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Related Concept Videos

Directly Acting Muscle Relaxants: Dantrolene and Botulinum Toxin01:26

Directly Acting Muscle Relaxants: Dantrolene and Botulinum Toxin

Directly acting muscle relaxants like dantrolene and botulinum toxin (BoNT) have distinct mechanisms and applications. Dantrolene, a hydantoin derivative, acts on the ryanodine receptor (RYR1) in skeletal muscle cells. RYR1 are calcium channels present at the sarcoplasmic reticulum membrane. In response to excitation, they release calcium ions from the sarcoplasmic reticulum to the cytosol. Calcium promotes actin-myosin-mediated contraction of muscles.
The binding of dantrolene to the RYR1...
Botulism01:22

Botulism

Botulism is a life-threatening neuroparalytic condition caused by botulinum neurotoxin, which is produced by the bacterium Clostridium botulinum, a Gram-positive, spore-forming, obligate anaerobe.In adults, the toxin enters the body in different ways: in foodborne botulism, the preformed toxin is absorbed in the intestine. In wound botulism, spores grow in injured tissue and release the toxin into the blood. Infant botulism differs mechanistically from adult forms. In infants, botulism commonly...
Skeletal Muscle Relaxants: Therapeutic Uses01:31

Skeletal Muscle Relaxants: Therapeutic Uses

Skeletal muscle relaxants are used to relax muscle tone and alleviate painful muscle contractions. However, the choice of skeletal muscle relaxants depends on the duration of the surgical procedure in order to minimize potential side effects. Skeletal muscle relaxants like neuromuscular blocking agents [NMBAs] are commonly employed as adjuvants alongside general anesthetics in clinical settings. NMBAs are also used to maintain controlled ventilation during surgery of the larynx or pharynx as...
Nondepolarizing (Competitive) Neuromuscular Blockers: Pharmacological Actions01:27

Nondepolarizing (Competitive) Neuromuscular Blockers: Pharmacological Actions

Nondepolarizing neuromuscular blockers prevent the membrane depolarization of muscle cells and inhibit muscle contraction. These are usually administered with anesthetics to achieve complete muscle relaxation. Upon administration, these drugs first block the small, rapidly contracting muscles of the face and hands, followed by the larger muscles of the trunk and the intercostal muscles. The diaphragm is the last muscle to be affected.
Although all competitive neuromuscular blockers are designed...
Adrenergic Antagonists: Pharmacological Actions of ɑ-Receptor Blockers01:22

Adrenergic Antagonists: Pharmacological Actions of ɑ-Receptor Blockers

α-Adrenergic antagonists, known as α-blockers, exert their effects by inhibiting α-adrenoceptors, leading to specific physiological actions. α1-blockers and α2-blockers have distinct pharmacological actions and therapeutic applications.
α1-blockers: These drugs inhibit α1-adrenoceptors on smooth muscle cells, resulting in vasodilation. This vasodilation lowers blood pressure, making α1-blockers valuable in treating hypertension. Additionally, α1-blockers effectively address urinary obstruction...
Drugs Acting on Autonomic Ganglia: Blockers01:28

Drugs Acting on Autonomic Ganglia: Blockers

Ganglionic blockers inhibit autonomic activity by blocking nicotinic receptors in the autonomic ganglia, suppressing impulse transmission. These blockers lack selectivity between sympathetic and parasympathetic ganglia and are ineffective as neuromuscular junction antagonists. They can be categorized into two groups:

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Updated: Jun 19, 2026

Surgical Treatment for Benign Prostatic Hyperplasia: Holmium Laser Enucleation of the Prostate (HoLEP).
06:04

Surgical Treatment for Benign Prostatic Hyperplasia: Holmium Laser Enucleation of the Prostate (HoLEP).

Published on: March 6, 2018

Botulinum neurotoxin A for benign prostatic hyperplasia.

Athanassios Oeconomou1, Helmut Madersbacher

  • 1Department of Urology, University of Thessalia School of Medicine, Larissa, Greece. thaoik@hotmail.com

Current Opinion in Urology
|November 6, 2009
PubMed
Summary

Botulinum neurotoxin A (BoNT-A) injections show promise for treating benign prostatic hyperplasia (BPH) symptoms by relaxing the prostate. While early clinical results are encouraging, further large-scale studies are needed to confirm efficacy and safety.

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Ultrasonography of the Adult Male Urinary Tract for Urinary Functional Testing
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Ultrasonography of the Adult Male Urinary Tract for Urinary Functional Testing

Published on: August 14, 2019

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Last Updated: Jun 19, 2026

Surgical Treatment for Benign Prostatic Hyperplasia: Holmium Laser Enucleation of the Prostate (HoLEP).
06:04

Surgical Treatment for Benign Prostatic Hyperplasia: Holmium Laser Enucleation of the Prostate (HoLEP).

Published on: March 6, 2018

Ultrasonography of the Adult Male Urinary Tract for Urinary Functional Testing
05:25

Ultrasonography of the Adult Male Urinary Tract for Urinary Functional Testing

Published on: August 14, 2019

Area of Science:

  • Urology
  • Pharmacology

Background:

  • Benign prostatic hyperplasia (BPH) significantly impacts lower urinary tract symptoms.
  • Current BPH treatments have limitations, driving interest in novel therapies.
  • Botulinum neurotoxin A (BoNT-A) is being explored as a minimally invasive option.

Purpose of the Study:

  • To review animal studies on BoNT-A's mechanisms in inhibiting BPH progression.
  • To summarize clinical findings on the efficacy and safety of intraprostatic BoNT-A injections.
  • To assess the potential of BoNT-A as an alternative BPH treatment.

Main Methods:

  • Review of experimental animal studies investigating BoNT-A's effects on prostate tissue and function.
  • Analysis of published clinical trials evaluating intraprostatic BoNT-A injection protocols.
  • Assessment of reported symptomatic relief and objective parameter improvements.

Main Results:

  • Animal studies indicate BoNT-A induces prostate relaxation, atrophy, and size reduction via autonomic nervous system inhibition.
  • Potential symptom reduction may involve inhibiting sensory nerve signals from the prostate.
  • Clinical studies report symptomatic improvement and favorable outcomes, with rare side effects.

Conclusions:

  • Intraprostatic BoNT-A injection is an experimental therapy for BPH.
  • Clinical evidence, though encouraging, is currently of low quality.
  • Large-scale, randomized, placebo-controlled trials with long-term follow-up are essential for validation and potential registration.