APEX EKG Test - 41 Questions with Detailed Solutions & Diagrams |
Complete Rhythm Interpretation Board Review
Master complex cardiac electrophysiology and pass your assessment with this premium
APEX EKG test preparation bank featuring 41 high-yield practice questions. This
comprehensive study guide includes 100% verified solutions and detailed diagnostic
diagrams covering EKG grid calculations, interval measurements, and critical cardiac
arrhythmia identification. It is the ultimate tool for telemetry nurses, nursing students,
and cardiology professionals looking to build clinical confidence and secure an A+
grade.
1. A 72-year-old patient with Parkinson's disease has been on levodopa-carbidopa
for several years and now experiences unpredictable "on-off" fluctuations. Which
medication would be most appropriate to add to manage this complication?
A) Benztropine
B) Amantadine
C) Selegiline
D) Pramipexole
Correct Answer: B) Amantadine
Rationale: Amantadine has NMDA receptor antagonism that specifically reduces
levodopa-induced dyskinesias and helps manage motor fluctuations in advanced
Parkinson's disease without worsening parkinsonian symptoms.
2. A 55-year-old female with rheumatoid arthritis develops progressive shortness
of breath and a non-productive cough three months after starting a new
medication. Which disease-modifying antirheumatic drug is most likely
responsible for this pulmonary toxicity?
A) Methotrexate
B) Sulfasalazine
C) Hydroxychloroquine
D) Leflunomide
Correct Answer: A) Methotrexate
Rationale: Methotrexate can cause pneumonitis and pulmonary fibrosis as a serious
adverse effect, presenting with progressive dyspnea and non-productive cough that
requires immediate discontinuation.
,3. A patient with chronic stable angina is prescribed ranolazine as adjunctive
therapy. Which cardiac ion channel does this medication primarily affect to
produce its anti-anginal effect?
A) Sodium channels
B) Calcium channels
C) Potassium channels
D) Late sodium channels
Correct Answer: D) Late sodium channels
Rationale: Ranolazine inhibits the late sodium current, reducing intracellular sodium and
calcium overload during ischemia, which improves myocardial relaxation and reduces
angina without significant hemodynamic effects.
4. A 65-year-old male with benign prostatic hyperplasia and hypertension is
started on tamsulosin. Which adverse effect is most specific to this agent
compared to other alpha-blockers?
A) Orthostatic hypotension
B) Abnormal ejaculation
C) Headache
D) Nasal congestion
Correct Answer: B) Abnormal ejaculation
Rationale: Tamsulosin's selective alpha-1A/1D receptor blockade in the prostate and
bladder neck causes retrograde ejaculation or anejaculation, which is more common with
tamsulosin than other alpha-blockers.
5. A 45-year-old woman with type 2 diabetes and established cardiovascular
disease is started on a GLP-1 receptor agonist. Which of the following agents in
this class has demonstrated cardiovascular mortality benefit in clinical trials?
A) Exenatide
B) Liraglutide
C) Dulaglutide
D) Semaglutide
Correct Answer: B) Liraglutide
Rationale: The LEADER trial demonstrated that liraglutide significantly reduced
cardiovascular mortality, non-fatal MI, and non-fatal stroke in patients with type 2
diabetes and high cardiovascular risk.
,6. A patient with refractory seizures is started on vigabatrin. Which irreversible
adverse effect requires mandatory visual field monitoring every three months?
A) Optic neuritis
B) Peripheral visual field constriction
C) Retinal detachment
D) Glaucoma
Correct Answer: B) Peripheral visual field constriction
Rationale: Vigabatrin causes irreversible peripheral visual field defects in approximately
30-50% of patients, requiring regular automated perimetry and visual field testing during
treatment.
7. A 28-year-old woman with multiple sclerosis experiences a sudden exacerbation
with optic neuritis. Which high-dose corticosteroid regimen is considered first-line
for acute MS relapse?
A) Oral prednisone 60 mg daily tapered over 3 weeks
B) Intravenous methylprednisolone 1 gram daily for 3-5 days
C) Intravenous dexamethasone 4 mg every 6 hours
D) Oral methylprednisolone 500 mg daily for 5 days
Correct Answer: B) Intravenous methylprednisolone 1 gram daily for 3-5 days
Rationale: High-dose intravenous methylprednisolone (1g daily for 3-5 days) is the
standard of care for acute MS relapses, accelerating recovery of neurologic function
without a required oral taper.
8. Which antifungal agent requires therapeutic drug monitoring due to its narrow
therapeutic window and significant variability in absorption and metabolism?
A) Fluconazole
B) Voriconazole
C) Caspofungin
D) Amphotericin B
Correct Answer: B) Voriconazole
Rationale: Voriconazole has highly variable pharmacokinetics with CYP2C19
polymorphism affecting metabolism; therapeutic drug monitoring (trough levels 1-5.5
mcg/mL) is recommended to optimize efficacy and minimize toxicity.
, 9. A 60-year-old patient with diabetic nephropathy and macroalbuminuria is
started on an ACE inhibitor. What is the maximum recommended dose of losartan
for maximal renoprotection in this patient population?
A) 25 mg daily
B) 50 mg daily
C) 100 mg daily
D) 150 mg daily
Correct Answer: C) 100 mg daily
Rationale: The RENAAL and IDNT trials established that losartan 100 mg daily (or
equivalent doses of other ARBs) provides maximal renoprotection by reducing
intraglomerular pressure and proteinuria in diabetic nephropathy.
10. A patient receiving isoniazid for tuberculosis treatment develops peripheral
neuropathy. Which vitamin deficiency is most likely responsible for this adverse
effect?
A) Vitamin B1 (Thiamine)
B) Vitamin B6 (Pyridoxine)
C) Vitamin B12 (Cobalamin)
D) Vitamin B9 (Folate)
Correct Answer: B) Vitamin B6 (Pyridoxine)
Rationale: Isoniazid causes pyridoxine (vitamin B6) deficiency by competing with pyridoxal
phosphate, leading to peripheral neuropathy; supplementation with 25-50 mg pyridoxine
daily is recommended for high-risk patients.
11. A 50-year-old male with chronic hepatitis C and compensated cirrhosis is
treated with glecaprevir-pibrentasvir. What is the unique advantage of this
combination over other direct-acting antivirals?
A) No dose adjustment required in mild renal impairment
B) Effective in all genotypes with high barrier to resistance
C) Shorter treatment duration of 8 weeks for treatment-naïve patients
D) All of the above
Correct Answer: D) All of the above
Rationale: Glecaprevir-pibrentasvir is pangenotypic, requires no dose adjustment in renal
impairment, and offers 8-week therapy for treatment-naïve patients without cirrhosis, with
>95% SVR rates.
Complete Rhythm Interpretation Board Review
Master complex cardiac electrophysiology and pass your assessment with this premium
APEX EKG test preparation bank featuring 41 high-yield practice questions. This
comprehensive study guide includes 100% verified solutions and detailed diagnostic
diagrams covering EKG grid calculations, interval measurements, and critical cardiac
arrhythmia identification. It is the ultimate tool for telemetry nurses, nursing students,
and cardiology professionals looking to build clinical confidence and secure an A+
grade.
1. A 72-year-old patient with Parkinson's disease has been on levodopa-carbidopa
for several years and now experiences unpredictable "on-off" fluctuations. Which
medication would be most appropriate to add to manage this complication?
A) Benztropine
B) Amantadine
C) Selegiline
D) Pramipexole
Correct Answer: B) Amantadine
Rationale: Amantadine has NMDA receptor antagonism that specifically reduces
levodopa-induced dyskinesias and helps manage motor fluctuations in advanced
Parkinson's disease without worsening parkinsonian symptoms.
2. A 55-year-old female with rheumatoid arthritis develops progressive shortness
of breath and a non-productive cough three months after starting a new
medication. Which disease-modifying antirheumatic drug is most likely
responsible for this pulmonary toxicity?
A) Methotrexate
B) Sulfasalazine
C) Hydroxychloroquine
D) Leflunomide
Correct Answer: A) Methotrexate
Rationale: Methotrexate can cause pneumonitis and pulmonary fibrosis as a serious
adverse effect, presenting with progressive dyspnea and non-productive cough that
requires immediate discontinuation.
,3. A patient with chronic stable angina is prescribed ranolazine as adjunctive
therapy. Which cardiac ion channel does this medication primarily affect to
produce its anti-anginal effect?
A) Sodium channels
B) Calcium channels
C) Potassium channels
D) Late sodium channels
Correct Answer: D) Late sodium channels
Rationale: Ranolazine inhibits the late sodium current, reducing intracellular sodium and
calcium overload during ischemia, which improves myocardial relaxation and reduces
angina without significant hemodynamic effects.
4. A 65-year-old male with benign prostatic hyperplasia and hypertension is
started on tamsulosin. Which adverse effect is most specific to this agent
compared to other alpha-blockers?
A) Orthostatic hypotension
B) Abnormal ejaculation
C) Headache
D) Nasal congestion
Correct Answer: B) Abnormal ejaculation
Rationale: Tamsulosin's selective alpha-1A/1D receptor blockade in the prostate and
bladder neck causes retrograde ejaculation or anejaculation, which is more common with
tamsulosin than other alpha-blockers.
5. A 45-year-old woman with type 2 diabetes and established cardiovascular
disease is started on a GLP-1 receptor agonist. Which of the following agents in
this class has demonstrated cardiovascular mortality benefit in clinical trials?
A) Exenatide
B) Liraglutide
C) Dulaglutide
D) Semaglutide
Correct Answer: B) Liraglutide
Rationale: The LEADER trial demonstrated that liraglutide significantly reduced
cardiovascular mortality, non-fatal MI, and non-fatal stroke in patients with type 2
diabetes and high cardiovascular risk.
,6. A patient with refractory seizures is started on vigabatrin. Which irreversible
adverse effect requires mandatory visual field monitoring every three months?
A) Optic neuritis
B) Peripheral visual field constriction
C) Retinal detachment
D) Glaucoma
Correct Answer: B) Peripheral visual field constriction
Rationale: Vigabatrin causes irreversible peripheral visual field defects in approximately
30-50% of patients, requiring regular automated perimetry and visual field testing during
treatment.
7. A 28-year-old woman with multiple sclerosis experiences a sudden exacerbation
with optic neuritis. Which high-dose corticosteroid regimen is considered first-line
for acute MS relapse?
A) Oral prednisone 60 mg daily tapered over 3 weeks
B) Intravenous methylprednisolone 1 gram daily for 3-5 days
C) Intravenous dexamethasone 4 mg every 6 hours
D) Oral methylprednisolone 500 mg daily for 5 days
Correct Answer: B) Intravenous methylprednisolone 1 gram daily for 3-5 days
Rationale: High-dose intravenous methylprednisolone (1g daily for 3-5 days) is the
standard of care for acute MS relapses, accelerating recovery of neurologic function
without a required oral taper.
8. Which antifungal agent requires therapeutic drug monitoring due to its narrow
therapeutic window and significant variability in absorption and metabolism?
A) Fluconazole
B) Voriconazole
C) Caspofungin
D) Amphotericin B
Correct Answer: B) Voriconazole
Rationale: Voriconazole has highly variable pharmacokinetics with CYP2C19
polymorphism affecting metabolism; therapeutic drug monitoring (trough levels 1-5.5
mcg/mL) is recommended to optimize efficacy and minimize toxicity.
, 9. A 60-year-old patient with diabetic nephropathy and macroalbuminuria is
started on an ACE inhibitor. What is the maximum recommended dose of losartan
for maximal renoprotection in this patient population?
A) 25 mg daily
B) 50 mg daily
C) 100 mg daily
D) 150 mg daily
Correct Answer: C) 100 mg daily
Rationale: The RENAAL and IDNT trials established that losartan 100 mg daily (or
equivalent doses of other ARBs) provides maximal renoprotection by reducing
intraglomerular pressure and proteinuria in diabetic nephropathy.
10. A patient receiving isoniazid for tuberculosis treatment develops peripheral
neuropathy. Which vitamin deficiency is most likely responsible for this adverse
effect?
A) Vitamin B1 (Thiamine)
B) Vitamin B6 (Pyridoxine)
C) Vitamin B12 (Cobalamin)
D) Vitamin B9 (Folate)
Correct Answer: B) Vitamin B6 (Pyridoxine)
Rationale: Isoniazid causes pyridoxine (vitamin B6) deficiency by competing with pyridoxal
phosphate, leading to peripheral neuropathy; supplementation with 25-50 mg pyridoxine
daily is recommended for high-risk patients.
11. A 50-year-old male with chronic hepatitis C and compensated cirrhosis is
treated with glecaprevir-pibrentasvir. What is the unique advantage of this
combination over other direct-acting antivirals?
A) No dose adjustment required in mild renal impairment
B) Effective in all genotypes with high barrier to resistance
C) Shorter treatment duration of 8 weeks for treatment-naïve patients
D) All of the above
Correct Answer: D) All of the above
Rationale: Glecaprevir-pibrentasvir is pangenotypic, requires no dose adjustment in renal
impairment, and offers 8-week therapy for treatment-naïve patients without cirrhosis, with
>95% SVR rates.
