Examkin

Soru

Zorluk: ZorDiagnostic Workup and Test Sequencing

Match each patient presentation of suspected stable ischemic heart disease with the most appropriate guideline-indicated next step in diagnostic test sequencing.

  • A 48-year-old patient with intermittent atypical chest pain, an interpretable resting electrocardiogram, and unrestricted physical mobility.Exercise electrocardiography (without imaging)
  • A 64-year-old patient evaluating for exertional angina who can exercise vigorously, but has a resting electrocardiogram demonstrating left ventricular hypertrophy with 1.5 mm ST-segment depressions.Exercise stress imaging (echocardiography or myocardial perfusion)
  • A 72-year-old patient with typical angina who cannot use a treadmill due to advanced osteoarthritis, and has poorly controlled asthma with active baseline wheezing.Pharmacologic stress testing with dobutamine echocardiography
  • A 67-year-old patient with typical angina who is physically active and capable of exercise, but has a baseline electrocardiogram showing a left bundle branch block.Pharmacologic stress testing with vasodilator myocardial perfusion imaging

Cevap

The normal baseline ECG capable of exercise pairs with exercise electrocardiography. The ST-depressions capable of exercise pairs with exercise stress imaging. The patient with asthma unable to exercise pairs with dobutamine echocardiography. The patient with a left bundle branch block pairs with vasodilator myocardial perfusion imaging.
Appropriate test sequencing in stable ischemic heart disease requires triaging based on exercise capacity, ECG interpretability, and specific pharmacologic contraindications. The correct pairings align physical capacity with exercise stressors, uninterpretable ECGs with imaging, asthma with dobutamine, and LBBB with vasodilators.

Adım Adım Çözüm

1
Assess the patient's physical ability to achieve a target heart rate.
Determines whether an exercise or pharmacologic stress test is required.
Exercise is always the preferred stressor as it provides physiological prognostic data, but cannot be used if the patient has severe mobility limitations.
2
Evaluate the baseline electrocardiogram for abnormalities.
Identifies left bundle branch block, paced rhythms, pre-excitation, or ST depressions greater than 1 mm.
These baseline abnormalities render standard exercise electrocardiography uninterpretable and mandate the use of concurrent imaging.
3
Identify specific electrocardiogram patterns that contraindicate increased heart rate during imaging.
Identifies that a left bundle branch block requires a vasodilator rather than an exercise or dobutamine stressor.
Tachycardia in a patient with a left bundle branch block causes false-positive reversible septal defects on imaging studies.
4
Review medical history for contraindications to specific pharmacologic agents.
Identifies active reactive airway disease (asthma/wheezing) as a strict contraindication to vasodilator agents.
Vasodilators such as adenosine and dipyridamole can trigger life-threatening bronchospasm; dobutamine must be used instead.

Anahtar Kavram

The selection of the initial noninvasive diagnostic test for suspected stable ischemic heart disease depends on evaluating the patient's ability to exercise, the interpretability of their baseline electrocardiogram, and the presence of comorbidities that contraindicate specific pharmacologic stress agents.
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Diagnostic Workup and Test Sequencing

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