Figure 3. Recordings of RAR activity in an intact control rabbit (A) and a rabbit with chronic pulmonary venous congestion for 12 weeks (B) showing their response to acute elevation of left atrial pressure (LAP).

a, initial control period; b, LAP + 5 mmHg; c, LAP + 10 mmHg. Note that in intact control animal A, RAR shows an increase in its activity with acute elevation of LAP whereas in B it does not. TP, tracheal pressure; Action potential, RAR activity recorded in the cervical vagus nerve; Discriminator signal, processed signal from the amplitude discriminator/electronic counter; BP, blood pressure.