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Analgesia and Pain Management01:25

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Pain is critical to various clinical pathologies, provoking an urgent need for effective management. Pain, whether acute or chronic, is a complex neurochemical process. Its alleviation depends on the type, with nonopioid analgesics effective for mild to moderate pain, such as musculoskeletal or inflammatory pain, while neuropathic pain responds best to anticonvulsants, tricyclic antidepressants, or serotonin/norepinephrine reuptake inhibitors. For severe acute or chronic pain, opioids may be...
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In an underdamped second-order system, where the damping ratio ζ is between 0 and 1, a unit-step input results in a transfer function that, when transformed using the inverse Laplace method, reveals the output response. The output exhibits a damped sinusoidal oscillation, and the difference between the input and output is termed the error signal. This error signal also demonstrates damped oscillatory behavior. Eventually, as the system reaches a steady state, the error diminishes to zero.
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First-order systems, such as RC circuits, are foundational in understanding dynamic systems due to their straightforward input-output relationship. Analyzing their responses to different input functions under zero initial conditions reveals significant insights into system behavior.
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A servo system exemplifies a second-order system, featuring a proportional controller and load elements that ensure the output position aligns with the input position. The relationship between these components is described by a second-order differential equation. Applying the Laplace transform under zero initial conditions yields the transfer function, showing how inputs are converted to outputs in the system.
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A thermodynamic system is a set of objects whose thermodynamic properties are of interest. The system is considered to be embedded in its surroundings or the environment. The system and its environment can exchange heat and do work on each other through a boundary that separates them. However, the immediate surroundings of the system interact with it directly and therefore have a much stronger influence on its behavior and properties.
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Linearity is a system property characterized by a direct input-output relationship, combining homogeneity and additivity.
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An Improved Time- and Labor- Efficient Protocol for Mouse Primary Hepatocyte Isolation
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Options for systemic labor analgesia.

Shmuel Evron1, Tiberiu Ezri

  • 1Department of Anesthesia, Edith Wolfson Medical Center, Holon, affiliated to Sackler School of Medicine, Tel Aviv University, Tel Aviv, Israel.

Current Opinion in Anaesthesiology
|May 5, 2007
PubMed
Summary
This summary is machine-generated.

Remifentanil offers a promising alternative for labor pain relief, potentially surpassing traditional opioids. Careful monitoring is essential to manage risks of hypoxemia in mothers and newborns during labor analgesia.

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Area of Science:

  • Obstetrics and Gynecology
  • Pharmacology
  • Pain Management

Background:

  • Systemic opioids have historically been used for labor analgesia but are less favored due to maternal and neonatal side effects.
  • Patient-controlled intravenous analgesia with fentanyl or sufentanil is currently preferred for early labor when epidural analgesia is not feasible.

Purpose of the Study:

  • To review systemic analgesia as an alternative to epidural analgesia for labor pain.
  • To evaluate remifentanil within the context of opioid analgesics for managing labor pain.

Main Methods:

  • Literature review of systemic analgesia practices in labor.
  • Analysis of remifentanil's pharmacokinetics, administration, and clinical use in obstetric analgesia.

Main Results:

  • Remifentanil shows advantages in ease of administration and predictable pharmacokinetics.
  • Studies suggest potential for improved neonatal outcomes with remifentanil compared to other opioids.
  • Increasing research highlights remifentanil's role in obstetric pain management.

Conclusions:

  • Remifentanil is emerging as a popular and potentially superior opioid for labor analgesia.
  • Close maternal and neonatal monitoring is crucial to mitigate risks of hypoxemia associated with remifentanil use.