Which rhythm is described as a flatline on the monitor with no blood flow?

• A. Pulseless ventricular tachycardia
• B. Ventricular fibrillation
• C. Asystole
• D. Normal sinus rhythm

Answer: (C)

Asystole is a flatline on the monitor, indicating there is no electrical activity in the heart. Without electrical signals, the heart doesn’t contract, so there is no cardiac output and no blood flow to the brain or other vital organs. In pediatric cardiac arrest, this means the priority is immediate high-quality CPR to circulate oxygenated blood and to buy time for reversible causes to be addressed, along with medications like epinephrine. Defibrillation isn’t used here because there’s no chaotic or organized electrical rhythm to interrupt; you’re not shocking a rhythm that could be converted to a perfusing heartbeat. Keep in mind to verify leads if readings are uncertain and to focus on treating potential reversible factors such as hypoxia, hypovolemia, acidosis, toxins, and similar causes.