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Educational draft · awaiting clinical reviewUse Rapid for revision, not patient-care decisions. Check current national and local guidance and the BNF or BNFC before acting.
RapidcardiologyCMRSPECTPETperfusionviabilitytissue-characterisation

Cardiac MRI and nuclear imaging

Essential points for quick revision.

Synopsis

Select CMR, SPECT or PET for ventricular function, tissue characterisation, perfusion, viability and infiltrative disease while managing contrast, device and radiation constraints.

  • CMR provides accurate biventricular volumes, function and tissue characterisation without ionising radiation.
  • Late gadolinium enhancement pattern helps distinguish ischaemic scar from many non-ischaemic cardiomyopathies but is not a diagnosis in isolation.
  • Stress CMR, SPECT and PET can demonstrate inducible perfusion abnormality; PET can quantify myocardial blood flow in specialist practice.

Key red flags

Extensive ischaemia or severe dysfunction

Large inducible burden, marked biventricular dysfunction or a mechanical complication requires prompt specialist action.

Investigation priorities

01
Cine CMRFirst step

Quantify chamber volumes, mass and biventricular ejection fraction.

Management branches

Preferred routeSuspected cardiomyopathy or myocarditis

Unexplained ventricular dysfunction, arrhythmia or myocardial injury

  1. Obtain ECG, biomarkers and comprehensive echocardiography and address acute instability.
  2. Use CMR when tissue characterisation or accurate biventricular assessment will change diagnosis or management.
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Sources and review status5 sources · checked 27 Aug 2026 · clinical review pending
Sources

Sources and review status

National guidance is shown before implementation-dependent detail. Typical adult dose examples remain subject to patient factors, contraindications and the live BNF or specialist protocol. Source check completed 27 Aug 2026; clinical approval remains outstanding.

Authoring stateRapid draftClinical stateAwaiting reviewJurisdictionUnited Kingdom