Comparative Study of Low Pressure versus Standard Pressure Carbon Dioxide Pneumoperitoneum in Reducing Shoulder Tip Pain Post Laparoscopic Cholecystectomy

Introduction: Laparoscopic cholecystectomy is the gold standard treatment for cholelithiasis. Postoperative shoulder tip pain is common complaint. Evidences suggest that using low pressure pneumoperitoneum (8-10 mmHg) during the procedure rather than standard pressure (12-14 mmHg) decreases the incidence and severity of shoulder tip pain without compromising working space. Aims: The aim of this study was to evaluate the impact of low pressure and standard pressure pneumoperitoneum on shoulder tip pain post laparoscopic cholecystectomy. Methods: A prospective hospital based study conducted at Nepalgunj Medical College, Kohalpur from January 2019 to December 2020. Hundred patients were enrolled, fifty each in “low pressure carbondioxide pneumoperitoneum” and “standard pressure carbondioxide pneumoperitoneum” groups, who underwent laparoscopic cholecystectomy. The two groups were compared in terms of incidence and severity of shoulder tip pain, surgeon’s satisfaction score, top-up analgesia requirement, procedural time, conversion to standard pressure, intraoperative complications and length of hospital stay. Results: There were 45 (90%) females and five (10%) males in low pressure group and 44 (88%) females and six (12%) males in standard pressure group. Fourteen (28%) patients in low pressure and 32 (64%) patients in standard pressure group had shoulder tip pain (p=0.001). The severity of shoulder tip pain was less in low pressure group and was significant at eight hours (p=0.006) and 12 hours (p=0.008). Top-up analgesia was required more in standard pressure group. There were no intraoperative complications but only one conversion to standard pressure. Surgeon’s satisfaction score, conversion to open cholecystectomy and procedural time were comparable in both groups with shorter hospital stay in low pressure group. Conclusion: Low pressure carbondioxide pneumoperitoneum is safe and effective strategy in reducing incidence and severity of shoulder tip pain after laparoscopic cholecystectomy.

The Effects of Different Pressure Pneumoperitoneum on the Pulmonary Mechanics and Surgical Satisfaction in the Laparoscopic Cholecystectomy

Objectives. Inspiratory, hemodynamic and metabolic changes occur in laparoscopic surgery depending on pneumoperitoneum and patient position. This study aims to evaluate the effects of intra-abdominal pressure increase based on CO2 pneumoperitoneum in laparoscopic operations on hemodynamic parameters and respiratory dynamics and satisfaction of surgeon and operative view.Materials and Methods. A total of 116 consecutive, prospective, ASA class I–III cases aged 18–70 years undergoing laparoscopic cholecystectomy were enrolled in this study. Data of 104 patients were analysed. Patients were divided into two groups as the group Low Pressure (<12 mmHg) (Group LP) (n=53) and the group Standard Pressure (>13 mmHg) (Group SP) (n=51). In this study administration of general anesthesia used total intravenous anaesthesia in both groups. All groups had standard and TOF monitorization applied. The anaesthesia methods used in both groups were recorded. Before, during and after peritoneal insufflation, the peroperative ventilation parameters and hemodynamic parameters were recorded. The adequacy of pneumoperitoneum, gastric and the operative view were evaluated by the operating surgeon and recorded.Results. The peripheral oxygen saturation showed no significant difference between the low and standard pressure pneumoperitoneum in view of tidal volume, respiratory rate, end tidal CO2, mean and peak inspiratory pressure, and minute ventilation values. In terms of hemodynamics, when values just after intubation and before extubation were compared, it was observed that in the LP group systolic, diastolic and mean blood pressure values were higher. In terms of heart rate, no significant difference was observed in determined periods between groups. There was no significant difference between the groups in terms of surgical satisfaction and vision.Conclusion. Low pressure pneumoperitoneum provides effective respiratory mechanics and stable hemodynamics for laparoscopic cholecystectomy. It also provides the surgeon with sufficient space for hand manipulations. Anaesthetic method, TIVA and neuromuscular blockage provided good surgery vision with low pressure pneumoperitoneum.

A Comparative Study of Low Versus Standard Intraperitoneal Pressures in Gynaecological Laparoscopic Surgery

Background: Minimal access surgery in contrast to open surgery has quicker recovery during the postoperative period as well as reduced scores of pain. As a result of increased pressure in the abdominal cavity, laparoscopic surgery has many implications over a range of organ systems as well as their functioning. Laparoscopic surgery due to increased intraabdominal pressure also has many implications on various organ systems and their functioning. To overcome the consequences of increased intrabdominal pressure, a number of trials have been formulated to compare low- versus standard-pressure pneumoperitoneum. Aim: The aim of this study was to assess the effectivity of low intraperitoneal pressures v/s standard intraperitoneal pressure during laparoscopic hysterectomies. Study Design: Experimental study Materials and Methods: 40 cases with uncomplicated symptomatic benign uterine pathologies who were posted for laparoscopic hysterectomy were selected out of which 20-20 cases were randomized into low and standard pneumoperitoneum groups. Results: In patients in whom low pressure pneumoperitoneum is employed are better recovered in terms of pain than standard pressure pneumoperitoneum. This means hospital stay can be shortened in low pressure pneumoperitoneum groups which will be more economical and comfortable for patients. Conclusion: Laparoscopic hysterectomy can be done at 10 mmhg with the benefits of : Optimum visualization with low pressure Reduction in post operative pain helping the patient for early ambulation so that patient will get back to routine work and normal life earlier, it is the main purpose of minimal invasive surgery.

Pumping Rate and Size of Demosponges—Towards an Understanding Using Modeling

Filter-feeding sponges pump large amounts of water and contribute significantly to grazing impact, matter transport and nutrient cycling in many marine benthic communities. For ecological studies it is therefore of interest to be able to estimate the pumping rate of different species from their volume size or osculum cross-sectional area by means of experimentally determined allometric correlations. To help understand allometric data correlations and observed large variations of volume-specific pumping rate among species we developed a model that determines the pumping rate as a function of the size (volume) of a tubular-type demosponge described by 4 geometric length scales. The model relies on a choanocyte-pump model and standard pressure loss relations for flow through the aquiferous system, and density and pumping rate per choanocyte is assumed to be constant. By selecting different possibilities for increase of the length scales, which may also simulate different growth forms, we demonstrate that the model can imitate the experimental allometric correlations. It is concluded that the observed dependence of pumping rate on size is primarily governed by the hydraulics of pump performance and pressure losses of the aquiferous system rather than, e.g., decreasing density of choanocytes with increasing sponge size.

EVALUATION OF POSTOPERATIVE SHOULDER TIP PAIN IN LOW PRESSURE VERSUS STANDARD PRESSURE PNEUMOPERITONEUM DURING LAPAROSCOPIC CHOLECYSTECTOMY

Introduction:- Insufation of carbon dioxide during laparoscopic cholecystectomy carries on to postoperative shoulder tip pain. The beginning of shoulder pain is commonly presumed to be due to overstretching of the diaphragmatic muscle bres due to high carbon dioxide pressure. Methods: - Patients came and admitted to the surgery department for elective cholecystectomy were enrolled in the study. The patients were randomly divided in two groups (group A and group B). In group A - low-pressure pneumoperitoneum (8 mm Hg) and in group B- standard pressure pneumoperitoneum (14 mm Hg) was created during laparoscopic cholecystectomy. Postoperative shoulder tip pain was evaluated at 4 hours and 24 hours after the operation. Results:- Fourteen patients or 28 % of patients in group B complained of postoperative shoulder tip pain as collated to only ve patients (10%) in group A. The mean intensity of postoperative shoulder tip pain assessed by the visual analogue scoring scale at 4 hours and 24 hours was less in group A as collated to group B. However, statistical signicance was seen only at four hours. Analgesic requirements and the mean length of postoperative stay in the hospital were minor in group-A as collated to group B. Conclusion: - Low-pressure laparoscopic cholecystectomy signicantly reduces the frequency and intensity of postoperative shoulder tip pain. Low-pressure laparoscopic cholecystectomy decreases the demand for postoperative analgesics, decreases postoperative hospital stay, and improves the quality of life in the initial stage of postoperative rehabilitation.

A FOLLOW-UP STUDY - LOW-PRESSURE PNEUMOPERITONEUM COMPARED TO STANDARD PNEUMOPERITONEUM IN LAPAROSCOPIC CHOLECYSTECTOMY

Introduction-: Post-laparoscopic pain syndrome is well conceded and characterized by abdominal and especially shoulder tip pain. It occurs frequently following laparoscopic cholecystectomy. The etiology of post-laparoscopic pain can be classied into three aspects visceral, incision, and shoulder. This study purposed to compare the frequency and strength of shoulder tip pain between low pressure (7 mmHg) and standard pressure (14 mmHg) in a prospective randomized clinical test. Methods-: One hundred forty successive patients undergoing elective laparoscopic cholecystectomy were randomized prospectively to either low or high-pressure pneumoperitoneum. The statistical analysis included mean age, weight, sex, duration of surgery, conversion rate, American Society of Anesthesiologists (ASA) grade, operative time, incidence and severity of shoulder tip pain, and post-operative hospital stay. Results -: The patient's quality was similar in the two groups except for the predominance of males in the standard-pressure group. The plan of action was successful in 68 of 70 patients in the low-pressure group. The number of analgesic injections, visual analog score, operative time, and length of post-operative days were the same in all groups. Occurence of shoulder tip pain was higher in the standard-pressure group, but not statistically signicantly so (p = 0.100) (27.9% versus 44.3%). Conclusions -: Low-pressure pneumoperitoneum tended to be better than standard-pressure pneumoperitoneum in a period of lower incidence of shoulder tip pain. Still, this difference did not reach statistical signicance following elective laparoscopic cholecystectomy