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Respiratory particles generated by speech can remain airborne for up to 14 minutes

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Stadnytskyi and colleagues explored the size of droplets created by speech using a highly sensitive laser system. They reported in PNAS that speaking resulted in the generation of a high number of medium-sized droplets (10- to 100-µm in diameter). Under the conditions of their experiment (27% humidity and 23° C) they reported that speech probably generates droplets that originate at a size of 12 to 21 µm in diameter and quickly dehydrate to an estimated diameter of 4 µm. The 4 µm-sized particles had a falling rate of only 0.06 cm·s1 and remained airborne for 8 to 14 minutes.1

As reported by Hamner and colleagues, on March 10, 2020, 61 persons attended a 2.5-hour choir practice. One choir member had symptoms of an upper respiratory infection that began on March 7. Eventually that choir member tested positive for SARS-CoV-2. Of the 60 remaining persons, 52 (86.7%) eventually developed an upper respiratory illness. In total, 33 cases of SARS-CoV-2 were confirmed by nucleic acid testing and 20 probable cases were diagnosed (these individuals declined testing). The  choir attendees developed symptoms at a median of 3 days following the practice, with a range of 1 to 12 days. Three of the 53 ill people were hospitalized, and two died.2

The Stadnytskyi study suggests that speech generates large respiratory droplets that dehydrate into very small droplets that may remain in the air for an extended period of time. If the SARS-CoV-2 virus were in the original large droplet, the rapid dehydration of the droplet would result in prolonged airborne presence of the virus and enhance its infectivity.

The Hamner study highlights the importance of vocalization and respiratory particles in transmitting the SARS-CoV-2 virus. For clinicians and patients, both studies support many recommendations to reduce viral transmission, including:

  • all clinicians and patients need to wear face masks
  • all clinicians and patients should avoid face-to-face contact if alternative approaches to communication are possible
  • all clinicians and patients should avoid gathering in large groups or crowded public spaces and need to maintain physical distancing.

The COVID pandemic has dramatically changed how we practice medicine and socialize.

 

References
  1. Stadnytskyi V, Bax CE, Bax A, et al. The airborne lifetime of small speech droplets and their potential importance in SARS-CoV-2 transmission. PNAS. May 13, 2020. https://doi.org/10.1073/pnas.2006874117.
  2. Hamner L, Dubbel P, Capron I, et al. High SARS-CoV-2 attack rate following exposure at choir practice—Skagit County, Washington, March 2020. MMWR Morb Mortal Wkly Rep. 2020;69:606-610. Early release, May 12, 2020.
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Robert L. Barbieri, MD

Editor in Chief, OBG MANAGEMENT
Chair, Obstetrics and Gynecology
Brigham and Women’s Hospital
Boston, Massachusetts
Kate Macy Ladd Professor of Obstetrics,
Gynecology and Reproductive Biology
Harvard Medical School

Dr. Barbieri reports no financial relationships relevant to this article. 

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Robert L. Barbieri, MD

Editor in Chief, OBG MANAGEMENT
Chair, Obstetrics and Gynecology
Brigham and Women’s Hospital
Boston, Massachusetts
Kate Macy Ladd Professor of Obstetrics,
Gynecology and Reproductive Biology
Harvard Medical School

Dr. Barbieri reports no financial relationships relevant to this article. 

Author and Disclosure Information

Robert L. Barbieri, MD

Editor in Chief, OBG MANAGEMENT
Chair, Obstetrics and Gynecology
Brigham and Women’s Hospital
Boston, Massachusetts
Kate Macy Ladd Professor of Obstetrics,
Gynecology and Reproductive Biology
Harvard Medical School

Dr. Barbieri reports no financial relationships relevant to this article. 

Stadnytskyi and colleagues explored the size of droplets created by speech using a highly sensitive laser system. They reported in PNAS that speaking resulted in the generation of a high number of medium-sized droplets (10- to 100-µm in diameter). Under the conditions of their experiment (27% humidity and 23° C) they reported that speech probably generates droplets that originate at a size of 12 to 21 µm in diameter and quickly dehydrate to an estimated diameter of 4 µm. The 4 µm-sized particles had a falling rate of only 0.06 cm·s1 and remained airborne for 8 to 14 minutes.1

As reported by Hamner and colleagues, on March 10, 2020, 61 persons attended a 2.5-hour choir practice. One choir member had symptoms of an upper respiratory infection that began on March 7. Eventually that choir member tested positive for SARS-CoV-2. Of the 60 remaining persons, 52 (86.7%) eventually developed an upper respiratory illness. In total, 33 cases of SARS-CoV-2 were confirmed by nucleic acid testing and 20 probable cases were diagnosed (these individuals declined testing). The  choir attendees developed symptoms at a median of 3 days following the practice, with a range of 1 to 12 days. Three of the 53 ill people were hospitalized, and two died.2

The Stadnytskyi study suggests that speech generates large respiratory droplets that dehydrate into very small droplets that may remain in the air for an extended period of time. If the SARS-CoV-2 virus were in the original large droplet, the rapid dehydration of the droplet would result in prolonged airborne presence of the virus and enhance its infectivity.

The Hamner study highlights the importance of vocalization and respiratory particles in transmitting the SARS-CoV-2 virus. For clinicians and patients, both studies support many recommendations to reduce viral transmission, including:

  • all clinicians and patients need to wear face masks
  • all clinicians and patients should avoid face-to-face contact if alternative approaches to communication are possible
  • all clinicians and patients should avoid gathering in large groups or crowded public spaces and need to maintain physical distancing.

The COVID pandemic has dramatically changed how we practice medicine and socialize.

 

Stadnytskyi and colleagues explored the size of droplets created by speech using a highly sensitive laser system. They reported in PNAS that speaking resulted in the generation of a high number of medium-sized droplets (10- to 100-µm in diameter). Under the conditions of their experiment (27% humidity and 23° C) they reported that speech probably generates droplets that originate at a size of 12 to 21 µm in diameter and quickly dehydrate to an estimated diameter of 4 µm. The 4 µm-sized particles had a falling rate of only 0.06 cm·s1 and remained airborne for 8 to 14 minutes.1

As reported by Hamner and colleagues, on March 10, 2020, 61 persons attended a 2.5-hour choir practice. One choir member had symptoms of an upper respiratory infection that began on March 7. Eventually that choir member tested positive for SARS-CoV-2. Of the 60 remaining persons, 52 (86.7%) eventually developed an upper respiratory illness. In total, 33 cases of SARS-CoV-2 were confirmed by nucleic acid testing and 20 probable cases were diagnosed (these individuals declined testing). The  choir attendees developed symptoms at a median of 3 days following the practice, with a range of 1 to 12 days. Three of the 53 ill people were hospitalized, and two died.2

The Stadnytskyi study suggests that speech generates large respiratory droplets that dehydrate into very small droplets that may remain in the air for an extended period of time. If the SARS-CoV-2 virus were in the original large droplet, the rapid dehydration of the droplet would result in prolonged airborne presence of the virus and enhance its infectivity.

The Hamner study highlights the importance of vocalization and respiratory particles in transmitting the SARS-CoV-2 virus. For clinicians and patients, both studies support many recommendations to reduce viral transmission, including:

  • all clinicians and patients need to wear face masks
  • all clinicians and patients should avoid face-to-face contact if alternative approaches to communication are possible
  • all clinicians and patients should avoid gathering in large groups or crowded public spaces and need to maintain physical distancing.

The COVID pandemic has dramatically changed how we practice medicine and socialize.

 

References
  1. Stadnytskyi V, Bax CE, Bax A, et al. The airborne lifetime of small speech droplets and their potential importance in SARS-CoV-2 transmission. PNAS. May 13, 2020. https://doi.org/10.1073/pnas.2006874117.
  2. Hamner L, Dubbel P, Capron I, et al. High SARS-CoV-2 attack rate following exposure at choir practice—Skagit County, Washington, March 2020. MMWR Morb Mortal Wkly Rep. 2020;69:606-610. Early release, May 12, 2020.
References
  1. Stadnytskyi V, Bax CE, Bax A, et al. The airborne lifetime of small speech droplets and their potential importance in SARS-CoV-2 transmission. PNAS. May 13, 2020. https://doi.org/10.1073/pnas.2006874117.
  2. Hamner L, Dubbel P, Capron I, et al. High SARS-CoV-2 attack rate following exposure at choir practice—Skagit County, Washington, March 2020. MMWR Morb Mortal Wkly Rep. 2020;69:606-610. Early release, May 12, 2020.
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ACOG offers guidance on optimizing patient care in the midst of COVID-19

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Thu, 08/26/2021 - 16:16

The American College of Obstetricians and Gynecologists (ACOG) posted a useful resource on its website on March 30 for clinicians practicing ambulatory gynecology. The guidance, “COVID-19 FAQs for Obstetrician–Gynecologists, Gynecology” (https://www.acog.org/), is based on expert opinion and is intended to supplement guidance from the Centers for Disease Control and Prevention as well as previously issued ACOG guidance.1

Which patients need to be seen, and when

The ACOG guidance provides examples of patients needing in-person appointments, video or telephone visits, or for whom deferral of a visit until after the COVID-19 outbreak would be appropriate. Highlights include:

In-person appointments

  • suspected ectopic pregnancy
  • profuse vaginal bleeding

Video or telephone visits

  • contraceptive counseling and prescribing
  • management of menopausal symptoms

Deferral of a visit until after the COVID-19 outbreak

  • routine well-woman visits for average-risk patients.

Cervical screening

With respect to patients with abnormal cervical cancer screening results, ACOG recommends the ASCCP’s guidance that2:

  • for patients with low-grade test results, colposcopy/cervical biopsies be deferred up to 6 to 12 months
  • for patients with high-grade results, colposcopy/cervical biopsies be performed within 3 months.

Contraception

Regarding contraceptive services, the ACOG guidance suggests that placement of intrauterine devices (IUDs) and contraceptive implants should continue “where possible.” If initiation of long-acting reversible contraception (LARC) is not feasible, the guidance recommends that use of self-administered contraceptives (including subcutaneous injections, oral, transdermal patch, and vaginal ring contraception) be encouraged as a bridge to later initiation of LARC.

The guidance suggests that removal of IUDs and implants be postponed when possible.

Finally, the guidance suggests that patients with an existing IUD or implant who seek removal and replacement of their contraceptives be counseled regarding extended use of these devices.

Individualize your approach

ACOG emphasizes that no single solution applies to all situations and that each practice or clinic should evaluate the individual situation, including the availability of local and regional resources, staffing, and personal protective equipment; the prevalence of COVID-19 in the region; and the type of practice.

A roadmap for care

This guidance from ACOG should help clinicians caring for women during the COVID-19 outbreak to counsel and guide patients in a prudent manner.
 

References
  1. American College of Obstetricians and Gynecologists website. COVID-19 FAQs for obstetrician-gynecologists, gynecology. https://www.acog.org/clinical-information/physician-faqs/covid19-faqs-for-ob-gyns-gynecology. Accessed April 3, 2020.
  2. ASCCP website. ASCCP interim guidance for timing of diagnostic and treatment procedures for patients with abnormal cervical screening tests. https://www.asccp.org/covid-19. Accessed April 3, 2020.
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Dr. Kaunitz is University of Florida Term Professor and Associate Chairman, Department of Obstetrics and Gynecology, University of Florida College of Medicine–Jacksonville; Medical Director and Director of Menopause and Gynecologic Ultrasound Services, UF Women’s Health Specialists at Emerson, Jacksonville. Dr. Kaunitz serves on the OBG Management Board of Editors.

Dr. Kaunitz reports that he has received grant or research support from Medicines360 and that he is a consultant to Merck and Pfizer.

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Dr. Kaunitz is University of Florida Term Professor and Associate Chairman, Department of Obstetrics and Gynecology, University of Florida College of Medicine–Jacksonville; Medical Director and Director of Menopause and Gynecologic Ultrasound Services, UF Women’s Health Specialists at Emerson, Jacksonville. Dr. Kaunitz serves on the OBG Management Board of Editors.

Dr. Kaunitz reports that he has received grant or research support from Medicines360 and that he is a consultant to Merck and Pfizer.

Author and Disclosure Information

Dr. Kaunitz is University of Florida Term Professor and Associate Chairman, Department of Obstetrics and Gynecology, University of Florida College of Medicine–Jacksonville; Medical Director and Director of Menopause and Gynecologic Ultrasound Services, UF Women’s Health Specialists at Emerson, Jacksonville. Dr. Kaunitz serves on the OBG Management Board of Editors.

Dr. Kaunitz reports that he has received grant or research support from Medicines360 and that he is a consultant to Merck and Pfizer.

The American College of Obstetricians and Gynecologists (ACOG) posted a useful resource on its website on March 30 for clinicians practicing ambulatory gynecology. The guidance, “COVID-19 FAQs for Obstetrician–Gynecologists, Gynecology” (https://www.acog.org/), is based on expert opinion and is intended to supplement guidance from the Centers for Disease Control and Prevention as well as previously issued ACOG guidance.1

Which patients need to be seen, and when

The ACOG guidance provides examples of patients needing in-person appointments, video or telephone visits, or for whom deferral of a visit until after the COVID-19 outbreak would be appropriate. Highlights include:

In-person appointments

  • suspected ectopic pregnancy
  • profuse vaginal bleeding

Video or telephone visits

  • contraceptive counseling and prescribing
  • management of menopausal symptoms

Deferral of a visit until after the COVID-19 outbreak

  • routine well-woman visits for average-risk patients.

Cervical screening

With respect to patients with abnormal cervical cancer screening results, ACOG recommends the ASCCP’s guidance that2:

  • for patients with low-grade test results, colposcopy/cervical biopsies be deferred up to 6 to 12 months
  • for patients with high-grade results, colposcopy/cervical biopsies be performed within 3 months.

Contraception

Regarding contraceptive services, the ACOG guidance suggests that placement of intrauterine devices (IUDs) and contraceptive implants should continue “where possible.” If initiation of long-acting reversible contraception (LARC) is not feasible, the guidance recommends that use of self-administered contraceptives (including subcutaneous injections, oral, transdermal patch, and vaginal ring contraception) be encouraged as a bridge to later initiation of LARC.

The guidance suggests that removal of IUDs and implants be postponed when possible.

Finally, the guidance suggests that patients with an existing IUD or implant who seek removal and replacement of their contraceptives be counseled regarding extended use of these devices.

Individualize your approach

ACOG emphasizes that no single solution applies to all situations and that each practice or clinic should evaluate the individual situation, including the availability of local and regional resources, staffing, and personal protective equipment; the prevalence of COVID-19 in the region; and the type of practice.

A roadmap for care

This guidance from ACOG should help clinicians caring for women during the COVID-19 outbreak to counsel and guide patients in a prudent manner.
 

The American College of Obstetricians and Gynecologists (ACOG) posted a useful resource on its website on March 30 for clinicians practicing ambulatory gynecology. The guidance, “COVID-19 FAQs for Obstetrician–Gynecologists, Gynecology” (https://www.acog.org/), is based on expert opinion and is intended to supplement guidance from the Centers for Disease Control and Prevention as well as previously issued ACOG guidance.1

Which patients need to be seen, and when

The ACOG guidance provides examples of patients needing in-person appointments, video or telephone visits, or for whom deferral of a visit until after the COVID-19 outbreak would be appropriate. Highlights include:

In-person appointments

  • suspected ectopic pregnancy
  • profuse vaginal bleeding

Video or telephone visits

  • contraceptive counseling and prescribing
  • management of menopausal symptoms

Deferral of a visit until after the COVID-19 outbreak

  • routine well-woman visits for average-risk patients.

Cervical screening

With respect to patients with abnormal cervical cancer screening results, ACOG recommends the ASCCP’s guidance that2:

  • for patients with low-grade test results, colposcopy/cervical biopsies be deferred up to 6 to 12 months
  • for patients with high-grade results, colposcopy/cervical biopsies be performed within 3 months.

Contraception

Regarding contraceptive services, the ACOG guidance suggests that placement of intrauterine devices (IUDs) and contraceptive implants should continue “where possible.” If initiation of long-acting reversible contraception (LARC) is not feasible, the guidance recommends that use of self-administered contraceptives (including subcutaneous injections, oral, transdermal patch, and vaginal ring contraception) be encouraged as a bridge to later initiation of LARC.

The guidance suggests that removal of IUDs and implants be postponed when possible.

Finally, the guidance suggests that patients with an existing IUD or implant who seek removal and replacement of their contraceptives be counseled regarding extended use of these devices.

Individualize your approach

ACOG emphasizes that no single solution applies to all situations and that each practice or clinic should evaluate the individual situation, including the availability of local and regional resources, staffing, and personal protective equipment; the prevalence of COVID-19 in the region; and the type of practice.

A roadmap for care

This guidance from ACOG should help clinicians caring for women during the COVID-19 outbreak to counsel and guide patients in a prudent manner.
 

References
  1. American College of Obstetricians and Gynecologists website. COVID-19 FAQs for obstetrician-gynecologists, gynecology. https://www.acog.org/clinical-information/physician-faqs/covid19-faqs-for-ob-gyns-gynecology. Accessed April 3, 2020.
  2. ASCCP website. ASCCP interim guidance for timing of diagnostic and treatment procedures for patients with abnormal cervical screening tests. https://www.asccp.org/covid-19. Accessed April 3, 2020.
References
  1. American College of Obstetricians and Gynecologists website. COVID-19 FAQs for obstetrician-gynecologists, gynecology. https://www.acog.org/clinical-information/physician-faqs/covid19-faqs-for-ob-gyns-gynecology. Accessed April 3, 2020.
  2. ASCCP website. ASCCP interim guidance for timing of diagnostic and treatment procedures for patients with abnormal cervical screening tests. https://www.asccp.org/covid-19. Accessed April 3, 2020.
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