Intern Ready: Ob/Gyn
Headed into the OR for your first hysteroscopy? In this episode, we walk through everything you need to know before you scrub in — from indications and pre-op preparation to OR equipment, distension media, fluid deficit management, and how to handle complications when they arise. I. Introduction & Learning Goals Purpose: Guidance for an intern's first hysteroscopy in the OR. Objectives: Review indications, pre-op preparation, OR setup/equipment, fluid media, and complications. II. Indications for Hysteroscopy Diagnostic Hysteroscopy: * Abnormal uterine bleeding (AUB) or postmenopausal bleeding * Infertility workup * Evaluation of abnormal imaging findings Operative Hysteroscopy: * Polypectomy (removal of polyps) * Myomectomy (removal of submucosal fibroids) * Septum resection * Lysis of adhesions (Asherman syndrome) * Foreign body removal (e.g., "lost" IUD) III. Pre-Operative Preparation Chart Review Checklist: * Indication: Understand the clinical reason for the procedure * Imaging (US/MRI): Confirm uterine size (to avoid over-dilating) and location of pathology * Comorbidities: Check cardiac, renal, and pulmonary history to set fluid management thresholds * Cervical History: Assess risk for stenosis (prior procedures or menopause) * Menstrual Cycle: Check current phase (bleeding can obscure visualization) Patient Counseling (Benefits & Risks): * Benefits: Superior diagnostic sampling and therapeutic symptom relief * Standard Risks: Pain, bleeding, infection (low risk) * Specific Risks: Uterine perforation (may require laparoscopy if energy was used or if there is concern for bowel injury) IV. Equipment & OR Setup The Hysteroscope Components: * Telescope: The lens (0-degree for forward viewing vs. 30-degree for lateral angles) * Sheaths: Inner and outer sheaths to house the telescope and allow fluid flow * Inflow/Outflow Ports: For fluid delivery and drainage (use under-the-butt drapes to catch fluid for deficit calculation) * Light Source: Warning — becomes extremely hot; keep away from drapes/patient * Camera System & Monitor * Working Channel: For operative instruments (graspers, scissors) V. Distension Media (Fluids) Isotonic Solutions (Preferred): * Normal Saline: Compatible with bipolar electrosurgery; same osmolality as blood Hypotonic Solutions: * Glycine (1.5%), Sorbitol (3%), Mannitol (5%) * Used only for monopolar surgery; higher risk of hyponatremia Fluid Deficit Management: * Definition: The difference between fluid into the uterus vs. fluid recovered * ACOG Threshold: Max 2,500 mL for isotonic; however, many surgeons stop at 1,500 mL (or 750–1,000 mL for high-risk patients) VI. Procedural Steps & Tips * Cervical Dilation: Can use mechanical dilators or "hydrodilation" using fluid pressure through the scope * Tenaculum Tip: Take a "sturdy bite" of the cervix to prevent tearing/lacerations * Pressure Management: Keep intrauterine pressure lower than the patient's Mean Arterial Pressure (MAP) to limit fluid extravasation into the body VII. Complications * Uterine Perforation: Often occurs during dilation; recognized by a "loss of resistance" * Fluid Overload: Can lead to hyponatremia, distributive shock, or flash pulmonary edema * Hemorrhage: More common in operative cases (3% for myomectomy); manage with massage, uterotonics, or intrauterine balloons * Vasovagal Reaction: Can occur during cervical manipulation or distension * Gas Embolism: Rare; more common with older CO₂ distension methods Resources: * ACOG Technology Assessment: Hysteroscopy [https://www.acog.org/clinical/clinical-guidance/technology-assessment/articles/2018/09/hysteroscopy] * UpToDate: Hysteroscopy – Managing Fluid and Gas Distending Media [https://www.uptodate.com/contents/hysteroscopy-managing-fluid-and-gas-distending-media] * AAGL – Advancing Minimally Invasive Gynecology Worldwide [https://www.aagl.org/] About the Speakers: Host: Lucy Brown, MD, MPH – Resident physician at Johns Hopkins GYN/OB. Dr. Brown is passionate about medical and resident education and will be pursuing a Fellowship in Complex Family Planning after residency. Guest Speaker: Mahima Krishnamoorthi, MD – Gyn/Ob resident at Johns Hopkins Hospital. She attended Stanford University for undergrad and graduated from the Johns Hopkins School of Medicine. Intern Ready: Ob/Gyn is a podcast aimed at interns and off-service residents beginning their post-graduate training in Obstetrics and Gynecology. The views expressed are the speakers' own and do not constitute medical advice.
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