Systematic review and meta-analysis: Efficacy and safety of POEM for achalasia.
BACKGROUND
Peroral endoscopic esophageal myotomy (POEM) represents a less invasive alternative, as compared with conventional laparoscopic Heller myotomy for treating achalasia patients. In the last years, a number of prospective and retrospective experiences with POEM use for achalasia have been published.


METHODS
Relevant publications in which patients affected by achalasia underwent POEM treatment were identified by PubMed databases for the period 2010 - 2013. From each study, we extracted the number and type of major complications (defined as those requiring any additional medical or surgical intervention). Data were pooled, using random-effects models. Heterogeneity among studies was assessed by using Cochran's Q and the I (2) statistic.


RESULTS
We found 16 studies that provided data on 551 patients. The median surveillance period was 6 months (range: 3-12). The median of mean POEM duration was 156 minutes (range: 42-112). Median myotomy length was 10 cm (range: 6-14). Technical and clinical success were reported in 97% (95% CI: 94-98%) and 93% (407/428; 95% CI: 90-95%). No heterogeneity (I (2 )= 0%) or publication bias was present in both estimates. When limiting the analysis only to adverse events that require medical or surgical interventions, major adverse events occurred in 14% (95% CI: 11-17%); however, only one patient needed post-POEM surgery (0.2%; 95% CI: 0-0.5%).


CONCLUSIONS
POEM appeared to be a highly feasible and effective endoscopic treatment for achalasia. Despite POEM being apparently associated with relatively high morbidity, most patients are successfully managed conservatively, so that POEM appears as a very safe procedure; however, POEM should only be performed in centers able to treat POEM complications, such as pneumothorax or pneumoperitoneum.
Endoscopy Unit and Department of Surgery, Istituto Clinico Humanitas, Milan, Italy.
Lavinia A
LA
Barbieri
Endoscopy Unit and Department of Surgery, Istituto Clinico Humanitas, Milan, Italy.
Cesare
C
Hassan
Endoscopy Unit and Department of Surgery, Istituto Clinico Humanitas, Milan, Italy.
Riccardo
R
Rosati
Endoscopy Unit and Department of Surgery, Istituto Clinico Humanitas, Milan, Italy.
Uberto Fumagalli
UF
Romario
Endoscopy Unit and Department of Surgery, Istituto Clinico Humanitas, Milan, Italy.
Loredana
L
Correale
Endoscopy Unit and Department of Surgery, Istituto Clinico Humanitas, Milan, Italy.
Alessandro
A
Repici
Achalasia; adverse events; complications; endoscopic esphageal myotomy; esophageal sphincter; esophagus; myotomy; peristalsis; review; safety; swallowing