The risk stratification calculator for acute pericarditis evaluates the risk of complications by assessing specific clinical indicators provided by the user. The user selects from a predefined list of options related to symptoms and medical history, and the calculator determines if the individual's risk of complications is high.

The inputs are a set of indicators where each option is an indication of potential complications. Options include:

- Signs of cardiac tamponade
- Large pericardial effusion (diastolic echo-free space > 20 mm)
- History of chest trauma
- Oral anticoagulant therapy
- Associated myocarditis
- Immunosuppression
- Fever (> 38 degrees C)
- Subacute onset of symptoms
- No response to nonsteroidal anti-inflammatory drug therapy

Each input selected by the user corresponds to the above indicators and is evaluated to check whether any of these conditions are met. 

The computation is straightforward:
1. Each input is assessed to determine if it matches any of the specified indicators.
2. If any of the conditions (A to I) are true, the output is "Risk of complications is high."
3. If none of the conditions are true, the output is "Risk of complications is not high."
4. Additionally, if no selection is made, the output will prompt the user with "Please make a selection for all inputs."

The calculator in question is the Risk Stratification for Acute Pericarditis calculator. This tool is used in the clinical setting to assess the risk of complications in patients diagnosed with acute pericarditis. Acute pericarditis is an inflammation of the pericardium, the sac-like covering of the heart. 

The calculator is applicable to patients who have been diagnosed with acute pericarditis. It helps clinicians to stratify the risk of complications such as cardiac tamponade, constrictive pericarditis, or recurrence of pericarditis. This risk stratification can guide treatment decisions and follow-up planning.

The calculator uses several variables including age, cause of pericarditis, presence of myopericarditis, and response to NSAIDs (Non-Steroidal Anti-Inflammatory Drugs) to calculate the risk score. 

Exclusion criteria for the use of this calculator would include patients who do not have a confirmed diagnosis of acute pericarditis, or those with contraindications to the medications used in the treatment of pericarditis.

Risk stratification for acute pericarditis

2015 ESC Guidelines for the diagnosis and management of pericardial diseases: The Task Force for the Diagnosis and Management of Pericardial Diseases of the European Society of Cardiology (ESC) Endorsed by: The European Association for Cardio-Thoracic Surgery (EACTS).