Cardiac arrest prevents the heart from pumping blood effectively to the body. CPR and other resuscitation efforts help maintain blood flow while the team works to restore effective heart function.
When circulation returns, the patient has reached a critical point in the resuscitation process known as return of spontaneous circulation, or ROSC. However, the return of circulation does not mean the patient is fully recovered. Close assessment and continued treatment are still needed.
This guide explains what ROSC means in medical terms, how it is recognized during CPR, what happens after ROSC, and what can help restore circulation.
What Does ROSC Mean in Medical Terms?
ROSC stands for Return of Spontaneous Circulation. In medical terms, ROSC refers to the return of effective circulation after cardiac arrest, when the heart regains sufficient function to pump blood on its own.
The term is commonly used in emergency medicine, CPR, BLS, and ACLS to describe the point at which effective circulation returns during resuscitation. An organized electrical rhythm alone does not mean that ROSC has occurred. There must also be evidence that the heart is pumping blood effectively.
What Does ROSC Mean in CPR?
In CPR, ROSC means that effective circulation has returned after cardiac arrest. During cardiac arrest, chest compressions provide artificial circulation while the resuscitation team works to restore the heart’s function.
When ROSC occurs, the heart has resumed effective circulation, so chest compressions are no longer needed to maintain blood flow. The team then focuses on airway management, oxygenation, ventilation, blood pressure, diagnostic evaluation, and treatment of the underlying cause of cardiac arrest.
What Are the Signs of ROSC During CPR?
ROSC is identified by assessing whether effective circulation has returned during resuscitation. The clinical team checks for signs that the heart has resumed effective circulation after cardiac arrest. These findings help determine whether ROSC has occurred.
Palpable Pulse
A palpable central pulse can indicate that the heart has resumed effective circulation. During cardiac arrest, the absence of a pulse indicates that the heart is not producing effective circulation. When a pulse returns, the resuscitation team assesses whether circulation has been restored.
Organized Heart Rhythm
An ECG or monitor may show an organized heart rhythm when cardiac activity returns. However, an organized rhythm alone does not confirm ROSC. The heart must also pump enough blood to produce a pulse and measurable blood pressure.
Measurable Blood Pressure
A measurable blood pressure shows that the heart is pumping blood through the body. After ROSC, blood pressure may still fall, so it should be monitored closely. If blood pressure becomes too low, treatment may be needed to maintain adequate blood flow to the brain and other organs.
Sudden Increase in End-Tidal CO₂
A sudden and sustained increase in end-tidal carbon dioxide can be an important sign that circulation has returned during CPR. Improved blood flow through the lungs increases carbon dioxide delivery to the lungs, which can produce a noticeable rise in the measured value.
A sudden rise in end-tidal carbon dioxide can occur when blood flow increases after the heart resumes effective pumping. However, this change alone does not confirm ROSC and should be considered with other clinical findings.
Spontaneous Breathing
Spontaneous breathing may return after the heart resumes effective circulation. Breathing may indicate that the patient has regained some neurologic and respiratory function, but spontaneous breathing alone does not confirm ROSC.
Purposeful Movement or Coughing
After ROSC, the patient may begin to wake up, move purposefully, cough, or respond to the resuscitation team as brain function begins to recover. These changes can indicate that circulation has returned, but they do not confirm ROSC on their own. The team should assess them along with other signs of effective circulation, such as a palpable pulse and measurable blood pressure.
Return of Responsiveness
The patient may begin responding to voice, touch, or other stimuli when circulation returns to the brain after cardiac arrest. Regaining consciousness or showing purposeful movement can support recognition of ROSC, but a patient may remain unresponsive even after circulation has returned.
Improved Skin Color
The skin may become less pale, blue, or gray as blood flow and oxygen delivery improve after ROSC. A change in skin color can support recognition of ROSC, but it should not be used alone to confirm that circulation has returned.
What Happens After ROSC?
After ROSC, care shifts from cardiac arrest resuscitation to post-cardiac arrest care. The healthcare team focuses on stabilizing the patient and monitoring for problems that can occur after circulation returns.
Key areas of care include:
- Airway and breathing: Maintain adequate oxygenation and breathing while supporting the airway as needed.
- Blood pressure and circulation: Monitor blood pressure and circulation to maintain adequate blood flow to vital organs.
- Heart rhythm: Monitor the cardiac rhythm and assess for abnormalities or recurrent cardiac arrest.
- Neurologic status: Assess the patient’s level of consciousness and monitor brain function.
- Underlying cause: Identify and treat the cause of the cardiac arrest when possible.
- Ongoing monitoring: Continue close observation to detect changes and prevent recurrent cardiac arrest.
Can ROSC Be Temporary?
Yes. ROSC can be temporary, and cardiac arrest can recur after circulation returns. This may happen when the underlying cause remains unresolved or a new complication causes circulation to fail again.
Patients require continued monitoring and post-cardiac arrest care after ROSC to maintain circulation and prevent recurrent cardiac arrest.
What Can Increase the Chance of ROSC During CPR?
Several factors can affect whether circulation is restored during cardiac arrest. High-quality resuscitation requires the team to maintain effective CPR, respond appropriately to the cardiac arrest rhythm, and address problems that may prevent the heart from restarting.
Start CPR Early
Early, high-quality CPR helps maintain blood flow to the heart and brain while the resuscitation team works to restore circulation. For adults, give chest compressions at a rate of 100 to 120 per minute and a depth of at least 2 inches (5 cm). After each compression, let the chest return to its normal position before giving the next one. Keep interruptions to a minimum and make any pauses in chest compressions as short as possible.
Use an AED or Defibrillator for Shockable Rhythms
Early automated external defibrillator is critical when cardiac arrest is caused by ventricular fibrillation or pulseless ventricular tachycardia. A defibrillatory shock can terminate ventricular fibrillation or pulseless ventricular tachycardia, allowing the heart to resume an organized rhythm. Continue CPR with as little interruption as possible during defibrillation.
Give Epinephrine When Indicated
Epinephrine is given during adult cardiac arrest to help maintain blood flow to the heart and brain. The timing depends on the cardiac arrest rhythm. For a non-shockable rhythm, give epinephrine as soon as feasible. For a shockable rhythm, give epinephrine after initial defibrillation attempts have been made and CPR has continued.
Treat Reversible Causes
The resuscitation team should identify and treat conditions that may cause or prolong cardiac arrest, known as the H’s and T’s. These include hypovolemia, hypoxia, acidosis, hypokalemia or hyperkalemia, and hypothermia, along with tension pneumothorax, cardiac tamponade, toxins, pulmonary thrombosis, and coronary thrombosis.
Manage the Airway and Ventilation
Effective ventilation provides oxygen during CPR. Manage the airway according to the patient’s condition. Avoid excessive ventilation, which can reduce blood flow back to the heart and interfere with effective CPR.
What Happens If ROSC Is Not Achieved?
If ROSC is not achieved, the resuscitation team continues efforts to restore circulation while identifying factors that may be preventing it.
Continue CPR and Advanced Resuscitation
High-quality CPR continues with ongoing rhythm assessment, defibrillation when indicated, and appropriate medications as part of advanced resuscitation.
Identify and Treat Reversible Causes
The team looks for reversible causes of cardiac arrest and treats them when possible. Correcting these causes may help restore effective circulation.
Continue Resuscitation Efforts
Resuscitation continues while there is a possibility of restoring circulation. The team reassesses the patient’s response and adjusts treatment as needed.
When ROSC Cannot Be Achieved
If effective circulation cannot be restored despite continued resuscitation, the patient may be pronounced dead according to applicable medical and legal protocols.
The Life-Saving Impact of Recognizing and Achieving ROSC
ROSC is a major turning point during cardiac arrest because it means effective circulation has returned. Recognizing ROSC allows the team to transition to post-cardiac arrest care and continue monitoring the patient.
If you want to feel confident and ready to respond in an emergency, training makes all the difference. Bayside CPR provides AHA Standard ACLS, BLS, PALS, CPR, and First Aid certification courses. Complete the required coursework and skills training to prepare for cardiac emergencies and earn your certification after successful completion.
