Assessment: The long-standing, brief episodes and lack of an exertional trigger are less typical of angina, which more often occurs with exertion and improves with rest or GTN; however, the available details do not establish a definite cause NICE CKS. A normal ECG does not by itself rule out a cardiac cause, and the normal event-monitor result should be recorded as part of the previous investigations rather than treated as a complete assessment of chest pain NICE CKS.
Clarify when the last episode occurred and ask about radiation, triggers or relief, breathlessness, nausea, sweating, palpitations, dizziness or fainting, cough, haemoptysis, fever, rash, swallowing difficulty and reflux NICE CKS. Review personal cardiovascular risks—including smoking, blood pressure, diabetes and cholesterol—as well as cardiovascular history, other medical conditions, trauma, anxiety or depression, and prescribed, over-the-counter and illicit drug use such as cocaine or methamphetamine NICE CKS. Examine him and use the clinical history and examination to guide whether further investigations are needed; seek specialist advice if the cause cannot be confidently established NICE CKS.
Consider cardiac and non-cardiac causes, including musculoskeletal, respiratory and gastrointestinal conditions, and non-specific chest pain; brief left-sided pain can occur with precordial catch, although the described lack of a postural association does not match the characteristic association noted in the guideline NICE CKS. Do not assign a non-specific or anxiety-related diagnosis until clinical assessment and any indicated investigations have ruled out other causes NICE CKS.
Management and safety: If he remains pain-free and clinically stable, and assessment does not suggest a serious cause or acute coronary syndrome (ACS), manage according to the suspected cause rather than arranging emergency admission solely because of this history NICE CKS. If a musculoskeletal cause is identified, consider analgesia and, where appropriate, physiotherapy or referral to a musculoskeletal team; if assessment and investigations rule out other causes, reassure him and agree a plan that may address stress or anxiety where relevant NICE CKS.
Arrange emergency hospital assessment if serious features are present, including marked tachycardia or respiratory distress, low blood pressure, low oxygen saturation or central cyanosis, altered consciousness, or suspected ACS with current chest pain or complications NICE CKS. Establish the timing of the last episode: for suspected ACS, pain-free patients with chest pain in the last 12 hours and an abnormal ECG or no ECG available require emergency admission, while those with a normal ECG and no complications require urgent same-day assessment NICE CKS.