GENERAL INFORMATION

It is an expectation that all patients receive care/services from a licensed clinician. All appropriate supporting documentation, including recent pertinent office visit notes, laboratory data, and results of any special testing must be provided. If applicable: All prior relevant imaging results and the reason that alternative imaging cannot be performed must be included in the documentation submitted. 

Where a specific clinical indication is not directly addressed in this guideline, medical necessity determination will be made based on widely accepted standard of care criteria. These criteria are supported by evidence-based or peer-reviewed sources such as medical literature, societal guidelines and state/national recommendations.

Policy
This guideline is for stress imaging, specifically Heart (Cardiac) PET imaging, with appropriate preference for suitable alternatives, such as stress echocardiography (SE) or myocardial perfusion imaging (MPI), when more suitable, unless otherwise stated (refer to Rationale section).

INDICATIONS FOR HEART PET WITH CT FOR ATTENUATION^1,2,3,4

• SUSPECTED CAD (When neither SE nor MPI have provided or are expected to provide optimal imaging)

Symptomatic patients without known CAD (use Diamond Forrester Table) 

• Low or intermediate pretest probability and unable to exercise (SE diversion not required)
• High pretest probability (SE diversion not required)
• Repeat testing in a patient with new or worsening symptoms and negative result at least one year ago AND meets one of the criteria above

• Asymptomatic patients without known CAD (SE diversion not required)  
  • Previously unevaluated ECG evidence of possible myocardial ischemia including substantial ischemic ST segment or T wave abnormalities (see section in Overview) 
  • Previously unevaluated pathologic Q waves (see section in Overview) 
  • Unevaluated complete left bundle branch block 

ABNORMAL CALCIUM SCORES (CAC)^4,5,6,7,8 (When neither SE nor MPI have provided, or are expected to provide, optimal imaging)

• ASYMPTOMATIC patient with a calcium score > 400, not previously evaluated
• SYMPTOMATIC patient with prior CAC ≥ 100 

INCONCLUSIVE CAD EVALUATION AND OBSTRUCTIVE CAD REMAINS A CONCERN (When neither SE nor MPI have provided, or are expected to provide, optimal imaging)

• Exercise stress ECG with low-risk Duke treadmill score (≥ 5), (see section in Overview) but patient’s current symptoms indicate an intermediate or high pretest probability (SE diversion not required for high pretest probability)
• Exercise stress ECG with an intermediate Duke treadmill score (SE diversion not required for symptoms consistent with high pretest probability) 
• Inconclusive/borderline coronary computed tomography angiography (CCTA) (e.g., 40% – 70% lesions) 
• Non-diagnostic exercise stress test with physical inability to achieve target heart rate (THR) (SE diversion not required)
• An intermediate evaluation by prior stress imaging (SE diversion not required)
• Coronary stenosis of unclear significance on previous coronary angiography⁴

FOLLOW-UP OF PATIENT’S POST CORONARY REVASCULARIZATION (PCI or CABG) (When neither SE nor MPI have provided, or are expected to provide, optimal imaging)⁴

• Asymtomatic, follow-up stress imaging at a minimum of 2 years post coronary artery bypass grafting (CABG), or percutaneous coronary intervention (PCI), (whichever is later), is appropriate only for patients with a history of silent ischemia or a history of a prior left main stent 

OR

• For patients with high occupational risk (e.g., associated with public safety, airline and boat pilots, bus and train drivers, bridge and tunnel workers/toll collectors, police officers, and firefighters) 

New, recurrent, or worsening symptoms post coronary revascularization, is an indication for stress imaging, if it will alter management (SE diversion not required for typical anginal symptoms or symptoms documented to be similar to those prior to revascularization) 

FOLLOW-UP OF KNOWN CAD (When neither SE nor MPI have provided or are expected to provide optimal imaging)

• Follow-up of asymptomatic or stable symptoms when last invasive or non-invasive assessment of coronary disease showed hemodynamically significant CAD (ischemia on stress test or FFR ≤ 0.80 or significant stenosis in a major vessel (≥ 50% left main coronary artery or ≥ 70% LAD, LCX, RCA)) over two years ago, without intervening coronary revascularization is an appropriate indication for stress imaging in patients if it will alter management

SPECIAL DIAGNOSTIC CONDITIONS REQUIRING CORONARY EVALUATION (When neither SE nor MPI have provided, or are expected to provide, optimal imaging)

• Prior acute coronary syndrome (as documented in MD notes), without subsequent invasive or non-invasive coronary evaluation 
• Newly diagnosed systolic heart failure or diastolic heart failure, with reasonable suspicion of cardiac ischemia (prior events, risk factors), unless invasive coronary angiography is immediately planned^2,9,10
• Reduced LVEF ≤ 50% requiring myocardial viability assessment to assist with decisions regarding coronary revascularization. (Diversion from PET not required when LVEF less than or equal to 40%)^9,10,11
• Ventricular arrhythmias 
  • Sustained ventricular tachycardia (VT) > 100 bpm, ventricular fibrillation (VF), or exercise-induced VT, when invasive coronary arteriography is not the immediately planned test¹²
  • Nonsustained VT, multiple episodes, each ≥ 3 beats at ≥ 100 bpm, frequent PVC’s(defined as greater than or equal to 30/hour on remote monitoring) without known cause or associated cardiac pathology, when an exercise ECG cannot be performed 
• Prior to Class IC antiarrhythmic drug initiation (Propafenone or Flecainide), as well as annually in intermediate and high global risk patients (SE diversion not required)¹³
• Assessment of hemodynamic significance of one of the following documented conditions:¹⁴
  • Anomalous coronary arteries¹⁵
  • Muscle bridging of coronary artery ^4,16
• Coronary aneurysms in Kawasaki’s disease¹⁷ or due to atherosclerosis 
• Following radiation therapy to the anterior or left chest, at 5 years post initiation and every 5 years thereafter¹⁸
• To diagnose microvascular dysfunction in patients with persistent stable anginal chest pain with suspected ischemia and nonobstructive coronary artery disease (INOCA), as documented in provider notes (no MPI diversion required).¹⁹
• Cardiac Sarcoidosis^20,21,22 (may be approved as a combination study with MPI for the evaluation and treatment of sarcoidosis)²³
  • Evaluation and therapy monitoring in patients with sarcoidosis, after documentation of suspected cardiac involvement by echo or ECG, when CMR has not been performed
  • Evaluation of suspected cardiac sarcoid, after CMR has shown equivocal or negative findings in the setting of a high clinical suspicion²² 
  • Evaluation of CMR findings showing highly probable cardiac sarcoidosis, when PET could serve to identify inflammation and the consequent potential role  for immunosuppressive therapy²² 
  • Initial and follow-up PET in monitoring therapy for cardiac sarcoid with immunosuppressive therapy, typically about 4 times over 2 years 
• Infective Endocarditis
  • In suspected infective endocarditis with moderate to high probability (i.e., staph bacteremia, fungemia, prosthetic heart valve, or intracardiac device), when TTE and TEE have been inconclusive with respect to diagnosis of infective endocarditis or characterization of paravalvular invasive complications^24,25,26 
• Aortitis 
  • For diagnosis and surveillance of Aortitis, PET/CT or PET/MRI‡ hybrid imaging²⁷

^‡NOTE: If PET/MR study is requested, there is no specific CPT code for this imaging study and a Health Plan review will be required. 

PRIOR TO ELECTIVE NON-CARDIAC SURGERY (When neither SE nor MPI have provided or are expected to provide optimal imaging) 

• An intermediate or high risk surgery with of one or more risk factors (see below), AND documentation of an inability to walk (or < 4 METs) AND there has not been an imaging stress test within 1 year^28,29,30* 
  • Risk factors: history of ischemic heart disease, history of congestive heart failure, history of cerebrovascular disease, preoperative treatment with insulin, and preoperative serum creatinine > 2.0 mg/dL. 
  • Surgical risk:
    • High-risk surgery: Aortic and other major vascular surgery, peripheral vascular surgery, anticipated prolonged surgical procedures associated with large fluid shifts and/or blood loss
    • Intermediate-risk surgery: Carotid endarterectomy, head and neck surgery, intraperitoneal and intrathoracic surgery, orthopedic surgery, prostate surgery
    • Low-risk surgery: Endoscopic procedures, superficial procedure, cataract surgery, breast surgery
• Planning for any organ or stem cell transplantation is an indication for preoperative stress imaging, if there has not been a conclusive stress evaluation, CTA, or heart  catheterization within the past year, at the discretion of the transplant service³¹

POST CARDIAC TRANSPLANT (SE diversion not required)³²

• Annually, for the first five years post cardiac transplantation, in a patient not undergoing invasive coronary arteriography
• After the first five years post cardiac transplantation, patients with documented transplant coronary vasculopathy can be screened annually if invasive coronary arteriography is not planned

Rationale
Cardiac PET scanning, when used in conjunction with CT attenuation, includes evaluation of perfusion, function, viability, inflammation, anatomy, and risk stratification for cardiac-related events such as myocardial infarction and death. Maximum diagnostic accuracy of cardiac PET/CT is achieved when images are interpreted in conjunction with other relevant imaging, clinical information, and laboratory data.

PET Scan

• Indicated when all the criteria for MPI are met AND there is likely to be equivocal imaging results because of BMI, large breasts or implants, mastectomy, chest wall 
• deformity, pleural or pericardial effusion or prior thoracic surgery or results of a prior MPI
• Can identify regions of myocardial viability with hibernating myocardium (viable, with poor flow and contractility) by imaging with fluorine18 (F-18) fluorodeoxyglucose (FDG or 18-FDG) for this purpose
• Useful in the evaluation of inflammation: e.g., evaluation and therapy monitoring in patients with sarcoidosis, after documentation of cardiac involvement by echo or electrocardiography (ECG), in place of, or subsequent to CMR if needed to help with an uncertain diagnosis

Coronary application of PET includes evaluation of stable patients without known CAD, who fall into two categories^2,3,4

• Asymptomatic, for whom global risk of CAD events can be determined from coronary risk factors, using calculators available online (see websites for Global Cardiovascular Risk Calculators section).
• Symptomatic, for whom we estimate the pretest probability that their chest-related symptoms are due to clinically significant (≥ 50%) CAD (below):

The 3 Types of Chest Pain or Discomfort

• Typical angina (definite) is defined as including all 3 characteristics: 
  • Substernal chest pain or discomfort with characteristic quality and duration
  • Provoked by exertion or emotional stress 
  • Relieved by rest and/or nitroglycerine
• Atypical angina (probable) has only 2 of the above characteristics 
• Nonanginal chest pain/discomfort has only 0 – 1 of the above characteristics 

The medical record should provide enough detail to establish the type of chest pain. From those details, The Pretest Probability of obstructive CAD is estimated from the Diamond Forrester Table below, recognizing that in some cases multiple additional coronary risk factors could increase pretest probability:^2,4 

Diamond Forrester Table

• Very Low: < 5% pretest probability, usually not requiring stress evaluation
• Low: 5 – 10% pretest probability of CAD
• Intermediate: 10% – 90% pretest probability of CAD
• High: > 90% pretest probability of CAD

OVERVIEW
ECG Stress Test Alone Versus Stress Testing With Imaging
Prominent scenarios suitable for an ECG stress test WITHOUT imaging (i.e., exercise treadmill ECG test) require that the patient can exercise for at least 3 minutes of Bruce protocol with achievement of near maximal heart rate AND has an interpretable ECG for ischemia during exercise:⁴

• The (symptomatic) low or intermediate pretest probability patient who can exercise and has an interpretable ECG⁴
• The patient who is under evaluation for exercise-induced arrhythmia
• The patient who requires an entrance stress test ECG for a cardiac rehab program or for an exercise prescription
• For the evaluation of syncope or presyncope during exertion³⁵

Duke Exercise ECG Treadmill Score
Calculates risk from ECG treadmill alone:³⁶

• The equation for calculating the Duke treadmill score (DTS) is: DTS = exercise time in minutes - (5 x ST deviation in mm or 0.1 mV increments) - (4 x exercise angina score), with angina score being 0 = none, 1 = non-limiting, and 2 = exercise-limiting.
• The score typically ranges from - 25 to + 15. These values correspond to low-risk (with a score of ≥ + 5), intermediate risk (with scores ranging from - 10 to + 4), and high-risk (with a score of ≤ - 11) categories.

An uninterpretable baseline ECG includes:²

• ST segment depression 1 mm or more (not for non-specific ST- T wave changes)
• Ischemic looking T waves; at least 2.5 mm inversions (excluding V1 and V2)
• LVH with repolarization abnormalities, pre-excitation pattern such as WPW, ventricular paced rhythm, or left bundle branch block
• Digitalis use with associated ST segment abnormalities

Previously unevaluated pathologic Q waves (in two contiguous leads) defined as the following:

• > 40 ms (1 mm) wide
• > 2 mm deep
• > 25% of depth of QRS complex

Global Risk of Cardiovascular Disease
Global risk of CAD is defined as the probability of manifesting cardiovascular disease over the next 10 years and refers to asymptomatic patients without known cardiovascular disease. It should be determined using one of the risk calculators below. A high risk is considered greater than a 20% risk of a cardiovascular event over the ensuing 10 years. High global risk by itself generally lacks scientific support as an indication for stress imaging. There are rare exemptions, such as patients requiring I-C antiarrhythmic drugs who might require coronary risk stratification prior to initiation of the drug.

• CAD Risk — Low 10-year absolute coronary or cardiovascular risk less than 10%
• CAD Risk — Moderate 10-year absolute coronary or cardiovascular risk between 10% and 20%
• CAD Risk — High 10-year absolute coronary or cardiovascular risk of greater than 20%

Websites for Global Cardiovascular Risk Calculators*

*Patients who have already manifested cardiovascular disease are already at high global risk and are not applicable to the calculators.^37,38,39,40

Definitions of Coronary Artery Disease^2,3,6
Percentage stenosis refers to the reduction in diameter stenosis when angiography is the method and can be estimated or measured using angiography or more accurately measured with intravascular ultrasound (IVUS).

• Coronary artery calcification is a marker of risk, as measured by Agatston score on coronary artery calcium imaging. Its incorporation into global risk can be achieved by using the MESA risk calculator.
• Ischemia-producing disease (also called hemodynamically or functionally significant disease, for which revascularization might be appropriate) generally implies at least one of the following:
  • Suggested by percentage diameter stenosis ≥ 70% by angiography; intermediate lesions are 50% – 69%⁴¹
  • For a left main artery, suggested by a percentage stenosis ≥ 50% or minimum lumen cross-sectional area on IVUS ≤ 6 square mm^2,42
  • FFR (fractional flow reserve) ≤ 0.80 for a major vessel⁴²
  • Demonstrable ischemic findings on stress testing (ECG or stress imaging), that are at least mild in degree
• A major vessel would be a coronary vessel that would be amenable to revascularization if indicated. This assessment is made based on the diameter of the vessel and/or the extent of myocardial territory served by the vessel.
• FFR (fractional flow reserve) is the distal to proximal pressure ratio across a coronary lesion during maximal hyperemia induced by either intravenous or intracoronary adenosine. Less than or equal to 0.80 is considered a significant reduction in coronary flow.
• Newer technology that estimates FFR from CCTA image is covered under the separate NIA Guideline for FFR-CT.

Anginal Equivalent^2,35
Development of an anginal equivalent (e.g., shortness of breath, fatigue, or weakness) either with or without prior coronary revascularization should be based upon the documentation of reasons to suspect that symptoms other than chest discomfort are not due to other organ systems (e.g., dyspnea due to lung disease, fatigue due to anemia), by presentation of clinical data, such as respiratory rate, oximetry, lung exam, etc. (as well as d-dimer, chest CT(A), and/or PFTs, when appropriate), and then incorporated into the evaluation of coronary artery disease as would chest discomfort. Most syncope per se is not an anginal equivalent.

Abbreviations

References 

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Coding Section 

Procedure and diagnosis codes on Medical Policy documents are included only as a general reference tool for each policy. They may not be all-inclusive.

This medical policy was developed through consideration of peer-reviewed medical literature generally recognized by the relevant medical community, U.S. FDA approval status, nationally accepted standards of medical practice and accepted standards of medical practice in this community, Blue Cross Blue Shield Association technology assessment program (TEC) and other nonaffiliated technology evaluation centers, reference to federal regulations, other plan medical policies, and accredited national guidelines.

"Current Procedural Terminology © American Medical Association. All Rights Reserved" 

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