Clinical Assessment: Epigastric Pain — Rule Out ACS First

Immediate Next Steps

1. Repeat & Extend the ECG

• Look carefully at leads II, III, aVF (inferior MI) and V1–V4 (anterior/posterior)
• Do posterior leads (V7–V9) — posterior STEMI is frequently missed on standard 12-lead
• Do right-sided leads (V3R, V4R) to rule out right ventricular MI
• Repeat ECG at 15–30 minutes if the first was normal — dynamic changes are diagnostic

2. Await Troponin I Result + Plan Serial Troponins

• A single negative troponin does not rule out NSTEMI — it takes 3–6 hours from symptom onset to rise
• Since pain started 3 hours ago, the first troponin may still be in the early window
• Plan serial troponin at 3 hours (or at 6 hours from symptom onset) — two negatives with a non-diagnostic ECG are needed before ACS can be reasonably excluded
• Use high-sensitivity troponin (hs-TnI) 0/1h or 0/2h protocol if available

3. Full Vitals + Monitoring

• Continuous cardiac monitoring (SpO₂, BP, HR, rhythm)
• IV access (already presumably done for injection)
• Pulse oximetry + supplemental O₂ only if SpO₂ < 94%

4. Bedside Assessment

• Pain character: radiation to jaw/left arm/back? Diaphoresis? Nausea?
• Risk factors: DM, HTN, dyslipidemia, smoking, prior CAD?
• Associated symptoms: vomiting, belching (can suggest GI cause but also inferior MI)
• Examine for epigastric tenderness (deep guarding → GI), pallor, diaphoresis (→ ACS)

5. Urgent Bloods (if not already done)

6. Bedside Ultrasound (POCUS) — if available

• Assess for wall motion abnormalities (LV regional dysfunction = strongly suggests ischaemia)
• Assess for pericardial effusion, gallstones, free fluid
• IVC collapsibility for fluid status

7. Antiplatelet Therapy — Hold Until ACS Confirmed/Excluded

• Do not give aspirin/clopidogrel empirically before ACS is confirmed — if the cause is peptic ulcer disease or GI bleed, this causes harm
• Once troponin returns positive OR ECG changes appear → activate your ACS protocol immediately (aspirin 325 mg loading + clopidogrel/ticagrelor, anticoagulation, cardiology referral/PCI pathway)

8. Current Medications Given

• Esomeprazole 40 mg IV — appropriate empiric gastroprotection; also recommended pre-emptively if ACS is confirmed and dual antiplatelet therapy will be started
• Ondansetron (Emistat) 8 mg — appropriate for nausea/vomiting

Red Flag: When to Activate Cardiac Catheterization Lab NOW

• ECG shows new ST changes, new LBBB, or deep T-wave inversions
• Patient develops haemodynamic instability (hypotension, shock)
• Persistent or worsening pain despite initial management
• Diaphoresis, pallor, new arrhythmia

Summary Algorithm

Epigastric pain 3h + Normal ECG + Troponin pending
         ↓
Repeat ECG (posterior + RV leads) + Vitals + Monitor
         ↓
Serial Troponin at 3h from symptom onset
         ↓
Troponin POSITIVE or ECG changes → ACS protocol (antiplatelet, anticoagulation, cardiology)
Troponin NEGATIVE at 6h + 2 normal ECGs → Consider GI workup (PUD, GERD, pancreatitis)

Sudden Chest Pain × 3h | Normal ECG | Troponin I Pending

Phase 1 — Do RIGHT NOW (0–10 min)

✅ Already Done

• ECG obtained → No STEMI. Good.
• Troponin I sent. Good.

❗ Still Must Do Immediately

• Standard 12-lead alone is insufficient — add:
  • Right-sided leads (V3R, V4R) → Right ventricular infarct
  • Posterior leads (V7, V8, V9) → Posterior STEMI (tall R in V1/V2, ST depression V1–V3 is the only clue)
• Repeat ECG every 15–30 min while symptomatic — dynamic changes are diagnostic

• Cardiac monitor + pulse oximetry on immediately
• IV access (large bore)
• Supplemental O₂ only if SpO₂ < 94%

• Widened mediastinum → aortic dissection
• Hampton's hump / Westermark sign → PE
• Pneumothorax line
• Pulmonary oedema → LVF/ACS

Phase 2 — ACS Rule-Out (0.5–12 hours)

Calculate the HEART Score (do this now)

Serial Troponin Timing

• Conventional TnI: measure at presentation → repeat at 3–6 hours from symptom onset
• High-sensitivity TnI (hs-TnI): 0h/1h or 0h/2h protocol
• Since pain started 3h ago, your first troponin may still be within the early window — a single negative does not rule out NSTEMI
• Two negative troponins with a non-diagnostic ECG are needed

Additional Bloods (order now)

• CBC, BMP/electrolytes, creatinine
• D-dimer — if PE probability is intermediate/high (Wells score)
• BNP — if dyspnoea/heart failure features
• Lipase/amylase — if epigastric component
• Coagulation — if intervention anticipated

Phase 3 — Rule-Out Significant CAD (>6–12h)

When to Escalate Before Troponin Returns

• New ST changes or LBBB on repeat ECG
• Haemodynamic instability (hypotension, shock, new arrhythmia)
• Persistent severe pain despite analgesia
• Clinical picture is highly suspicious (diaphoresis, known CAD, multiple risk factors)

Inj. Algin (Morphine) 5 mg — In This Patient?

The Core Problem: ACS Not Yet Ruled Out

⚠️ Morphine in ACS — The Evidence

• Morphine is NOT recommended as routine analgesia in NSTEMI/unstable angina
• Multiple studies (including the CRUSADE registry and the CHAMPION trials) have shown that morphine in NSTEMI is associated with worse outcomes — higher mortality, more reinfarction, longer hospital stays
• The mechanism: morphine delays and reduces the absorption/effect of oral antiplatelet agents (aspirin, clopidogrel, ticagrelor) by slowing gastric motility → less platelet inhibition at a critical time
• The ESC 2020 NSTEMI guidelines downgraded morphine: it is acceptable only for refractory pain not controlled by nitrates, with awareness of this interaction
• STEMI guidelines still permit morphine for pain relief, but with the same caution about antiplatelet delay

What Should You Use First for Pain?

Additional Considerations Before Giving Morphine

Bottom Line

Do not give morphine as the first analgesic for chest pain in this patient.

Try sublingual/IV GTN first. If pain is refractory after adequate nitrate therapy, then morphine 2–4 mg IV (titrated slowly) is acceptable — but keep the dose minimal and monitor closely.

If ACS is later confirmed and dual antiplatelet therapy is started, be aware that morphine will blunt ticagrelor/clopidogrel absorption — consider crushed oral agents or IV options.

Inj. Visceralgin (Hyoscine Butylbromide / Buscopan) 5 mg — In This Patient?

What Is Visceralgin?

Why It Is Dangerous in This Patient

1. ⚠️ Anticholinergic → Tachycardia

• Tachycardia increases myocardial oxygen demand
• Tachycardia reduces diastolic filling time → less coronary perfusion
• This can worsen ischaemia and precipitate infarct extension

2. ⚠️ Masks the Clinical Picture

• Partially relieve the pain (smooth muscle relaxation effect) → false reassurance
• Lead you to label the patient as "GI cause" and delay ACS workup
• This is a known diagnostic pitfall, particularly in inferior MI, diabetics, and women

3. ⚠️ Does Not Treat Ischaemic Pain

4. No Benefit if the Cause IS Cardiac

What Is Safe to Give for Pain Right Now?

Once ACS Is Excluded

Inj. Tiemonium Methylsulphate — Can It Be Given Now?

What Is Tiemonium Methylsulphate?

• Blocking muscarinic receptors on smooth muscle of the GI, biliary, and urinary tracts
• Reducing visceral spasm and pain
• As a quaternary compound, it has poor CNS penetration (so less sedation than tertiary anticholinergics like atropine) — but cardiac muscarinic blockade still occurs

The Problem in This Patient

The Hierarchy of Concern

When Can You Give It?