A cardiac viability test is performed to look for viable heart muscles and plan for bypass surgery or CABG. This test assesses blood circulation into heart muscles and glucose metabolism in this test; therefore, it is performed in two parts. Patients with chronic coronary disease and severe left ventricle dysfunction can significantly improve after bypass surgery, and this test can predict these improvements. In the first part of the test, myocardial blood flow is checked using 99mTc-sestamibi and SPECT (single-photon emission computed tomography) machine, whereas the second part provides details of glucose metabolism and is performed using an 18F-FDG and positron emission tomography (PET) machine.
Test information: Fasting: 4-6 hours
Reporting: Within 2 hours*
- Patient should be fasting for around 4-6 hours before the appointment.
- Drinking plain water is allowed and encouraged.
- There is no need to hold urine.
- Please carry all previous medical records, i.e. doctor's referral, previous medical documents etc.
- Always try to reach 15 min before appointment time as the radiopharmaceutical (tracer) used in nuclear medicine has a short half-life, and any delay may cause decay of the tracer, and you may be rescheduled for another day.
- Please carry identification proof such as an Aadhar card, pan card etc.
- इस जाँच के लिए 4-6 घंटे के उपवास की आवश्यकता होती है।
- सादा पानी पीने की अनुमति है और प्रोत्साहित किया जाता है।
- पेशाब रोकने की कोई जरूरत नहीं है।
- कृपया सभी पिछले मेडिकल रिकॉर्ड यानी डॉक्टर का रेफरल, पिछले मेडिकल दस्तावेज आदि ले जाएं।
- हमेशा अपॉइंटमेंट समय से 15 मिनट पहले पहुंचने का प्रयास करें क्योंकि इसमे उपयोग किए जाने वाले रेडियोफार्मास्युटिकल (ट्रेसर) का हाफ-लाइफ छोटा होता है और किसी भी देरी से ट्रेसर का क्षय होकर समाप्त हो सकता है और आपको अगले उपलब्ध स्लॉट पर पुनर्निर्धारित किया जा सकता है।
- कृपया आधार कार्ड, पैन कार्ड आदि जैसे पहचान प्रमाण साथ रखें।
- This test is performed in two parts. The first is the resting myocardial perfusion study, whereas the second depicts glucose metabolism of the myocardium. Usually, there are two protocols such as one-day and two-day protocols. We generally undertake a one-day protocol until specifically prescribed by the referring doctor to perform a two-day protocol.
- It is a long procedure and may take up to 6 hours on a day starting in the morning as per the appointment schedule or 2 hours on one day and 4 hours on the other day with little variability from patient to patient.
- On arrival, once the registration, payment, medical history, and informed consent are done, the patient is checked for fasting blood sugar and depending upon the value of blood sugar level, glucose load is given.
- Parallelly, the resting myocardial perfusion scan injection is done and scanned after 40-60 minutes.
- The level of blood sugar is checked and proportionally Inj. Insulin is given intravenously within 45-90 minutes post-oral glucose administration.
- Once the blood sugar level reaches the desired level, intravenous Inj. 18F-FDG is given, and scanning is performed in the PET-CT machine after 40-60 minutes.
- Images are verified, and if everything is found fine, the patient is discharged.
* For details, please see service-related policies