Multi-messenger observations of a binary neutron star merger

On 2017 August 17 a binary neutron star coalescence candidate (later designated GW170817) with merger time 12:41:04 UTC was observed through gravitational waves by the Advanced LIGO and Advanced Virgo detectors. The Fermi Gamma-ray Burst Monitor independently detected a gamma-ray burst (GRB 170817A) with a time delay of ~1.7 s with respect to the merger time. From the gravitational-wave signal, the source was initially localized to a sky region of 31 deg2 at a luminosity distance of 40+8-8 Mpc and with component masses consistent with neutron stars. The component masses were later measured to be in the range 0.86 to 2.26 Mo. An extensive observing campaign was launched across the electromagnetic spectrum leading to the discovery of a bright optical transient (SSS17a, now with the IAU identification of AT 2017gfo) in NGC 4993 (at ~40 Mpc) less than 11 hours after the merger by the One- Meter, Two Hemisphere (1M2H) team using the 1 m Swope Telescope. The optical transient was independently detected by multiple teams within an hour. Subsequent observations targeted the object and its environment. Early ultraviolet observations revealed a blue transient that faded within 48 hours. Optical and infrared observations showed a redward evolution over ~10 days. Following early non-detections, X-ray and radio emission were discovered at the transient’s position ~9 and ~16 days, respectively, after the merger. Both the X-ray and radio emission likely arise from a physical process that is distinct from the one that generates the UV/optical/near-infrared emission. No ultra-high-energy gamma-rays and no neutrino candidates consistent with the source were found in follow-up searches. These observations support the hypothesis that GW170817 was produced by the merger of two neutron stars in NGC4993 followed by a short gamma-ray burst (GRB 170817A) and a kilonova/macronova powered by the radioactive decay of r-process nuclei synthesized in the ejecta

Hidatidosis of the spleen.

UNLABELLED: Hydatidosis of the spleen (SH) is an extremally rare condition. The aim of the study was to present our experience and discuss diagnostic methods and therapeutical options in cases of spleen hydatidosis. MATERIAL AND METHODS: Between 1993 and 2008, 8 patients were diagnosed with SH, 6 of whom were operated on (4 males and 2 females). Their average age was 44.5 years (the age range 30-59 years). Four patients presented isolated SH, one had a spleen and liver hydatidosis and there was also a case of one spleen, liver and peritoneal hydatidosis. RESULTS: The main symptom of the condition was abdominal pain and hydatidosis serology was always positive. The average hydatidisis cyst size was 13.3 cm (range: 7-18 cm). Splenectomy was performed in 5 cases and a partial cystectomy in one case. A left lateral sectionectomy was required in 1 case, a segment III subsegmentectomy was delivered in 1 case and multiple cystectomies in the case of the patient with disseminated hydatisis. In the follow-up period of the above mentioned surgical procedures no mortality among the treated patients was reported. The majority of patients did not present any symptoms of morbidity (4 patients). We registered one wound infection and one cavity abscess solved with percutaneous drainage in the patient following partial cystectomy. The hospitalisation period avaraged to 5 days (within the range of 5 to 12 days). The patients' follow-up was 98 months on average (range: 19-190 months) without any traced relapse. CONCLUSIONS: Total splenectomy is the treatment of choice of SH. Other surgical techniques could be employed in special cases

Early laparoscopic cholecystectomy in oldest-old patients: a propensity score matched analysis of a nationwide registry

The role of early laparoscopic cholecystectomy (ELC) in “oldest-old” patients with acute calculous cholecystitis (ACC) is still controversial. The aim of this study is to assess the safety of ELC for ACC in ≥ 85-year-old patients. Multicentric retrospective study that analysed data of patients who underwent ELC for ACC between 2013 and 2018. Patients ≥ 85-year-old (oldest-old patients) were compared with younger patients, before and after propensity score matching (PSM). The main outcomes were mortality, post-operative complications, length of stay (LOS), and readmissions. The study included 1670 patients. The unmatched comparison revealed a selection bias towards the oldest-old group, which was associated with higher Charlson Comorbidity Index (5 vs 1, p < 0.001), more ASA III/IV subjects (54.2% vs 19.3%, p < 0.001), class II/III ACC (80.1% vs 69.1%, p = 0.016) and higher Chole-Risk Score (p > 0.001). The oldest-old also required more conversion to open surgery (20% vs 10.3%, p = 0.005). Postoperatively, they had a higher 90-day mortality rate (7.6% vs 1%, p < 0.001), more total complications (40.6% vs 17.7%, p < 0.001), complications ≥ IIIa Clavien–Dindo (14.4% vs 5.8%, p = 0.002), longer LOS (6 vs 5 days, p < 0.001), and more readmissions (6.6% vs 2.6%, p < 0.001). After PSM (n = 206), the two groups were comparable in terms of baseline characteristics and intraoperative outcomes. No differences were observed in post-operative complications; bile leak; incisional, intrabdominal, urinary or respiratory tract infections; LOS or readmissions. In the oldest-old, ELC for ACC is still associated with significant morbidity and mortality. However, it seems to be safe in selected patients. Therefore, age itself should not be regarded as a contraindication to ELC for ACC