from docx import Document
from docx.shared import Pt, Inches, RGBColor, Cm
from docx.enum.text import WD_ALIGN_PARAGRAPH
from docx.enum.style import WD_STYLE_TYPE
from docx.oxml.ns import qn
from docx.oxml import OxmlElement
import copy

doc = Document()

# ── Page margins ──────────────────────────────────────────────────────────────
section = doc.sections[0]
section.page_width  = Inches(8.5)
section.page_height = Inches(11)
section.left_margin   = Inches(1.25)
section.right_margin  = Inches(1.0)
section.top_margin    = Inches(1.0)
section.bottom_margin = Inches(1.0)

# ── Base Normal style ─────────────────────────────────────────────────────────
normal = doc.styles["Normal"]
normal.font.name = "Times New Roman"
normal.font.size = Pt(12)
normal.paragraph_format.line_spacing = Pt(24)   # double-space
normal.paragraph_format.space_after  = Pt(0)

# ── Helper: add a styled heading ──────────────────────────────────────────────
def add_heading(text, level=1, center=False):
    p = doc.add_heading(text, level=level)
    p.style.font.name = "Times New Roman"
    run = p.runs[0] if p.runs else p.add_run(text)
    run.font.name  = "Times New Roman"
    run.font.bold  = True
    run.font.color.rgb = RGBColor(0, 0, 0)
    if level == 1:
        run.font.size = Pt(14)
    elif level == 2:
        run.font.size = Pt(13)
    else:
        run.font.size = Pt(12)
    if center:
        p.alignment = WD_ALIGN_PARAGRAPH.CENTER
    else:
        p.alignment = WD_ALIGN_PARAGRAPH.LEFT
    return p

# ── Helper: add body paragraph ────────────────────────────────────────────────
def add_para(text, indent=True, justify=True):
    p = doc.add_paragraph()
    if indent:
        p.paragraph_format.first_line_indent = Inches(0.5)
    p.paragraph_format.line_spacing = Pt(24)
    p.paragraph_format.space_after  = Pt(6)
    if justify:
        p.alignment = WD_ALIGN_PARAGRAPH.JUSTIFY
    run = p.add_run(text)
    run.font.name = "Times New Roman"
    run.font.size = Pt(12)
    return p

# ── Helper: add sub-heading (bold inline) ────────────────────────────────────
def add_subheading(text):
    p = doc.add_paragraph()
    p.paragraph_format.line_spacing = Pt(24)
    p.paragraph_format.space_before = Pt(12)
    p.paragraph_format.space_after  = Pt(4)
    run = p.add_run(text)
    run.font.name = "Times New Roman"
    run.font.size = Pt(12)
    run.font.bold = True
    return p

# ── Helper: reference paragraph ───────────────────────────────────────────────
def add_ref(number, text):
    p = doc.add_paragraph(style="Normal")
    p.paragraph_format.first_line_indent = Inches(-0.4)
    p.paragraph_format.left_indent       = Inches(0.4)
    p.paragraph_format.line_spacing      = Pt(22)
    p.paragraph_format.space_after       = Pt(4)
    p.alignment = WD_ALIGN_PARAGRAPH.JUSTIFY
    run = p.add_run(f"{number}. {text}")
    run.font.name = "Times New Roman"
    run.font.size = Pt(11)
    return p

# ═══════════════════════════════════════════════════════════════════════════════
# TITLE PAGE
# ═══════════════════════════════════════════════════════════════════════════════
for _ in range(4):
    doc.add_paragraph()

t = doc.add_paragraph()
t.alignment = WD_ALIGN_PARAGRAPH.CENTER
r = t.add_run("PREDICTORS OF INTRAOPERATIVE CONVERSION FROM\nLAPAROSCOPIC TO OPEN APPENDECTOMY:\nA PROSPECTIVE OBSERVATIONAL STUDY")
r.font.name  = "Times New Roman"
r.font.size  = Pt(16)
r.font.bold  = True
r.font.color.rgb = RGBColor(0,0,0)

for _ in range(3):
    doc.add_paragraph()

sub = doc.add_paragraph()
sub.alignment = WD_ALIGN_PARAGRAPH.CENTER
r2 = sub.add_run("A Thesis Submitted in Partial Fulfillment of the Requirements\nfor the Degree of Master of Surgery (M.S.)\nin General Surgery")
r2.font.name = "Times New Roman"
r2.font.size = Pt(13)

for _ in range(3):
    doc.add_paragraph()

inst = doc.add_paragraph()
inst.alignment = WD_ALIGN_PARAGRAPH.CENTER
r3 = inst.add_run("[Name of University / Medical College]\n[Department of Surgery]\n[Year]")
r3.font.name = "Times New Roman"
r3.font.size = Pt(12)

doc.add_page_break()

# ═══════════════════════════════════════════════════════════════════════════════
# TABLE OF CONTENTS (manual)
# ═══════════════════════════════════════════════════════════════════════════════
add_heading("TABLE OF CONTENTS", level=1, center=True)
doc.add_paragraph()
toc_items = [
    ("Chapter 1: Introduction", "1"),
    ("    1.1  Background and Significance", "1"),
    ("    1.2  Magnitude of the Problem", "2"),
    ("    1.3  Rationale of the Study", "3"),
    ("    1.4  Aims and Objectives", "4"),
    ("Chapter 2: Review of Literature", "5"),
    ("    2.1  Historical Perspective", "5"),
    ("    2.2  Laparoscopic Appendectomy: Techniques and Advantages", "6"),
    ("    2.3  Incidence and Rates of Conversion", "8"),
    ("    2.4  Patient-Related (Demographic) Predictors", "9"),
    ("    2.5  Clinical and Laboratory Predictors", "11"),
    ("    2.6  Imaging Predictors", "14"),
    ("    2.7  Intraoperative Predictors", "16"),
    ("    2.8  Scoring Systems and Predictive Models", "17"),
    ("    2.9  Outcomes Following Conversion", "19"),
    ("    2.10 Gaps in Existing Literature", "20"),
    ("References", "22"),
]
for item, page in toc_items:
    p = doc.add_paragraph(style="Normal")
    p.paragraph_format.line_spacing = Pt(22)
    p.paragraph_format.space_after  = Pt(2)
    run = p.add_run(item)
    run.font.name = "Times New Roman"
    run.font.size = Pt(12)
    # tab stop for page number
    p.add_run("\t" + page).font.name = "Times New Roman"

doc.add_page_break()

# ═══════════════════════════════════════════════════════════════════════════════
# CHAPTER 1: INTRODUCTION
# ═══════════════════════════════════════════════════════════════════════════════
add_heading("CHAPTER 1", level=1, center=True)
add_heading("INTRODUCTION", level=1, center=True)
doc.add_paragraph()

add_subheading("1.1  Background and Significance")
add_para(
    "Acute appendicitis is the most frequent surgical emergency encountered in general surgical practice worldwide. "
    "It is estimated that approximately 6 to 7 percent of the general population will experience acute appendicitis "
    "at some point during their lifetime, with the peak incidence occurring in the second decade of life.1 In the United States "
    "alone, more than 300,000 hospitalizations per year are attributable to acute appendicitis, making appendectomy "
    "the most commonly performed urgent or emergent abdominal operation.1 In India and other low- and middle-income countries, "
    "the burden is comparably large, with acute appendicitis constituting a significant proportion of all emergency "
    "laparotomies performed at district and tertiary care hospitals."
)
add_para(
    "Historically, open appendectomy (OA) via a right iliac fossa (Gridiron or McBurney) incision was the unchallenged "
    "standard of care for acute appendicitis from the time Charles McBurney first described it in 1894. This approach "
    "remained dominant for nearly a century until Kurt Semm performed the first laparoscopic appendectomy in 1983, "
    "fundamentally changing the surgical landscape.2 Over the subsequent four decades, laparoscopic appendectomy (LA) "
    "has progressively supplanted open surgery as the preferred modality in most high-volume surgical centers globally, "
    "driven by well-documented advantages including reduced postoperative pain, shorter hospital stay, earlier return to "
    "daily activities, lower wound infection rates, and superior cosmesis.3,4"
)
add_para(
    "Despite these advances, LA is not uniformly feasible. In a proportion of patients, the laparoscopic approach must "
    "be abandoned intraoperatively in favor of an open technique - a process known as conversion. Conversion from "
    "laparoscopic to open appendectomy (CLOA) represents a clinical event of considerable importance: it is associated "
    "with increased operative time, greater intraoperative blood loss, higher postoperative morbidity, prolonged "
    "hospital stay, and elevated healthcare costs.5,6 Unlike elective laparoscopic procedures such as cholecystectomy, "
    "where conversion rates and predictors have been extensively studied, comparatively fewer prospective data exist "
    "specifically focused on conversion during appendectomy for acute appendicitis."
)

add_subheading("1.2  Magnitude of the Problem")
add_para(
    "Published conversion rates from LA to OA vary considerably across institutions and study populations. "
    "A 2025 systematic review and meta-analysis by Mirdamadi et al., encompassing 45 studies with a combined sample "
    "size of over 3.2 million patients, reported an overall pooled conversion rate of 8.7% (95% CI: 7.7%, 9.8%).7 "
    "Single-center retrospective cohort studies have reported rates ranging from as low as 2% to as high as 19%, "
    "reflecting the influence of institutional laparoscopic volume, case mix, and severity of disease.5,8,9 "
    "Notably, a 15-year analysis by Monrabal Lezama et al. (2022) demonstrated a significant declining trend in "
    "conversion rates over time (2% at their center), suggesting that increasing surgical expertise and improved "
    "patient selection have progressively reduced CLOA.5"
)
add_para(
    "Despite this improving trend, conversion remains a reality in daily surgical practice, particularly in settings "
    "where advanced laparoscopic training is limited, and in patient populations that are inherently at higher risk "
    "due to comorbidities, delayed presentation, or disease complexity. In resource-constrained settings such as "
    "those encountered across many Indian tertiary hospitals, where emergency laparoscopy is performed around the "
    "clock by surgeons of varying expertise, the conversion rate may be substantially higher than figures reported "
    "from dedicated laparoscopic centers. Prospective documentation of conversion and its determinants is therefore "
    "of direct clinical and administrative relevance in such settings."
)

add_subheading("1.3  Rationale of the Study")
add_para(
    "The decision to convert from laparoscopic to open appendectomy is, in most instances, made intraoperatively "
    "based on the surgeon's assessment of local conditions - severity of peritoneal contamination, degree of "
    "appendiceal inflammation, adhesion burden, and anatomical difficulty. However, several preoperative variables "
    "have been identified in retrospective analyses as independent risk factors for conversion, including advanced "
    "age, male sex, obesity, a high American Society of Anesthesiologists (ASA) physical status score, a prolonged "
    "duration of symptoms, elevated inflammatory markers (C-reactive protein, white blood cell count, "
    "neutrophil-to-lymphocyte ratio), imaging findings of periappendiceal fluid or abscess, a larger appendiceal "
    "diameter on computed tomography (CT), and the presence of a complicated appendicitis (perforation, gangrene, "
    "or appendiceal mass).7,8,9,10,11"
)
add_para(
    "Most existing evidence is derived from retrospective cohort studies and database analyses, which are inherently "
    "limited by selection bias, incomplete data capture, and inability to systematically record intraoperative "
    "findings. There is a paucity of prospective observational data, particularly from South Asian surgical "
    "settings, where the epidemiology of acute appendicitis, operative volume, and surgical training infrastructure "
    "differ substantially from high-income countries. A prospective design uniquely allows for standardized and "
    "systematic collection of preoperative, intraoperative, and postoperative variables, enabling robust "
    "multivariable analysis and reducing the confounding inherent in retrospective studies."
)
add_para(
    "Identification of reliable and early preoperative predictors of conversion would allow surgeons to counsel "
    "patients more accurately, prepare for a potentially difficult operation, allocate surgical expertise "
    "appropriately, and - in selected cases - consider open surgery as the primary approach. This information would "
    "also be valuable in designing institutional laparoscopic training frameworks and setting benchmarks for "
    "acceptable conversion rates."
)

add_subheading("1.4  Aims and Objectives")
p = doc.add_paragraph(style="Normal")
p.paragraph_format.left_indent    = Inches(0.3)
p.paragraph_format.line_spacing   = Pt(24)
p.paragraph_format.space_after    = Pt(6)
r = p.add_run("Primary Objective:")
r.font.name = "Times New Roman"; r.font.size = Pt(12); r.font.bold = True
p.add_run(" To identify preoperative clinical, biochemical, and radiological predictors of "
          "intraoperative conversion from laparoscopic to open appendectomy in adult patients "
          "presenting with acute appendicitis.").font.name = "Times New Roman"

p2 = doc.add_paragraph(style="Normal")
p2.paragraph_format.left_indent  = Inches(0.3)
p2.paragraph_format.line_spacing = Pt(24)
p2.paragraph_format.space_after  = Pt(6)
r2 = p2.add_run("Secondary Objectives:")
r2.font.name = "Times New Roman"; r2.font.size = Pt(12); r2.font.bold = True

secondary_objectives = [
    "1. To determine the overall intraoperative conversion rate at the study center.",
    "2. To describe and compare the demographic, clinical, laboratory, and imaging profiles of patients "
       "who undergo successful laparoscopic appendectomy versus those requiring conversion to open surgery.",
    "3. To evaluate intraoperative findings (degree of inflammation, perforation, peritonitis, adhesions) "
       "as predictors of conversion.",
    "4. To assess postoperative outcomes (operative time, length of hospital stay, wound infection, "
       "reoperation, mortality) in converted versus non-converted patients.",
    "5. To construct a multivariate logistic regression model identifying independent predictors of "
       "conversion and calculate their odds ratios with 95% confidence intervals.",
]
for obj in secondary_objectives:
    p_obj = doc.add_paragraph(style="Normal")
    p_obj.paragraph_format.left_indent    = Inches(0.5)
    p_obj.paragraph_format.line_spacing   = Pt(22)
    p_obj.paragraph_format.space_after    = Pt(4)
    run = p_obj.add_run(obj)
    run.font.name = "Times New Roman"
    run.font.size = Pt(12)

doc.add_page_break()

# ═══════════════════════════════════════════════════════════════════════════════
# CHAPTER 2: REVIEW OF LITERATURE
# ═══════════════════════════════════════════════════════════════════════════════
add_heading("CHAPTER 2", level=1, center=True)
add_heading("REVIEW OF LITERATURE", level=1, center=True)
doc.add_paragraph()

add_subheading("2.1  Historical Perspective")
add_para(
    "The history of appendectomy spans more than a century and mirrors the evolution of surgery as a discipline. "
    "Reginald Fitz first described the clinical syndrome of appendicitis in 1886, establishing that inflammation "
    "of the vermiform appendix was the cause of 'typhlitis' and advocating early surgical intervention. "
    "Charles McBurney subsequently described the muscle-splitting right iliac fossa incision in 1894, an approach "
    "that remained the definitive treatment for acute appendicitis for nearly 90 years.2 Open appendectomy through "
    "the McBurney (gridiron) or Lanz incision, later supplemented by the paramedian approach in complicated cases, "
    "was universally taught and practiced as the gold standard."
)
add_para(
    "The paradigm shifted in 1983 when Kurt Semm, a German gynecologist, performed the first laparoscopic "
    "appendectomy. His initial report was met with skepticism, and the technique was not immediately adopted by "
    "general surgeons. It was not until the late 1980s and early 1990s, coinciding with the rapid proliferation "
    "of laparoscopic cholecystectomy, that laparoscopic appendectomy gained wider acceptance. The first large "
    "prospective randomized controlled trial comparing laparoscopic versus open appendectomy was published in 1995 "
    "by Ortega et al., who demonstrated that laparoscopic appendectomy was associated with significantly less "
    "postoperative pain and a shorter hospital stay, establishing its non-inferiority in safety.12 Subsequent "
    "meta-analyses, including the landmark analysis by Golub et al. in 1998, confirmed the superiority of "
    "laparoscopic appendectomy over open surgery in multiple outcome parameters.13"
)

add_subheading("2.2  Laparoscopic Appendectomy: Techniques and Advantages")
add_para(
    "The standard laparoscopic appendectomy is performed under general anesthesia using a three-port technique: "
    "a 10-12 mm umbilical port for the camera, and two additional 5 mm working ports typically placed in the "
    "suprapubic region and left iliac fossa or right upper quadrant. A pneumoperitoneum of 12-15 mmHg is "
    "established using carbon dioxide. The appendix is identified at the convergence of the taeniae coli on "
    "the cecum. The mesoappendix is divided using electrocautery, a harmonic scalpel, or an endo-stapler, "
    "and the appendix is ligated at its base using endoloops or a laparoscopic stapler before being extracted "
    "via the umbilical port, typically within an endo-bag to minimize port-site contamination.1,3"
)
add_para(
    "The clinical advantages of laparoscopic appendectomy over the open technique have been conclusively "
    "established. Multiple randomized controlled trials and meta-analyses have demonstrated that LA is associated "
    "with significantly reduced postoperative pain scores and analgesic requirements, a shorter mean length of "
    "hospital stay (by approximately 0.9-1.1 days), faster return to normal daily activities and work, a "
    "substantially lower rate of wound infection (approximately 50% reduction), and a lower incidence of "
    "incisional hernia.3,4,13 Additional benefits include the ability to perform a thorough laparoscopic "
    "abdominal survey, which is particularly valuable in women of reproductive age where the differential "
    "diagnosis includes pelvic pathology, and in cases where the diagnosis of appendicitis is uncertain. "
    "The Sabiston Textbook of Surgery notes that laparoscopic appendectomy is now considered the preferred "
    "approach at most centers for both uncomplicated and complicated appendicitis when laparoscopic "
    "expertise is available.1"
)
add_para(
    "However, LA also carries specific disadvantages and limitations. It requires general anesthesia and "
    "establishment of pneumoperitoneum, which carry physiological consequences - particularly in elderly "
    "patients or those with cardiovascular disease, where elevated intra-abdominal pressure may precipitate "
    "hemodynamic instability. The operative cost is generally higher due to disposable instrumentation. "
    "It demands a degree of surgical skill and institutional infrastructure that may not be universally "
    "available, particularly in lower-resource settings. Furthermore, in the presence of severe peritoneal "
    "contamination, dense adhesions, or anatomical distortion from complicated appendicitis, the technical "
    "difficulty of laparoscopic dissection may exceed what is safely accomplishable, necessitating conversion "
    "to an open approach."
)

add_subheading("2.3  Incidence and Rates of Conversion")
add_para(
    "The reported incidence of conversion from laparoscopic to open appendectomy varies widely in the literature, "
    "reflecting heterogeneity in study design, patient population, institutional laparoscopic volume, and the "
    "definition of 'conversion' employed. The most definitive recent evidence comes from the 2025 systematic "
    "review and meta-analysis by Mirdamadi et al. (PMID: 40422077), which analyzed 45 studies comprising "
    "3,202,336 patients and reported a pooled conversion rate of 8.7% (95% CI: 7.7-9.8%).7 This figure is "
    "consistent with earlier meta-analyses and large database studies."
)
add_para(
    "Single-center cohort studies provide a range of rates depending on era and expertise. Monrabal Lezama "
    "et al. (2022), reporting a 15-year experience of 2,193 adult patients, observed a conversion rate of "
    "only 2%, with a statistically significant declining trend over the 15-year period (p=0.006), indicating "
    "that institutional learning curves and accumulated laparoscopic experience substantially reduce "
    "conversion.5 In contrast, Azili et al. (2023), studying 634 adults in a Turkish training hospital, "
    "observed a conversion rate of 19.2%, substantially higher and likely reflecting a less-selected "
    "emergency surgical patient population.9"
)
add_para(
    "A retrospective single-center analysis by Bancke Laverde et al. (2023) at the University Hospital "
    "Erlangen reported a 5.5% conversion rate among 1,220 adult patients over a decade.8 Similarly, "
    "Pushpanathan et al. (2022) in a Malaysian cohort identified a conversion rate of approximately 5-7%, "
    "with complicated appendicitis and longer symptom duration as key drivers.14 The variation across "
    "these studies underscores the need for prospective, institution-specific data on conversion predictors "
    "rather than relying solely on external benchmarks derived from high-volume Western centers."
)

add_subheading("2.4  Patient-Related (Demographic) Predictors")
add_para(
    "Several patient-level demographic characteristics have been consistently identified as significant "
    "independent predictors of conversion in large multi-study analyses."
)

add_para(
    "Age: Advanced age is one of the most robustly reported predictors of conversion. The 2025 meta-analysis "
    "by Mirdamadi et al. confirmed older age as a significant predictor across 45 included studies.7 "
    "Azili et al. (2023) reported that the average age of converted patients was significantly higher than "
    "those who completed the laparoscopic procedure (48.5 years vs. 37.8 years, p<0.001). Strikingly, the "
    "conversion rate for patients aged over 65 years was 63.8%, compared to 15.6% for patients under 65 "
    "(p<0.001).9 This likely reflects the higher prevalence of complicated appendicitis in the elderly "
    "due to delayed presentation, attenuated immune response, and the masking of classic symptoms by "
    "comorbidities."
)
add_para(
    "Sex: Male sex has been reported as an independent predictor of conversion in multiple studies and "
    "confirmed in the Mirdamadi et al. meta-analysis.7 This observation may be explained by the "
    "anatomical differences between male and female pelvises, which provide less working space in males, "
    "and the higher proportion of complicated appendicitis observed in male patients, possibly due to "
    "delayed healthcare-seeking behavior."
)
add_para(
    "Obesity: Obesity, defined by a body mass index (BMI) >30 kg/m2, is a well-established independent "
    "risk factor for conversion. Monrabal Lezama et al. (2022) identified obesity as an independent "
    "predictor on multivariate analysis (p<0.001).5 The Mirdamadi et al. meta-analysis also confirmed "
    "obesity as a significant predictor.7 Increased retroperitoneal and mesenteric fat creates limited "
    "working space, impairs visualization of the appendix, and increases the technical challenge of "
    "trocar placement and dissection."
)
add_para(
    "Comorbidities and ASA Score: The presence of significant systemic comorbidities, particularly "
    "diabetes mellitus, hypertension, and cardiovascular disease, was confirmed as a predictor of "
    "conversion in the 2025 meta-analysis.7 Azili et al. (2023) found that an ASA score greater "
    "than 2 was present in 52.5% of converted patients versus only 7.8% of laparoscopic patients "
    "(p<0.001), and remained a significant independent predictor on multivariate analysis.9 "
    "High ASA scores reflect impaired physiological reserve and the presence of comorbidities that "
    "increase both the technical difficulty and the risk of laparoscopic surgery."
)
add_para(
    "Previous Abdominal Surgery: A history of prior abdominal or pelvic operations is an important "
    "predictor of conversion, as these can cause adhesions that obscure the anatomy, limit "
    "laparoscopic visualization, and increase the risk of inadvertent enterotomy. Monrabal Lezama "
    "et al. (2022) confirmed previous abdominal operations as an independent predictor on multivariate "
    "analysis (p=0.013).5 The 2025 meta-analysis also confirmed this association.7"
)

add_subheading("2.5  Clinical and Laboratory Predictors")
add_para(
    "A number of clinical and laboratory variables available at the time of initial patient assessment "
    "have been studied as potential preoperative predictors of conversion."
)
add_para(
    "Duration of Symptoms: Prolonged symptom duration prior to surgery is consistently identified as "
    "a predictor of conversion. Prolonged inflammation increases the risk of gangrenous or perforated "
    "appendicitis, periappendiceal abscess, and dense inflammatory adhesions that significantly "
    "complicate laparoscopic dissection. The 2025 meta-analysis confirmed prolonged symptom duration "
    "as a significant preoperative predictor.7 Patients with symptoms lasting more than 48-72 hours "
    "are at substantially higher risk of complicated appendicitis and, consequently, conversion."
)
add_para(
    "Alvarado Score: The Alvarado scoring system, incorporating migration of pain, anorexia, nausea "
    "and/or vomiting, right iliac fossa tenderness, rebound tenderness, elevated temperature, "
    "leukocytosis, and shift to the left of the white blood cell differential, was originally designed "
    "as a diagnostic tool for appendicitis. However, several studies have investigated its utility "
    "as a predictor of conversion. Turhan et al. (2023) found that a high Alvarado score was an "
    "independent predictor of conversion on multivariable analysis.10 Azili et al. (2023) observed "
    "that while a high Alvarado score (>6) was more common in the laparoscopic group, the score "
    "distribution differed significantly between groups, suggesting its potential utility in "
    "preoperative risk stratification.9 A higher Alvarado score likely correlates with more advanced "
    "inflammation, consistent with its association with conversion."
)
add_para(
    "White Blood Cell Count and Neutrophil-to-Lymphocyte Ratio: Elevation of the white blood cell "
    "(WBC) count is present in approximately 90% of cases of acute appendicitis.1 Bancke Laverde "
    "et al. (2023) identified a higher preoperative WBC count as an independent predictor of "
    "conversion (OR 1.9, p=0.042) on multivariate analysis.8 Yigit et al. (2021) demonstrated "
    "that the neutrophil count and neutrophil-to-lymphocyte ratio (NLR) were significantly higher "
    "in patients who required conversion (p=0.027 and p=0.02, respectively), identifying NLR as "
    "a potentially useful simple blood-based biomarker for conversion risk.11"
)
add_para(
    "C-Reactive Protein (CRP): Elevated serum CRP, reflecting the systemic inflammatory response to "
    "infection and tissue damage, has been consistently identified as a predictor of complicated "
    "appendicitis and conversion risk. Bancke Laverde et al. (2023) identified elevated CRP as an "
    "independent predictor of conversion (OR 2.3, p=0.019) - the strongest preoperative predictor "
    "in their cohort.8 Yigit et al. (2021) similarly demonstrated significantly higher CRP levels "
    "in the conversion group (p=0.001).11 CRP elevation likely serves as a proxy for the systemic "
    "inflammatory response associated with advanced or complicated appendicitis, where local "
    "conditions are more likely to mandate conversion."
)
add_para(
    "Elevated Bilirubin: Azili et al. (2023) identified elevated serum bilirubin as a significant "
    "predictor of conversion, present in 36.1% of converted patients versus 13.5% of laparoscopic "
    "patients (p<0.001).9 While the mechanism is not entirely clear, hyperbilirubinemia in "
    "acute appendicitis has been described as a marker of gangrenous appendicitis, possibly "
    "reflecting bacterial translocation and systemic sepsis."
)

add_subheading("2.6  Imaging Predictors")
add_para(
    "Preoperative imaging - primarily ultrasonography (US) and computed tomography (CT) - provides "
    "crucial information about the appendix and surrounding structures. Beyond their diagnostic "
    "utility, specific imaging findings have emerged as predictors of conversion."
)
add_para(
    "Computed Tomography Findings: CT scan of the abdomen and pelvis with intravenous contrast is "
    "the most definitive preoperative imaging modality for assessing the degree of appendiceal "
    "inflammation and identifying complicated disease. The 2025 meta-analysis confirmed that a "
    "larger appendiceal diameter and the presence of intra-abdominal fluid on imaging were "
    "significant predictors of conversion.7 Turhan et al. (2023) demonstrated on multivariable "
    "analysis that periappendiceal fluid and lymphadenopathy on CT were independent predictors "
    "of conversion, along with leukocyte count and Alvarado score.10 The finding of an appendicolith, "
    "periappendiceal fat stranding, abscess formation, or extraluminal gas are additional CT "
    "features associated with complicated appendicitis and higher conversion risk."
)
add_para(
    "Ultrasonography Findings: While US is less sensitive than CT for appendicitis diagnosis, "
    "particularly in obese patients, it is widely used as the first-line imaging modality in "
    "many centers due to its availability and lack of radiation exposure. Yigit et al. (2021) "
    "specifically evaluated preoperative US findings as predictors of conversion and identified "
    "free fluid collection on ultrasonography as the single most significant imaging predictor "
    "of conversion (p=0.001), with an odds ratio that remained significant on multivariable "
    "analysis.11 The presence of periappendiceal fluid by US likely indicates more advanced "
    "perforation or abscess formation."
)
add_para(
    "Appendiceal Diameter: Appendiceal wall thickness and luminal diameter on both US and CT "
    "correlate with the severity of inflammation. An appendiceal diameter greater than 10 mm "
    "is generally considered diagnostic of appendicitis on US. In the context of conversion "
    "prediction, larger appendiceal diameter serves as a marker for more advanced inflammation "
    "and has been confirmed as a significant predictor in the 2025 meta-analysis.7"
)

add_subheading("2.7  Intraoperative Predictors")
add_para(
    "While preoperative factors inform the risk of conversion, the ultimate decision to convert "
    "is made intraoperatively based on the surgeon's direct assessment of the operative field. "
    "Several intraoperative findings have been consistently identified as drivers of conversion."
)
add_para(
    "Complicated Appendicitis (Perforation, Gangrene, Necrosis): The presence of gangrenous or "
    "perforated appendicitis is the most powerful intraoperative predictor of conversion. "
    "Fischer's Mastery of Surgery defines complicated appendicitis as encompassing gangrenous "
    "or perforated appendicitis and those with abscess or complex inflammatory changes; in the "
    "acutely ill patient with shock, clinical deterioration may occur with establishment of "
    "pneumoperitoneum during laparoscopy.15 Bancke Laverde et al. (2023) confirmed intraoperative "
    "perforation (OR 3.2, p=0.001), necrosis or gangrene (OR 2.3, p=0.023), perityphlitic "
    "abscess (OR 2.6, p=0.006), and peritonitis (OR 2.0, p=0.025) as independent intraoperative "
    "predictors of conversion.8 Monrabal Lezama et al. (2022) similarly identified peritonitis "
    "and complicated appendicitis as independent predictors (p=0.003 and p<0.001 respectively).5"
)
add_para(
    "Peritonitis and Intraperitoneal Contamination: Generalized peritonitis with purulent or "
    "feculent contamination of the peritoneal cavity creates conditions in which adequate "
    "laparoscopic washout may be difficult, visibility is impaired, and the risk of iatrogenic "
    "injury is high. Such conditions frequently mandate conversion to allow thorough open "
    "exploration and irrigation. The Sabiston Textbook emphasizes that patients presenting "
    "with generalized peritonitis may require emergent operative intervention, noting that "
    "in the acutely ill patient with shock, clinical deterioration may occur with "
    "pneumoperitoneum establishment.1"
)
add_para(
    "Dense Adhesions and Distorted Anatomy: Adhesions from previous abdominal surgery or "
    "from the peri-appendiceal inflammatory process itself can obliterate tissue planes, "
    "making safe laparoscopic dissection impossible. When the appendix is buried within "
    "an inflammatory mass (phlegmon), conversion to an open approach - or, in selected cases, "
    "abandonment of appendectomy in favor of conservative management - may be the safest option."
)
add_para(
    "Bleeding and Technical Difficulty: Uncontrolled hemorrhage from the mesoappendix or "
    "aberrant vessels in an inflamed field, inability to secure a safe appendiceal stump, "
    "or difficulty in trocar placement due to obesity are additional intraoperative triggers "
    "for conversion. Stump appendicitis has been reported to occur more frequently when "
    "there is difficulty in identifying the appendiceal base at laparoscopy, highlighting "
    "the critical importance of confident identification of the appendiceal base before "
    "transection.1"
)

add_subheading("2.8  Scoring Systems and Predictive Models")
add_para(
    "Given the clinical importance of predicting conversion, several investigators have attempted "
    "to develop composite scoring systems or regression models that integrate multiple predictors "
    "into a single risk score."
)
add_para(
    "Alvarado Score: Originally described in 1986 for diagnostic scoring of appendicitis, the "
    "Alvarado score has been secondarily evaluated as a conversion risk tool. Turhan et al. (2023) "
    "found it to be an independent predictor of conversion on multivariate analysis.10 However, "
    "its primary design for diagnosis rather than conversion risk limits its specificity for "
    "this application."
)
add_para(
    "Multivariate Logistic Regression Models: Several recent studies have developed and internally "
    "validated multivariable logistic regression models for conversion prediction. Turhan et al. "
    "(2023) constructed a model incorporating leukocyte count, Alvarado score, and CT findings "
    "(periappendiceal fluid, lymphadenopathy), demonstrating good discriminative ability.10 "
    "Bancke Laverde et al. (2023) identified CRP, WBC count, and intraoperative findings as "
    "the key independent variables.8 Azili et al. (2023) demonstrated that a model "
    "incorporating age, ASA score, bilirubin level, and CT utilization showed significant "
    "predictive power.9"
)
add_para(
    "Preoperative Risk Stratification Tools: The ideal preoperative scoring system for conversion "
    "risk would incorporate readily available clinical, laboratory, and imaging variables "
    "into a validated, generalizable tool that clinicians could apply at the time of "
    "surgical consent. No universally adopted tool yet exists for this specific purpose, "
    "representing a clear gap in the literature that prospective studies such as the present "
    "one are positioned to address. The 2025 meta-analysis by Mirdamadi et al. explicitly "
    "calls for prospective, high-quality studies to validate risk stratification tools for "
    "conversion prediction.7"
)

add_subheading("2.9  Outcomes Following Conversion")
add_para(
    "Conversion from laparoscopic to open appendectomy is consistently associated with worse "
    "postoperative outcomes compared to both planned open appendectomy and completed laparoscopic "
    "appendectomy. This 'conversion penalty' is well documented across multiple studies."
)
add_para(
    "Postoperative Morbidity: Monrabal Lezama et al. (2022) reported an overall morbidity rate "
    "of 48.0% in converted patients versus 14.9% in laparoscopic patients (p<0.0001).5 "
    "Bancke Laverde et al. (2023) identified conversion as independently associated with "
    "higher morbidity on multivariate analysis (OR 2.2, p=0.043).8 Azili et al. (2023) "
    "reported significantly higher rates of surgical site infection (8.2% vs. 2.7%, p=0.004), "
    "reoperation (13.1% vs. 0%, p<0.001), hospital re-admission (14.7% vs. 2.3%, p<0.001), "
    "and mortality (1.6% vs. 0%, p=0.004) in converted patients.9"
)
add_para(
    "Hospital Length of Stay: Converted patients consistently have a prolonged length of "
    "hospital stay. Monrabal Lezama et al. (2022) reported a mean stay of 5 days in "
    "converted patients versus 1.7 days for laparoscopic patients.5 Azili et al. (2023) "
    "similarly observed significantly prolonged time to oral intake (31.6 vs. 9.9 hours, "
    "p<0.001) in the conversion group.9"
)
add_para(
    "Operative Time: Conversion is associated with significantly increased operative times, "
    "partly because the laparoscopic approach is attempted first and then abandoned, adding "
    "operative time before the open phase even begins. This increases anesthetic risk and "
    "contributes to the overall morbidity of the procedure."
)
add_para(
    "It is important to note that conversion per se may not entirely explain the poor outcomes "
    "in converted patients - the underlying severity of disease (complicated appendicitis, "
    "peritonitis) that necessitated conversion is itself a major contributor. Multivariate "
    "analysis adjusting for disease severity is therefore essential when interpreting "
    "outcome data in converted versus non-converted patients."
)

add_subheading("2.10  Gaps in Existing Literature and Justification for the Present Study")
add_para(
    "Despite the substantial volume of published literature on conversion from laparoscopic to "
    "open appendectomy, several important gaps justify the current prospective observational study."
)
add_para(
    "First, the overwhelming majority of published studies are retrospective in design, with "
    "the inherent limitations of incomplete data capture, recall bias, and inability to "
    "systematically document intraoperative findings. The 2025 meta-analysis by Mirdamadi "
    "et al. explicitly acknowledged that 'the majority were retrospective, and the quality "
    "of evidence for many risk factors was moderate to low.'7 Prospective data collection "
    "allows for systematic and complete documentation of all relevant preoperative, "
    "intraoperative, and postoperative variables."
)
add_para(
    "Second, most published studies originate from high-income countries (USA, Europe, "
    "Australia) or from high-volume specialized laparoscopic centers. Data from South Asian "
    "settings - where patient demographics, nutritional status, delay in presentation, "
    "disease severity at the time of surgery, and the level of laparoscopic training are "
    "substantially different - are sparse. Conversion predictors identified in Western "
    "populations may not be directly applicable to Indian patient populations, where "
    "delayed presentation, higher rates of complicated appendicitis, and limited access "
    "to CT imaging may alter the predictive landscape."
)
add_para(
    "Third, no universally validated, prospectively derived composite scoring tool exists "
    "for preoperative prediction of conversion in acute appendicitis. A prospective study "
    "that collects standardized data across a sufficient patient volume would be uniquely "
    "positioned to construct and internally validate such a tool."
)
add_para(
    "Fourth, the impact of surgeon experience and institutional laparoscopic volume on "
    "conversion rates and predictors has not been adequately studied prospectively. A "
    "prospective observational design allows for concurrent documentation of operator-level "
    "variables (training level, seniority, number of prior laparoscopic appendectomies) "
    "as potential covariates."
)
add_para(
    "The present study - a prospective observational design conducted at a tertiary care "
    "surgical center - aims to address these gaps by systematically collecting and analyzing "
    "preoperative, intraoperative, and postoperative data in a consecutive series of adult "
    "patients undergoing laparoscopic appendectomy for acute appendicitis, with the "
    "primary goal of identifying independent preoperative and intraoperative predictors "
    "of conversion to open surgery."
)

doc.add_page_break()

# ═══════════════════════════════════════════════════════════════════════════════
# REFERENCES
# ═══════════════════════════════════════════════════════════════════════════════
add_heading("REFERENCES", level=1, center=False)
doc.add_paragraph()

refs = [
    ("1", "Sabiston DC, Townsend CM. Sabiston Textbook of Surgery: The Biological Basis of Modern Surgical Practice. 21st ed. Philadelphia: Elsevier; 2022. Chapter 94: The Appendix."),
    ("2", "Semm K. Endoscopic appendectomy. Endoscopy. 1983;15(2):59-64."),
    ("3", "Ingraham AM, Cohen ME, Bilimoria KY, et al. Comparison of outcomes after laparoscopic versus open appendectomy for acute appendicitis at 222 ACS NSQIP hospitals. Surgery. 2010;148(4):625-635."),
    ("4", "Sauerland S, Jaschinski T, Neugebauer EA. Laparoscopic versus open surgery for suspected appendicitis. Cochrane Database Syst Rev. 2018;11(11):CD001546."),
    ("5", "Monrabal Lezama M, Casas MA, Angeramo CA, Bras Harriott C, Schlottmann F. Conversion from laparoscopic to open appendectomy: trends, risk factors and outcomes. A 15-year single-center analysis of 2193 adult patients. World J Surg. 2022;46(10):2433-2441. doi:10.1007/s00268-022-06670-2. [PMID: 35871658]"),
    ("6", "Fingerhut A, Millat B, Borrie F. Laparoscopic versus open appendectomy: time to decide. World J Surg. 1999;23(8):835-845. [PMID: 10415210]"),
    ("7", "Mirdamadi A, Javid M, Amini-Salehi E, et al. Preoperative risk factors for laparoscopic to open appendectomy conversion: a systematic review and meta-analysis. Int J Surg. 2025. doi:10.1097/JS9.0000000000002485. [PMID: 40422077]"),
    ("8", "Bancke Laverde BL, Maak M, Langheinrich M, et al. Risk factors for conversion from laparoscopic to open appendectomy. J Clin Med. 2023;12(13):4299. doi:10.3390/jcm12134299. [PMID: 37445334]"),
    ("9", "Azili C, Tokgoz S, Chousein B, et al. Determination of risk factors for conversion from laparoscopic to open appendectomy in patients with acute appendicitis. Ulus Travma Acil Cerrahi Derg. 2023;29(10):1131-1138. doi:10.14744/tjtes.2023.94955. [PMID: 37791447]"),
    ("10", "Turhan N, Duran C, Kuzan TY, et al. Risk of conversion from laparoscopic appendectomy to open surgery: the role of clinical and radiological factors in prediction. J Laparoendosc Adv Surg Tech A. 2023;33(11):1045-1051. doi:10.1089/lap.2023.0293. [PMID: 37768845]"),
    ("11", "Yigit B, Cerekci E, Cakir Y, Citgez B. Efficacy of preoperative imaging features and blood tests in predicting the increased risk of conversion in laparoscopic appendectomy surgery. Cureus. 2021;13(8):e17092. doi:10.7759/cureus.17092. [PMID: 34527479]"),
    ("12", "Ortega AE, Hunter JG, Peters JH, et al. A prospective, randomized comparison of laparoscopic appendectomy with open appendectomy. Am J Surg. 1995;169(2):208-213. [PMID: 7840381]"),
    ("13", "Golub R, Siddiqui F, Pohl D. Laparoscopic versus open appendectomy: a metaanalysis. J Am Coll Surg. 1998;186(5):545-553. [PMID: 9583695]"),
    ("14", "Pushpanathan NR, Hashim MNM, Zahari Z. Conversion rate and risk factors of conversion to open in laparoscopic appendicectomy. Ann Coloproctol. 2022;38(5):367-372. doi:10.3393/ac.2020.00437.0062. [PMID: 34407370]"),
    ("15", "Fischer JE, Jones DB, Pomposelli FB, Upchurch GR. Fischer's Mastery of Surgery. 8th ed. Philadelphia: Wolters Kluwer; 2023. Chapter on Complicated Appendicitis."),
    ("16", "Schwartz SI, Brunicardi FC, Andersen DK, et al. Schwartz's Principles of Surgery. 11th ed. New York: McGraw-Hill Education; 2019. Chapter on Appendix."),
    ("17", "Cherif M, Mesbahi M, Zaafouri H, et al. Laparoscopic appendicectomy: risk factors for conversion to laparotomy. ABCD Arq Bras Cir Dig. 2023;36:e1737. doi:10.1590/0102-672020230019e1737. [PMID: 37283393]"),
    ("18", "Salminen P, Tuominen R, Paajanen H, et al. Five-year follow-up of antibiotic therapy for uncomplicated acute appendicitis in the APPAC randomized clinical trial. JAMA. 2018;320(12):1259-1265."),
    ("19", "Ceylan C, Elbistan I, Barut B. Risk factors for conversion from laparoscopic appendectomy to open appendectomy: a retrospective analysis of single-center experience. Ulus Travma Acil Cerrahi Derg. 2025. doi:10.14744/tjtes.2025.36423. [PMID: 40211638]"),
    ("20", "Maingot R, Zinner MJ, Ashley SW. Maingot's Abdominal Operations. 13th ed. New York: McGraw-Hill; 2019."),
]

for num, text in refs:
    add_ref(num, text)

# Save
out_path = "/tmp/workspace/thesis-appendectomy/Thesis_Laparoscopic_Conversion_Appendectomy.docx"
doc.save(out_path)
print(f"Saved: {out_path}")