Falk Symposium, , , Portorož. Physiology of Swallowing and Anti-Gastroesophageal. Reflux-Mechanisms. Mechanisms: C.
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1 Falk Symposium, , , Portorož Physiology of Swallowing and Anti-Gastroesophageal Reflux-Mechanisms Mechanisms: Anything new from a radiologist s view? C.Kulinna-Cosentini Cosentini Medical University of Vienna Department of Radiology Christiane.Kulinna-Cosentini@meduniwien.ac.at Cosentini@meduniwien.ac.at
2 Normal Swallowing is a fundamental function for living and joy
3 Swallowing A Symphony of coordinated voluntary and involuntary activities, sending oral contents to stomach Cerebrum Brainstem 5 cranial nerves 50 muscles Salivary glands Oral cavity Pharynx Esophagus... Bild Orchester
4 1. Physiology of swallowing 2. Physiologic anti-reflux-mechanisms 3. NEW: Future aspects of dynamic MRI
5 4 Phases Oral preparation phase Oral phase Pharyngeal phase max.1s Esophageal phase max. 10s
6 7 Function Units 1. Oral cavity 2. Soft palate 3. Epiglottis 4. Hyoid/Larynx 5. Pharyngeal constrictors 6. PE-segment 7. Esophagus mm m 7. 5.
7 Oral Phase Oral cavity sealed by tongue/soft palate Soft palate Bolus loaded onto tongue Bolus propelled posteriorly by the tongue Elevation of soft palate Mandible Tongue Vocal cord
8 Pharyngeal Phase Elevation of soft palate: nasopharynx sealed Elevation/anterior movement of hyoid & larynx Contraction of pharyngeal constrictors Opening of PE-Sphincter
9 Esophageal Phase Propulsive contractions Opening/closure of the lower esophageal sphincter (LES)
10
11 1. Physiology of swallowing 2. Physiologic anti-reflux-mechanisms 3. NEW: Future aspects of dynamic MRI
12 Influence on Antireflux Mechanism Lower esophageal sphincter (LES) Crural diaphragm Phrenoesophageal ligament Angle of His Esophageal peristalsis Saliva
13 Angle of His Angle of His Hiatus hernia Lower esophageal sphincter (LES) Crural diaphragm Phrenoesophageal ligament Angle of His Esophageal peristalsis Saliva
14 Lower Esophageal Sphincter Intrinsic muscle of distal esoph/prox stomach 4cm long, 2cm intraabdominal Functional barrier without anatomic landmarks Manometrically distinct entity Pressure ~20 mmhg (GERD < 6mmHg) Flap valve mechanism Mittal RK: The esophagogastric junction. N Engl J Med 1997; 336: Boeckxstaens GE: The lower oesphageal sphincter. Neurogastroenterol Motil 2005;
15 LES GEJ is visible LES itself can NOT be seen NON-opening of LES is visible i.e. Achalasia Courtesy to P.Pokieser, W.Schima
16 Crural Diaphragm Sling around GEJ (external sphincter) Contracts during increased abdominal pressure (inspiration, coughing, straining) Mittal RK: Sphincteric action of the diaphragm during a relaxed lower esophageal sphincter in humans. Am J Physiol 1989; 256: Talwar V: Hiatus hernia and GERD. 2007
17 Crural Diaphragm Diaphragm can be detected well Sphincter - function can not be detected, only down/upwards movement
18 Phrenoesophageal Ligament Inserts circumferentially into esophageal musculature Formed by fused endothoracic and endoabdominal fascia Can not be seen in barium study Hill LD et al: The gastroesophageal flap valve. J Clin Gastroenterol 1999; 28:194-7
19 Angle of His Acute angle between axis of the esophagus and line between GEJ / top of fundus Flap valve function Less acute reflux Hill LD et al: The gastroesophageal flap valve. J Clin Gastroenterol 1999; 28:194-7
20 Peristalsis Esophageal acid clearance: Acid volume is emptied by peristaltic sequences Residual acid is neutralized by saliva Impaired esophageal peristalsis increases esophageal acid exposure Debate: abnormal peristalsis as primary abnormality or consequence of GERD? Domaine of manometry Moayyedi P: Gastroesophageal reflux disease. Lancet 2006; 367: Anggiansah A: Primary peristalsis is the major acid clearance mechanism in reflux patients. GUT 1994;
21 Courtesy to P.Pokieser Hiatal Hernia
22 Reflux Free reflux seen on barium esophagram is specific (>90%), but insensitive (<30%)! Thompson: Detection of gastroesophageal reflux: value of barium studies compared with 24-hr ph monitoring. AJR 1994; 162:621-6 Baker ME: GERD: intergrating the barium esophagram before and after antireflux surgery. Radiology 2007; 243:
23 Future Aspects 1. Physiology of swallowing 2. Physiologic anti-reflux-mechanisms 3. NEW: Future aspects of dynamic MRI?
24 Technique 1.5 T - 3 T Phased-array body coil Swallowing in supine position 1:40 Gadolinium : buttermilk Dyn. B-FFE/ True-FISP sequences: axial, coronal, sagittal TR 2.9, TE 1.5, Flip 60, matrix 256x256, 1-4 image/s
25 Position
26 Normal
27 Hernia with GERD M; 41y Heartburn, DeMeester Score 28
28 Disruption of Crural Sutures and Displacement of Wrap W; 56y St.p.lap.Nissen Fundoplication 2004 Presented with recurrent heartburn Gastroscopy: no pathology ph-metry: DeMeester score 22
29 Crural Sutures too tight M; 35y St.p.Nissen Fundoplication 2005 Dysphagia for 1 year Gastroscopy + Barium-esophagram: stenosis Question to MRI: Tumor?
30 Leiomyoma M; 34y; HIV Dysphagia
31 Conclusion Swallowing-MRI + Simple + Quick to perform (20 min) + Surrounding structures + No ionizing radiation repetition - Limited temporal resolution (1-4p/s) - Depiction entire esophagus - Expensive Problem solver
32 Take Home Message Swallowing: 7 function units Antireflux mechanism Barium esophagram: Reflux - no! Hernia - yes! Future: MRI? Today: Problem solver
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