NREMT Paramedic Level Flashcards: Cardiac Assessment And Ecg Interpretation

What this deck covers

This deck focuses on Cardiac Assessment And Ecg Interpretation, giving you a quick way to review the definitions, rules, and examples that matter most for NREMT Paramedic Level.

How to use these flashcards

Work through these flashcards in short sessions. Try to answer each prompt before flipping the card, then revisit any cards you miss until the explanation feels automatic.

Flashcard 1: Which leads are considered lateral leads on a standard 12-lead ECG?

Answer: I, aVL, V5, and V6. Lateral leads monitor the left ventricular lateral wall, supplied by left circumflex artery, aiding in lateral infarction identification.

Flashcard 2: What is the normal PR interval range on an adult ECG?

Answer: $0.12$ to $0.20$ s (120–200 ms). This range represents normal atrioventricular conduction time, allowing atrial depolarization to precede ventricular activation without delay.

Flashcard 3: What is the correct precordial lead placement location for V3?

Answer: Midway between V2 and V4. V3 is located equidistant between V2 and V4 to bridge septal and anterior views, providing transitional precordial lead information.

Flashcard 4: What is the normal adult QRS duration on an ECG?

Answer: < $0.12$ s (typically $0.06$–$0.10$ s). Normal QRS duration reflects efficient intraventricular conduction, with values under $0.12$ s indicating no bundle branch block or other delays.

Flashcard 5: What is the correct precordial lead placement location for V2?

Answer: 4th intercostal space, left sternal border. V2 is positioned at the left sternal border in the fourth intercostal space to monitor the septum and left ventricle, ensuring proper 12-lead ECG interpretation.

Flashcard 6: What ECG finding defines second-degree AV block Mobitz II?

Answer: Constant PR with intermittent nonconducted P waves. Stable PR interval with sudden conduction failure suggests infranodal block, often requiring intervention due to risk of progression to complete block.

Flashcard 7: What is the ECG criterion for first-degree AV block?

Answer: PR interval > $0.20$ s with $1:1$ conduction. Prolonged PR interval indicates delayed AV nodal conduction, but consistent P-QRS relationship maintains 1:1 atrioventricular synchrony.

Flashcard 8: What is the formula to estimate heart rate from R-R interval in seconds?

Answer: Heart rate = rac{60}{R-R(s)}. Dividing 60 by the R-R interval in seconds provides an accurate ventricular rate estimation for irregular rhythms on ECG.

Flashcard 9: Identify the likely diagnosis when ST elevation is present in II, III, and aVF.

Answer: Inferior STEMI. Elevation in inferior leads suggests occlusion of the right coronary artery, affecting the inferior left ventricular wall.

Flashcard 10: What ST-elevation threshold in contiguous limb leads suggests STEMI?

Answer: ST elevation ≥ $1$ mm (≥ $0.1$ mV) in ≥ $2$ contiguous leads. This criterion indicates acute myocardial injury in limb leads, prompting urgent reperfusion therapy for suspected STEMI.

Flashcard 11: What is the normal QTc upper limit for adult males on a 12-lead ECG?

Answer: QTc ≤ $0.44$ s. The upper limit for corrected QT interval in males accounts for heart rate normalization, preventing misdiagnosis of prolonged QT syndromes.

Flashcard 12: What ECG finding defines second-degree AV block Mobitz I (Wenckebach)?

Answer: Progressive PR prolongation until a dropped QRS. Wenckebach pattern shows incremental AV nodal fatigue, leading to a nonconducted P wave and cycle reset, typically benign and vagally mediated.

Flashcard 13: What is the correct precordial lead placement location for V1?

Answer: 4th intercostal space, right sternal border. Standard placement for V1 views the right ventricle and septum from the right sternal border at the fourth intercostal space to capture accurate anterior cardiac electrical activity.

Flashcard 14: Which leads are considered septal leads on a standard 12-lead ECG?

Answer: V1 and V2. Septal leads V1-V2 assess the interventricular septum, often involved in anteroseptal infarcts from left anterior descending artery occlusion.

Flashcard 15: Identify the likely diagnosis when ST elevation is present in V1 through V4.

Answer: Anterior (anteroseptal) STEMI. ST elevation across these leads indicates left anterior descending artery involvement, compromising anteroseptal myocardium.

Flashcard 16: What ECG criteria define left bundle branch block (LBBB)?

Answer: QRS ≥ $0.12$ s with broad R in I/V6 and deep S in V1. Prolonged QRS with monophasic R in lateral leads and QS or deep S in right precordial leads reflects left bundle conduction delay.

Flashcard 17: What is the correct precordial lead placement location for V5?

Answer: Left anterior axillary line, level with V4. V5 at the anterior axillary line, horizontally aligned with V4, assesses the lateral wall of the left ventricle for comprehensive ECG coverage.

Flashcard 18: What is the correct precordial lead placement location for V4?

Answer: 5th intercostal space, left midclavicular line. V4 placement at the fifth intercostal space in the midclavicular line targets the anterior left ventricle for detecting ischemia or infarction in that region.

Flashcard 19: Which leads are considered inferior leads on a standard 12-lead ECG?

Answer: II, III, and aVF. These leads view the inferior heart surface, corresponding to right coronary artery territory for detecting inferior wall abnormalities.

Flashcard 20: What is the normal QTc upper limit for adult females on a 12-lead ECG?

Answer: QTc ≤ $0.46$ s. Females have a slightly longer normal QTc due to physiological differences, with this limit aiding in identifying risks for arrhythmias like torsades de pointes.

Flashcard 21: What ECG criteria define right bundle branch block (RBBB)?

Answer: QRS ≥ $0.12$ s with rsR′ in V1 and wide S in I/V6. These features indicate delayed right bundle conduction, producing secondary R wave in right precordial leads and slurred S in left leads.

Flashcard 22: What is the correct precordial lead placement location for V6?

Answer: Left midaxillary line, level with V4. V6 in the midaxillary line at V4 level evaluates the low lateral left ventricular wall, completing the horizontal plane of precordial leads.

Flashcard 23: What ECG finding defines third-degree (complete) AV block?

Answer: AV dissociation with independent atrial and ventricular rates. Complete dissociation results from total AV conduction failure, causing independent atrial and ventricular rhythms, often necessitating pacing.

Flashcard 24: What ST-elevation threshold in contiguous precordial leads suggests STEMI?

Answer: ST elevation ≥ $2$ mm (≥ $0.2$ mV) in ≥ $2$ contiguous leads. Higher threshold in precordial leads accounts for normal variant elevations, ensuring specificity for diagnosing STEMI in chest leads.

Flashcard 25: Which leads are considered anterior leads on a standard 12-lead ECG?

Answer: V3 and V4. Anterior leads V3-V4 evaluate the anterior left ventricular wall, critical for diagnosing anterior myocardial infarction.