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Persistent autonomic dysfunction and bladder sensitivity in primary dysmenorrhea.

Folabomi A Oladosu1,2, Kevin M Hellman3,4, Paula J Ham1

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Summary
This summary is machine-generated.

Menstrual pain (dysmenorrhea) is linked to bladder pain syndrome (BPS) due to abnormal autonomic regulation. This study found dysmenorrheic women show increased bladder sensitivity and altered heart rate variability, suggesting early intervention is crucial.

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Area of Science:

  • Urology
  • Gynecology
  • Pain Medicine

Background:

  • Menstrual pain (dysmenorrhea) is a significant risk factor for bladder pain syndrome (BPS).
  • Abnormal autonomic regulation is implicated in BPS and chronic pain but is understudied in dysmenorrhea.
  • Understanding these mechanisms is vital for developing prophylactic strategies against BPS in women with dysmenorrhea.

Purpose of the Study:

  • To investigate autonomic regulation, specifically heart rate variability (HRV), in women with dysmenorrhea and BPS.
  • To compare autonomic function and bladder sensitivity between healthy controls, dysmenorrheic individuals, and BPS patients.
  • To explore the relationship between menstrual pain, autonomic dysfunction, and bladder sensitivity.

Main Methods:

  • Heart rate variability (HRV) was measured in healthy (n=34), dysmenorrheic (n=103), and BPS (n=23) participants during a bladder-filling task in their luteal phase.
  • Bladder pain sensitivity, heart rate, diastolic blood pressure, and HRV were assessed.
  • Changes in heart rate from maximum bladder capacity to after micturition were analyzed.

Main Results:

  • Both dysmenorrheic and BPS participants exhibited significantly increased bladder pain sensitivity compared to controls (p<0.001).
  • Dysmenorrheic and BPS groups showed increased heart rate (p<0.01), increased diastolic blood pressure (p<0.01), and reduced HRV (p<0.05) versus controls.
  • Dysmenorrheic participants displayed minimal heart rate change between maximum bladder capacity and after micturition (p=0.013) compared to controls.

Conclusions:

  • Menstrual pain is associated with abnormal autonomic activity and heightened bladder sensitivity, persisting even two weeks after menses.
  • Autonomic dysfunction observed in both dysmenorrhea and BPS suggests a common pathway for visceral pain development.
  • These findings highlight the need to investigate the origins of autonomic imbalance, potentially starting in adolescence, for early intervention strategies.