Loud continuous murmur with slight sinus arrhythmia
Patent ductus arteriousus
The murmur can be heard and seen (on the phonocardiogram) throughout all of systole and all of diastole, even though the intensity decreases in diastole, thus it is continuous. This is typical of a PDA.
This example emphasizes the importance of ausculting the heart thoroughly over both the apex and the base on both sides. Only a soft systolic murmur is heard over the left apex, likely due to mitral regurgitation, while the continuous murmur is not appreciated. The continuous PDA murmur is, however, very prominent over the left base. If only the apex were ausculted, the PDA could be missed.