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Alterations in Muscle Tone lll01:11

Alterations in Muscle Tone lll

Rigidity and myotonia are distinct abnormalities of muscle tone that affect resistance and relaxation during movement. Although both involve altered muscle contraction, they arise from different neurological and muscular mechanisms.CharacteristicsRigidity is characterized by uniform resistance to passive movement across the entire range, independent of speed, affecting flexors and extensors equally. It may appear as lead-pipe rigidity (smooth, constant resistance) or cogwheel rigidity...
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AssessmentA comprehensive assessment is essential in managing a patient with rheumatic heart disease (RHD). Begin with obtaining a detailed medical history, including recent streptococcal infections, a history of rheumatic fever, or previously diagnosed rheumatic heart disease. Assess the patient for symptoms such as fever, chest pain, widespread joint pain (arthralgia), tachycardia, pericardial friction rub, muffled heart sounds, heart murmurs, peripheral edema, subcutaneous nodules, and...
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Updated: Jun 29, 2026

Description of a Swine Infant Model of Volume-Controlled Hemorrhagic Shock
09:09

Description of a Swine Infant Model of Volume-Controlled Hemorrhagic Shock

Published on: November 3, 2023

Shaking rigors in parturients.

Michael D Benson1, Elaine Haney, Mara Dinsmoor

  • 1Department of Obstetrics and Gynecology, Evanston Northwestern Healthcare, Feinberg School of Medicine, Northwestern University, Chicago, Illinois, USA. benson.michael@comcast.net

The Journal of Reproductive Medicine
|October 9, 2008
PubMed
Summary
This summary is machine-generated.

Over half of women giving birth experienced shaking rigors. Epidural use and maternal fever were linked to a higher risk and more frequent rigor episodes during labor.

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Area of Science:

  • Obstetrics and Gynecology
  • Perinatal Medicine
  • Clinical Nursing

Background:

  • Shaking rigors are a common, yet not fully understood, physiological response during labor.
  • Understanding the factors associated with rigors is crucial for optimizing maternal care during parturition.

Purpose of the Study:

  • To determine the incidence, duration, and timing of shaking rigors in parturients.
  • To investigate associations between shaking rigors and key clinical variables during labor.

Main Methods:

  • Observational study of 467 term, singleton parturients over 13 months.
  • Labor nurses recorded shaking rigors and 13 clinical variables, including labor length.
  • Multiple regression analysis and temporal examination of rigors and labor events were performed.

Main Results:

  • 57% of parturients experienced at least one rigor episode.
  • Epidural anesthesia use was associated with increased rigor risk, duration, and number.
  • Elevated maternal temperature and epidural administration were identified as antecedent events to rigors.

Conclusions:

  • Shaking rigors occur in over half of women during labor.
  • Epidural analgesia and maternal fever are significantly associated with an increased likelihood and frequency of rigors.