Hammad Mahmood - Academia.edu (original) (raw)

Papers by Hammad Mahmood

Research paper thumbnail of Antibiotic Use Without a Prescription: A Multisite Survey of Patient, Health System, and Encounter Characteristics

Clinical Infectious Diseases

Background Using antibiotics without a prescription is potentially unsafe and may increase the ri... more Background Using antibiotics without a prescription is potentially unsafe and may increase the risk of antimicrobial resistance. We evaluated the effect of patient, health system, and clinical encounter factors on intention to use antibiotics without a prescription that were (1) purchased in the United States, (2) obtained from friends or relatives, (3) purchased abroad, or (4) from any of these sources. Methods The survey was performed January 2020–June 2021 in 6 publicly funded primary care clinics and 2 private emergency departments in Texas, United States. Participants included adult patients visiting 1 of the clinical settings. Nonprescription use was defined as use of antibiotics without a prescription; intended use was professed intention for future nonprescription antibiotic use. Results Of 564 survey respondents (33% Black and 47% Hispanic or Latino), 246 (43.6%) reported prior use of antibiotics without a prescription, and 177 (31.4%) reported intent to use antibiotics wit...

Research paper thumbnail of Iraqi state between national orientation and loyalty Britain 1958 -1921

Al-Anbar University Journal For Humanities

Research paper thumbnail of 1770. Effects of Acculturation and Social Norms on Intention to use Antibiotics without a Prescription among Hispanic or Latino individuals

Open Forum Infectious Diseases

Background The use of antibiotics obtained without a prescription (non-prescription use) in the U... more Background The use of antibiotics obtained without a prescription (non-prescription use) in the United States (U.S.) may contribute to antimicrobial resistance. We hypothesized that among Hispanic/Latino patients, the intention to use non-prescription antibiotics would be associated with: [1] lower acculturation (preference to socialize with Hispanic/Latinos) and [2] having friends or relatives who use antibiotics without contacting a doctor (social norms). Methods We conducted a survey on the factors that impact Hispanic/Latino patients’ decisions to use non-prescription antibiotics in safety-net primary care clinics and private emergency departments in the greater Houston, Texas area between January 2020 and June 2021. Surveys were read to patients in English or Spanish and queried patient, health system, and clinical encounter factors. Results Of 263 Hispanic/Latino patients, 59% completed the survey in Spanish and 41% in English (Table 1). Overall, 47% reported previous non-pres...

Research paper thumbnail of 140. Symptoms and Situations Predispose Patients to Use Antibiotics Without Medical Advice

Open Forum Infectious Diseases, 2020

Background Use of antibiotics without a prescription (non-prescription use) contributes to antimi... more Background Use of antibiotics without a prescription (non-prescription use) contributes to antimicrobial resistance. Non-prescription use includes obtaining and taking antibiotics without a prescription, taking another person’s antibiotics, or taking one’s own stored antibiotics. We conducted a quantitative survey focusing on the factors that impact patients’ decisions to use non-prescription antibiotics. Methods We surveyed patients visiting public safety net primary care clinics and private emergency departments in a racially/ethnically diverse urban area. Surveys were read aloud to patients in Spanish and English. Survey domains included patients’ perspectives on which syndromes require antibiotic treatment, their perceptions of health care, and their access to antibiotics without a prescription. Results We interviewed 190 patients, 122 from emergency departments (64%), and 68 from primary care clinics (36%). Overall, 44% reported non-prescription antibiotic use within the past 1...

Research paper thumbnail of Inhibitory effect of curcumin, a food spice from turmeric, on platelet-activating factor- and arachidonic acid-mediated platelet aggregation through inhibition of thromboxane formation and Ca2+ signaling

Biochemical Pharmacology, 1999

Curcumin, a dietary spice from turmeric, is known to be anti-inflammatory, anticarcinogenic, and ... more Curcumin, a dietary spice from turmeric, is known to be anti-inflammatory, anticarcinogenic, and antithrombotic. Here, we studied the mechanism of the antiplatelet action of curcumin. We show that curcumin inhibited platelet aggregation mediated by the platelet agonists epinephrine (200 microM), ADP (4 microM), platelet-activating factor (PAF; 800 nM), collagen (20 microg/mL), and arachidonic acid (AA: 0.75 mM). Curcumin preferentially inhibited PAF- and AA-induced aggregation (IC50; 25-20 microM), whereas much higher concentrations of curcumin were required to inhibit aggregation induced by other platelet agonists. Pretreatment of platelets with curcumin resulted in inhibition of platelet aggregation induced by calcium ionophore A-23187 (IC50; 100 microM), but curcumin up to 250 microM had no inhibitory effect on aggregation induced by the protein kinase C (PKC) activator phorbol myrsitate acetate (1 microM). Curcumin (100 microM) inhibited the A-23187-induced mobilization of intracellular Ca2+ as determined by using fura-2 acetoxymethyl ester. Curcumin also inhibited the formation of thromboxane A2 (TXA2) by platelets (IC50; 70 microM). These results suggest that the curcumin-mediated preferential inhibition of PAF- and AA-induced platelet aggregation involves inhibitory effects on TXA2 synthesis and Ca2+ signaling, but without the involvement of PKC.

Research paper thumbnail of Antibiotic Use Without a Prescription: A Multisite Survey of Patient, Health System, and Encounter Characteristics

Clinical Infectious Diseases

Background Using antibiotics without a prescription is potentially unsafe and may increase the ri... more Background Using antibiotics without a prescription is potentially unsafe and may increase the risk of antimicrobial resistance. We evaluated the effect of patient, health system, and clinical encounter factors on intention to use antibiotics without a prescription that were (1) purchased in the United States, (2) obtained from friends or relatives, (3) purchased abroad, or (4) from any of these sources. Methods The survey was performed January 2020–June 2021 in 6 publicly funded primary care clinics and 2 private emergency departments in Texas, United States. Participants included adult patients visiting 1 of the clinical settings. Nonprescription use was defined as use of antibiotics without a prescription; intended use was professed intention for future nonprescription antibiotic use. Results Of 564 survey respondents (33% Black and 47% Hispanic or Latino), 246 (43.6%) reported prior use of antibiotics without a prescription, and 177 (31.4%) reported intent to use antibiotics wit...

Research paper thumbnail of Iraqi state between national orientation and loyalty Britain 1958 -1921

Al-Anbar University Journal For Humanities

Research paper thumbnail of 1770. Effects of Acculturation and Social Norms on Intention to use Antibiotics without a Prescription among Hispanic or Latino individuals

Open Forum Infectious Diseases

Background The use of antibiotics obtained without a prescription (non-prescription use) in the U... more Background The use of antibiotics obtained without a prescription (non-prescription use) in the United States (U.S.) may contribute to antimicrobial resistance. We hypothesized that among Hispanic/Latino patients, the intention to use non-prescription antibiotics would be associated with: [1] lower acculturation (preference to socialize with Hispanic/Latinos) and [2] having friends or relatives who use antibiotics without contacting a doctor (social norms). Methods We conducted a survey on the factors that impact Hispanic/Latino patients’ decisions to use non-prescription antibiotics in safety-net primary care clinics and private emergency departments in the greater Houston, Texas area between January 2020 and June 2021. Surveys were read to patients in English or Spanish and queried patient, health system, and clinical encounter factors. Results Of 263 Hispanic/Latino patients, 59% completed the survey in Spanish and 41% in English (Table 1). Overall, 47% reported previous non-pres...

Research paper thumbnail of 140. Symptoms and Situations Predispose Patients to Use Antibiotics Without Medical Advice

Open Forum Infectious Diseases, 2020

Background Use of antibiotics without a prescription (non-prescription use) contributes to antimi... more Background Use of antibiotics without a prescription (non-prescription use) contributes to antimicrobial resistance. Non-prescription use includes obtaining and taking antibiotics without a prescription, taking another person’s antibiotics, or taking one’s own stored antibiotics. We conducted a quantitative survey focusing on the factors that impact patients’ decisions to use non-prescription antibiotics. Methods We surveyed patients visiting public safety net primary care clinics and private emergency departments in a racially/ethnically diverse urban area. Surveys were read aloud to patients in Spanish and English. Survey domains included patients’ perspectives on which syndromes require antibiotic treatment, their perceptions of health care, and their access to antibiotics without a prescription. Results We interviewed 190 patients, 122 from emergency departments (64%), and 68 from primary care clinics (36%). Overall, 44% reported non-prescription antibiotic use within the past 1...

Research paper thumbnail of Inhibitory effect of curcumin, a food spice from turmeric, on platelet-activating factor- and arachidonic acid-mediated platelet aggregation through inhibition of thromboxane formation and Ca2+ signaling

Biochemical Pharmacology, 1999

Curcumin, a dietary spice from turmeric, is known to be anti-inflammatory, anticarcinogenic, and ... more Curcumin, a dietary spice from turmeric, is known to be anti-inflammatory, anticarcinogenic, and antithrombotic. Here, we studied the mechanism of the antiplatelet action of curcumin. We show that curcumin inhibited platelet aggregation mediated by the platelet agonists epinephrine (200 microM), ADP (4 microM), platelet-activating factor (PAF; 800 nM), collagen (20 microg/mL), and arachidonic acid (AA: 0.75 mM). Curcumin preferentially inhibited PAF- and AA-induced aggregation (IC50; 25-20 microM), whereas much higher concentrations of curcumin were required to inhibit aggregation induced by other platelet agonists. Pretreatment of platelets with curcumin resulted in inhibition of platelet aggregation induced by calcium ionophore A-23187 (IC50; 100 microM), but curcumin up to 250 microM had no inhibitory effect on aggregation induced by the protein kinase C (PKC) activator phorbol myrsitate acetate (1 microM). Curcumin (100 microM) inhibited the A-23187-induced mobilization of intracellular Ca2+ as determined by using fura-2 acetoxymethyl ester. Curcumin also inhibited the formation of thromboxane A2 (TXA2) by platelets (IC50; 70 microM). These results suggest that the curcumin-mediated preferential inhibition of PAF- and AA-induced platelet aggregation involves inhibitory effects on TXA2 synthesis and Ca2+ signaling, but without the involvement of PKC.