Life-Threatening Arrhythmias Flashcards

A CRAT is alerted to a patient who is unresponsive and has no palpable pulse. The cardiac monitor, however, displays an organized, narrow-complex rhythm at a rate of 70 bpm. This clinical situation is best described as:

Answer: Pulseless Electrical Activity (PEA)

Pulseless Electrical Activity (PEA) is a life-threatening condition defined by the presence of an organized or semi-organized electrical rhythm on the ECG monitor in a patient who lacks a palpable pulse. [2, 9] The heart's electrical system is functioning, but it is not generating mechanical contractions sufficient to produce a pulse and circulate blood.

An ECG strip shows an extremely slow, irregular rhythm with wide, bizarrely shaped QRS complexes at a rate of less than 20 bpm. No discernible P waves are present. This rhythm is characteristic of:

Answer: Agonal Rhythm

An agonal rhythm, often called a "dying heart," is a terminal arrhythmia characterized by a very slow (often <20 bpm), irregular rate with wide and misshapen QRS complexes. [1, 3, 17] It represents the last electrical discharges from the ventricles and is a sign of impending or current cardiac arrest.

A technician at a central monitoring station observes a patient's rhythm abruptly change to coarse Ventricular Fibrillation. What is the most critical and immediate action for the technician to take?

Answer: Activate the facility's emergency response system (e.g., call a "Code Blue").

Ventricular Fibrillation is a lethal arrhythmia requiring immediate defibrillation. [27, 28, 31] The CRAT's primary responsibility is to recognize the rhythm and immediately activate the emergency response system to bring the resuscitation team and defibrillator to the patient's bedside as quickly as possible.

A CRAT observes a straight, flat line on a patient's cardiac monitor. The patient was previously in sinus rhythm. What is the technician's most appropriate initial action?

Answer: Quickly check for loose leads or patient disconnection.

While a flat line can represent true asystole, it is frequently caused by technical issues such as lead disconnection, incorrect lead selection, or low signal gain. [20, 21, 26] Before activating an emergency response, the technician must perform a rapid check of the equipment to rule out technical error. This is a crucial step in preventing false alarms.

A CRAT identifies a sustained, wide-complex tachycardia at a rate of 170 bpm on a patient's monitor. To help the clinical team determine the urgency of intervention, which associated patient finding is the most critical to report?

Answer: The patient's blood pressure and level of consciousness.

The immediate management of Ventricular Tachycardia depends entirely on whether the patient is hemodynamically stable or unstable. [12, 14, 18] Key indicators of instability include hypotension (low blood pressure), altered mental status (confusion, loss of consciousness), signs of shock, and acute chest pain. This information dictates whether the patient requires immediate electrical cardioversion versus medical management.

Which of the following cardiac arrest rhythms is considered "non-shockable" and is characterized by a total absence of discernible electrical activity on the ECG?

Answer: Asystole

Asystole, often called "flatline," is the cessation of all electrical activity in the heart. [4, 7, 10] It is a non-shockable rhythm because there is no electrical chaos to reset; the goal of treatment is to restart electrical activity through high-quality CPR and medications like epinephrine. Ventricular Fibrillation and Pulseless Ventricular Tachycardia are shockable rhythms.