# Congestive Heart Failure RR Interval Database

This database includes beat annotation files for 29 long-term ECG recordings of subjects aged 34 to 79, with congestive heart failure (NYHA classes I, II, and III). Subjects included 8 men and 2 women; gender is not known for the remaining 21 subjects. The original ECG recordings (not available) were digitized at 128 samples per second, and the beat annotations were obtained by automated analysis with manual review and correction.

For additional data of this type, including digitized ECG signals, see the BIDMC Congestive Heart Failure Database.

We thank Rochelle Goldsmith, of Columbia-Presbyterian Medical Center, New York, for her generous contribution of these data to PhysioBank.

### References

The following studies have made use of these data:

1. Krum H, Bigger JT Jr, Goldsmith RL, Packer M. Effect of long-term digoxin therapy on autonomic function in patients with chronic heart failure. J Am Coll Cardiol 1995; 25:289-294.
2. Goldsmith RL, Bigger JT, Bloomfield DM, Krum H, Steinman RC, Sackner-Bernstein J, Packer M. Long-term carvedilol therapy increases parasympathetic nervous system activity in chronic congestive heart failure. Am J Cardiol 1997; 80:1101-1104.
3. Mietus JE, Peng C-K, Henry I, Goldsmith RL, Goldberger AL. The pNNx files: re-examining a widely used heart rate variability measure. Heart 2002; 88:378-380.