Clinical Analysis: Breathlessness for 2 Days - Patient Dies from Heart Attack While Fasting for Ultrasound

What Most Likely Happened

The Pathophysiology

1. Ischemic myocardium loses contractility (stunning/hibernation)
2. Left ventricular dysfunction -> elevated LV end-diastolic pressure
3. Raised pulmonary capillary wedge pressure -> pulmonary congestion
4. Result: dyspnea from acute pulmonary edema / heart failure caused by the underlying MI

Why Dyspnea as the Sole Presentation of ACS is Dangerous

"Some patients experience 'angina equivalent' symptoms such as dyspnea or fatigue. Symptoms of myocardial ischemia may be atypical in certain populations; particularly women, diabetics, and postoperative patients."

"The pain of acute myocardial infarction is frequently associated with profuse sweating, nausea, dyspnea, and profound weakness. Acute myocardial infarction may also be silent, especially in patients with diabetes mellitus."

The Critical Error: Differential Diagnosis of Acute Dyspnea Was Missed

What Should Have Been Done (Standard of Care)

1. 12-lead ECG immediately - to detect ST elevation (STEMI), new LBBB, ischemic changes
2. Cardiac biomarkers - troponin I or T (would be elevated after 2 days of infarction)
3. Chest X-ray - pulmonary edema pattern
4. SpO2 monitoring and IV access
5. BNP/NT-proBNP - elevated in cardiac failure

Why the Patient Died During Fasting

• Ventricular fibrillation - the most common cause of sudden death in MI (especially in the first few hours of symptom onset, but also in evolving large MI)
• Cardiogenic shock - from large territory infarction with pump failure
• Complete heart block - particularly with inferior MI (RCA territory)
• Mechanical complication - free wall rupture (more common at 3-5 days but can occur earlier in large MI)

• Dehydration - reduces preload, worsens hemodynamics in a failing heart
• Electrolyte shifts (hypokalemia, hypomagnesemia) - lowers the threshold for fatal arrhythmias
• No IV access for emergency resuscitation drugs
• No cardiac monitoring - the patient was not on a monitor when the arrest occurred

Medicolegal Perspective

1. No ECG in a patient with 2 days of dyspnea (failure to follow standard of care)
2. No cardiac monitoring while awaiting the ultrasound
3. Failure to recognize dyspnea as an angina equivalent in a high-risk patient
4. Inappropriate workup (abdominal US instead of cardiac evaluation) without ruling out life-threatening causes first
5. Fasting order without stabilizing a potentially critically ill patient

Key Teaching Points

• Dyspnea is an angina equivalent - always do an ECG in any patient with new-onset breathlessness
• 2 days of dyspnea is a red flag - this is NOT an acute presentation; it is a chronic ischemic process reaching a tipping point
• Troponin would have been elevated for 2 days - highly sensitive troponin rises within 2-3 hours of MI onset and peaks at 12-24 hours
• Never make a patient with unexplained breathlessness fast without cardiac clearance
• High-risk groups (elderly, diabetics, women) often present with dyspnea, fatigue, or epigastric pain instead of classic chest pain - the index of suspicion must be higher

Updated Analysis: Heart Attack + Multi-Organ Failure (MOF)

The Revised Clinical Picture

Scenario A: Cardiogenic Shock Causing MOF (Most Likely)

The Cascade of Cardiogenic Shock → MOF

Large MI (2 days evolving)
        ↓
Massive LV dysfunction
        ↓
↓ Cardiac Output  +  ↑ LV filling pressure
        ↓                        ↓
Systemic hypoperfusion      Pulmonary edema (breathlessness)
        ↓
Organs receive inadequate blood flow
        ↓
┌─────────────────────────────────────────┐
│  KIDNEYS: ischemic AKI (acute tubular   │
│  necrosis) → oliguria → renal failure   │
│                                         │
│  LIVER: ischemic hepatitis ("shock      │
│  liver") → elevated AST/ALT/bilirubin   │
│                                         │
│  BRAIN: confusion, encephalopathy       │
│                                         │
│  GUT: ischemic colitis, ileus           │
│                                         │
│  LUNGS: non-cardiogenic pulmonary edema │
│  (ARDS) from systemic inflammation      │
└─────────────────────────────────────────┘
        ↓
Multiple Organ Dysfunction Syndrome (MODS)
        ↓
Death

"Cardiac failure plus hypotension, with clinical evidence of impaired forward flow including dyspnea, tachycardia, pulmonary edema, peripheral edema, and/or cyanosis."

"AKI has been supplanted by a heterogeneous mix of pathologic conditions including multiple organ failure, renal ischemia, nephrotoxic injury, congenital heart disease, and sepsis... Patients with AKI have a nearly 15-fold increased mortality risk."

"Heart failure, liver disease with ascites, and sepsis enhance nephrotoxicity and hasten renal failure."

Why the Kidneys Failed First (Prerenal AKI)

• Normal renal blood flow = 20% of cardiac output
• In cardiogenic shock, renal perfusion drops precipitously
• Result: prerenal AKI → progresses to ischemic acute tubular necrosis (ATN) within hours
• The fasting state worsened this by causing dehydration - further reducing already critically low renal perfusion pressure

Scenario B: Sepsis with MOF (Must Rule Out)

• Cardiac dysfunction (sepsis-induced cardiomyopathy - a transient but severe LV depression)
• AKI from septic microvascular injury
• Liver failure from septic hepatopathy

"Sepsis = Suspected/confirmed infection with new SOFA score ≥ 2. Septic shock = Sepsis + hypotension requiring vasopressors + lactate > 2 mmol/L."

Scenario C: Massive Pulmonary Embolism

• Right heart strain → reduced LV filling → systemic hypoperfusion → MOF
• More abrupt than ACS, but "2 days" of breathlessness fits a submassive PE progressing to massive

The Role of Fasting in Worsening MOF

What Tests Would Have Revealed This

Summary: What Killed This Patient

1. Large MI evolving silently for 2 days - presenting only as dyspnea (angina equivalent)
2. Progressive cardiogenic shock - low cardiac output causing ischemia to all organs
3. Acute kidney injury from renal hypoperfusion - the kidney mirrors the cardiac status
4. Multi-organ dysfunction - liver, gut, brain also failing from global hypoperfusion
5. Fasting - compounded hypovolemia, dehydration, electrolyte depletion and denied IV access
6. No cardiac workup - no ECG, no troponin, no monitoring - the diagnosis was entirely missed
7. Fatal arrhythmia or pump failure - the terminal event within 2 hours of presentation