In simple words: Atypical atrial flutter is a condition where the upper chambers of your heart (atria) beat too fast, but in an unusual pattern. This can make your heart beat irregularly.

Atypical atrial flutter is a heart rhythm disorder characterized by rapid and regular, but atypical, contractions of the atria. The atria beat faster than the ventricles, and the electrical impulses don't follow the typical pattern seen in typical atrial flutter. The heart has four chambers: two atria and two ventricles. Normally, electrical signals cause the atria and ventricles to contract in a coordinated rhythm. In atypical atrial flutter, the electrical signals in the atria are rapid and irregular, which can lead to an irregular heartbeat.

Example 1: A 55-year-old patient presents with palpitations and shortness of breath. An ECG reveals an atypical atrial flutter pattern. The patient is treated with medication to control the heart rate and rhythm., A 70-year-old patient with a history of hypertension and heart disease develops atypical atrial flutter during a hospital stay for pneumonia. The patient undergoes electrical cardioversion to restore normal sinus rhythm., A 30-year-old patient with no prior history of heart problems experiences an episode of atypical atrial flutter after consuming excessive amounts of caffeine. The patient's symptoms resolve spontaneously, and they are advised to avoid caffeine.

Documentation for I48.4 should include a detailed description of the patient's symptoms, ECG findings demonstrating the atypical atrial flutter pattern, and any associated medical conditions. Details of treatment provided, such as medication or cardioversion, should also be documented.