Clinical approach to “Central” Chest Pain
Differential diagnosis
- Esophageal pain
- Esophageal spasm
- Esophageal reflux
- Musculoskeletal pain
- Anginal pain
History taking
- Active process.
- Direct questioning to check details and to confirm common understanding of the words.
- Co-existing fundamentally different pain is also possible.
Characteristics of Angina “like” central chest pain
Site
- Constant and characteristic for each patient (different for different patients).
- Location is diffuse.
- Not “inframammary”.
Character
- Gripping/tight.
- Not stabbing/sharp.
Severity
- Unrelated to severity/duration of ischemia.
- Silent ischemia: 50% of times.
Onset
- Not abrupt.
- Pain is either present or absent. It is not a background pain.
Duration and relief
- Ischemia: 3-10 mins. Decreases with relaxation/rest/nitrates (Onset of action: 2-3 mins).
- Infarction: pain > 30 mins. Any pain more than 30 mins without any subsequent evidence of myocardial infarction (Clinical, ECG, cardiac enzymes) - CARDIAC INVOLVEMENT UNLIKELY.
Initiation factor
Stable effort angina:
- Atherosclerotic plaque (leading to fixed coronary artery narrowing)
- At rest and upto certain limit of effort: normal blood supply distally.
- After certain limit: blood supply to distal region impaired, “angina” develops.
- Precipitated by: physical exertion, emotional stress, excessive meals, cold weather.
- Stereotype events: Rest (asymptomatic) –> Exertion (asymptomatic) –> more exertion (angina) –> Rest (asymptomatic)
- Atherosclerotic plaque (leading to fixed coronary artery narrowing)
Unstable angina/acute myocardial infarction:
- Plaque fissure
- Thrombus –> intraluminal extension (Fixed component)
- Chemical mediators –> VAsospasm (Dynamic component)
- Stereotype is lost
- Angina: unexpected occurence, increased frequency and duration.
- Different cases have different proportion of:
- THROMBUS ——— VASOSPASM (100% is called prinzmetal angina)
- Plaque fissure
Symdrome X (Microvascular syndrome):
- Indistinguishable from Stable Effort Angina.
Confirmation of diagnosis
- Stress Angina:
- Stress Testing: proves that chest pain is due to cardiac cause.
- Angiography: diagnosis of cause as coronary block.
- Unstable Angina:
- Stress Testing: Potentially dangerous.
- Continuous ECG monitoring.
- Syndrome X:
- Stress Testing: positive.
- Angiography: negative.
Cardiac vs esophageal pain
- Chest pain > 30 min and ECG normal: Unlikely to be cardiac.
- Chest pain decreasing with antacids: Esophageal.
- Chest pain increased with deglutition of saliva: Esophageal.
- Chest pain associated with dysphagia: Esophageal.
May be indistinguishable
Cardiac vs muscular pain
- Chest pain induced by movement of part: Muscular pain.