A 55-year-old patient with a history of hypertension is undergoing a routine ECG as part of their annual check-up. The ECG reveals a first-degree AV block. Which of the following statements about first-degree AV block is correct?

First-degree AV block is characterized by a prolonged PR interval greater than 0.20 seconds.

First-degree AV block is a type of heart block where some atrial impulses fail to reach the ventricles.

Patients with first-degree AV block typically present with symptoms such as syncope or dizziness.

First-degree AV block often requires immediate treatment with a pacemaker.

Answer and Explanation

The Correct Answer is A

Rationale:

A. In first-degree atrioventricular (AV) block, all atrial impulses reach the ventricles, but conduction through the AV node is delayed. This delay is reflected on the ECG as a PR interval longer than 0.20 seconds, while the QRS complex remains normal. First-degree AV block is usually asymptomatic and often does not require treatment.

B. This description fits second-degree AV block, not first-degree. In first-degree block, no impulses are blocked, only delayed.

C. First-degree AV block is generally asymptomatic, and patients rarely experience symptoms. Symptoms such as syncope are more characteristic of higher-degree AV blocks.

D. Pacemaker therapy is not indicated for first-degree AV block unless it progresses to higher-degree AV block with symptomatic bradycardia. Immediate intervention is not needed in asymptomatic patients.

Nursing Test Bank

Test Bank #1: RN Pharmacology Exams Test Bank #2: RN Medical-Surgical Exams Test Bank #3: RN Fundamentals Exams Test Bank #4: RN Maternal-Newborn Exams Test Bank #5: RN Anatomy and Physiology Exams Test Bank #6: RN Obstetrics and Pediatrics Exams Test Bank #7: RN Fluid and Electrolytes Exams Test Bank #9: RN Adult Health Test Bank #10: RN Dosage Calculation Test Bank #11: RN Community Health Exams Test Bank #12: RN Psychology Exams Test Bank #13: RN Nursing Care Of Children Test Bank #14: RN Foundations of Nursing Exams

Get 100+ Naxlex Exit Exams for $79 Try Naxlex NCLEX-RN (14 Day Free-Trial)

Naxlex Comprehensive Predictor Exams

Exam #1: RN Comprehensive predictor 2023 proctored exam Exam #2: Ati rn vati comprehensive predictor proctored exam Exam #3: Ati Rn Comprehensive Predictor Proctored Exam 2023 Exam #4: Rn Comprehensive Predictor 2023 Proctored Exam - St. Joseph Exam #5: RN Comprehensive Predictor Proctored Exam (National U CA San Diego) Exam #6: Ati rn comprehensive predictor 2023 retake proctored exam Exam #7: RN Hesi Exit Proctored Exam Exam #8: Hesi RN Exit proctored exam Exam #9: Hesi rn exit proctored exam Exam #10: Hesi Rn compass exit B proctored exam

Free Nursing Study Resources

Correct Answer is D

Explanation

Rationale:

A. Amylase is an enzyme primarily elevated in pancreatic disorders such as pancreatitis, not myocardial infarction.

B. Unconjugated bilirubin is elevated in hemolysis or liver dysfunction. It is not a marker of myocardial injury.

C. AST can be elevated after myocardial infarction, but it is nonspecific because it is also found in liver, skeletal muscle, and kidneys. It rises later and is not the most sensitive early marker.

D. Troponin I is highly specific to cardiac muscle injury and increases within 3–6 hours after myocardial infarction, making it a primary early diagnostic marker. It remains elevated for 7–10 days, helping confirm myocardial injury.

A. "Cardiac enzymes will identify the location of the ML B. "These tests help determine the degree of damage to the heart tissues." C. "Cardiac enzymes assist in diagnosing the presence of pulmonary congestion D. "These tests will enable the provider to determine the heart structure and mobility of the heart valves."

Correct Answer is B

Explanation

Rationale:

A. Cardiac enzyme tests indicate myocardial injury but do not pinpoint the exact location of the infarct; imaging or ECG is required for localization.

B. Cardiac enzymes, such as troponin and creatine kinase-MB (CK-MB), are released into the bloodstream when myocardial cells are damaged. Their levels correlate with the extent of cardiac tissue injury, helping providers assess severity and guide treatment.

C. Pulmonary congestion is assessed via physical examination, chest X-ray, or echocardiography, not cardiac enzyme levels.

D. Structural assessment requires echocardiography or other imaging, not blood enzyme studies.

View Question and Answer

Whether you are a student looking to ace your exams or a practicing nurse seeking to enhance your expertise , our nursing education contents will empower you with the confidence and competence to make a difference in the lives of patients and become a respected leader in the healthcare field.

Visit Naxlex, invest in your future and unlock endless possibilities with our unparalleled nursing education contents today

A 55-year-old patient with a history of hypertension is undergoing a routine ECG as part of their annual check-up. The ECG reveals a first-degree AV block. Which of the following statements about first-degree AV block is correct?

Nursing Test Bank

Naxlex Comprehensive Predictor Exams

A nurse is reviewing the laboratory values of a client who had a myocardial infarction 3 hr ago. The nurse should expect which of the following laboratory values to be elevated?

Correct Answer is D

Explanation

A nurse is teaching the partner of a client who had an acute myocardial infarction (MI) about the reason blood was drawn from the client. Which of the following statements should the nurse make regarding cardiac enzymes studies?

Correct Answer is B

Explanation

A nurse is monitoring an older adult female client who had a myocardial infarction (MI) for the development of an acute kidney injury. Which of the following findings should the nurse identify as indicating an increased risk of acute kidney injury (AKI)?

A nurse is admitting a client who has acute heart failure following myocardial infarction (MI). The nurse recognizes that which of the following prescriptions by the provider requires clarification?

A nurse in an emergency department is caring for a client who reports substernal chest pain and dyspnea. The client is vomiting and is diaphoretic. Which of the following laboratory tests are used to diagnose a myocardial infarction? (Select all that apply)

A 55-year-old patient with a history of hypertension is undergoing a routine ECG as part of their annual check-up. The ECG reveals a first-degree AV block. Which of the following statements about first-degree AV block is correct?

A nurse is caring for a client who reports heart palpitations. An ECG confirms the client is experiencing ventricular tachycardia (VT). The nurse should anticipate the need for taking which of the following actions?

A 22-year-old patient presents with fatigue, chest discomfort, and palpitations. Vital signs show HR 112 bpm. BP 98/5, and low-grade fever. The nurse notes irregular heart sounds and severe pedal edema. Which condition should the nurse suspect? (Select All that Apply.)

A nurse is reviewing laboratory results for a client who has pericarditis. Which of the following blood test results should the nurse anticipate? (Select All that Apply.)

A nurse is monitoring a client who is on telemetry. Which of the following findings on the ECG strip should the nurse recognize as normal sinus rhythm?