Cardiac Monitoring & Emergency Response Flashcards
7 cards from real CCT practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Cardiac Monitoring & Emergency Response flashcards as text
When applying electrodes for a 5-lead bedside monitoring system, where is the chest (C/V) electrode typically placed for the MCL1 equivalent?
Answer: Right sternal border, 4th intercostal space
The chest electrode placed at V1 position (right sternal border, 4th ICS) with lead III selected approximates the MCL1 monitoring lead.
ST-segment changes are measured from which reference point on the ECG?
Answer: The J point (end of QRS)
ST-segment elevation or depression is measured at the J point (junction between the end of the QRS complex and the beginning of the ST segment).
A patient with a known history of long QT syndrome is placed on telemetry. Which rhythm is this patient most at risk of developing?
Answer: Torsades de pointes
Long QT syndrome predisposes patients to early afterdepolarizations that can trigger torsades de pointes, a polymorphic ventricular tachycardia.
Which of the following best describes the correct action after identifying ventricular fibrillation on the monitor?
Answer: Begin CPR and prepare for unsynchronized defibrillation
VF is a pulseless rhythm requiring immediate CPR and unsynchronized defibrillation; no R wave exists to synchronize a shock.
A QRS complex that measures 0.14 seconds is best described as:
Answer: Prolonged, indicating bundle branch block
A QRS duration ≥0.12 seconds (120 ms) indicates intraventricular conduction delay such as bundle branch block; 0.14 s is clearly prolonged.
During a code, a patient in pulseless electrical activity (PEA) is being resuscitated. Which reversible cause should be considered related to cardiac tamponade?
Answer: Pericardial effusion compressing the heart
Cardiac tamponade (pericardial fluid accumulation) is one of the 'H's and T's' reversible causes of PEA and requires emergency pericardiocentesis.
Wenckebach (Mobitz type I) second-degree AV block is characterized by:
Answer: Progressive PR prolongation until a QRS is dropped, then reset
Mobitz type I block shows progressive PR interval lengthening with each cycle until one P wave fails to conduct, after which the PR interval resets to its shortest value.