Exercise testing, from the 6-minute walk to the GXT

Pre-test ECG shows a globally negative Lead I and upright aVR. What is the most likely cause of this morphology?

1. Incorrect placement of V1 and V2
   Precordial misplacement changes chest leads only; lead I and aVR come from the limb electrodes.
2. Reversal of LA and LL electrodes
   This swap mainly exchanges leads I and II and aVL and aVF; aVR stays negative.
3. Reversal of RA and LA electrodes
   Swapping the arm electrodes inverts lead I and exchanges aVR and aVL, giving a negative lead I and an upright aVR.
4. Patient movement artifact issues
   Motion adds a wandering, noisy baseline; it does not cleanly invert whole complexes.
5. Poor skin preparation technique
   Poor contact causes noise and low amplitude, not a consistent change in polarity.

During a symptom-limited exercise test, a patient exhibits the following data at Stage 3. What is the appropriate course of action?

1. Pause to recheck blood pressure
   The pressure is acceptable; the issue is that the patient has asked to stop.
2. Reduce grade and continue test
   Continuing after the patient asks to stop ignores the request.
3. Encourage one additional minute
   Pushing a patient past their stated limit violates the termination rule.
4. Terminate the test immediately
   The patient's request to stop is an indication to end the test, whether or not a target heart rate has been reached.
5. Continue to 85% predicted HR
   In a symptom-limited test the end point is the patient's symptoms, not a heart rate percentage.

A 50-year-old patient (APMHR = 170 bpm) not taking beta-blockers completes a maximal exercise test. Based on the heart rate response shown below, which condition is indicated?

1. Exaggerated BP response
   The table shows no blood pressure, so a pressure label cannot be the finding.
2. Normal vagal withdrawal
   Normal vagal withdrawal produces a steady, adequate rise; this rise stops well short.
3. Autonomic dysreflexia
   Dysreflexia is a hypertensive reflex in spinal cord injury and is unrelated to a low peak heart rate.
4. Normal heart rate response
   A peak at 65% of predicted in a maximal test is not normal.
5. Chronotropic incompetence
   Peak HR is 110 of 170 bpm (65%), and only 41% of heart rate reserve was used, below the 85% and 80% thresholds.

Using the gas exchange data provided, identify the stage where Ventilatory Threshold 1 (VT1) occurs.

1. Cannot be determined
   Both ventilatory equivalents are given, which is enough to locate VT1.
2. VT1 occurs at Stage 1
   Stage 1 is the baseline from which the later rise is measured.
3. VT1 occurs at Stage 2
   At stage 2 VE/VO2 is still flat at 25.0, so ventilation has not yet outpaced oxygen uptake.
4. VT1 occurs at Stage 4
   At stage 4 VE/VCO2 also rises, which marks the second threshold (respiratory compensation), not VT1.
5. VT1 occurs at Stage 3
   VE/VO2 first rises at stage 3 while VE/VCO2 stays flat, which is the ventilatory-equivalent sign of VT1.

A patient's SpO2 drops to 84% with an erratic waveform and heart rate discrepancy during a treadmill test. The patient is asymptomatic. The appropriate immediate action is to:

1. Reposition the probe or switch to an earlobe sensor
   An erratic waveform and a pulse that disagrees with the ECG point to a bad signal, so the reading is checked before it is acted on.
2. Record the value as valid exercise-induced hypoxemia
   A reading with a poor waveform and pulse mismatch is not reliable enough to record as true.
3. Decrease the treadmill workload to the previous stage
   Changing the workload responds to a number that is probably false.
4. Administer supplemental oxygen at a rate of 2 L/min
   Oxygen needs an order and treats a desaturation that has not been confirmed.
5. Terminate the test immediately due to severe desaturation
   Stopping on an artifact ends a valid test; confirm the reading first.

During an exercise test, a patient appears pale and their systolic blood pressure drops 15 mmHg below resting levels despite increasing workload. The correct action is to:

1. Keep workload until stable
   Continuing the same load prolongs the hemodynamic failure.
2. Increase incline for BP
   Adding load to raise pressure is backwards and dangerous.
3. Pause briefly for fluids
   Exertional hypotension here reflects the heart, not hydration.
4. Reduce speed and monitor
   Easing off keeps the patient exercising through a sign of ventricular dysfunction.
5. Stop the test immediately
   A systolic drop of more than 10 mmHg below baseline despite more work, with pallor, signals poor cardiac output and is a reason to end the test.

A patient undergoing CPET has a measured Maximal Voluntary Ventilation (MVV) of 100 L/min and achieves a Peak Ventilation (VE) of 92 L/min. This breathing reserve finding suggests:

1. Poor patient effort
   Reaching 92% of MVV shows a hard effort, not a weak one.
2. Pulmonary limitation
   Breathing reserve is only 8% (92 of 100 L/min), far below the usual 15–20%, so ventilation is near its ceiling.
3. Cardiac output limitation
   With only 8% of breathing reserve left, ventilation, not cardiac output, is what ran out.
4. Normal ventilatory response
   Healthy people stop with a sizable breathing reserve; nearly reaching MVV is abnormal.
5. Peripheral muscle fatigue
   A breathing reserve of only 8% places the limit in ventilation, not in the muscles.

A patient taking a dihydropyridine calcium channel blocker (e.g., amlodipine) for hypertension performs a maximal exercise test. Compared to an unmedicated state, which hemodynamic response is most expected?

1. Significant sinus bradycardia
   Dihydropyridines do not slow the sinus node; reflex tachycardia is more typical.
2. Attenuated heart rate rise
   Amlodipine leaves heart rate unchanged or slightly higher, so a blunted heart rate rise does not fit this drug.
3. False positive ST depression
   Calcium channel blockers are not a recognized cause of false-positive ST depression.
4. Blunted blood pressure response
   Amlodipine dilates arterioles, so blood pressure is lower at rest and its rise during exercise is attenuated.
5. Ventricular ectopy suppression
   Amlodipine has no meaningful antiarrhythmic effect on ventricular ectopy.

A patient with Heart Failure with Reduced Ejection Fraction (HFrEF) completes a maximal CPET. The results show a VE/VCO2 slope of 39. This finding is most strongly associated with:

1. Excellent clinical prognosis
   A favorable prognosis goes with a slope under about 30.
2. Obstructive lung limitation
   Obstruction shows up as low breathing reserve; the VE/VCO2 slope tracks ventilation-perfusion mismatch.
3. Increased risk of mortality
   In HFrEF a VE/VCO2 slope of 36 or more marks ventilatory inefficiency and a worse prognosis.
4. Improved ventilatory status
   A high slope means more ventilation per unit of CO2, which is less efficient, not better.
5. Normal ventilatory response
   Normal values are roughly 20 to 30; 39 is clearly elevated.

During stage 2 of a Bruce protocol test, an asymptomatic patient's blood pressure rises to 254/118 mmHg. According to ACSM guidelines, the most appropriate action is to:

1. Terminate the assessment
   Systolic pressure above 250 mmHg or diastolic above 115 mmHg is a recognized reason to stop the test.
2. Continue with monitoring
   Lack of symptoms does not cancel the blood pressure end point.
3. Reduce treadmill workload
   Once pressure passes 250/115 mmHg the test ends; lowering the stage keeps it going.
4. Maintain current stage time
   Finishing the stage ignores a pressure that has passed the stopping threshold.
5. Retest BP in two minutes
   Waiting two more minutes at this pressure delays the decision the reading already supports.

During a symptom-limited exercise test, a patient reports mild chest tightness. The ECG monitor reveals 2 mm of ST-segment elevation in leads V2-V4 (without Q waves). What is the correct interpretation and action?

1. Early repolarization; continue monitoring
   Early repolarization is a resting pattern that lessens with exercise; new elevation with chest tightness is not benign.
2. Lead artifact; replace the electrodes
   Artifact rarely produces consistent elevation across three contiguous leads with matching symptoms.
3. Transmural ischemia; terminate immediately
   ST elevation of 1 mm or more in leads without Q waves (other than aVR or V1) signals transmural ischemia and is an absolute reason to stop.
4. Reciprocal change; proceed with caution
   Reciprocal change is ST depression opposite an injury current; this is primary elevation.
5. Subendocardial ischemia; decrease intensity
   Subendocardial ischemia shows as ST depression; elevation here calls for stopping, not easing off.

What is the appropriate stage duration for each level of the standard Bruce Protocol?

1. 4 minutes
   The Bruce protocol does not use 4-minute stages.
2. 3 minutes
   Each stage of the standard Bruce protocol lasts 3 minutes before speed and grade increase.
3. 5 minutes
   No standard Bruce stage lasts 5 minutes.
4. 2 minutes
   Two-minute stages are typical of protocols such as Naughton.

A patient grips the handrails firmly during a treadmill exercise test. How does this behavior affect the estimated VO2 calculated from the speed and grade?

1. The formula overestimates the patient's actual VO2
   Handrail support reduces the work the patient actually does, so the prediction from speed and grade comes out too high.
2. The calculation remains accurate despite handrail use
   The equations assume no support; holding on breaks that assumption.
3. The patient's heart rate exceeds the predicted value
   Heart rate is lower than expected for the stage when the rails carry part of the load.
4. The formula underestimates the patient's actual VO2
   This is the wrong direction; the true cost is below the estimate.
5. The vertical work component increases significantly
   Gripping the rails takes weight off the legs, reducing vertical work.

Based on the heart rate recovery data collected during active recovery (2.0 mph, 0% grade), which interpretation regarding the patient's autonomic function and risk profile is correct?

1. Chronotropic incompetence limiting peak capacity
   This patient reached a peak of 162 bpm, and the data describe recovery, not the rise to peak.
2. Sympathetic overactivity requiring beta-blockade
   Prescribing beta-blockade is a medical decision and does not follow from a recovery curve.
3. Normal parasympathetic response after peak exercise
   Normal recovery is a fall of more than 12 bpm in the first minute; 6 bpm is well short.
4. Blunted vagal reactivation with increased mortality risk
   A drop of only 6 bpm at 1 minute of active recovery (12 bpm or less) and 16 bpm at 2 minutes points to slow vagal reactivation, which carries higher risk.
5. Delayed recovery secondary to deconditioning only
   Low fitness slows recovery somewhat, but a 1-minute fall this small is an independent prognostic marker, not merely deconditioning.

Based on the peak exercise data below, how should the exercise test effort be classified?

1. Maximal effort due to fatigue
   Reported fatigue does not make a test maximal when the objective markers say otherwise.
2. Submaximal exercise effort
   Peak RER under 1.10, RPE 14 and 77% of predicted heart rate all fall short of the usual markers of maximal effort.
3. Ventilatory threshold reached
   Passing a threshold does not classify the overall effort of the test.
4. Maximal physiological effort
   None of the usual criteria (RER of 1.10 or more, RPE 17 or more, plateau in VO2) is met.
5. Limited by cardiac ischemia
   No ECG changes or angina are reported, so nothing points to ischemia.