Chapter 4 104 TPUS and evacuation of gel during TPUS (n=24) Half of patients who underwent TPUS with echo lucent gel evacuated the gel (Table 4). Nineteen patients were classified as ‘indifferent’ regarding the straining movement. Table 4. Transperineal ultrasound (TPUS) versus evacuation of gel during TPUS Evacuation of gel during TPUS Yes No Total TPUS Relaxation 3 0 3 Indifferent 9 10 19 Paradoxical 0 2 2 Total 12 12 24 TPUS and BET (n=23) Eighteen patients were classified ‘indifferent’ on the transperineal ultrasound (Table 5). Almost half of them expelled the balloon within one minute and the other half in more than one minute or not at all. One patient showed normal ‘relaxation’ of the puborectalis muscle when straining on TPUS, whereas he was not able to expel the balloon within one minute. Table 5. Transperineal ultrasound (TPUS) versus balloon expulsion test (BET) BET < 1 minute > 1 minute Total TPUS Relaxation 1 3 4 Indifferent 10 8 18 Paradoxical 0 1 1 Total 11 12 23 S-EMG versus BET (n=37) Thirteen patients (35%) were classified as ‘paradoxical’ of whom almost half was able to expel the balloon within one minute and half could not (Table 6). Fourteen patients were classified as ‘indifferent’ of whom nine was not able to expel the balloon within one minute.
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