Tx of Lung Fungus Flashcards

1
Q

How does candida albicans infection present?

A

fever, tachycardia, patchy infiltrates on chest film

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2
Q

Is candida albicans a common cause of pneumonia?

A

No, seen more in immunocompromised patients

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3
Q

How does cryptococcus neoformans infection present?

A

Often asymptomatic; may have productive cough, fever and weight loss

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4
Q

What is cryptococcus neoformans commonly associated with?

A

pigeon droppings

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5
Q

How does aspergillus (mold) infection present?

A

Wheezing, dyspnea and cough with allergic broncho-pulmonaryaspergillosis: fever, cough,dyspnea, pleuritic chest pain, and hemoptysis seen in invasive forms, usually in immuno-compromised patients

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6
Q

What is aspergillomas?

A

fungal ‘balls’ that can form in pre-existing cavities and can spread via blood

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7
Q

How does blastomyces dermatitidis infection present?

A

-fever, chills, productive cough and possibly skin or bone lesions

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8
Q

How is candida albicans treated?

A

ampho B IV and fluconazole

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9
Q

How is CNS cryptococcus neoformans treated?

A

Ampho B IV + flucytosine PO (because they are fungicidal)

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10
Q

How is non-CNS cryptococcus neoformans treated?

A

Fluconazole PO

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11
Q

How is aspergillus treated?

A

-Voriconazole IV Ampho BFor Aspergillus there is a move to employ one of the newer azole drugs, which areeffective against these species, rather than amphotericin B.

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12
Q

How is blastomyces dermatitidis treated?

A

Fluconazole IV or Ampho B IV if severe

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13
Q

How is Histoplasma capsulate treated in severe cases or immunocompromised cases?

A

Ampho B IV followed by Itra PO

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14
Q

How is mild Histoplasma capsulate treated?

A

Itra PO

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15
Q

How is Ampho B given?

A

Most physicians now employ lipid formulations of amphotericin B to try and avoid thenephrotoxicity associated with the deoxycholate form of the drugHYDRATION helps

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16
Q

Aspergillus is beginning to show resistance to what drug?

A

AZOLES, due to increased use to agriculture

17
Q

How is aspergillus evolving against AZOLES?

A

Mutations in the promotor region of CYP51A, whichencodes lanosterol-14a-sterol demethylase activity

18
Q

Note There is a trend towards moving away from itraconazole to the other newer azoledrugs. Why?

A

Oral absorption of itraconazole is low and variable from patient topatient.

19
Q

Which AZOLE can pass the BBB?

A

Fluconazole

20
Q

How are AZOLES metabolized?

A

hepatic CYP metabolism

21
Q

Possible DD interactions of AZOLES?

A

Concurrent drugsmetabolized via CYP2C9, 2C19 & 3A4.

22
Q

Which anti-fungal don’t undergo hepatic metabolism?

A

Ampho B or fluctyosine

23
Q

DD interactions of Ampho B?

A

Other nephrotoxic agents and with drugs producinghypokelmia.

24
Q

DD interactions of Flucytosine?

A

Other hematotoxic drugs because flucytosine can itself produce anemia, and blood dyscrasias, including agranulocytosis

25
Q

Which anti fungals are fungicidal?

A

-Ampho B-Alylamines (naftafine)-Echinocandins -Flucytosine

26
Q

Which anti fungals are fungistatic?

A

-AZOLES-Griseofulvin