Bing Zhang

Indiana University-Purdue University Indianapolis, Indianapolis, Indiana, United States

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Publications (3)23.63 Total impact

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    ABSTRACT: The safety and efficacy of NaP tablets have not been compared with 2L PEG lavage solution. A multicenter, investigator-blinded study was conducted to compare the colon-cleansing efficacy of a new NaP tablet formulation with that of 2L PEG solution plus bisacodyl tablets in adults undergoing colonoscopy. A total of 481 patients were randomized to receive either 32 tablets (48 g) of NaP or 2L PEG solution plus 4 (20 mg) bisacodyl tablets. Quality of colon cleansing was assessed using a 4-point scale (1 = excellent, 2 = good, 3 = fair, and 4 = inadequate), and the primary efficacy end point was mean overall colon-cleansing score. Safety assessments included recording of adverse events and changes in biochemical tests and vital signs. A total of 411 patients were included in the efficacy analysis. The mean overall and ascending colon-cleansing scores for NaP tablets were significantly better than PEG plus bisacodyl (overall 1.5 vs 1.8, ascending 1.4 vs 1.8, P < 0.0001 for both). Patients treated with NaP tablets experienced significantly fewer adverse events (66%vs 82%, P= 0.0003) and gastrointestinal symptoms (64%vs 79%, P= 0.0001) compared with patients receiving PEG plus bisacodyl. Patients receiving NaP tablets were significantly less likely to experience abdominal distention, abdominal pain, and vomiting than patients receiving PEG plus bisacodyl (P < 0.0012). Transient fluctuations in laboratory parameters were observed in both treatment groups; however, the fluctuations were more common and of greater magnitude in the NaP group particularly in phosphorous, sodium, and potassium. The colon-cleansing efficacy of the new 32-tablet NaP dosing regimen in this study was found to be significantly better than the 2L PEG solution plus bisacodyl tablets regimen. The 32-tablet NaP dosing regimen was associated with fewer adverse events. As expected electrolyte shifts were more common and of greater magnitude in the NaP group compared with the PEG plus bisacodyl group; however, both treatment groups demonstrated significant changes in electrolytes and creatinine.
    The American Journal of Gastroenterology 11/2007; 102(10):2238-46. · 9.21 Impact Factor
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    ABSTRACT: The bowel purgative Visicol contains microcrystalline cellulose (MCC) residue, which may impair full visibility during a colonoscopy. An MCC residue-free sodium phosphate (RF-NaP; OsmoPrep) tablet was developed. To investigate appropriate RF-NaP dosing. Phase 2, randomized, investigator-blinded study. Six research centers in the United States. Patients undergoing a colonoscopy received Visicol (n = 34) or 1 of 6 RF-NaP regimens administered as either split (S) dosing (the evening before and the day of colonoscopy) or evening-only (E) dosing. Dosing regimens for RF-NaP were 40 tablets S, 3 every 15 minutes (n = 33); 40 tablets S, 4 every 15 minutes (n = 34); 32 tablets E, 4 every 15 minutes (n = 34); 32 tablets S, 4 every 15 minutes (n = 36); 28 tablets E, 4 every 15 minutes (n = 34); 28 tablets S, 4 every 15 minutes (n = 34). Visicol was administered as 40 tablets S, 3 every 15 minutes. Overall colon cleansing (OCC) was assessed by a physician questionnaire (4-point scale, based on colonic contents). An OCC rating of "excellent" or "good" was considered a response. Safety measures were also monitored. Split dosing with RF-NaP was associated with high OCC and achieved response rates of 90%, 97%, and 100% for 28, 32, and 40 tablets, respectively, compared with 86% for Visicol. In addition, RF-NaP evening-only regimen response rates were 90% (32 tablets) and 72% (28 tablets). Transient shifts in electrolyte levels were reduced, and GI adverse events were less common with lower RF-NaP dose regimens. Administration of RF-NaP retains the benefits of a tablet purgative but eliminates MCC issues. Split dosing and 32-tablet evening-only dosing of RF-NaP tablets were efficacious and well tolerated, and split dosing of RF-NaP tablets is recommended.
    Gastrointestinal Endoscopy 05/2007; 65(4):660-70. · 5.21 Impact Factor
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    ABSTRACT: A residue-free sodium phosphate tablet (RF-NaP) was formulated that lacks microcrystalline cellulose, which can appear as a whitish residue in the colon. A multicenter, randomized, investigator-blinded study was conducted to compare the colon-cleansing efficacy of 40 or 32 tablets of RF-NaP with the marketed 40-tablet NaP treatment regimen. Eight hundred sixteen patients were randomized prior to colonoscopy to receive either 40 tablets (60 g) of NaP or RF-NaP or 32 tablets (48 g) of RF-NaP. Colon cleansing was assessed using a 4-point scale based on retained "colonic contents." The primary end point was overall colon-cleansing response rate to treatment (score of excellent/good) versus nonresponse (fair/inadequate). Seven hundred four patients were included in the efficacy analysis. The overall colon-cleansing response rates were comparable among treatment arms (94.5%, 97.0%, and 95.3% for NaP, RF-NaP 40, and RF-NaP 32 tablets, respectively). Ascending colon-cleansing response rates for RF-NaP 40 (95.7%) and 32 tablets (93.6%) were significantly better than for NaP tablets (88.5%, p < 0.03 for both). Patients treated with RF-NaP 32 tablets experienced less pronounced changes in electrolyte levels and fewer adverse events (138/239, 58%) compared with patients receiving NaP (161/238, 68%, p= 0.07) and RF-NaP 40 tablets (156/236, 66%, p= 0.03). The most common adverse events reported were abdominal distention, nausea, abdominal pain, and vomiting. Based on the safety, efficacy, and patient preferences, the 32-tablet RF-NaP regimen was superior to the 40-tablet RF-NaP and NaP regimen for colon cleansing prior to colonoscopy.
    The American Journal of Gastroenterology 12/2006; 101(11):2594-604. · 9.21 Impact Factor