Talk to us?

General Surgery NEET MDS Synopsis - Lecture Notes
Practice Subscribe 👤 Welcome User

📖 General Surgery

Showing page 1 of 5 (20 total records)

 INFLAMMATION

General Surgery

Inflammation is the respone of the body to an irritant.

Stages of Inflammation

1. General: Temperature Raised. In severe cases bacteremia or septicemia ,rigors may occur.

2. Local: classical signs of inflammation are due to hyperemia and inflammation exudate

i) Heat:  inflammed area feels warmer than the surrounding tissues.

ii) Redness

iii) Tenderness: Due to pressure of exudate on the surrounding nerves  If the exudate is  under tension, e.g. a furuncle (boil) of the ear, pain is severe.

iv) swelling

v) Loss of function.

The termination of Inflammation

This may be by:1. Resolution 2. Suppuration 3. Ulceration 4. Ganangren s. Fibrosis

Management

i. Increase the patients resistance., Rest,  Relief of pain by analgesics,  Diet: High protein and high calorie diet with vitamins,  Antibiotics,  Prevent further contamination of wound.

Surgical measures

1. Excision: If possible as in appendicectomy.

2. Incision and drainage: If an abscess forms.

Types of Head Injury
General Surgery

Types of Head Injury

1. Extradural Hematoma (EDH)

Overview

  • Demographics: Most common in young male patients.
  • Association: Always associated with skull fractures.
  • Injured Vessel: Middle meningeal artery.
  • Common Site of Injury: Temporal bone at the pterion (the thinnest part of the skull), which overlies the middle meningeal artery.
  • Location of Hematoma: Between the bone and the dura mater.

Other Common Sites

  1. Frontal fossa
  2. Posterior fossa
  3. May occur following disruption of major dural venous sinus.

Classical Presentation

  • Initial Injury: Followed by a lucid interval where the patient may only complain of a headache.
  • Deterioration: After minutes to hours, rapid deterioration occurs, leading to:
    • Contralateral hemiparesis
    • Reduced consciousness level
    • Ipsilateral pupillary dilatation (due to herniation)

Imaging

  • CT Scan: Shows a lentiform (lens-shaped or biconvex) hyperdense lesion between the brain and skull.

Treatment

  • Surgical Intervention: Immediate surgical evacuation via craniotomy.
  • Mortality Rate: Overall mortality is 18% for all cases of EDH, but only 2% for isolated EDH.

2. Acute Subdural Hematoma (ASDH)

Overview

  • Location: Accumulates in the space between the dura and arachnoid.
  • Injury Mechanism: Associated with cortical vessel disruption and brain laceration.
  • Primary Brain Injury: Often associated with primary brain injury.

Presentation

  • Consciousness: Impaired consciousness from the time of impact.

Imaging

  • CT Scan: Appears hyperdense, with hematoma spreading diffusely and having a concavo-convex appearance.

Treatment

  • Surgical Intervention: Evacuation via craniotomy.
  • Mortality Rate: Approximately 40%.

3. Chronic Subdural Hematoma (CSDH)

Overview

  • Demographics: Most common in patients on anticoagulants and antiplatelet agents.
  • History: Often follows a minor head injury weeks to months prior.
  • Pathology: Due to the tear of bridging veins leading to ASDH, which is clinically silent. As the hematoma breaks down, it increases in volume, causing mass effect on the underlying brain.

Clinical Features

  • Symptoms may include:
    • Headache
    • Cognitive decline
    • Focal neurological deficits (FND)
    • Seizures
  • Important to exclude endocrine, hypoxic, and metabolic causes in this group.

Imaging

  • CT Scan Appearance:
    • Acute blood (0–10 days): Hyperdense
    • Subacute blood (10 days to 2 weeks): Isodense
    • Chronic (> 2 weeks): Hypodense

Treatment

  • Surgical Intervention: Bur hole evacuation rather than craniotomy.
  • Anesthesia: Elderly patients can often undergo surgery under local anesthesia, despite comorbidities.

4. Subarachnoid Hemorrhage (SAH)

Overview

  • Causes: Most commonly due to aneurysms for spontaneous SAH, but trauma is the most common cause overall.
  • Management: Conservative treatment is often employed for trauma cases.

5. Cerebral Contusions

Overview

  • Definition: Bruising of the brain tissue due to trauma.
  • Mechanism: Often occurs at the site of impact (coup) and the opposite side (contrecoup).
  • Symptoms: Can range from mild confusion to severe neurological deficits depending on the extent of the injury.

Imaging

  • CT Scan: May show areas of low attenuation (hypodense) or high attenuation (hyperdense) depending on the age of the contusion.

Treatment

  • Management: Depends on the severity and associated injuries; may require surgical intervention if there is significant mass effect.
Zygomatic Bone Reduction
General Surgery

Zygomatic Bone Reduction

When performing a reduction of the zygomatic bone, particularly in the context of maxillary arch fractures, several key checkpoints are used to assess the success of the procedure. Here’s a detailed overview of the important checkpoints for both zygomatic bone and zygomatic arch reduction.

Zygomatic Bone Reduction

  1. Alignment at the Sphenozygomatic Suture:

    • While this is considered the best checkpoint for assessing the reduction of the zygomatic bone, it may not always be the most practical or available option in certain clinical scenarios.

  2. Symmetry of the Zygomatic Arch:

    • Importance: This is the second-best checkpoint and serves multiple purposes:
      • Maintains Interzygomatic Distance: Ensures that the distance between the zygomatic bones is preserved, which is crucial for facial symmetry.
      • Maintains Facial Symmetry and Aesthetic Balance: A symmetrical zygomatic arch contributes to the overall aesthetic appearance of the face.
      • Preserves the Dome Effect: The prominence of the zygomatic arch creates a natural contour that is important for facial aesthetics.

  3. Continuity of the Infraorbital Rim:

    • A critical checkpoint indicating that the reduction is complete. The infraorbital rim should show no step-off, indicating proper alignment and continuity.

  4. Continuity at the Frontozygomatic Suture:

    • Ensures that the junction between the frontal bone and the zygomatic bone is intact and properly aligned.

  5. Continuity at the Zygomatic Buttress Region:

    • The zygomatic buttress is an important structural component that provides support and stability to the zygomatic bone.

Zygomatic Arch Reduction

  1. Click Sound:

    • The presence of a click sound during manipulation can indicate proper alignment and reduction of the zygomatic arch.

  2. Symmetry of the Arches:

    • Assessing the symmetry of the zygomatic arches on both sides of the face is crucial for ensuring that the reduction has been successful and that the facial aesthetics are preserved.
Walsham’s Forceps
General Surgery

Walsham’s Forceps

Walsham’s forceps are specialized surgical instruments used primarily in the manipulation and reduction of fractured nasal fragments. They are particularly useful in the management of nasal fractures, allowing for precise adjustment and stabilization of the bone fragments during the reduction process.

  1. Design:

    • Curved Blades: Walsham’s forceps feature two curved blades—one padded and one unpadded. The curvature of the blades allows for better access and manipulation of the nasal structures.
    • Padded Blade: The padded blade is designed to provide a gentle grip on the external surface of the nasal bone and surrounding tissues, minimizing trauma during manipulation.
    • Unpadded Blade: The unpadded blade is inserted into the nostril and is used to secure the internal aspect of the nasal bone and associated fragments.

  2. Usage:

    • Insertion: The unpadded blade is carefully passed up the nostril to reach the fractured nasal bone and the associated fragment of the frontal process of the maxilla.
    • Securing Fragments: Once in position, the nasal bone and the associated fragment are secured between the padded blade externally and the unpadded blade internally.
    • Manipulation: The surgeon can then manipulate the fragments into their correct anatomical position, ensuring proper alignment and stabilization.

  3. Indications:

    • Walsham’s forceps are indicated for use in cases of nasal fractures, particularly when there is displacement of the nasal bones or associated structures. They are commonly used in both emergency and elective settings for nasal fracture management.

  4. Advantages:

    • Precision: The design of the forceps allows for precise manipulation of the nasal fragments, which is crucial for achieving optimal alignment and aesthetic outcomes.
    • Minimized Trauma: The padded blade helps to reduce trauma to the surrounding soft tissues, which can be a concern during the reduction of nasal fractures.

  5. Postoperative Considerations:

    • After manipulation and reduction of the nasal fragments, appropriate postoperative care is essential to monitor for complications such as swelling, infection, or malunion. Follow-up appointments may be necessary to assess healing and ensure that the nasal structure remains stable.