Flash pulmonary oedema after inferior MI — case discussion

Objectives

1. Recognise a post-infarction mechanical complication from its clinical clues.^[3]
2. Confirm acute severe MR and its mechanism with immediate echocardiography.^[3][2]
3. Stabilise the circulation as a bridge, not a destination.^[1][2]
4. Choose definitive treatment for papillary muscle rupture, and know where transcatheter repair fits.^[1][3]

Candidate brief

You are the cardiology consultant on call. You have twenty minutes to present assessment, stabilisation, definitive plan and disposition.

Expected actions

• Recognise the pattern. Sudden hypotension, a new murmur suggesting acute MR or a septal defect, and pulmonary congestion should raise suspicion of a mechanical complication.^[3] Acute MR is often missed or delayed because it presents differently from chronic MR.^[4] Its murmur may be short and unimpressive.^[2]
• Image immediately. ESC 2023 ACS says immediate echocardiographic assessment is indicated when a mechanical complication is suspected.^[3] TTE comes first. After infarction with sudden haemodynamic instability, a hyperdynamic LV on TTE and no other cause for the deterioration, TOE can be especially helpful in detecting papillary muscle or chordal rupture.^[2]
• Stabilise. The ESC/EACTS 2025 text notes that inotropes and diuretics are usually indicated to reduce filling pressure and control congestion in acute primary MR.^[1] ESC/EACTS 2025 says nitroprusside has been used as a bridge in patients without signs of hypotension, and ACC/AHA 2020 notes vasodilator use is often limited by systemic hypotension, so a vasodilator is an option only if she has no signs of hypotension; doses per local formulary and specialist guidance.^[1][2] ESC 2023 ACS states that patients with ACS-related mechanical complications should be considered for IABP while awaiting surgery.^[3] A percutaneous circulatory assist device may stabilise her before the procedure.^[2]
• Treat the valve urgently. Untreated acute valvular decompensation progresses to cardiogenic shock.^[6] The ESC/EACTS 2025 text says urgent surgery or transcatheter treatment is indicated for acute severe primary MR; papillary muscle rupture generally needs surgical valve replacement.^[1] ESC 2023 ACS states that surgery is currently regarded as the treatment of choice for ACS mechanical complications.^[3]
• Know the transcatheter role. Percutaneous strategies are occasionally used in selected patients with a prohibitive risk profile or contraindications to surgery.^[3] For acute primary MR in general, such as a flail leaflet, one review describes edge-to-edge repair as an alternative in an emergency at high surgical risk.^[4] ESC/EACTS 2025 cites increasing evidence for M-TEER in acute ventricular secondary MR, particularly after infarction, a different mechanism from rupture.^[1]
• Disposition. ESC 2023 ACS calls a multidisciplinary approach of paramount importance at all stages, from initial stabilisation to the treatment strategy.^[3] For severe acute MR after infarction, medical management alone carries the worst prognosis.^[5]

Marking

Pass:

• names a mechanical complication, including papillary muscle rupture or septal rupture, and orders immediate echocardiography.^[3][1]
• recognises that the murmur of acute severe MR may be short and unimpressive.^[2]
• stabilises with diuretics and inotropes, uses vasodilators only without signs of hypotension (recognising that hypotension often limits them), and considers IABP or circulatory support as a bridge.^[1][2][3]
• if echocardiography shows papillary muscle rupture, refers for urgent surgery, usually surgical valve replacement.^[1]
• recognises that percutaneous strategies are occasionally used in selected patients with a prohibitive risk profile or contraindications to surgery (ESC 2023 ACS).^[3][4]

Fail:

• delays echocardiography for other imaging, such as CT pulmonary angiography, despite a new murmur after infarction.^[3]
• relies on medical therapy alone and defers the surgical decision.^[5][3]
• starts nitroprusside despite signs of hypotension.^[1][2]
• manages her as chronic MR with outpatient GDMT titration.^[1]