50% dextrose at 0.5 g/kg can be applied directly to the buccal mucosa for rapid absorption.
• For severe cases: If intravenous or intraosseous access is available, a slow bolus of 12.5% dextrose at
  0.25 g/kg should be administered.

Summary

The release of the RECOVER newborn guidelines marks a pivotal moment for the veterinary nursing profession, providing an evidence-based roadmap that prioritizes the most critical physiological need of the newborn: the transition from placenta to lungs. By recognizing the resiliency of the neonatal heart, the dangers of oxidative stress from 100% oxygen, and the vital importance of the first minute, the nursing team can move with a level of precision and confidence.

The success of these cases starts with a prebrief, a well-stocked station, and a team that speaks the same language of heart rates and lung aeration. Veterinary nurses are the primary guardians of the “first minute.” Through diligent application of the RECOVER guidelines, every puppy and kitten is given the best possible chance at a healthy, vibrant life.