1,721,062 research outputs found
Nitinol basket-assisted pars plana vitrectomy for retained lens material removal
No full textPurposeTo evaluate the usefulness of different types of nitinol baskets to capture, lift and hold the lens material, dropped during a complicated phacoemulsification, as an adjunctive surgical tool in vitreoretinal surgery and to evaluate the outcomes and complication of this new surgical technique in a small series of patients. MethodsPatients who underwent pars plana vitrectomy (PPV) for retained lens fragments operated during December 2014 and March 2015 at the Academic Medical Center (AMC), Amsterdam, were included in this study. The PPV was performed using different settings and types of nitinol stone extractors (NSE). Three different stone extractors were used for the above-mentioned purpose. Preoperative (pre-op) and postoperative (post-op) data including best corrected visual acuity at 6months follow-up visit, intra- and postoperative complications were recorded. ResultsSeven eyes of seven patients with a follow-up of 6months were included in this study. All the vitrectomies were performed the same day of the complicated cataract extraction. Mean pre-op Snellen visual acuity was 20/160; mean post-op visual acuity was 20/32. No complications were encountered due to the use of the NSE intraocularly. No retinal breaks were observed due to traction of the catheter at the site of insertion or due to his movement in and out the vitreous cavity. ConclusionThe use of the nitinol lens cage seemed feasible and showed no complications in our small group of patients. It made easier the management of dropped nucleus without the need for a larger scleral opening also in case of very hard lens
Re: "Deep Anterior Lamellar Keratoplasty in Eyes With Intrastromal Corneal Ring Segments"
No full textxletter to edito
Ab interno intraluminal suture to reverse ocular hypotony after glaucoma drainage device implantation
No full textThis letter describes our experience in treating glaucoma valve induced ocular hypotony using a minimally invasive ab interno approac
A simple method to quantify the V̇O2 mean response time of ramp-incremental exercise
No full textDuring ramp-incremental exercise, the mean response time (MRT) of oxygen uptake (V ̇O2) represents the time delay for changes in muscle V ̇O2 to be reflected at the level of the mouth and is generally calculated by linear (MRTLIN) and monoexponential (τ') fitting of V ̇O2 data. However, these methods yield MRT values that are highly variable from test-to-test.
Purpose: Therefore, we examined the validity and the reproducibility of a novel method to calculate the MRT.
Methods: On two occasions, 12 healthy men (age, 30 ± 10 yr; V ̇O2max: 4.14 ± 0.47 L·min, 53.5 ± 7.3 mL·kg·min) performed a ramp-incremental cycling test (30 W·min) that was preceded by a step transition to 100 W. The ramp power output corresponding to the steady-state V ̇O2 at 100 W was determined and the difference between that power output and 100 W was converted to time to quantify the MRT (MRTSS).
Results: The values of MRTLIN, τ', and MRTSS were 28 ± 16 s, 27 ± 12 s, and 26 ± 11 s, respectively, which were not different (P > 0.05) from each other. However, compared to the MRT parameters derived from the fitting-based methods, MRTSS had a higher correlation coefficient (R = 0.87) and a smaller coefficient of variation (15% ± 9%) from test-to-test.
Conclusions: In conclusion, the novel method proposed in the current study was found to be valid and highly reproducible in a test-retest design. Therefore, we advocate the use of this approach when a precise and accurate determination of the MRT is needed to properly align the V ̇O2 data with power output during ramp-incremental exercise
Association between V̇O2max and the kinetics of V̇O2 in groups differing in fitness status
No full textPurpose This study evaluated (i) the relationship between oxygen uptake ( ̇VO2) kinetics and maximal ̇VO2 ( ̇VO2max) within groups differing in fitness status, and (ii) the adjustment of ̇VO2 kinetics compared to that of central [cardiac output (Q), heart rate (HR)] and peripheral (deoxyhemoglobin over ̇VO2 ratio ([HHb]/̇VO2)] O2 delivery, during step-transitions to moderate-intensity exercise. Methods Thirty-six young healthy male participants (18 untrained; 18 trained) performed a ramp-incremental test to exhaustion and 3 step-transitions to moderate-intensity exercise. Q and HR kinetics were measured in 18 participants (9 untrained; 9 trained). Results No significant correlation between τ̇VO2 and ̇VO2max was found in trained participants (r = 0.29; p > 0.05) whereas a significant negative correlation was found in untrained (r = − 0.58; p 0.05). τQ demonstrated a significant strong positive correlation with τHR in trained (r = 0.76; p 0.05). A significant overshoot in the [HHb]/̇VO2 ratio was found in the untrained groups (p 0.05) Conclusion The results indicated that when comparing participants of different fitness status (i) there is a point at which greater VO2max values are not accompanied by faster ̇VO2 kinetics; (ii) central delivery of O2 does not seem to limit the kinetics of ̇VO2; and (iii) O2 delivery within the active tissues might contribute to the slower ̇VO2 kinetics response in untrained participants
Shorter High-Intensity Cycling Intervals Reduce Performance and Perceived Fatigability at Work-Matched but not Task Failure
No full textRhegmatogenous retinal detachment: a review of current practice in diagnosis and management (vol 5, e000474, 2020)
No full textrepl
Ab interno intraluminal suture to reverse ocular hypotony after glaucoma drainage device implantation
No full textNo abstract availabl
Humoral factors contribute meaningfully to the hyperventilatory response above the respiratory compensation point
No full text- …
