Cirugia General - Sesion 2 - Hernias, Apendicitis y Peritonitis - Andrés Pacherres - 2026-1

Introduction to Hernias and Appendicitis

Overview of Topics

• The session will cover hernias, appendicitis, and a brief mention of peritonitis, which will be summarized in one slide.

• The speaker encourages interaction and aims to optimize time for the audience's understanding. A surprise resource related to the inguinal canal will be shared later.

Anatomy of the Abdominal Wall

Key Anatomical Structures

• Discussion begins with abdominal wall anatomy, including layers such as skin, subcutaneous tissue (Camper's fascia and Scarpa's fascia), and muscle layers.

• Important structures include external oblique, internal oblique, and transversus abdominis muscles; these are crucial for understanding hernia formation.

Fascia Identification

• Camper’s fascia is identified as adipose tissue (indicated by 'A'), while Scarpa’s fascia is fibrous ('R'). This mnemonic aids in remembering their characteristics.

Inguinal Region Details

Oblique Muscles' Role

• The external oblique relates to the inguinal ligament and superficial inguinal ring; this relationship is critical for hernia identification.

• Internal oblique merges with transversus abdominis to form the conjoint tendon leading to cremaster muscle development.

Preperitoneal Space

Clinical Relevance

• The preperitoneal space (Rexius space) lies behind the pubis but in front of the bladder; it may be relevant during surgical approaches for direct hernia repair using mesh techniques.

• Mentioned anatomical structures include Santorini venous plexus which could appear on exams but is less relevant for hernias specifically.

Hernia Types: Direct vs Indirect

Distinguishing Features

• Superficial inguinal ring and deep inguinal ring are highlighted; important nerves like ilioinguinal nerve are prone to damage during surgical procedures involving hernias.

• Inferior epigastric vessels help differentiate between direct (medial) and indirect (lateral) hernias based on their location relative to these vessels.

Inguinal Ligament Significance

Classification of Hernias

• Above the inguinal ligament are inguinal hernias; below are femoral hernias—both types frequently tested in examinations.

Femoral Ring Anatomy

Understanding Femoral Hernias

• The femoral ring anatomy includes lacunar ligament, pectineal ligament, and femoral nerve positioning—important landmarks when discussing femoral hernias versus inguinal ones.

Components of Inguinal Canal

Structural Overview

• An overview of components within the inguinal canal: anterior wall formed by external oblique aponeurosis, posterior wall by transversalis fascia, roof by conjoint tendon, floor by inguinal ligament is provided here for clarity on surgical approaches or clinical questions regarding anatomy.

Content Passing Through Inguinal Canal

Key Contents

• The contents passing through include spermatic cord or round ligament; understanding this helps clarify potential complications during surgeries involving these structures.

Types of Hernias

Classification System

• Hernias can be classified into reducible or irreducible categories based on whether they can return through their defect after being pushed back.

• Reducible can further divide into coercible (can reduce easily upon pressure) or incoercible (reduces but returns). Irreducibles lead towards incarceration or strangulation scenarios that require urgent attention.

Clinical Presentation & Symptoms

Symptoms Overview

• Symptoms range from asymptomatic presentations to significant pain indicating possible incarceration or strangulation leading towards intestinal obstruction requiring immediate intervention.

Treatment Approaches

Surgical Interventions

• Management principles involve invaginating sac contents while reinforcing affected walls via tension-free techniques using mesh implants versus traditional suturing methods depending on individual cases.

• Indications for surgery include symptomatic presentations especially if strangulated or emergency situations arise due to compromised blood flow necessitating prompt action.

Técnicas de Contención en Hernias

Introducción a las técnicas de contención

• Se presentan tres técnicas principales para la contención de hernias: Basini, McBay y Showd. Es importante recordar qué estructuras se utilizan en cada técnica.

• La técnica de Basini utiliza el tendón conjunto y el ligamento inguinal, mientras que McBay incorpora el ligamento de Cooper.

Técnicas sin tensión

• La técnica más común es la de Lenstein, que sutura el ligamento inguinal y el tendón conjunto con una malla. Esta técnica es similar a la de Basini pero incluye una malla.

• La técnica de Naikus busca crear una malla entre la fascia transversalis y el peritoneo, utilizada principalmente para recidivas.

• La técnica de Stop está indicada para hernias bilaterales y se caracteriza por su doble P.

Técnicas laparoscópicas

• Las técnicas laparoscópicas incluyen TEP (totalmente extraperitoneal) y TAP (transabdominal preperitoneal). Ambas son efectivas para evitar recurrencias.

• El TEP no entra en la cavidad peritoneal, lo que minimiza la exposición a vísceras.

Misceláneas sobre Hernias

Tipos menos comunes de hernias

• La hernia de Litre contiene un divertículo; puede ser directa o indirecta.

• La hernia Garen involucra al apéndice dentro del saco herniario, usualmente femoral.

• Otras tipos incluyen la hernia obturadora, que comprime el nervio obturador.

Complicaciones postoperatorias

• Los seromas y hematomas son complicaciones comunes tras cirugía abierta, ocurriendo en aproximadamente 30% de los casos.

• Otros riesgos incluyen retención urinaria e infecciones del sitio quirúrgico, especialmente en pacientes con diabetes u obesidad.

Riesgos Asociados a Hernias

Lesiones nerviosas y recurrencia

• El nervio ilioinguinal es el más afectado durante las cirugías. También pueden lesionarse otros nervios como el hipogástrico o genitofemoral.

• Las malas colocaciones de mallas pueden llevar a recurrencias; también hay riesgo menor de orquitis o fístulas.

Preguntas sobre Hernias

Evaluación clínica

• Un caso clínico describe una hernia estrangulada con compromiso vascular evidente; esto requiere cirugía urgente sin reducción manual previa.

Diagnóstico diferencial

• En otro caso se diagnostica una hernia femoral electiva debido al alto riesgo asociado con esta condición.

Resumen Final sobre Hernias

Conceptos clave revisados

• Diferenciación entre tipos directos e indirectos según su relación con los vasos epigástricos inferiores es crucial para diagnóstico correcto.

Apendicitis: Generalidades

Anatomía del Apéndice

• El apéndice es un órgano intraperitoneal ubicado en la convergencia de las tenas del ciego; mide entre 8 a 9 cm con un diámetro normal entre 4 a 8 mm.

Causas Comunes

• E.coli es uno de los principales agentes causales junto con Pseudomonas aeruginosa; infecciones suelen ser polimicrobianas incluyendo anaerobios como Bacteroides fragilis.

Posiciones del Apéndice

• Las posiciones retrocecal y pélvica son las más frecuentes; cada posición presenta síntomas específicos asociados al dolor abdominal típico.

Fisiopatología de Apendicitis

Proceso Patológico

• Una obstrucción inicial lleva a distensión del apéndice, comprometiendo drenaje venoso e irrigación arterial; esto puede resultar en necrosis si no se trata adecuadamente.

Complicaciones Potenciales

• Puede haber perforación llevando a peritonitis o formación de abscesos/plastros dependiendo del manejo clínico posterior al diagnóstico inicial.

Understanding Appendicitis: Phases and Symptoms

Phases of Appendicitis

• Apendicitis has four distinct phases: congestive (catarrhal), suppurative (phlegmonous), gangrenous (necrotic), and perforated.

• In the congestive phase, mucus accumulates, obstructing the lumen, leading to increased distal pressure, venous drainage alteration, edema, and ischemia. This correlates with visceral pain and symptoms like anorexia and nausea.

• The progression includes bacterial proliferation causing exudate that irritates the parietal peritoneum, resulting in somatic pain. McBurney's point becomes significant during this phase.

• The gangrenous phase is characterized by full-thickness wall obstruction and progressive venous thrombosis. Systemic signs such as fever, tachycardia, and leukocytosis emerge.

• Perforation leads to abdominal cavity contamination causing peritonitis; rigidity or abscess formation may occur.

Classic Pain Migration

• Typical patient presentation involves young adults with initial periumbilical pain that migrates to the right iliac fossa accompanied by nausea/vomiting and subsequent fever.

• Anorexia is an early sign; if fever precedes abdominal pain migration to the right side, it suggests a diagnosis other than appendicitis due to altered physiological sequence.

Key Clinical Signs

• Important semiological signs include McBurney's point tenderness indicating sensitivity at a specific location between umbilicus and anterior superior iliac spine.

• Blumberg's sign indicates rebound tenderness for peritonitis assessment; Rovsing’s sign shows referred pain when palpating the left iliac fossa.

Diagnostic Tools for Appendicitis

Alvarado Score

• The Alvarado score helps assess appendicitis risk: 5–6 points indicate possible appendicitis; 7–8 points suggest probable; 9+ points are nearly confirmed cases.

• Key components contributing maximum points include right iliac fossa pain and leukocytosis.

Imaging Techniques

• For suspected appendicitis based on Alvarado scoring of 5–6 points, ultrasound is first-line imaging; CT scan serves as gold standard for confirmation.

Management Strategies for Appendicitis

Preoperative Care

• Initial management includes NPO status (nothing by mouth), hydration with IV fluids, analgesics for comfort without masking symptoms, antiemetics, and preoperative antibiotics targeting anaerobes like Bacteroides spp.

Surgical Considerations

• Non-complicated appendicitis can be managed conservatively with antibiotics alone up until the suppurative phase. Complicated cases require surgical intervention.

Complications of Appendicitis

Delayed Presentation

• Patients presenting late may have complications such as abscess formation or plastron development requiring careful management including potential drainage or interval appendectomy after stabilization.

Postoperative Protocol

• In cases of perforated appendicitis confirmed via imaging or intraoperatively, aspiration of pus is preferred over routine drainage unless an abscess necessitates it.

Peritonitis Overview

Types of Peritonitis

• Primary: Caused by hematogenous spread or translocation from intestines; typically involves E. coli or Klebsiella species treated with third-generation cephalosporins.

• Secondary: Results from conditions like diverticulitis or post-surgical complications leading to polymicrobial infections requiring broad-spectrum antibiotic therapy.

Conclusion

This summary encapsulates critical insights into understanding appendicitis through its phases, clinical presentations, diagnostic tools like the Alvarado score, management strategies including surgical interventions when necessary, along with considerations regarding complications such as peritonitis.