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Directing Effect of Substituents: meta-Directing Groups01:09

Directing Effect of Substituents: meta-Directing Groups

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Substituents on the benzene ring that direct an incoming electrophile to undergo substitution at the meta position are called meta directors. All meta directors either have a positive charge on the atom directly bonded to the ring or a partial positive charge. These groups function by withdrawing electrons from the ring through inductive and resonance effects. Consider the carbocation intermediates formed upon the addition of an electrophile on nitrobenzene at the...
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Directing Effect of Substituents: ortho–para-Directing Groups01:14

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Ortho–para directors are substituent groups attached to the benzene ring and direct the addition of an electrophile to the positions ortho or para to the substituent. All electron-donating groups are considered ortho–para directors. They donate electrons to the ring and make the ring more electron-rich. The ring is therefore susceptible to the addition of electrophiles. Substituents such as amino, hydroxy, or alkoxy, containing lone pairs on the atom adjacent to the ring, donate...
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Porin Insertion in the Outer Mitochondrial Membrane01:12

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Porins are beta-barrel proteins translocated to the mitochondrial outer membrane through the TOM complex into the intermembrane space. Porin precursors bind TIM chaperones within the intermembrane space and are guided to the Sorting and Assembly Machinery complex or SAM complex on the outer mitochondrial membrane.
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Directional Terms01:14

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Directional terms are essential for describing the relative locations of different body structures. For instance, an anatomist might describe one band of tissue as "inferior to" another, or a physician might describe a tumor as "superficial to" a deeper body structure. These terms often use comparative terms in pairs to trace out the relative locations of one body part to another or descriptions of body tissues like the deeper ones from superficially present with reference to...
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Directional relays, essential for managing unidirectional fault currents, enhance the safety and efficiency of power systems. On power lines equipped with directional relays, faults downstream (to the right) of the current transformer typically cause the fault current to lag the bus voltage by approximately 90 degrees, known as the forward direction. In contrast, upstream (left-side) faults may result in the fault current leading the bus voltage by nearly 90 degrees, termed the reverse...
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Integral membrane proteins are proteins adhered to the lipid bilayer of a cell organelle or membrane. They can be of two types: transmembrane integral proteins that span the lipid bilayer and monotopic proteins that are attached to either side of the membrane but do not pass through it.
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Laparoscopic Access: Direct Trocar Insertion Versus Open Technique.

Sumesh Kaistha1, Ameet Kumar2, Rajesh Gangavatiker2

  • 11 Department of Surgical Gastroenterology, Command Hospital, Lucknow, India.

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|January 11, 2019
PubMed
Summary

Direct trocar insertion (DTI) is a safe and efficient laparoscopic surgery technique. This study found DTI comparable to open access technique (OAT) for major complications, with faster access and fewer minor issues.

Keywords:
complicationsdirect trocar insertionlaparoscopic accessopen accesspneumoperitoneum

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Area of Science:

  • Minimally Invasive Surgery
  • Surgical Techniques
  • Laparoscopic Access

Background:

  • Laparoscopic surgery requires safe creation of pneumoperitoneum.
  • Common access methods include Veress needle, open access technique (OAT), direct trocar insertion (DTI), and optical port.
  • DTI is underutilized due to concerns about its blind nature.

Purpose of the Study:

  • To compare the feasibility and complication rates of DTI versus OAT for laparoscopic procedures.
  • To evaluate DTI's safety and effectiveness in gaining peritoneal access.

Main Methods:

  • A randomized study involving 955 participants comparing DTI (Group A) and OAT (Group B).
  • Primary endpoint: major complications (bowel, major vessel, solid organ injury).
  • Secondary endpoints: port access time, minor port-site complications; assessed postoperatively and up to one year.

Main Results:

  • No significant difference in major complications between DTI and OAT groups.
  • DTI demonstrated significantly shorter port access time (P=.01).
  • DTI showed superiority in reducing umbilical port-site hernia, infection, and pain (P=.01).

Conclusions:

  • DTI is a safe and effective laparoscopic access technique.
  • The study supports wider adoption of DTI by surgeons.
  • DTI offers advantages in efficiency and patient comfort compared to OAT.