This glossary defines essential Cardiopulmonary Resuscitation (CPR), Basic Life Support (BLS), Advanced Cardiac Life Support (ACLS), and Pediatric Advanced Life Support (PALS) terms. It is designed to help learners, healthcare providers, and the general public understand key life-saving concepts used in modern resuscitation practices.
A structured primary assessment approach is used in emergency care to rapidly identify and manage life-threatening conditions. It prioritizes airway patency, effective breathing, circulation status, and neurological function. It is commonly used in trauma and pediatric emergencies for quick clinical evaluation.
A set of advanced, evidence-based clinical guidelines used by healthcare providers to manage cardiac arrest and other life-threatening cardiovascular emergencies. It includes the use of medications, advanced airway techniques, ECG interpretation, and defibrillation. ACLS aims to improve survival outcomes through standardized emergency interventions.
A step-by-step clinical decision-making framework used during cardiac emergencies to guide resuscitation efforts. It helps healthcare providers select appropriate interventions such as CPR, defibrillation, airway management, and drug administration. The algorithm ensures a consistent and effective emergency response.
A portable electronic device that analyzes the heart’s rhythm and delivers an electric shock when a shockable rhythm is detected. It is designed to restore normal heart rhythm in cases of sudden cardiac arrest. AEDs are user-friendly and can be operated by trained laypersons in emergencies.
A medical device, such as an endotracheal tube or supraglottic airway used to secure and maintain a patent airway. It is used when a patient cannot maintain adequate breathing independently. Advanced airways support effective oxygenation and ventilation during critical care.
Abnormal, slow, and gasping breathing that occurs during cardiac arrest due to brainstem reflex activity. It does not provide effective oxygen exchange and should not be mistaken for normal breathing. It is a critical sign indicating the need for immediate CPR.
The anatomical passage that allows air to travel into the lungs for respiration. In emergency care, maintaining an open airway is essential to ensure adequate oxygen delivery. Airway obstruction can rapidly lead to hypoxia and cardiac arrest.
An antiarrhythmic medication used in advanced cardiac life support to treat life-threatening ventricular arrhythmias. It is commonly used in ventricular fibrillation and pulseless ventricular tachycardia when defibrillation alone is not sufficient. It helps stabilize cardiac electrical activity.
A cardiac arrest rhythm characterized by the complete absence of electrical activity in the heart, also known as a “flatline.” It indicates no effective heart function or blood circulation. Immediate CPR and advanced life support are required, as defibrillation is not effective.
A medication used in emergency care to treat symptomatic bradycardia by blocking parasympathetic (vagal) influence on the heart. This results in an increased heart rate and improved cardiac output. It is used when a slow heart rate leads to instability.
Arrhythmia is a medical condition in which the heart beats with an abnormal rhythm, either too fast, too slow, or irregular. It occurs due to disruptions in the heart’s electrical conduction system. Arrhythmias can range from harmless to life-threatening depending on their type and severity.
Adenosine is a fast-acting antiarrhythmic medication used in emergency care to treat supraventricular tachycardia (SVT). It works by temporarily blocking electrical conduction through the atrioventricular (AV) node to help restore normal heart rhythm. It is administered intravenously under strict medical supervision due to its very short duration of action.
AHA Guidelines are evidence-based recommendations developed by the American Heart Association for CPR and emergency cardiovascular care. They are regularly updated based on current scientific research and provide standardized protocols for CPR, ACLS, and emergency response to improve survival outcomes.
The American Heart Association (AHA) is a nonprofit organization established in 1924 that develops evidence-based guidelines for CPR and emergency cardiovascular care. It focuses on reducing heart disease and stroke through research, education, and training programs.
The American Red Cross is a humanitarian organization that provides emergency assistance, disaster relief, and health education. It also offers CPR, first aid, and lifeguarding training to help people respond effectively in emergencies.
A Bag-Valve-Mask (BVM) is a manual ventilation device used to deliver positive-pressure breaths to patients who are not breathing adequately. It helps maintain oxygenation and ventilation in emergency situations before advanced airway placement. It is commonly used in CPR and resuscitation settings.
Basic Life Support (BLS) is a level of emergency medical care that includes CPR, AED use, and basic airway management. It is aimed at maintaining circulation and breathing until advanced medical help arrives. BLS is the foundation of emergency cardiovascular care.
The BLS Algorithm is a structured step-by-step guide used during basic life support to ensure proper emergency response. It includes scene safety, recognition of cardiac arrest, CPR initiation, and defibrillation when needed. It standardizes actions to improve survival outcomes.
Bradycardia is a condition in which the heart rate is slower than normal, usually below 60 beats per minute in adults. It can reduce blood flow and oxygen delivery to vital organs, especially when symptomatic. Severe cases may require emergency medical treatment.
Breathing is the process of inhaling oxygen and exhaling carbon dioxide to maintain normal body function. In emergency care, breathing must be closely monitored as inadequate breathing can quickly lead to hypoxia. It is a key component of primary patient assessment.
C-A-B is the recommended sequence for performing CPR, where chest compressions are initiated first to maintain blood circulation. After compressions, airway and breathing are addressed to support oxygen delivery. This approach improves survival in cardiac arrest situations.
Capnography is a monitoring technique that measures carbon dioxide levels in exhaled air. It is used to assess CPR effectiveness, confirm correct airway placement, and detect return of spontaneous circulation. It provides real-time feedback during resuscitation.
Cardiac arrest is a sudden loss of heart function where the heart stops pumping blood effectively. It leads to immediate collapse and loss of circulation to vital organs. It requires urgent CPR and defibrillation to improve survival chances.
The Chain of Survival is a series of critical actions that improve survival in cardiac arrest. It includes early recognition, immediate CPR, rapid defibrillation, advanced life support, and post-resuscitation care. Each step is essential for increasing survival rates.
Chest compressions are rhythmic pushes applied to the center of the chest to manually pump blood during cardiac arrest. They are performed at a rate of 100–120 per minute with adequate depth to maintain circulation. High-quality compressions are critical for effective CPR.
CPR is an emergency life-saving procedure that combines chest compressions and rescue breaths. It is used to maintain blood circulation and oxygen supply during cardiac arrest. CPR helps preserve brain and organ function until advanced care is available.
A CPR cycle refers to the repeated sequence of 30 chest compressions followed by 2 rescue breaths. It is designed to maintain oxygenation and blood circulation during resuscitation. Continuous cycles are performed until normal heart function returns or help arrives.
Chest Compression Fraction (CCF) is the percentage of time chest compressions are actively performed during CPR. A higher CCF indicates fewer interruptions and better blood flow to vital organs. Maintaining a CCF of 60% or higher improves survival outcomes.
Coronary thrombosis occurs when a blood clot forms in the coronary arteries, blocking blood flow to the heart muscle. It can lead to myocardial infarction and cardiac arrest if untreated. Rapid intervention is essential to restore blood flow.
Defibrillation is the delivery of an unsynchronized electrical shock to the heart using a defibrillator. It is used to treat life-threatening arrhythmias such as ventricular fibrillation and pulseless ventricular tachycardia. The goal is to restore a normal heart rhythm and restart effective cardiac activity.
Disability is a rapid neurological assessment performed during the primary survey to evaluate a patient’s level of consciousness. It often uses tools like the Glasgow Coma Scale (GCS) to assess brain function. It helps identify early signs of neurological impairment in emergency situations.
Distributive shock is a type of shock caused by widespread dilation of blood vessels, leading to poor blood flow distribution. Despite normal or increased blood volume, tissues do not receive adequate oxygen. It requires urgent medical treatment to restore vascular tone and circulation.
An ECG is a diagnostic test that records the electrical activity of the heart over time. It is used to detect abnormal heart rhythms, myocardial infarction, and other cardiac conditions. It helps healthcare providers assess heart function quickly and accurately.
ECPR is an advanced resuscitation technique that uses extracorporeal membrane oxygenation (ECMO) during cardiac arrest. It provides temporary heart and lung support when conventional CPR is not effective. It helps maintain circulation and oxygenation until recovery or further treatment.
Emergency Medical Services (EMS) is a system of trained medical professionals who provide urgent pre-hospital care. They respond to emergencies, deliver life-saving treatment, and transport patients to healthcare facilities. EMS plays a critical role in early emergency response and survival.
An endotracheal tube is a flexible tube inserted into the trachea to secure the airway. It is used to maintain ventilation in patients who cannot breathe adequately on their own. It is commonly used in advanced resuscitation and surgical procedures.
Epinephrine is a life-saving medication used during cardiac arrest to improve blood flow to vital organs. It works by increasing heart rate, vasoconstriction, and cardiac output. It is a key drug in advanced cardiac life support protocols.
ETCO₂ is a measurement of carbon dioxide levels in exhaled air during breathing or CPR. It is used to assess CPR effectiveness, confirm airway placement, and detect return of spontaneous circulation. It provides real-time feedback on patient ventilation and perfusion status.
Feedback devices are tools used during CPR to monitor and improve performance in real time. They provide information on compression rate, depth, recoil, and overall quality of chest compressions. These devices help rescuers maintain high-quality CPR and improve patient outcomes.
A first responder is the first trained person to arrive at an emergency scene and provide immediate care. They may perform CPR, use an AED, or assist with airway and breathing support before advanced medical help arrives. Their quick action is critical in improving survival chances.
Foreign Body Airway Obstruction is a life-threatening condition where an object blocks the airway partially or completely. It prevents normal breathing and oxygen delivery to the lungs and brain. Immediate actions such as back blows, abdominal thrusts, or CPR are required depending on severity.
The Glasgow Coma Scale is a standardized clinical tool used to assess a patient’s level of consciousness after a brain injury or medical emergency. It evaluates eye opening, verbal response, and motor response to determine neurological function. The total score helps guide the severity and treatment decisions.
The Good Samaritan Law is a legal protection that encourages individuals to assist in emergencies without fear of legal liability. It protects those who provide reasonable aid in good faith and without gross negligence. The law is designed to promote timely help in life-threatening situations.
Gasping is an abnormal and ineffective breathing pattern commonly seen during cardiac arrest. It appears as irregular, slow, or labored breaths that do not provide adequate oxygen to the body. It should never be mistaken for normal breathing and requires immediate CPR intervention.
Hands-Only CPR is a simplified form of cardiopulmonary resuscitation that involves continuous chest compressions without rescue breaths. It is recommended for untrained bystanders in cases of sudden cardiac arrest. This method helps maintain blood circulation until professional help arrives.
The head-tilt/chin-lift is a manual technique used to open the airway of an unconscious patient. It involves tilting the head backward and lifting the chin to prevent airway blockage by the tongue. It is commonly used when no spinal injury is suspected.
Hyperventilation is a condition where breathing becomes excessively rapid or deep, leading to reduced carbon dioxide levels in the blood. In emergency care, it can reduce CPR effectiveness if performed incorrectly. It may also cause dizziness, reduced blood flow, and complications in resuscitation.
Hypovolemic shock is a life-threatening condition caused by severe loss of blood or body fluids. This leads to reduced blood circulation and insufficient oxygen delivery to vital organs. Immediate fluid replacement and emergency treatment are required to prevent organ failure.
Hypoxia is a condition in which body tissues do not receive enough oxygen to function properly. It can rapidly lead to organ damage, unconsciousness, and cardiac arrest if untreated. Early oxygen support is essential to prevent serious complications.
Hs and Ts is a mnemonic used in advanced life support to identify reversible causes of cardiac arrest. It includes conditions such as hypovolemia, hypoxia, acidosis, electrolyte imbalance, hypothermia, and others, like tamponade and thrombosis. Recognizing these helps guide targeted emergency treatment.
An infant is a child from birth up to one year of age. In emergency care, infants require specialized CPR techniques due to their smaller anatomy and delicate physiological systems. Care must be adapted to ensure safe and effective resuscitation.
Intraosseous access is a medical technique used to deliver fluids and medications directly into the bone marrow. It is typically used in emergency situations when intravenous access is difficult or impossible. This method allows rapid vascular access for life-saving treatment.
Intubation is a medical procedure where a flexible tube is inserted into the trachea to secure the airway. It helps maintain breathing and supports oxygen delivery in critically ill or unconscious patients. It is commonly used during advanced resuscitation and surgery.
Ischemia is a condition where blood flow to tissues or organs is reduced or blocked. This leads to insufficient oxygen supply and can cause tissue damage or organ failure if prolonged. It is a serious condition that often requires urgent medical intervention.
Junctional rhythm is an abnormal heart rhythm that originates from the atrioventricular (AV) node instead of the sinoatrial (SA) node. This can result in a slower or irregular heart rate compared to a normal sinus rhythm. It may reduce cardiac output depending on the rate and patient condition.
The jaw thrust maneuver is a manual technique used to open the airway by moving the jaw forward without tilting the head. It is especially useful in trauma patients where spinal injury is suspected. This method helps maintain a safe and open airway while minimizing neck movement.
Kussmaul breathing is a deep, rapid, and labored breathing pattern typically associated with severe metabolic acidosis. It is most commonly seen in conditions like diabetic ketoacidosis (DKA). This breathing pattern is the body’s compensatory response to reduce excess acid by expelling carbon dioxide.
The knee position refers to the recommended body posture of a rescuer during CPR. The rescuer kneels beside the patient at an appropriate distance to maintain balance and perform effective chest compressions. This position ensures proper technique, stability, and efficiency during resuscitation.
The laryngeal mask airway is a supraglottic airway device placed in the throat to maintain an open airway. It allows ventilation when endotracheal intubation is not required or cannot be performed. It is commonly used in emergency and anesthesia settings for airway support.
Lethal arrhythmias are life-threatening heart rhythms that can rapidly lead to cardiac arrest if not treated immediately. The most common types include ventricular fibrillation (VF) and ventricular tachycardia (VT). These conditions require urgent defibrillation and advanced cardiac care.
Lidocaine is an antiarrhythmic medication used in advanced cardiac life support. It is commonly administered for refractory ventricular fibrillation and pulseless ventricular tachycardia when first-line treatments are ineffective. It helps stabilize abnormal electrical activity in the heart.
A lay rescuer is a non-medical individual trained or willing to provide basic life-saving care in emergencies. This includes performing CPR and using an AED until professional help arrives. Their immediate action can significantly improve survival outcomes.
Magnesium sulfate is a medication used in emergency cardiac care to treat specific life-threatening arrhythmias. It is especially effective in conditions like torsades de pointes and helps stabilize abnormal cardiac electrical activity. It is also used to support overall heart rhythm stability in critical cases.
Monitored resuscitation is a method of advanced life support where the patient’s heart rhythm, oxygen levels, and vital signs are continuously observed. This allows healthcare providers to adjust treatment in real time based on patient response. It improves decision-making and overall resuscitation effectiveness.
A manikin is a life-sized training model used for practicing CPR, airway management, and other emergency procedures. It provides a safe and realistic environment for medical training without risk to real patients. Manikins help improve skill accuracy and confidence in emergency care.
MONA is a historically used acronym for the initial management of acute coronary syndrome. It includes morphine, oxygen, nitrates, and aspirin as early treatment options. Modern guidelines now recommend more individualized care rather than the routine use of all components.
Naloxone is a medication used to rapidly reverse the effects of opioid overdose. It works by blocking opioid receptors in the brain and restoring normal breathing in cases of respiratory depression or arrest. It is a critical emergency drug used in suspected opioid toxicity.
Neonatal refers to newborn infants during the first 28 days of life. In emergency care, neonates require specialized assessment and resuscitation techniques due to their unique physiology. Care must be highly precise to ensure safe oxygenation and circulation support.
Non-shockable rhythms are heart rhythms that do not respond to defibrillation. These mainly include asystole and pulseless electrical activity (PEA). They require immediate CPR and medication-based treatment rather than electrical shock therapy.
An opioid emergency is a life-threatening condition caused by opioid overdose, leading to severe respiratory depression or cardiac arrest. It requires immediate intervention, such as CPR and administration of naloxone when available. Rapid response is critical to prevent brain damage or death.
Oxygenation is the physiological process of delivering oxygen from the lungs into the bloodstream and then to body tissues. It is essential for maintaining cellular function and organ survival. In emergency care, ensuring adequate oxygenation helps prevent hypoxia and organ failure.
Out-of-hospital cardiac arrest refers to a sudden cardiac arrest occurring outside a hospital setting, such as at home or in public places. It requires immediate recognition, bystander CPR, and quick activation of emergency medical services. Early intervention significantly increases survival chances.
Pediatric Advanced Life Support (PALS) is an advanced emergency care system designed for infants and children. It focuses on the assessment and management of pediatric cardiac, respiratory, and shock emergencies using structured, evidence-based protocols. It ensures age-appropriate resuscitation and critical care.
Pulseless Electrical Activity is a life-threatening condition where the heart shows electrical activity on the monitor but produces no effective pulse or circulation. It requires immediate CPR and identification of underlying reversible causes. Defibrillation is not effective in this rhythm.
PETCO₂ is a measurement of carbon dioxide levels in exhaled air during breathing. It is used in CPR to assess compression quality, confirm correct airway placement, and detect return of spontaneous circulation (ROSC). It is an important indicator of resuscitation effectiveness.
Personal Protective Equipment includes items such as gloves, masks, gowns, and face shields used by rescuers. It helps protect against infection and ensures safety during emergency medical procedures. Proper PPE use is essential in all resuscitation situations.
Post-resuscitation care is the medical management provided after return of spontaneous circulation (ROSC). It focuses on stabilizing heart function, maintaining oxygen levels, and preventing organ damage. This phase is critical for improving survival and neurological outcomes.
The primary survey is a rapid assessment process used in emergency care to identify life-threatening conditions. It follows the ABCDE approach: Airway, Breathing, Circulation, Disability, and Exposure. It ensures immediate recognition and treatment of critical issues.
Pulseless Ventricular Tachycardia is a shockable cardiac arrest rhythm characterized by rapid ventricular activity without a detectable pulse. It leads to ineffective blood circulation and requires immediate defibrillation and CPR. Prompt treatment is essential for survival.
Post-cardiac arrest care involves specialized treatment after successful resuscitation to support heart and brain function. It includes stabilizing blood pressure, optimizing oxygenation, and preventing further organ damage. This care phase significantly influences patient recovery outcomes.
Pulmonary embolism is a condition where a blood clot blocks an artery in the lungs, reducing oxygen exchange and blood flow. It is a potentially life-threatening cause of cardiac arrest. It is included in the reversible causes under Hs and Ts.
Quality of chest compressions refers to how effectively CPR compressions are performed to maintain blood circulation during cardiac arrest. It includes correct depth (at least 2 inches in adults), proper rate (100–120 compressions per minute), full chest recoil, and minimal interruptions. High-quality compressions are essential for improving survival outcomes.
Recoil refers to the complete return of the chest to its normal position after each chest compression during CPR. Full chest recoil is essential because it allows the heart to refill with blood between compressions. Proper recoil improves blood flow and CPR effectiveness.
The recovery position is a side-lying position used for an unconscious but breathing patient. It helps maintain an open airway and reduces the risk of aspiration or airway obstruction. This position is commonly used when CPR is not required, but monitoring is needed.
Rescue breaths are artificial breaths given during CPR to provide oxygen to the lungs when a person is not breathing adequately. They are delivered after chest compressions in a standard CPR cycle. These breaths help maintain oxygen supply to vital organs.
Return of spontaneous circulation (ROSC) is the restoration of a sustained heartbeat and effective blood circulation after resuscitation. It indicates that the heart has resumed pumping blood on its own. ROSC is a critical milestone in successful CPR outcomes.
Shock is a life-threatening condition where the body’s tissues do not receive adequate blood flow and oxygen. This leads to organ dysfunction if not treated promptly. It can result from various causes such as blood loss, infection, or cardiac failure.
Shockable rhythms are abnormal heart rhythms that can be treated with defibrillation. The most common types include ventricular fibrillation (VF) and pulseless ventricular tachycardia (pVT). Immediate defibrillation is critical for survival.
The sternum is the flat bone located in the center of the chest, also known as the breastbone. It serves as the correct landmark for placing hands during chest compressions in CPR. Proper positioning ensures effective compression depth and safety.
Sudden cardiac arrest is an unexpected loss of heart function, breathing, and consciousness. It occurs when the heart suddenly stops pumping blood effectively. Immediate CPR and defibrillation are essential to improve survival chances.
Supraventricular tachycardia is a rapid heart rhythm originating above the ventricles. It may cause symptoms such as palpitations, dizziness, or chest discomfort. Severe cases can lead to instability and require medical treatment.
Synchronized cardioversion is a controlled electrical shock delivered in sync with the heart’s rhythm. It is used to treat unstable arrhythmias in patients who still have a pulse. Synchronization reduces the risk of inducing dangerous rhythms.
Scene safety is the first step in any emergency response, involving assessment of the environment for hazards. It ensures the safety of rescuers, patients, and bystanders before providing care. Proper scene evaluation prevents additional injuries.
Tachycardia is a condition where the heart beats faster than normal, typically above 100 beats per minute in adults. This can reduce the heart’s efficiency in pumping blood effectively. In severe cases, it may lead to dizziness, chest pain, or cardiac instability.
Trauma refers to physical injury or damage caused by external forces such as accidents, falls, or violence. It can range from minor injuries to life-threatening conditions requiring immediate emergency care. Rapid assessment and treatment are critical in trauma cases.
Two-rescuer CPR is a coordinated resuscitation technique performed by two trained individuals. One rescuer performs chest compressions while the other manages the airway and provides ventilation. This approach improves efficiency and reduces fatigue during CPR.
Targeted Temperature Management is a post-cardiac arrest treatment used to control a patient’s body temperature. It helps reduce brain damage and improves neurological outcomes after return of spontaneous circulation (ROSC). Careful temperature regulation supports recovery.
Unconscious or unresponsive describes a state in which a person does not react to verbal commands, touch, or painful stimuli. It indicates a serious medical emergency requiring immediate assessment of airway, breathing, and circulation. Prompt intervention is critical to prevent further deterioration.
Unstable tachycardia is a dangerously fast heart rhythm associated with poor blood circulation and signs of instability. Symptoms may include low blood pressure, chest pain, confusion, or shock. It requires urgent treatment, often with synchronized cardioversion, to restore a stable rhythm.
Ventilation is the process of delivering breaths to a patient either manually or with mechanical support. It ensures oxygen enters the lungs and carbon dioxide is removed from the body. In emergencies, proper ventilation is essential to maintain adequate oxygen levels and support survival.
Ventricular fibrillation is a life-threatening heart rhythm in which the ventricles quiver irregularly instead of pumping blood effectively. This results in a complete loss of circulation and requires immediate defibrillation. Without rapid treatment, it can quickly lead to death.
Ventricular tachycardia is a rapid heart rhythm originating from the ventricles. It can reduce cardiac output and may progress to pulseless ventricular tachycardia or cardiac arrest if untreated. Prompt medical intervention is necessary to restore a stable rhythm.
Wide complex tachycardia is a fast heart rhythm characterized by widened QRS complexes on an ECG. It often originates from the ventricles and may indicate a serious cardiac condition. Prompt evaluation and treatment are required due to its potential to become life-threatening.
Witnessed collapse occurs when a person suddenly falls or loses consciousness in front of an observer. It enables quick identification of a possible cardiac arrest and faster emergency response. Immediate action, including calling for help and starting CPR, is critical.
Xenon anesthesia refers to the use of xenon gas as an anesthetic agent with potential neuroprotective properties. It is being studied for its ability to reduce brain injury after cardiac arrest. However, it is not currently part of standard clinical resuscitation practice.
The xiphoid process is a small, cartilaginous extension located at the lower end of the sternum. During CPR, pressure must be avoided on this area to prevent internal injury. Proper hand placement above the xiphoid ensures safe and effective chest compressions.
A chest X-ray is a diagnostic imaging tool used to evaluate the lungs, heart, and chest structures. In emergency care, it helps confirm the correct placement of an endotracheal tube and assess complications after resuscitation. It provides quick and valuable clinical information.
Yankauer suction is a rigid suction device used to clear fluids such as blood, saliva, or secretions from the airway. It helps maintain airway patency and prevents aspiration during emergency care. It is commonly used in resuscitation and clinical settings.
Youth training refers to CPR and emergency response education designed for young learners. It focuses on recognizing emergencies, calling for help, and performing basic life-saving skills such as hands-only CPR. Early training helps build confidence and improve community response in emergencies.
A Zoll defibrillator is a professional-grade medical device used by healthcare providers to deliver controlled electrical shocks during cardiac emergencies. It also provides advanced monitoring features such as ECG and real-time CPR feedback. It supports both basic and advanced life support interventions.
The zone of safety is a designated area established around an emergency scene to protect rescuers, patients, and bystanders. It helps minimize exposure to hazards while allowing effective medical care to be delivered.
