The focus is the mother, full stop. In a pregnant patient at 22 weeks whose fetus is already known to be previable, cardiopulmonary resuscitation concentrates on high-quality chest compressions, airway and ventilation, and left uterine displacement — with no peri-mortem cesarean delivery for fetal indication, because a 22-week fetus cannot survive ex utero and the gravid uterus at this size does not yet cause the aortocaval compression that drives delivery decisions later in pregnancy. The one exception is maternal decompensation from a mechanical cause the uterus is creating.
That boundary is where most bedside confusion starts. Resuscitation teams trained on third-trimester emergencies reach for the perimortem cesarean threshold before checking gestational age. At 22 weeks the calculus flips: the uterus is roughly at or just above the umbilicus and still small enough that relieving compression through positioning usually works. The evidence base for this exact scenario is thin and largely extrapolated from later-pregnancy data and simulation studies, so this article separates what guidelines state from what is inference. It is general education for clinicians and trained responders, not a substitute for local protocol or the direction of a qualified obstetric and resuscitation team.
Why Maternal Survival Is the Entire Objective at 22 Weeks
The first decision in this resuscitation is who the patient is. Once a fetus is known to be at 22 weeks, the answer is the pregnant person alone, and every intervention gets weighed against maternal return of spontaneous circulation. The American Heart Association's cardiac arrest guidance and the obstetric emergency frameworks built on it treat maternal resuscitation as the priority in all pregnancies; the fetal-viability question only modifies the delivery decision, never the compression and ventilation standards.
Twenty-two weeks sits below every recognized threshold for neonatal survival used in resuscitation planning. Even the most aggressive neonatal intensive care units that report survival at the edge of viability — the 22-to-23-week cohort described in the Neonatal Research Network's extremely preterm birth follow-up work — do so for live-born infants with antenatal steroid exposure, a planned delivery, and immediate neonatal teams, none of which exist in a cardiac arrest. A fetus delivered during maternal arrest at this age is not a resuscitation target.
That single fact changes what the team focuses on minute by minute. No one should be assigned to prepare for delivery, no one should be timing a perimortem cesarean clock, and no one should be weighing neonatal survival statistics at the bedside. The focus narrows to compression quality, early defibrillation when the rhythm is shockable, reversible-cause reversal, and the positioning and medication adjustments pregnancy requires.
There is a second, less obvious reason maternal focus matters here: a 22-week uterus rarely produces the inferior vena cava compression that makes late-pregnancy arrest so precarious. Cardiac output can be maintained in the supine position better than at 34 weeks, which means the resuscitation team is not fighting the mechanical disadvantage that dominates third-trimester cases. The mother's physiology is closer to a non-pregnant arrest than the team may expect.
What Actually Causes Arrest in Pregnancy and What Changes the Reversible-Cause Search
Pregnancy shifts the differential for reversible causes, and that shift is where the focus should sit after the basics. The AHA's reversible-cause mnemonic is unchanged, but the pregnancy-specific entries deserve early attention: hemorrhage, hypertensive disorders including eclampsia, sepsis, amniotic fluid embolism, and pulmonary embolism. At 22 weeks, hemorrhage from placental abruption or uterine rupture is possible but less common than later; pulmonary embolism and sepsis rise in relative importance.
Amniotic fluid embolism is the outlier that deserves naming because its presentation is distinct and its mortality historically reported above 60 percent in registry series, with many survivors left with neurological injury. It tends to strike during labor, delivery, or immediately postpartum, so at 22 weeks it is uncommon but not impossible in the setting of pregnancy loss or uterine instrumentation. Recognizing it changes nothing about compressions but does direct the team toward aggressive hemodynamic and coagulopathy support.
The mechanical reversible causes deserve scrutiny at this gestational age. Tension pneumothorax, cardiac tamponade, and massive pulmonary embolism all occur in pregnancy, and all are treated identically to the non-pregnant patient. The one genuinely pregnancy-specific structural cause worth flagging is aortocaval compression — which at 22 weeks is usually manageable with positioning rather than surgery, unlike the third trimester.
Point-of-care ultrasound during arrest pauses compressions, and the standard teaching is to keep those pauses under 10 seconds. That rule applies here without modification. The temptation to scan for fetal heart tones is one of the most common errors in obstetric arrest response: fetal heart tone checks consume compression time, deliver no actionable information, and at 22 weeks cannot change management.
Left Uterine Displacement: The Positioning Step That Still Applies
Left uterine displacement remains a core maneuver at 22 weeks, even though the uterus is smaller. The AHA recommends manual left uterine displacement — two-handed, from the patient's left side, lifting and shifting the uterus toward the patient's left — as the preferred technique during chest compressions in pregnancy, because it can be performed without interrupting compressions and without the tilt that degrades compression quality. The older left-lateral tilt approach has fallen out of favor because it reduces the force generated on the sternum.
The manual technique matters more than people expect. A two-handed lift displaces the uterus enough to relieve pressure on the inferior vena cava and aorta in most patients, and the person performing it kneels or stands on the patient's left at roughly the level of the hip. The hand position is beneath the uterus, palms up, lifting toward the ceiling and the patient's left. It is a sustained hold, not a shove, and it must continue through the entire compression cycle.
At 22 weeks, the displacement is easier and the benefit may be smaller in absolute terms, but the maneuver costs nothing and does not interrupt compressions. Teams should perform it. The failure mode to watch for is a responder who abandons displacement once the uterus feels "small" and then the patient's blood pressure fails to respond to otherwise adequate compressions — the compression depth is fine, the preload is not.
Manual displacement has a practical staffing implication often missed in drills: it occupies one responder continuously. In a two-responder arrest, the second responder is doing compressions and the airway is unmanaged. The realistic configuration for a pregnant arrest is four responders at minimum — compressor, airway, manual displacement, and a team lead managing rhythm and cause — and that number should appear in local obstetric arrest plans before an event occurs.
Compression Quality Is Not Modified by Pregnancy at 22 Weeks
The compression standard does not change because the patient is pregnant at 22 weeks. Rate stays at 100 to 120 per minute, depth at 5 to 6 centimeters for an adult, full recoil between compressions, and a compression fraction above 60 percent with pauses under 10 seconds. The 2020 AHA guidelines and their 2023 focused update on adult life support keep these numbers identical for pregnant patients; the obstetric modifications sit around the compressions, not in them.
The mattress is the quiet killer. A patient in a labor bed or obstetrics stretcher is often on a soft surface that absorbs compression force, and the standard fix — a backboard — should be placed before or immediately on arrest recognition if the patient is in bed. Moving the patient to a hard surface or floor is sometimes faster than finding a board, and the decision is a judgment call the team lead makes in the first 30 seconds.
There is a common misconception that pregnancy requires shallower compressions or a different hand position because of the uterus. Neither is true. Hand position is the lower half of the sternum in all adult patients, and the uterus at 22 weeks does not encroach on the thorax. The only compression adjustment pregnancy occasionally prompts is a slight upward shift if fundal height is very high, which is not the case here.
Compression quality monitoring should stay on if it's available. End-tidal CO2 above 10 mmHg suggests reasonable output, and a sudden rise can signal return of spontaneous circulation. Defibrillation follows standard energy protocols, and pregnancy is not a contraindication to shocks. The one nuance worth internalizing: if the patient is in a left lateral position when arrest is recognized, move her supine immediately and begin compressions — do not delay for monitoring or fetal assessment.
The Perimortem Cesarean Question: Why 22 Weeks Sits Below the Threshold
The perimortem cesarean decision dominates discussion of maternal arrest, and the gestational age is the pivot. The classic teaching is delivery within 4 to 5 minutes of arrest when the uterus is at or above the umbilicus, which corresponds roughly to 20 weeks, but that threshold was written for the purposes of improving maternal hemodynamics by relieving aortocaval compression — not for fetal rescue. Contemporary obstetric emergency guidance from the American College of Obstetricians and Gynecologists frames perimortem delivery as a maternal intervention first.
At 22 weeks, the uterus is at or just above the umbilicus, so the anatomical threshold is technically met. The maternal benefit, however, is small because a 22-week uterus is unlikely to be causing significant aortocaval compression, and manual displacement plus supine positioning usually restores venous return. The intervention carries real maternal risk — major abdominal surgery during an active arrest, hemorrhage, and delayed chest compressions during the procedure. In a patient whose arrest is progressing well with standard resuscitation, the risk-benefit tilts against surgery for maternal indication.
The fetal indication is zero. A 22-week fetus delivered by cesarean during maternal arrest will not survive, and the literature on perimortem cesarean outcomes includes essentially no survivors below 23 to 24 weeks. The ACOG committee opinion on perimortem cesarean delivery acknowledges that neonatal survival is extremely rare before 23 weeks and that the procedure's rationale in that range is maternal. Some centers' protocols set the fetal-benefit threshold at 24 weeks or later, reflecting local neonatal capabilities.
The practical failure case to plan for is a team that applies a generic "4-minute rule" without gestational age and starts cesarean preparation at 22 weeks, pulling two responders out of the compression cycle to scrub. That scenario is more dangerous than the one it's trying to solve. The team lead's job is to state gestational age out loud in the first minute and explicitly close the perimortem cesarean pathway unless maternal decompensation points to the uterus as the cause.
Medications, Airway, and Defibrillation in the Pregnant Arrest
Medication dosing in pregnancy arrest follows standard adult doses. Epinephrine 1 mg every 3 to 5 minutes, amiodarone per the shock-refractory algorithm, and lidocaine as an alternative are all given at non-pregnant doses. There is no pregnancy-specific adjustment for the arrest medications, and the older caution about reduced dose in pregnancy is not supported by the guidelines. The one medication category that changes is thrombolysis: pregnancy is a relative contraindication to thrombolytics in some protocols because of bleeding risk, but in a massive pulmonary embolism causing arrest, many centers still administer with obstetric involvement.
Airway management deserves specific attention because pregnancy alters the anatomy. Airway edema, increased breast tissue, and mucosal engorgement make intubation more difficult, and the incidence of failed intubation is higher in obstetric patients than in general surgical patients. The AHA recommends the same airway sequence as any adult arrest — bag-mask ventilation first, supraglottic airway or endotracheal tube as available, capnography to confirm placement. The optimal approach is early involvement of the most skilled airway operator available.
The traditional teaching to avoid cricoid pressure has softened; current guidance permits it if the operator is trained and the aspiration risk is high, but it should be released if it impairs ventilation or intubation. First-pass success matters here: each failed attempt is time off the chest. Video laryngoscopy is preferable when available and when the operator is proficient with it.
Defibrillation follows standard energy settings: biphasic 120 to 200 joules per the manufacturer's recommendation, escalating if needed. Pregnancy does not change the shock protocol, and the older practice of moving the fetus's monitor leads or applying fetal monitors during resuscitation is unnecessary and should not delay shocks. The one real-world issue is pad placement in a patient with large breasts or a gravid abdomen — anterolateral placement is standard, and anteroposterior is a reasonable alternative if the lateral pad won't adhere.
What the Neonatal Team Should Do — and What It Should Not
Neonatal resuscitation at 22 weeks is a separate question from maternal resuscitation, and the answer is that the neonatal team should not be activated for fetal rescue during maternal arrest. Every major framework for periviable birth, including the reporting from the Neonatal Research Network's extreme prematurity follow-up studies, describes 22-week survival as dependent on antenatal steroids, planned delivery in a center with a Level III or IV NICU, and immediate specialized neonatal care. None of those conditions are present in an arrest.
The ethical and practical position is that a 22-week fetus in maternal arrest is not a resuscitation candidate. Neonatal teams should be notified for situational awareness but not deployed to prepare resuscitation equipment for a delivery that isn't coming. This is a point of real friction in hospitals where obstetric and neonatal teams drill together, and it should be resolved in protocol before an event: the maternal arrest plan should explicitly state the gestational age threshold below which neonatal activation is informational only.
If the mother achieves return of spontaneous circulation and remains unstable, the obstetric team's role shifts to post-arrest management: continuous fetal monitoring is not indicated at 22 weeks for fetal benefit (monitoring is for maternal status), and the priority is maternal hemodynamic support, targeted temperature management decisions, and transfer to an appropriate critical care setting. The fetus at 22 weeks is previable regardless of maternal outcome, and the team should say so plainly to the family so expectations are not built on false hope.
There is a legitimate adjacent scenario worth naming: if the mother is stabilized and the pregnancy continues, periviable counseling becomes a separate, non-emergency discussion involving neonatology, maternal-fetal medicine, and the family. That conversation belongs days later, not in the resuscitation room. Mixing the two is a common source of family confusion during obstetric emergencies.
Team Roles, Communication, and the Two-Minute Reassessment
Obstetric arrest response needs named roles assigned within the first minute. The team lead states the gestational age, the compression standard, and the displacement instruction as a single script: "22 weeks, previable fetus, maternal focus, compressions at 100 to 120, manual left uterine displacement, no perimortem cesarean unless I call it." That sentence, delivered out loud, prevents the most common deviation — premature cesarean preparation.
The compressor rotates every two minutes with minimal interruption, and the displacement responder does not rotate out with the compressor unless another responder is available to take the position. The airway responder manages ventilation and confirms with capnography. The team lead runs rhythm checks, medication timing, and the reversible-cause review at each two-minute cycle. A scribe or recorder documents times and interventions, which matters both for care and for later review.
Communication failures in pregnancy arrest cluster around two things: gestational age not being stated or being stated once and forgotten, and family members in the room attempting to redirect the team toward fetal rescue. The team lead should restate gestational age at each rhythm check in the first five minutes, and one responder should be designated to speak with the family in plain terms — the mother is the patient, the baby cannot survive at this age, and the team is doing everything for her.
The two-minute reassessment should include a specific question: is the uterus plausibly causing hemodynamic compromise? If blood pressure remains unresponsive to adequate compressions, epinephrine, and manual displacement, and the uterus is large enough to compress the vena cava, the team lead should reconsider the mechanical contribution. At 22 weeks, that reconsideration almost never flips toward cesarean, but it should be asked rather than assumed either way.
Training, Simulation, and System Readiness for Previable Obstetric Arrest
Most obstetric arrest drills are built around third-trimester scenarios because those are the dramatic ones, and that bias leaves teams underprepared for the 22-week case. Simulation should include a previable scenario where the perimortem cesarean pathway is explicitly closed, forcing the team to practice the maternal-only focus under realistic pressure. The learning objective isn't knowledge — it's the habit of stating gestational age and closing the delivery question early.
Protocols should specify the gestational age cutoff for neonatal activation in maternal arrest, and the cutoff should match local NICU capability, not a national average. A center with a strong 22-week program may activate neonatology for a live birth in a planned delivery but still should not activate for a perimortem delivery during maternal arrest, because the outcomes are entirely different. The protocol should say that explicitly rather than leaving it to individual judgment.
Equipment readiness deserves a line of its own. The obstetrics arrest kit should include a backboard, manual displacement is a trained maneuver rather than equipment, and the kit should not include perimortem cesarean trays in a form that suggests they're first-line at every gestational age. Some centers place a laminated card on the kit stating the gestational age thresholds for delivery and neonatal activation; that single card reduces the most common error.
Debrief after every obstetric arrest should ask one question specifically about gestational age handling: was the age stated in the first minute, repeated at each rhythm check, and used correctly to close the delivery pathway when appropriate? That question, asked consistently, is what changes the next event. Training dollars are better spent on repeated low-fidelity drills with the previable scenario than on annual lectures.
FAQ
At 22 weeks, is there any situation where a perimortem cesarean should still be performed?
Yes, but the indication would be maternal decompensation rather than fetal rescue — for example, if the uterus is large for dates, manual displacement fails, and the patient's hemodynamics stay unresponsive despite adequate compressions and standard resuscitation. Even then, the decision is a team judgment made with obstetric and critical care input, and it should be documented as a maternal indication. The ACOG committee opinion on perimortem cesarean frames the procedure as a maternal intervention, which is the framing to use at this gestational age.
Does the compression depth or rate change for a pregnant patient at 22 weeks?
No. The 2020 AHA guidelines and their 2023 focused update keep the adult standard of 100 to 120 compressions per minute at 5 to 6 centimeters depth with full recoil for pregnant patients, and 22 weeks does not modify it. The pregnancy-specific adjustments are positioning and displacement, not compression mechanics. The most common quality failure in obstetric arrest is a soft mattress, which a backboard or a move to a hard surface fixes.
Is it true the team should check for fetal heart tones during the resuscitation?
No, and doing so is one of the most common errors in obstetric arrest response. Fetal heart tone checks interrupt compressions, provide no actionable information at 22 weeks, and cannot change management. The AHA's guidance emphasizes minimizing interruptions, and the standard for pulse and rhythm checks — under 10 seconds — applies to any bedside assessment, including ultrasound.
Would thrombolytics be given if the arrest is caused by a massive pulmonary embolism in a 22-week pregnant patient?
Many centers will give thrombolysis in a massive pulmonary embolism causing arrest despite pregnancy being a relative bleeding-risk consideration, and the decision should involve the obstetric and critical care teams. The dose follows standard adult protocols, and the bleeding risk is real — one reason the decision is made with named clinicians, not by default. Local massive PE protocols should specify who decides and how.
What should the team tell the family during the resuscitation?
One designated responder should tell the family plainly that the mother is the patient, that the fetus at 22 weeks cannot survive outside the womb, and that the team is doing everything possible for her. This conversation should happen in parallel with resuscitation, not after. Families frequently arrive expecting a "save the baby" narrative, and clear language early prevents conflict later.
Do neonatal teams need to be present for a 22-week maternal arrest?
They should be notified for situational awareness but not activated to prepare for delivery, because a perimortem delivery at 22 weeks produces an infant with essentially no chance of survival even in the strongest NICUs. The previable-birth literature, including the Neonatal Research Network's extremely preterm follow-up studies, describes 22-week survival only in planned deliveries with antenatal steroids and specialized teams. Hospital protocols should state this threshold explicitly so the decision isn't made in the moment.
Does left lateral tilt still have a role, or is manual displacement the only accepted technique?
Manual left uterine displacement is preferred by the AHA because it avoids the compression-quality penalty of tilt, and tilt is no longer routine. Some teams use a slight tilt (15 degrees) if manual displacement isn't feasible, but it should not replace a dedicated displacement responder when staffing allows. The displacement maneuver costs no compression time, which is why it's the first choice.
What's the biggest system-level gap in previable obstetric arrest readiness?
The most consistent gap is that obstetric arrest drills almost always use third-trimester scenarios, so teams rehearse a perimortem cesarean pathway that doesn't apply at 22 weeks and never rehearse closing it. Adding a previable scenario to the drill rotation — with the explicit learning objective of stating gestational age and closing the delivery pathway in the first minute — addresses the highest-yield failure mode. The second gap is equipment: a backboard in the obstetric arrest kit and a laminated gestational-age threshold card.
This article is general educational information for clinicians and trained responders, not a diagnosis, treatment plan, or protocol substitute. Cardiac arrest in pregnancy is a high-stakes emergency that requires direction from a qualified local resuscitation and obstetric team following institutional protocol and current guidelines from bodies such as the American Heart Association and the American College of Obstetricians and Gynecologists. For any immediate danger, call local emergency services without delay.