Pediatric advanced life support (PALS) is a course offered by the American Heart Association (AHA) for health care providers who take care of children and infants in the emergency room, critical care and intensive care units in the hospital, and out of hospital (emergency medical services (EMS)). The course teaches healthcare providers how to assess injured and sick children and recognize and treat respiratory distress/failure, shock, cardiac arrest, and arrhythmias. [1]
PALS builds upon AHA's Pediatric Basic Life Support (BLS). Providers should follow the AHA's Pediatric BLS Algorithms for single and ≥ 2 person rescuer. The most essential component of BLS and PALS cardiac arrest care is high quality cardiopulmonary resuscitation (CPR). CPR should begin with a check for responsiveness, getting help, and activating the emergency response system. [2] After this, the provider should assess for breathing and a pulse (brachial pulse in infant and carotid pulse in child) - all within 10 seconds. [3] If no pulse and no breathing or only gasping, start CPR. CPR consists of chest compressions followed by rescue breaths - for single rescuer do 30 compressions and 2 breaths (30:2), for > 2 rescuers do 15 compressions and 2 breaths (15:2). The rate of chest compressions should be 100-120 compressions/min and depth should be 1.5 inches for infants and 2 inches for children.[ citation needed ]
Chest compressions differ between infants and children. For infants, chest compressions can be done with the two-fingers technique (single rescuer) or two-thumbs encircling hands technique (2 rescuer). In the two-fingers technique, the provider uses their index and middle finger to press down on the infant's sternum, below the nipples. In the two-thumb encircling hands technique, the provider's hands should wrap around the chest with both thumbs pressing down on the infant's sternum. For children, chest compressions should be done with the provider placing the heel of one hand over the child's lower chest and pressing down while keeping their arms straightened at the elbow.
If help hasn't arrived after 2 minutes, the provider should call for help again and get an automated external defibrillator (AED). Once help and the AED arrives, the provider should place the AED pads on the child, making sure to not disrupt chest compressions. The AED will let the provider know if the child has a shockable heart rhythm. If shockable, give a shock and then immediately resume CPR. [2]
PALS teaches a systematic assessment approach so that the health care provider can quickly identify any life-threatening conditions and treat them. The PALS systematic approach algorithm begins with a quick initial assessment followed by checking for responsiveness, pulse, and breathing. If the child has no pulse and isn't breathing, start CPR. If the child has a pulse but isn't breathing, provide ventilation and give oxygen (when possible). Once it has been established that the child has a pulse, is breathing, and doesn't require immediate life saving treatment, the provider will begin their primary assessment followed by a secondary assessment and further diagnostic workup. Continuous reassessments should be done to reassess for life-threatening conditions. [4]
age | awake rate | sleeping rate |
---|---|---|
neonate (less than 28 days) | 100-205 | 90-160 |
infant (1 month till 1 year) | 100-180 | 90-160 |
toddler (1–2 years) | 98-140 | 80-120 |
pre-school (3–5 years) | 80-120 | 65-100 |
school-age (6–11 years) | 75-118 | 58-90 |
adolescent (12–15 years) | 60-100 | 50-90 |
age | normal respiratory rate |
---|---|
infant (1 month till 1 year) | 30-55 |
toddler (1–2 years) | 20-30 |
pre-school (3–5 years) | 20-25 |
school-age (6–11 years) | 14-22 |
adolescent (12–15 years) | 12-18 |
age | systolic blood pressure | diastolic blood pressure |
---|---|---|
birth till 12 hours | 60-85 | 45-55 |
neonate | 67-84 | 35-53 |
infant (1 month till 1 year) | 80-100 | 55-65 |
toddler (1–2 years) | 90-105 | 55-70 |
pre-school (3–5 years) | 95-107 | 60-71 |
school-age (6–11 years) | 95-119 | 60-76 |
adolescent (12–15 years) | 110-124 | 70-79 |
The initial assessment is meant to be a very quick assessment performed within the first few seconds of interacting with a child and it utilizes the acronym ABC - appearance, breathing, and color. The provider will assess appearance (level of consciousness and responsiveness, speaking or crying), breathing (breathing or not breathing, increased work of breathing, abnormal breath sounds), and color (pale, mottled, cyanotic, bleeding). [4]
The primary assessment uses the acronym ABCDE - airway, breathing, circulation, disability, exposure.
Airway - assess airway patency (open/patent, unobstructed vs obstructed) and if the patient will need assistance maintaining their airway
Breathing - assess respiratory rate, respiratory effort, lung sounds, airway sounds, chest movement, oxygen saturation via pulse oximetry
Circulation - assess heart rate, heart rhythm, pulses, skin color, skin temperature, capillary refill time, blood pressure
Disability - assess neurological function with AVPU pediatric response scale (alert, voice, painful, unresponsive), pediatric Glasgow Coma Scale (eye opening, motor response, verbal response), pupil response to light (normal, pinpoint, dilated, unilateral dilated), blood glucose test (low blood sugar / hypoglycemia can cause altered mental status)
Exposure - assess temperature/ fever, signs of trauma (cuts, bleeding, bruises, burns, etc.), skin (petechiae, purpura, etc.) [4] [5]
Once the primary assessment is completed, the provider can do a secondary assessment which consists of a complete physical exam and focused medical history. The information asked in the medical history uses the acronym SAMPLE - signs and symptoms, allergies, medications (prescribed, over the counter, vitamins, herbal), past medical history (any medical problems, prior surgeries), last meal (helpful information to know because it can affect when a child can have surgery or receive anesthesia), events (onset of illness and events leading up to illness).[ citation needed ]
Parts of the history that are especially important for children include asking about medications that the child could have gotten into (e.g., if a pill fell on the floor or an unlocked medicine cabinet), history of prematurity, birth history, and immunizations. [4]
Providers must be able to identify respiratory problems that are easily treatable (e.g., treated with oxygen, suctioning/ clearing airway, albuterol, etc.) and those that can rapidly progress to life-threatening conditions. Respiratory distress can progress to respiratory failure which can progress to cardiac arrest. Once respiratory complaints have progressed to cardiac arrest, death and neurological damage are more likely to occur. For this reason, providers should aim to identify and treat respiratory conditions before they progress and worsen. [4]
Common signs of respiratory distress
Respiratory distress can progress and worsen to respiratory failure. Signs of respiratory failure include the following
The initial management for respiratory distress uses the acronym ABC - airway, breathing, circulation.
Airway
Breathing
Circulation
Advanced airways may be necessary if the child can't maintain their airway on their own and isn't responding to other methods of ventilation and oxygenation. Advanced airways use medical equipment to allow for open airways and ease of ventilation and medication delivery. Types of advanced airways include supraglottic devices (devices that lie above the glottis such as OPA, NPA, laryngeal mask airway), infraglottic devices (devices that lie below the glottis and go into the trachea such as endotracheal tube (intubation)), and surgery (incision below the glottis such as cricothyrotomy and tracheotomy). Surgical advanced airways are typically performed when intubation and other less invasive methods fail or are contraindicated or when the child will need long term mechanical ventilation. [4] [3] [5]
To perform an intubation, the health care provider should be able to perform the steps of rapid sequence intubation (preparation, preoxygenation, pretreatment, paralysis and sedation, positioning, placement of tube, postintubation management). [5]
Further management should be based on the specific medical condition the child has. For example, if the child is experiencing respiratory distress secondary to asthma, management would include albuterol, inhaled corticosteroids, supplemental oxygen, and more depending upon the severity of the asthma. [4]
Shock is defined as inadequate blood flow (perfusion) in the body, causing tissues and organs to (1) not get enough oxygen and nutrients and (2) have trouble getting rid of toxic products of metabolism (e.g., lactate). It is important to recognize and treat shock as early as possible because the body requires oxygen and nutrients to function and without them, organs can eventually shut down and people can die. [3] Common signs of shock include weak pulses, altered mental status, bradycardia or tachycardia, low urine output, hypotension, and pale, cold skin. [6] Treating shock focuses on increasing blood flow and oxygen delivery to tissues and organs before organs are permanently damaged. [4] This section will discuss the recognition and management of shock.
The severity of shock is typically based on systolic blood pressure. For this reason, measuring blood pressure is an important way to assess shock; however, blood pressure machines may not be very accurate if pulses are weak and the arms and legs (where the blood pressure is measured) are poorly perfused.
Compensated shock is when the body is able to compensate through various mechanisms (e.g., raising the heart rate, increasing systemic vascular resistance, and more) to keep the systolic blood pressure in a normal range.
Hypotensive/ decompensated shock is when the body cannot maintain systolic blood pressure in the normal range, and it becomes too low (hypotensive). [4]
age | systolic blood pressure |
---|---|
0-1 month old | < 60 mmHg |
1–12 months old | < 70 mmHg |
1–10 years old | 5th percentile: < 70 mmHg + [child's age in years x2] mmHg |
> 10 years old | < 90 mmHg |
There are 4 main types of shock: hypovolemic, distributive, cardiogenic, and obstructive.
Hypovolemic shock is caused by low blood volume (hypovolemia) and is the most common cause of shock in pediatric patients. Common causes of volume loss include diarrhea, vomiting, hemorrhage, not drinking enough, burns, osmotic diuresis (e.g., diabetic ketoacidosis), and third space losses. [4] Signs of hypovolemic shock are related to the low blood volume and decreased blood flow to extremities (e.g., cold extremities, slow capillary refill, and weak distal pulses). [7]
Distributive shock is caused by abnormally distributed blood throughout the body which causes some parts of the body to receive inadequate blood supply. Common causes of distributive shock include sepsis, anaphylaxis, and head or spinal cord injury (neurogenic shock). [4]
Cardiogenic shock is caused by abnormal heart function or problems within the heart that impair pumping of blood within the heart. Common causes of cardiogenic shock include congenital heart diseases, arrhythmias, myocarditis (inflammation of the heart muscle), cardiomyopathy (impairment of the heart's ability to pump), trauma/injury of the heart, drug or poison toxicity. [4] Common signs include tachycardia, distant pulses, and worsening with giving fluids. [6]
Obstructive shock is caused by disrupted flow of blood to the heart or flow of blood out of the heart. Common causes include tension pneumothorax, cardiac tamponade, pulmonary embolism, and ductal dependent congenital heart defects (conditions that worsen when the ductus arteriosus closes after birth) (e.g., hypoplastic left heart syndrome and coarctation of the aorta). [4]
Management of shock should be based on the type of shock. When the type of shock hasn't been identified yet, the provider should start with some initial treatments and labs. All children with suspected shock should receive supplemental oxygen, ventilation if in respiratory distress (via nasal canula, high flow nasal canula, noninvasive ventilation, or mechanical ventilation), and treatment for life-threatening conditions. Providers should establish vascular access (intravenous access [2 peripheral IVs with a large caliber needle] and if that isn't possible, intraosseous access (IO) or central venous line). Providers should also obtain initial lab studies including a rapid blood glucose, basic metabolic panel (BMP) (measures serum electrolytes, blood urea nitrogen, and creatinine), lactic acid level, complete blood count (CBC), and urine dipstick. [7]
The provider should start crystalloid fluids (normal saline or lactated Ringers). For compensated shock give 10-20 ml/kg over 5-20 min and for hypotensive shock, give 20 ml/lg over 5-10 min. However, if there are signs that the patient has too much fluid (fluid overload) such as worsening respiratory distress, jugular venous distention, crackles, hepatomegaly, then fluids should not be given. With continued signs of shock and no signs of fluid overload, kids can continue to receive 10-20 ml/kg of fluids with a max of 60 ml/kg in the first hour. However, if cardiogenic shock is suspected, kids should receive less fluids over a longer time (e.g., 5-10 ml/kg over 15-30 min). [6]
Hypovolemic shock is mainly treated with fluid replacement, as described in the fluids section above. If the hypovolemic shock is caused by a hemorrhage, then the provider should obtain blood type, blood cross match, and coagulation studies (PT, INR, PTT). In hemorrhagic shock, patients should receive blood or blood products if they aren't improving with fluids. [6]
Distributive shock is mainly treated with fluid replacement, as described in the fluids section above, and vasopressors. For those with suspected septic shock, providers should obtain blood culture, urinalysis, urine culture, c-reactive protein (CRP) (marker of inflammation), procalcitonin (marker of inflammation), fibrinogen, D-dimer, bilirubin labs, and more. Those in anaphylactic shock should be treated with intramuscular epinephrine. [6]
Cardiogenic shock typically worsens with fluids. Providers should obtain an ECG and echocardiogram for patients suspected to have cardiogenic shock. Treatment can include vasopressors, inotropes, and treatment of any arrhythmias. [6]
Obstructive shock is treated by treating the underlying cause of the shock. Tension pneumothorax is treated with a chest tube and needle thoracostomy which allows the air to get out of the pleural space. Cardiac tamponade is treated with pericardiocentesis which removes the fluid from the pericardium and decompresses the heart. Pulmonary embolism is treated with anticoagulants (prevent body from making more clots) and if bad enough, thrombectomy (surgical removal of clots). Ductal dependent congenital heart defects are treated with prostaglandin E1/ alprostadil which keeps the ductus arteriosus open. [6]
Cardiac arrest occurs when the heart stops working and blood stops moving throughout the body. [8]
In infants and children, cardiac arrest is typically caused by (1) hypoxic/asphyxial arrest and less commonly by (2) sudden cardiac arrest due to heart problems or arrhythmias. In adults, cardiac arrest is usually caused by heart problems such as acute coronary syndrome. Hypoxic/asphyxial cardiac arrest is a result of progressive respiratory failure and/or shock. For this reason, it is important to treat respiratory failure and shock early so that they don't progress to cardiac arrest.
Sudden cardiac arrest is typically caused by arrhythmias such ventricular fibrillation (VF) and pulseless ventricular tachycardia (pVT). These arrhythmias are more common in kids with hypertrophic cardiomyopathy, cardiac channelopathies (e.g., long QT syndrome), myocarditis, drugs (e.g., cocaine, digoxin), commotio cordis, and anomalous coronary artery. [4]
There are many causes of reversible cardiac arrest and the mnemonic "H's and T's" is used to remember these causes.
H's | T's |
---|---|
hypoxia | trauma |
hypovolemia | toxins |
hydrogen ions (acidosis) | tension pneumothorax |
hypoglycemia | thrombosis (clot in lungs and heart) |
hypothermia | tamponade (cardiac) |
hypo/hyperkalemia |
Signs of cardiac arrest include no pulse (within 10 seconds), no breathing or only gasping, and unresponsiveness. As mentioned above, cardiac arrest in kids is mainly a result of respiratory failure and shock, so providers need to treat those conditions quickly and be on the look out for signs of cardiac arrest. Because cardiac arrest can also be caused by arrhythmias, providers should get ECGs of these patients. The 4 main cardiac arrest rhythms are ventricular fibrillation (VF), pulseless ventricular tachycardia (pVT), asystole, and pulseless electrical activity (PEA).
Treatment of pediatric cardiac arrest follows the American Heart Association's (AHA) Pediatric Cardiac Arrest Algorithm. The goals of treatment are to obtain return of spontaneous circulation (ROSC), meaning that the heart starts working on its own. [4]
Once cardiac arrest is recognized, high quality CPR needs to be started immediately. After starting chest compressions, the provider should (1) give ventilations (via bag mask) and oxygen, (2) attach monitor/defibrillator pads or ECG electrodes to the child so that defibrillations (aka shocks) can be given if needed, and (3) establish vascular access (IV, IO). Attaching the defibrillator and establishing vascular access should NOT interrupt chest compressions.
Once the monitor/defibrillator is connected, the provider should assess the heart rhythm. Of the 4 cardiac arrest rhythms, VF and pVT are shockable rhythms and asystole and PEA are unshockable rhythms. Shockable rhythms are rhythms that can improve with a shock and thus, should receive a shock. Unshockable rhythms are rhythms that won't improve with a shock and thus, should NOT receive a shock. The monitor/defibrillator will either tell the providers if the rhythm is shockable (automated external defibrillators (AED)) or the providers will be able to read the ECG and determine for themselves if the rhythm is shockable (manual defibrillators). If shockable, give a shock then resume CPR. If not shockable, continue CPR, give epinephrine, and consider an advanced airway.
After every 2 minutes of giving CPR the provider should reassess the patient's heart rhythm to see if it is shockable or unshockable, and give a shock if it is shockable. This 2 minute cycle of CPR and rhythm assessment should continue until it is determined by the providers that further management is unlikely to save the patient. For patients with shockable rhythms who haven't achieved ROSC, providers can give epinephrine after 2 shocks and amiodarone or lidocaine after 3 shocks. Throughout CPR and rhythm assessments, the providers should be treating any suspected reversible causes of cardiac arrest (H's and T's listed above). [2]
Defibrillations/shocks
Medicines that can be given during treatment of cardiac arrest are listed below. The doses listed below are for IV/IO medicationa. Medications via endotracheal tube (ET) are often given at higher doses. [4]
PALS providers should be able to identify and treat different types of abnormal pediatric heart rhythms including bradyarrhythmias, tachyarrhythmias, and cardiac arrest rhythms (discussed above). In defining heart rates that are too slow or too fast, it is important to understand the ranges of pediatric heart rates by age. Normal ranges of pediatric heart rates change with age, with heart rates being faster closer to birth and slower closer to adulthood. [4]
Bradycardia is defined as a slow heart rate for a child's age. Bradycardia associated with signs of shock (altered mental status, hypotension, etc.) can be an early warning sign for cardiac arrest. Signs of bradycardia include fatigue, confusion, dizziness, and lightheadedness. [4] Possible causes of bradycardia include hypoxia, hypothermia, and certain medications. [2]
Types of bradyarrhythmias
Providers should follow the AHA's Pediatric Bradycardia With a Pulse Algorithm. As always, provides need to support airway, breathing, and circulation and begin CPR if needed. Bradyarrythmias with signs of shock can be treated with epinephrine and atropine in order to increase heart rate. If medications aren't helping, providers can consider cardiac pacing.
Tachycardia is defined as a fast heart rate for a child's age. Signs of tachycardia are similar to bradycardia but also include palpitations, decreased feeding/eating, and irritability. Tachyarrhythmias are fast abnormal heart rhythms. [5]
Types of tachyarrhythmias
Providers should follow the AHA's Pediatric Tachycardia With a Pulse Algorithm. As always, provides need to support airway, breathing, and circulation and begin CPR if needed. Management of tachyarrhythmias depends on if the child is stable or unstable (experiencing cardiopulmonary compromise: signs of shock, hypotension, altered mental status).
Unstable tachyarrhythmia is treated with synchronized cardioversion - initially 0.5-1 J/kg but can increase to 2 J/kg if smaller dose is not working.
Stable tachyarrhythmia treatment is subcategorized based on narrow QRS vs. wide QRS. If narrow QRS/ SVT, perform vagal maneuvers and give adenosine. If wide QRS/ VT with regular rhythm and monomorphic QRS, the provider can give adenosine and should consult pediatric cardiology for recommendations.
PETA has criticized the use of animals in PALS training which the organization calls "cruel and unnecessary". [9] PETA says that hundreds of PALS training centers have begun using simulators in response to concerns regarding the animals' welfare. [9] The American Heart Association neither endorses nor requires the use of animals in intubation training. [10]
Bradycardia, also called bradyarrhythmia, is a resting heart rate under 60 beats per minute (BPM). While bradycardia can result from various pathologic processes, it is commonly a physiologic response to cardiovascular conditioning or due to asymptomatic type 1 atrioventricular block.
First aid is the first and immediate assistance given to any person with either a minor or serious illness or injury, with care provided to preserve life, prevent the condition from worsening, or to promote recovery until medical services arrive. First aid is generally performed by someone with basic medical or first response training. Mental health first aid is an extension of the concept of first aid to cover mental health, while psychological first aid is used as early treatment of people who are at risk for developing PTSD. Conflict first aid, focused on preservation and recovery of an individual's social or relationship well-being, is being piloted in Canada.
Cardiac arrest, also known as sudden cardiac arrest (SCA), is when the heart suddenly and unexpectedly stops beating. When the heart stops beating, blood cannot properly circulate around the body and the blood flow to the brain and other organs is decreased. When the brain does not receive enough blood, this can cause a person to lose consciousness and brain cells can start to die due to lack of oxygen. Coma and persistent vegetative state may result from cardiac arrest. Cardiac arrest is also identified by a lack of central pulses and abnormal or absent breathing.
Cardiopulmonary resuscitation (CPR) is an emergency procedure consisting of chest compressions often combined with artificial ventilation, or mouth to mouth in an effort to manually preserve intact brain function until further measures are taken to restore spontaneous blood circulation and breathing in a person who is in cardiac arrest. It is recommended for those who are unresponsive with no breathing or abnormal breathing, for example, agonal respirations.
Cardioversion is a medical procedure by which an abnormally fast heart rate (tachycardia) or other cardiac arrhythmia is converted to a normal rhythm using electricity or drugs. Synchronized electrical cardioversion uses a therapeutic dose of electric current to the heart at a specific moment in the cardiac cycle, restoring the activity of the electrical conduction system of the heart. Pharmacologic cardioversion, also called chemical cardioversion, uses antiarrhythmia medication instead of an electrical shock.
Shock is the state of insufficient blood flow to the tissues of the body as a result of problems with the circulatory system. Initial symptoms of shock may include weakness, fast heart rate, fast breathing, sweating, anxiety, and increased thirst. This may be followed by confusion, unconsciousness, or cardiac arrest, as complications worsen.
Defibrillation is a treatment for life-threatening cardiac arrhythmias, specifically ventricular fibrillation (V-Fib) and non-perfusing ventricular tachycardia (V-Tach). A defibrillator delivers a dose of electric current to the heart. Although not fully understood, this process depolarizes a large amount of the heart muscle, ending the arrhythmia. Subsequently, the body's natural pacemaker in the sinoatrial node of the heart is able to re-establish normal sinus rhythm. A heart which is in asystole (flatline) cannot be restarted by a defibrillator; it would be treated only by cardiopulmonary resuscitation (CPR) and medication, and then by cardioversion or defibrillation if it converts into a shockable rhythm.
Asystole is the absence of ventricular contractions in the context of a lethal heart arrhythmia. Asystole is the most serious form of cardiac arrest and is usually irreversible. Also referred to as cardiac flatline, asystole is the state of total cessation of electrical activity from the heart, which means no tissue contraction from the heart muscle and therefore no blood flow to the rest of the body.
An automated external defibrillator or automatic electronic defibrillator (AED) is a portable electronic device that automatically diagnoses the life-threatening cardiac arrhythmias of ventricular fibrillation (VF) and pulseless ventricular tachycardia, and is able to treat them through defibrillation, the application of electricity which stops the arrhythmia, allowing the heart to re-establish an effective rhythm.
Basic life support (BLS) is a level of medical care which is used for patients with life-threatening condition of cardiac arrest until they can be given full medical care by advanced life support providers. It can be provided by trained medical personnel, such as emergency medical technicians, qualified bystanders and anybody who is trained for providing BLS and/or ACLS.
Ventricular tachycardia is a cardiovascular disorder in which fast heart rate occurs in the ventricles of the heart. Although a few seconds of VT may not result in permanent problems, longer periods are dangerous; and multiple episodes over a short period of time are referred to as an electrical storm. Short periods may occur without symptoms, or present with lightheadedness, palpitations, shortness of breath, chest pain, and decreased level of consciousness. Ventricular tachycardia may lead to coma and persistent vegetative state due to lack of blood and oxygen to the brain. Ventricular tachycardia may result in ventricular fibrillation (VF) and turn into cardiac arrest. This conversion of the VT into VF is called the degeneration of the VT. It is found initially in about 7% of people in cardiac arrest.
Respiratory arrest is a serious medical condition caused by apnea or respiratory dysfunction severe enough that it will not sustain the body. Prolonged apnea refers to a patient who has stopped breathing for a long period of time. If the heart muscle contraction is intact, the condition is known as respiratory arrest. An abrupt stop of pulmonary gas exchange lasting for more than five minutes may permanently damage vital organs, especially the brain. Lack of oxygen to the brain causes loss of consciousness. Brain injury is likely if respiratory arrest goes untreated for more than three minutes, and death is almost certain if more than five minutes.
Pulseless electrical activity (PEA) is a form of cardiac arrest in which the electrocardiogram shows a heart rhythm that should produce a pulse, but does not. Pulseless electrical activity is found initially in about 20% of out-of-hospital cardiac arrests and about 50% of in-hospital cardiac arrests.
Advanced Life Support (ALS) is a set of life saving protocols and skills that extend basic life support to further support the circulation and provide an open airway and adequate ventilation (breathing).
ABC and its variations are initialism mnemonics for essential steps used by both medical professionals and lay persons when dealing with a patient. In its original form it stands for Airway, Breathing, and Circulation. The protocol was originally developed as a memory aid for rescuers performing cardiopulmonary resuscitation, and the most widely known use of the initialism is in the care of the unconscious or unresponsive patient, although it is also used as a reminder of the priorities for assessment and treatment of patients in many acute medical and trauma situations, from first-aid to hospital medical treatment. Airway, breathing, and circulation are all vital for life, and each is required, in that order, for the next to be effective: a viable Airway is necessary for Breathing to provide oxygenated blood for Circulation. Since its development, the mnemonic has been extended and modified to fit the different areas in which it is used, with different versions changing the meaning of letters or adding other letters.
The history of cardiopulmonary resuscitation (CPR) can be traced as far back as the literary works of ancient Egypt. However, it was not until the 18th century that credible reports of cardiopulmonary resuscitation began to appear in the medical literature.
The following outline is provided as an overview of and topical guide to cardiology, the branch of medicine dealing with disorders of the human heart. The field includes medical diagnosis and treatment of congenital heart defects, coronary artery disease, heart failure, valvular heart disease and electrophysiology. Physicians who specialize in cardiology are called cardiologists.
The Hs and Ts is a mnemonic used to aid in remembering the possible reversible causes of cardiac arrest. A variety of disease processes can lead to a cardiac arrest; however, they usually boil down to one or more of the "Hs and Ts".
Arrhythmias, also known as cardiac arrhythmias, are irregularities in the heartbeat, including when it is too fast or too slow. A resting heart rate that is too fast – above 100 beats per minute in adults – is called tachycardia, and a resting heart rate that is too slow – below 60 beats per minute – is called bradycardia. Some types of arrhythmias have no symptoms. Symptoms, when present, may include palpitations or feeling a pause between heartbeats. In more serious cases, there may be lightheadedness, passing out, shortness of breath, chest pain, or decreased level of consciousness. While most cases of arrhythmia are not serious, some predispose a person to complications such as stroke or heart failure. Others may result in sudden death.
Rearrest is a phenomenon that involves the resumption of a lethal cardiac dysrhythmia after successful return of spontaneous circulation (ROSC) has been achieved during the course of resuscitation. Survival to hospital discharge rates are as low as 7% for cardiac arrest in general and although treatable, rearrest may worsen these survival chances. Rearrest commonly occurs in the out-of-hospital setting under the treatment of health care providers.