Dr Kola Tytler MBBS CertHE MBA MSt MRCGPClinical Lead • iatroX
The concern is associated right ventricular (RV) infarction, rather than inferior MI itself: nitrates reduce preload and can precipitate profound hypotension when RV function is impaired, consistent with UK contraindications in acute MI with low filling pressure NICE CKS Guha et al. 2017.
- Inferior MI can involve the RV: RV infarction and dysfunction occur in approximately 40% of inferior STEMIs, making this an important concern Guha et al. 2017.
- Mechanism: nitrate-induced venodilation reduces venous return and RV preload; in a preload-dependent, infarcted RV, this can reduce forward flow, subsequent LV filling and cardiac output, causing severe hypotension Guha et al. 2017.
- Clinical implication: avoid GTN in acute MI with low filling pressure, hypovolaemia, shock or systolic BP below 90 mmHg, and avoid preload-reducing drugs when RV infarction is present SmPC Glyceryl Guha et al. 2017.
Inferior MI alone is not a blanket contraindication: assess blood pressure and possible RV involvement before considering nitrates; hypotension with raised JVP and clear lungs, supported by ST elevation in right-sided ECG leads, suggests RV infarction SmPC Glyceryl Guha et al. 2017.
Key References
- NICE CKS: Angina
- SmPC: Isosorbide Dinitrate Tablets 10 mg
- SmPC: Isosorbide Dinitrate Tablets 20 mg
- SmPC: Glyceryl Trinitrate 400 micrograms/metered dose, sublingual spray
- SmPC: Glyceryl trinitrate Macure
- (Wilkinson-Stokes et al., 2023): Adverse events from nitrate administration during right ventricular myocardial infarction: a systematic review and meta-analysis.
- (Safi et al., 2019): Beta-blockers for suspected or diagnosed acute myocardial infarction.
- (Abramik et al., 2025): Coronary Microvascular Dysfunction and Vasospastic Angina-Pathophysiology, Diagnosis and Management Strategies.
- (Guha et al., 2017): Cardiological Society of India: Position statement for the management of ST elevation myocardial infarction in India.