What are the 5 Hs and Ts
Mia Russell
Published Apr 21, 2026
Rapidly identify and treat causes of non-shockable arrest (PEA, asystole). Important causes include the 5 H’s and 5 T’s: Hypoxia, Hypovolemia, Hydrogen ions (acidosis), Hyper/Hypo-kalemia, Hypothermia; Tension pneumothorax, Tamponade-cardiac, Toxins, Thrombosis-coronary (MI), Thrombosis-pulmonary (PE).
What are the five H's?
The Five Ws, Five Ws and one H, or the Six Ws are questions whose answers are considered basic in information-gathering. They include Who, What, When Where, and Why.
Which is one of the Hs and Ts that represent?
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”.
What are the 4 Hs and 4 Ts?
However, in practice while performing CPR often in stressful situations, it is difficult to remember all 4 “Ts” and 4 “Hs” causes (hypoxia, hypokalaemia/hyperkalaemia, hypothermia/hyperthermia, hypovolaemia, tension pneumothorax, tamponade, thrombosis, toxins), especially for medical students, young doctors and doctors …How many H's and T's are there?
The H’s and T’s are 12 reversible conditions, 7 that start with H and 5 that start with T. While it is important to continue to deliver compressions, ventilation, and medications according to the algorithm, it is always best to treat underlying causes of PEA and related conditions as soon as possible.
What are the 5 H's and 5 T's of ACLS?
Rapidly identify and treat causes of non-shockable arrest (PEA, asystole). Important causes include the 5 H’s and 5 T’s: Hypoxia, Hypovolemia, Hydrogen ions (acidosis), Hyper/Hypo-kalemia, Hypothermia; Tension pneumothorax, Tamponade-cardiac, Toxins, Thrombosis-coronary (MI), Thrombosis-pulmonary (PE).
What are the 6 H's?
- Hypovolemia. Hypovolemia or the loss of fluid volume in the circulatory system can be a major contributing cause of cardiac arrest. …
- Hypoxia. …
- Hydrogen ion (acidosis) …
- Hyper-/hypokalemia. …
- Hypoglycemia. …
- Hypothermia. …
- Toxins. …
- Tamponade.
What is Pea in ACLS?
Pulseless electrical activity (PEA) and asystole are related cardiac rhythms in that they are both life-threatening and unshockable cardiac rhythms.What does AED stand for?
Automated external defibrillators (AEDs) are portable, life-saving devices designed to treat people experiencing sudden cardiac arrest, a medical condition in which the heart stops beating suddenly and unexpectedly.
Can you do CPR on asystole?Asystole is treated by cardiopulmonary resuscitation (CPR) combined with an intravenous vasopressor such as epinephrine (a.k.a. adrenaline). Sometimes an underlying reversible cause can be detected and treated (the so-called “Hs and Ts”, an example of which is hypokalaemia).
Article first time published onHow do you ace ACLS?
- Review ACLS Case Scenarios. …
- Memorize the ACLS Algorithms. …
- Memorize Meds and Proper Dosages. …
- Know Your H’s and T’s. …
- Understand Basic Electrocardiography. …
- Take Multiple Practice Exams. …
- Skip the Hard Questions at First. …
- Take Your Time.
What are the three H's?
The Three H’s of Practicing: Head, Heart, Hands : Interlude. On the most basic level, we practice to get better, to become proficient, to ensure we never play a wrong note.
What are shockable rhythms?
Shockable rhythms are rhythms that are caused by an aberration in the electrical conduction system of the heart.
What is a chest compression fraction?
The chest compression fraction was defined as the proportion of resuscitation time without spontaneous circulation during which chest compressions were administered.
What does BLS stand for?
Basic Life Support, or BLS, generally refers to the type of care that first-responders, healthcare providers and public safety professionals provide to anyone who is experiencing cardiac arrest, respiratory distress or an obstructed airway.
Why is early defibrillation so important?
Defibrillation reverses the cardiac arrest by sending an electrical current through the heart muscle cells, momentarily stopping the abnormal electrical energy and allowing the normal heart beat to resume. … Greater than 50-70% of Sudden Cardiac Arrest victims survive if defibrillation occurs within the first 5 minutes.
Do you defib asystole?
Asystole is a non-shockable rhythm. Therefore, if asystole is noted on the cardiac monitor, no attempt at defibrillation should be made. High-quality CPR should be continued with minimal (less than five seconds) interruption.
Is V fib a form of pea?
Approximately 300,000 out-of-hospital cardiac arrests (OHCA) occur annually in the United States, with a survival of around 8%. The initial rhythm may be ventricular fibrillation (VF), pulseless ventricular tachycardia (VT), asystole, or pulseless electrical activity (PEA).
Why use epinephrine in peas?
Epinephrine is primarily used for its vasoconstrictive effects. Vasoconstriction is important during CPR because it will help increase blood flow to the brain and heart. When treating PEA, epinephrine can be given as soon as possible but its administration should not delay the initiation or continuation of CPR.
Can you defib a flat line?
Pulseless electrical activity and asystole or flatlining (3 and 4), in contrast, are non-shockable, so they don’t respond to defibrillation. These rhythms indicate that the heart muscle itself is dysfunctional; it has stopped listening to the orders to contract.
What do you give for V tach with a pulse?
In a pulseless patient, begin immediate CPR and attach AED or external defibrillator. If Vtach or Vfib, prepare for defibrillation. If pulse is present, attach EKG or defibrillator and evaluate rhythm.
Can you survive a flatline?
In the movies, they sometimes shock a flatlined heart with a defibrillator. That’s a machine that uses an electric pulse to get your heartbeat back to normal. But it doesn’t usually help in real life. Typically, less than 2% of people survive asystole.
What's the difference between ACLS and BLS?
What is the difference between BLS and ACLS? Basic Life Support (BLS) is the generic term for any form of CPR and is required for all registered nurses. Advanced Cardiac Life Support (ACLS) is primarily required for RNs who work in a hospital setting and care for critically ill adults.
How many ACLS algorithms are there?
Here’s What’s Inside the Course There are four primary ACLS algorithms in this ACLS training which include the Cardiac Arrest Algorithm, Bradycardia Algorithm, Tachycardia Algorithm, and the Post-Cardiac Arrest Algorithm.
How many questions are on the ACLS written exam?
What to expect for the written test: The ProACLS written test has about 50 multiple-choice questions. The written test is also required and typically takes an hour of time to complete. The passing score for the written test is 85% or higher.
What rhythms does AED shock?
AEDs advise a shock only to ventricular fibrillation and fast ventricular tachycardia. The electric current is delivered through the victim’s chest wall through adhesive electrode pads.
Is defibrillation the same as cardioversion?
There is an important distinction between defibrillation and cardioversion: Defibrillation — Defibrillation is the asynchronous delivery of energy, such as the shock is delivered randomly during the cardiac cycle. Cardioversion — Cardioversion is the delivery of energy that is synchronized to the QRS complex.
Does AED detect pulse?
An AED will automatically analyse the heart rhythm of a pulse less victim and, if the victim is in ventricular fibrillation (VF) or ventricular tachycardia (VT), shock the victim’s heart in an attempt to restore its rhythm to normal.
What are the 4 components of high-quality CPR?
Five main components of high-performance CPR have been identified: chest compression fraction (CCF), chest compression rate, chest compression depth, chest recoil (residual leaning), and ventilation. These CPR components were identified because of their contribution to blood flow and outcome.
What are the 7 steps of CPR?
The seven steps of CPR (cardiopulmonary resuscitation) involve checking the scene and the person, calling 911 for assistance, opening the airway, checking for breathing, chest compressions, delivering rescue breaths, and repeating CPR steps.
What is CCF in BLS?
CCF is the amount of time during a cardiac arrest event that high-quality chest compressions are performed. Improving CCF to achieve the 80% threshold has been shown to increase survival by 200% to 300%.